JP3088959B2 - Method for manufacturing joint of 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 method for manufacturing a joint portion of a concrete segment which is assembled in a large number on the inner surface of a tunnel hole excavated to form a lining wall.

[0002]

2. Description of the Related Art In recent years, a tunnel in which a lining wall is constructed on the inner surface of an excavated tunnel hole by combining a large number of concrete segments formed in an arc plate shape into a cylindrical shape and joining adjacent ones together. Construction methods are becoming more common. In combining the segments into a cylindrical shape, for example, a plurality of segments A, B, and K shown in FIG.
Are joined in the axial direction.
As shown in FIG. 9, the segment A has a circular arc plate-like regular shape, and a plurality (three in this case) is joined on the lower side of the ring 50. Segment B is segment A at both ends
The joining end face to the segment A is straight along the width direction, while the other joining end face is formed obliquely. The segment K is trapezoidal and is disposed between the two segments B. Segment K is a ring 50
When assembling, it is inserted last in the direction of arrow S in FIG. As a result, the ring 50 can be assembled smoothly, and the joining end surface of the segment B with respect to the segment K is necessarily inclined.

The segments A, B, and K are joined at the joints at the ends in the circumferential direction. As a means for this, a joint fitting shown in FIG. 10 or FIG. 11 has been used. 10 and 11 show the inner surface side of the joint portion of the segment B.

The joint fitting 60 shown in FIG. 10 is buried in concrete 70 which forms the main part of the segment B, is made of a steel plate flush with the joint end face 71, and has a bolt insertion hole 61.
and a pair of brackets 62 made of the same steel plate welded to both sides of the inner surface of the joint plate 61. An anchor bar 73 is attached to the side surface of each bracket 62 to increase the bonding strength with the concrete 70. The surface direction of the bracket 62 extends along the circumferential direction of the segment B, and is welded obliquely to the joint plate 61. A bolt box 72 that exposes the inner surface of the joint plate 61 is recessed in the concrete 70. Then, the joint plate of the similar joint fitting 60A embedded in the joint portion of the segment K is fitted to the joint plate 61, and the bolt box 72 is inserted into the bolt insertion holes of the matched joint plates.
The segments B and K are joined by passing a bolt through the nut and fastening the bolt with a nut. The segments A, B, and K in FIG.
Joint fittings 60A, 60B, 6 having the same basic configuration as that of No. 0
It is joined at 0C.

The joint fitting 80 shown in FIG. 11 is formed by integrally forming a joint plate 81 and a bracket 82 with ductile cast iron. An anchor bar 73 is screwed to a female screw portion 82a formed on the bracket 82. I have. As shown in FIG. 12, a pair of upper and lower bolt insertion holes 81a is formed in the joint plate 81, and a grid-like rib 81b is formed on the inner surface side. FIG. 11 shows a state in which the segment B is being manufactured, and reference numeral 90 denotes a mold for forming the joint end face 71. The joint plate 81 is applied to the mold frame 90, and is fixed to the mold frame 90 and a reamer bolt 91 which is passed through the bolt insertion hole 81a and is screwed into a core (not shown) forming a bolt box 72. A core (not shown) that forms the bolt box 72 is installed in the formwork 90, and the concrete 70 is cast.

[0006]

However, in the above-mentioned joint fittings, a plurality of types (60A, 60B in FIG. 9) having joint plates corresponding to the joint end surfaces 71 of the segments B and K are provided. I had to prepare it.
Moreover, since the joining end surface of the segment A and the joining end surface of the segment B with respect to the segment A are straight in the width direction, a joint fitting (60C in FIG. 9) in which the joint plate and the bracket are orthogonal to each other is naturally required. Therefore, when assembling one ring 50, a plurality of types of joint fittings having different shapes according to the angle of the joint end face have to be manufactured, which has caused an increase in cost and complicated handling. Particularly, in the case of the latter joint fitting 80, the rib 8 is provided between the bolt box 72 and the joint plate 81.
Since there is a narrow space 83 surrounded by 1b, there is a drawback that the concrete 70 hardly penetrates into this space.

