JP2974605B2 - Manufacturing method of segment for tunnel lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel box formed by a pair of arc-shaped main girders, a pair of joint plates and a skin plate and having an open surface curved in an arc, and filled in the box. The present invention relates to a method for manufacturing a segment for tunnel lining which is made of concrete and has an outer peripheral surface and an inner peripheral surface defined by the skin plate and the concrete, respectively.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a segment formed by filling a steel box with concrete, the box having an open surface curved in an arc shape facing upward, or on each main girder and on each main girder. Concrete is poured into a box in which a concrete damming member is arranged on a joint plate, and then the cast concrete is leveled with a trowel to form the inner peripheral surface of the segment, and the open surface of the box is Formed a concrete surface extending along.

By the way, there is a difference in height between the center of the box with the open surface facing upward and each end thereof. For this reason, the concrete poured into the box body flows through the box body from the end side of the box at a higher position toward the center portion at a lower position, and extends along the open surface of the box. Inability to maintain the concrete surface.

[0004] For this reason, conventionally, in order to maintain a curved concrete surface, the concrete leveling operation with a trowel has been repeated until the cast concrete hardens and its fluidity decreases. . From this,
The production of the segments required a great deal of effort.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the labor required for manufacturing a segment formed by filling concrete into a steel box having an open surface curved in an arc shape.

[0006]

In the method of manufacturing a segment according to the present invention, first, a box body is placed with its open surface curved in an arc shape facing upward, and concrete is placed inside the box body. throw into. Concrete is cast so as to rise from the open surface. Next, a template for forming the inner peripheral surface of the segment is placed on both main girders. The template has an arc length shorter than the open surface of the box. By placing the template, the raised concrete is pushed into the box. Next, concrete is refilled into the box from between the template and each joint plate of the box.
After the concrete hardens, the template is removed.

When the inner peripheral surface of the formed segment protrudes from the open surface of the box, that is, when the inner peripheral surface is spaced from the open surface and extends along the open surface. Before or after placing the concrete, a spacer is disposed on each main girder of the box body and extends in a curved manner along the main girder. Next, a template for forming the inner peripheral surface of the segment is placed on both spacers. It does not matter whether the arc length of the template is shorter than the open surface of the box. The raised concrete is pushed into the box body by placing the template on the spacer.

[0008]

According to the present invention, a template is placed on both the main girder or the both spacers, pressed against concrete rising from the open surface of the box, and pressed into the box. Thereby, the space defined by the central part (lower part) of the box and the template can be filled with concrete. Further, concrete is replenished into the box body from between the formwork and each joint plate of the box body, so that a portion (a high-order portion) between a central portion of the box body and each end thereof and the The space defined by the template can be filled with concrete. The concrete filled in the box is constrained by the template in a space defined by the template and the box, and the template in contact with the concrete is:
A curved surface extending along the open surface of the box is formed and maintained. Therefore, as compared with the related art, it is possible to significantly reduce the labor for forming and maintaining a curved surface in the concrete cast in the box body, thereby reducing the labor required for manufacturing the segments. Can be.

[0009]

FIG. 1 shows a tunnel lining segment 10 manufactured according to the manufacturing method of the present invention.

The segment 10 includes a steel box 12 having an open surface 11 (see FIG. 3) that is curved in an arc shape, and a box 12 made of steel.
And an outer peripheral surface 16 defined by a skin plate 26 described later of the box 12.
And an inner peripheral surface (concrete surface) 18 defined by the concrete 14.

In the illustrated example, the inner peripheral surface 1 of the segment 10
8 extends above the open surface 11 of the box body 12 at a distance from the open surface 11 in a curved manner along the open surface.

The manufacturing method of the present invention is not limited to the segment shown in the drawing, and the inner peripheral surface extending on the same surface as the open surface 11 of the box 12, that is, without any interval from the open surface 11 of the box The present invention can also be applied to the production of a segment (not shown) having an inner peripheral surface extending along the open surface.

The segment 10 formed by filling (or stuffing) the concrete into the box body 12 has a plurality of spaces 20 for receiving joint bolts for connecting the segments 10 during tunnel lining, Segment 1
0 is provided in the thickness direction thereof. Each joint bolt receiving space 20 is segment 1
0, and the injection hole 21 is open on both the inner and outer peripheral surfaces 16, 18 of the segment 10.