The present invention has been made in view of the above circumstances, and reduces the cost and simplifies the handling by making the shape of the joint fitting common regardless of the angle of the joint end face. It is an object of the present invention to provide a method for manufacturing a joint portion of a concrete segment that allows filling.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a method of manufacturing a joint portion of a concrete segment according to claim 1 is in the form of an arc plate.
Circumferential edge of formed concrete segment
Joint fittings buried in the
In front of the adjacent concrete segment in contact with
By connecting the joint plates of the joint fittings with bolts
Manufactures joints that join concrete segments
Method for manufacturing joints of concrete segments
The joint fitting inside the formwork forming the joint end face.
And set concrete in the formwork
In manufacturing the part, the contact to be formed
Clear the gap from the formwork with a spacer corresponding to the angle of the mating end face
The joint plate is disposed with a space between the joint plate and the joint plate.
The joint plate is held by the
And a predetermined thickness of concrete between the joint end face
While forming the meat portion, the surface direction of the joint plate is
Specially, it is perpendicular to the circumferential direction of the concrete segment.
It is a sign.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. These figures show a state in which the joint 10 which is the circumferential end of the concrete segment B according to one embodiment is being manufactured. Joint part 1
The bonding end surface 11 of 0 is formed obliquely to the width direction corresponding to the segment K shown in FIG. 9 as described above. Reference numeral 1 denotes a mold for forming the joint end face 11 (FIG. 2).
A joint fitting 20 is arranged inside the mold 1. The joint fitting 20 is formed by integrally forming brackets 22 on both sides of a triangular joint plate 21 with ductile cast iron.
Are orthogonal to. In addition, the mold 1 has a joint end surface 11.
Has a ridge 1a forming a seal groove 11a (see FIG. 3).

In the joint fitting 20, the joint plate 21 is perpendicular to the circumferential direction of the segment B with the taper washer 30 interposed in the mold frame 1, the apex side faces the outer surface side of the segment B, and the bottom surface is the inner surface. It is installed in the same state. Since the joint plate 21 is orthogonal to the circumferential direction of the segment B, the bracket 11 extends inward along the circumferential direction. A female screw portion 23 is formed on the upper and side portions of the bracket 22, and the female screw portion 23
An anchor bar 31 extending in the circumferential direction is screw-connected.

The taper washer 30 is disposed so as to coincide with the bolt insertion hole 21 a formed in the joint plate 21, and a contact surface 30 a to the mold 1 is cut at the same angle as the joint end surface 11. A boss 21c is formed around the bolt insertion hole 21a on the outer surface of the joint plate 21. Note that the boss 21c is not always necessary, and may be deleted as necessary. When the contact surface 30a is brought into contact with the mold 1, the other surface, that is, the contact surface 30b to the joint plate 21 is parallel to the width direction, and the outer surface of the boss 21c of the joint plate 21 is attached to the contact surface 30b. By being abutted, the fitting 20
Holds the above installation state. The joint plate 2
A bulging portion 21b that contacts the mold 1 is formed at the bottom of the mold 1. This bulging portion 21b becomes unnecessary when a plurality of bolt insertion holes 21a are arranged at an interval vertically.

The joint fitting 20 includes a mold 1 and a bolt insertion hole 2.
1a, it is fixed by a reamer bolt 32 screwed into a core (not shown) forming a bolt box 12, and thereafter, concrete 13 is poured into the formwork 1. Between the joint plate 21 and the mold 1, that is, between the joint end surface 11, the tapered washer 30 is interposed, thereby forming a meat portion 13 a of the concrete 13. Concrete 13
When is cured, the reamer bolt 32 is removed, and the mold 1 and the taper washer 30 are removed to obtain the segment B. After the taper washer 30 is removed, a counterbore-shaped bolt insertion hole 14 is formed.

In order to join the segment B to another segment, for example, the above-mentioned segment K by the joint fitting 20, the joint fitting 20 is similarly embedded in the segment K side as shown in FIG. The bolt insertion holes 14 are aligned with each other, a bolt 34 is passed from the bolt box 12, and the bolt 34 is fastened with a nut 35.

According to such a joint structure, the joint fitting 2
0 is buried in the concrete 13 in a state perpendicular to the circumferential direction of the segments B and K irrespective of the angle of the joint end face 11, so that a plurality of types of joints having a shape corresponding to the angle of the joint end face 11 are provided. There is no need to manufacture multiple types of metal fittings. FIG. 5 shows the joining state of the segments A. As described above, the same joint fitting 20 is used for the segment A.
The segments A and B and the segments B and K can be joined together. Further, the positioning of the joint fitting 20 with respect to the joint end face 11 is performed by a taper washer 30, and a plurality of types of taper washers 30 whose contact surface 30a has a shape corresponding to the joint end face may be prepared.