As shown in FIG. 2, the box body 12 that is curved in an arc shape as a whole includes a pair of main girders 22 that extend in a curved manner in an arc shape.
A pair of joint plates 24 fixed to the ends of the two main girders 22 and forming a frame together with the main girders, and a skin plate 26 fixed to the frame and covering an open surface on the outer peripheral side of the frame (FIG. 3) Reference).

Each main girder 22 and each joint plate 24 have a plurality of bolt holes 28 through which the joint bolts pass.
Is provided. Each bolt hole 28 of the segment 10 communicates with each joint bolt receiving space 20.

The illustrated box 12 is provided with a plurality of vertical ribs 30 for connecting the two main girders 22 to each other. The plurality of vertical ribs 30 are arranged at an interval from each other in a direction in which the main girder 22 curves and extends, that is, in a direction in which the box body 12 extends.
Further, the box body 12 is fixed to the skin plate 26 at a central portion in each of its longitudinal direction (the extending direction of the main girder 22) and its width direction (the extending direction of the joint plate 24), and Is provided. The cylinder 32 communicates with a hole 33 (see FIG. 3) provided in the skin plate 26. The cylinder 32 is the box 12
And has a height dimension shorter than the depth of the backfill injection hole 21.

The segment 10 is manufactured as follows.

First, the box body 12 is arranged with its open surface 11 facing upward, and the posture is maintained (FIGS. 1 and 3).

The box body 12 can be placed on, for example, a table 36 to maintain its posture. The table 36 is disposed between a pair of opposing side plates 38 and between the both side plates 38.
(In the example shown in the figure, three).

The side plates 38 have a mutual spacing slightly larger than the width of the box 12 so that the box 12 can be received between them. On the other hand, a plurality of support members 4
0 are spaced apart from each other on a curved surface approximately equal to the curved surface of the skin plate 26 so that the box 12 contacts and supports the skin plate 26 of the box 12 when received between the side plates 38. Are located.

Each side plate 38 further has a box 1
A cutout 42 having substantially the same curvature as the second open surface 11 and having a length substantially equal to the curved length of the open surface 11 is provided. The distance between the plurality of support members 40 and each notch 42 is set to be substantially equal to the height or thickness of the box 12. For this reason, the box 36 is
, The open surface 11 of the box 12 and the notches 4
2 are aligned on a common curved surface.

Next, the concrete 34 is cast into the box 12 on the table 36 so as to rise from the open surface 11, more specifically, to rise above both spacers 52 (FIG. 3). The concrete 34 in the box body 12 is vibrated during the concrete placement and during the refilling of the concrete described later, for example, by operating a shaker (not shown) attached to the base 36.

Although the concrete 34 can be put in an arbitrary position on the box body 12, it is preferably cast on the central portion of the box body 12, as shown in the illustrated example. As shown in FIG. 3, since the central portion of the box body 12 in the extending direction is lower in height and both ends thereof are higher, the concrete 34 is cast into the central portion of the box body 12 after casting. And then gather at the center.

Prior to placing the concrete 34, preferably prior to placing the box 12 on the platform 36,
A plurality of blocks 44 and a plurality of other blocks (not shown) for securing the joint bolt receiving space 20 in the concrete 34 are arranged therein, and the backfill injection hole 21 is provided.
And a block 46 (FIG. 3) for securing the remaining part of.

Each block 44 abuts against each main girder 22 and skin plate 26, and each joint plate 24 and skin plate 26, and closes each bolt hole 28. The other block has the same cross-sectional shape as the block 44 and is arranged on the block 44. Each block 44 and the other blocks are respectively a box 1
A space is secured in the cast concrete 34 in the inside 2 and above the outside of the box 12.

The block 46 has the same cross-sectional shape as the cylinder 32 and is arranged on the cylinder 32. Block 4
6 secures a space communicating with the cylindrical body 32 in the cast concrete 34 inside and outside the box body 12. The blocks 44 and 46 and the other blocks are made of, for example, a rubber material, a foamed plastic material, or the like.

Next, a template 50 for forming the inner peripheral surface 18 of the segment 10 is placed so that both ends of the template 50 are located on the two joint plates 24 side of the box, and a pair of spacers 52 are interposed therebetween. And placed on both main girders 22 of the box 12.

The template 50 is made of a steel plate, and has the same width dimension as the box 12 and a curved length (circumferential length) smaller than the curved length (circumferential length or arc length) of the open surface 11 of the box 12. Or arc length). Since the template 50 is shorter than the arc length of the open surface 11 and the spacer 52 is interposed between the template 50 and the open surface 11, the template 50 is
When placed on top, each joint plate 24 of the template 50 and the box 12
And a space (gap) is generated between them. Instead of this example, the arc length of the template 50 can be set to be longer than the arc length of the open surface 11. In this case, there is a gap between the template and each joint plate 24 because of the presence of both spacers 52. The gap may be large enough to allow concrete to enter the box 12 later through the gap. Therefore, the length dimension of the template defining the gap is set to a size that does not hinder the molding of the inner peripheral surface 18 of the segment by the template.

Each spacer 52 is made of a rubber material, a metal material such as steel or iron, or the like, and extends along each main beam 22 in a curved manner. The spacers 22 are located between the main girders 22 and the template 50 to maintain a space between the open surface 11 and the template 50 facing the same, and also serve to block the concrete 34.

Each of the spacers 52 in the illustrated example has the same curvature as the lower surface of the template 50 and has the same length as the template 50 and the upper surface of the main girder 22 defining the open surface 11. A lower surface having a curvature and having the same length dimension as the upper surface of the main girder 22. In addition, each spacer 52
Has a larger width dimension than its lower surface, and the bottom surface has the same width dimension as the main girder 22. Therefore, the spacer 52 also forms an inclined surface extending from the open surface 11 of the box body 12 to the inner peripheral surface 18 of the segment.

In the illustrated example, both spacers 52 are
The two main girders 22 are fixed to the bottom surface of the template 50 at the same interval as each other, and extend in the circumferential direction of the template 50. According to this example, when arranging both spacers 52 on both main girders 22 of the box 12, the template 50 is placed on both spacers 52 simultaneously with the arrangement. When placing the spacer 52,
When a part of the cast concrete 34 is scattered on each main girder 22, the concrete 34 is wiped off from both main girder 22.

The two spacers 52 can be used without being fixed to the template 50 instead of the example shown. In this case, before the concrete 34 is cast, the spacers 52 are attached to the inner surface of the box 12 or the side portion 60 of the frame 58 by using an appropriate attachment tool. 12 are arranged on both main girders 22.

By placing the template 50 on both spacers 52, the concrete 34 rising upward from the open surface 11 of the box body 12 is crushed by the pressing force of the template 50. As a result, the interior space of the box 12 and the outer space between the spacers 52 are filled with the concrete 34 in the central portion and the vicinity thereof. That is, the concrete 34 is pushed into the center of the box 12.

When manufacturing the segment having the inner peripheral surface on the open surface 11 of the box body 12, the spacer 5
2 is not needed. The template used in this case has a curved surface conforming to the open surface 11 of the box, and has the same width dimension as the box 12 and the curved length (the circumferential length) of the open surface 11 of the box 12. (The length in the circumferential direction or the length of the arc) slightly smaller than the length of the box (or the length of the arc). Since the arc length of the template is shorter than the arc length of the open surface 11, a gap is formed between the template on the box body 12 and each joint plate 24 of the box body 12 for putting concrete later. The placed concrete plate covers a part of the open surface 11 and rises from the open surface 11.
4 is crushed and pushed into the central portion of the box 12.

Thereafter, concrete 34 is replenished into box 12 through the gap between template 50 and each joint plate 24 of the box (FIG. 4). The concrete 34 is placed in the box 1
Because it is located at the highest position of 2, concrete 3
Reference numeral 4 gradually fills the remaining space in the box 12 and the remaining space between the spacers 52 from below to above. The replenished concrete 34 contacts and mixes with the previously poured concrete 34 to be integrated.

A pair of vertical plates 54 are attached to both ends of the template 50 in order to facilitate the introduction of the concrete 34 from the gap. Further, it is desirable that a pair of guide members 56 be arranged on the table 36 in advance.
Each vertical plate 54 cooperates with each guide member 56 to define a concrete inlet 57 communicating with the gap.