Therefore, as compared with the conventional art, the joint fittings are shared, the cost is reduced, and the work of adjusting the installation direction to the concrete to the joint end face is omitted, and the handling is simplified. Also, since the joint plate 21 can be exposed to the bolt box 12, the joint plate 2
It does not happen that the concrete 13 hardly spreads between the bolt box 1 and the bolt box 12.

FIG. 6 shows a modification of the first embodiment. Instead of the taper washer 30, a projection 1b is provided on the mold 1 itself, and a joint fitting 20 is attached to the distal end surface of the projection 1b.
The fitting 20 is fixed to the mold 1 by inserting the reamer bolt 32 with the front surface of the joint 1 pressed. in this case,
The joint fitting 20 is directly fixed to the formwork 1 and does not move even if the concrete 13 is cast, so that the positioning of the joint fitting 20 is reliably performed.

Next, another embodiment of the present invention will be described with reference to FIG. Reference numeral 40 in the figure denotes a joint fitting comprising a joint plate 41 and a bracket 42 made of a steel plate. The joint fitting 40 is buried in the joint portion 10 of the concrete 13 constituting the main part of the segment A. Joint plate 4
On both sides of the front surface of 1, it is in contact with the formwork 49. Formwork 4
9 is formed with a tapered convex portion 49a that contacts the front surface of the joint plate 41. The joint fitting 40 is fixed by a reamer bolt 32 which is passed through a bolt insertion hole 41a of the mold frame 49 and the joint plate 41 and is screwed into a core (not shown) which forms the bolt box 12. 13 is cast. An anchor bar (not shown) is welded to the outer surface of the bracket 42. After the concrete 13 has hardened, the reamer bolt 32 is pulled out, the formwork 49 is removed, and the segment A is obtained. Joint plate 41 and joining end surface 1
Between them, a meat portion 13a made of concrete 13 is formed. The present invention can be applied to a steel fitting 40 as in the other embodiments.

[0018]

As described above, according to the present invention,
The segments are joined together by a joint fitting from a joint plate that is actually bolted and the plane direction of which is orthogonal to the circumferential direction of the segment and a bracket that is fixed to the joint plate so as to extend in the circumferential direction. Regardless of the angle of the joint end surface, the shape of the joint fitting can be shared, resulting in reduced cost and easier handling.
Furthermore, sufficient filling of concrete becomes possible.

[Brief description of the drawings]

1 is a view for explaining a method for manufacturing a segment according to one embodiment of the present invention, and is a cross-sectional view taken along line PP of FIG. 2;

FIG. 2 is a front view showing a joint end face of the segment.

FIG. 3 is a sectional view taken along line RR of FIG. 2;

FIG. 4 is a partial sectional view showing a joint structure of a segment according to an embodiment of the present invention.

FIG. 5 is a partial sectional view showing another embodiment of the joint structure.

FIG. 6 is a cross-sectional view showing a modification of the method for manufacturing a segment according to one embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a method for manufacturing a segment according to another embodiment of the present invention.

FIG. 8 is a front view of a ring constructed by assembling a plurality of segments.

FIG. 9 is a diagram showing a joining state of three types of segments constituting a ring.

FIG. 10 is a sectional view showing an example of a conventional fitting.

FIG. 11 is a cross-sectional view showing another example of a conventional fitting.

FIG. 12 is a rear view of the fitting.

[Explanation of symbols]

1,49 ... mold, 10 ... joint part, 11 ... joint end face, 13
a ... meat part, 20, 40 ... joint fittings, 21, 41 ... joint plate, 22, 42 ... bracket, 30 ... spacer, A,
B, K: Concrete segment.

Claims (1)

(57) [Claims] 1. A concrete seg formed in the shape of an arc plate
With fittings embedded at the circumferential end of the
And the peripheral end faces were brought into contact with each other and
The joint plates of the joint fitting of the concrete segment
Bolted together with concrete segments
Concrete segment that manufactures joints that join technicians
A method of manufacturing a joint part of a joint , wherein the joint fitting is set inside a mold forming the joint end face.
And cast concrete into the formwork to remove the joint.
In manufacturing, a gap corresponding to the angle of the joint end face to be formed is formed between the mold and the mold.
Leave the joint plate with a gap from the form
And the joint plate is held on the form by a reamer bolt.
By doing so, between the joint plate and the joint end face
With the formation of the meat part of the predetermined thickness by concrete
In the concrete segment,
Concrete section characterized by being orthogonal to the circumferential direction of
Manufacturing method of the joint part of the segment.