Each guide member 56 is supported by a frame 58 that can be placed on the table 36. The frame 58 is the base 3
6. Place on top. The placement of the frame 58 on the table 36
This is performed before placing the concrete 34 and after placing the box 12 on the table 36.

The frame 58 is, when viewed from the state where it is placed on the table 36, on both side plates 38 of the table 36, and extends in contact with the tops and the notches 42.
0 and plate-shaped both ends 62 crossing both side plates 38 of the base 36. Each side portion 60 of the frame is on the side of each spacer 52 to prevent the raised concrete 34 poured into the box 12 from spilling out of the box 12 beyond each spacer 52.

Each of the illustrated guide members 56 is made of angle iron,
The frame 58 is fixed to both side portions 60 and each side portion 62 and extends in parallel with both end portions 62. When the frame 58 is placed on the table 36, one piece 56a of the angle iron comes into contact with the joint plate 24 of the box, and the other piece 56b and the form 48
Each of the vertical portions 54 defines a wide opening that is open upward. The excess concrete 34 that is put in for replenishment and remains in the inlet 57 is scraped off, for example, by moving a ruler along each joint plate 24. Thereby, an inclined surface inclined from the joint plate 24 of the box body 12 toward each end in the circumferential direction of the template 50 can be formed on the concrete.

In the example shown, the weight of the template 50 is increased so that the template 50 is maintained at the mounting position, and the space defined by the template 50 and the two vertical plates 54 is provided for reinforcement. Are disposed a plurality of steel plate members 64, 66 (FIG. 2). Each plate member 64 is fixed to the template 50 and both vertical plates 54, and the plate member 66 is fixed to the plate member 64.

The concrete 34 which has been poured into the space within the box 12 and between the spacers 52 and has been replenished is restrained in the space by the template 50, so that the box 12 is moved from the higher side to the lower side. Does not occur. Also, a surface that is in contact with the template 50 and curves along the template 50 is formed and maintained on the concrete 34. The concrete 34 is cured in this state.

After the concrete 34 has hardened, the template 50 and the spacer 52 are removed and removed. As a result, the segment 10 in which the box 12 is filled with the concrete 14 is
Is obtained. The segment 10 has an inner peripheral surface 18 formed by a template 50.

In the case of manufacturing the segment having the inner peripheral surface on the open surface 11 of the box body 12, after the concrete is hardened, the template is removed and removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tunnel lining segment.

FIG. 2 is an exploded perspective view of a box supporting device.

FIG. 3 is a longitudinal sectional view of a box body and a formwork on which concrete is cast.

FIG. 4 is a longitudinal sectional view of a box and a formwork filled with concrete.

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Segment 11 Open surface 12 Box body 14, 34 Concrete 16, 18 Peripheral surface and inner peripheral surface of segment 22 Main girder 24 Joint plate 26 Skin plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B28B 1/00 B28B 7/10 E21D 11/08

Claims (2)

(57) [Claims] 1. A steel box formed by a pair of arc-shaped main girders, a pair of joint plates, and a skin plate and having an open surface curved in an arc shape, and a concrete filled in the box, A method for manufacturing a tunnel lining segment having an outer peripheral surface and an inner peripheral surface defined by the skin plate and the concrete, respectively,
A mold plate for arranging the box body with its open surface facing upward, casting concrete in the box body so as to rise from the open surface, and forming an inner peripheral surface of the segment. Placing a template having an arc length shorter than the open surface of the box on the two main girders, thereby pushing the raised concrete into the box, the template and each joint plate of the box and A method for manufacturing a segment, comprising: replenishing the box body with concrete from between, and after curing of the concrete, removing the template. 2. A steel box having a pair of arc-shaped main girders, a pair of joint plates, and an open surface curved in an arc formed by a skin plate, and concrete filled in the box, A method for manufacturing a tunnel lining segment having an outer peripheral surface and an inner peripheral surface defined by the skin plate and the concrete, respectively,
Arranging the box body with its open surface facing upward, pouring concrete into the box body so as to swell from the open surface, prior to or after placing the concrete, Placing a spacer extending along the main girder in a curved manner along the main girder, placing a template for forming the inner peripheral surface of the segment on the spacer, and thereby setting the raised concrete to the Including pushing into the box, refilling the box with concrete from between the template and each joint plate of the box, removing the template and spacers after curing of the concrete, Manufacturing method.