JP2651587B2 - Method of manufacturing steel segments - Google Patents

Description

The present invention relates to a method for manufacturing a steel segment to be installed on a tunnel wall excavated by a shield method.

[Conventional technology]

Conventionally, in order to manufacture a steel segment, a rectangular steel plate is curved in a concave arc shape to form a skin plate (a).
As shown in FIG. 10, the half width portion of the lower end convex arc-shaped end surface of the main girder plate (b) curved in the shape of a bow with the same curvature as the skin plate (a) is brought into contact with the concave arc of the skin plate (a). The half width portion of the lower end surface of the elongated rectangular joint plate (c) is brought into contact with the front and rear straight edges of the surface, and the lower end surfaces of these main girder plates (b) projecting from the skin plate (a) and the joint plate (c) )
The lower end surface of the skin plate (a) and the end surface of the skin plate (a) are integrally fixed by fillet welding (d), so that the main girder plate (b) and the joint plate ( c) to form a segment having a frame-like frame.

[Problems to be solved by the invention]

However, the finished dimensions of the members, such as the skin plate (a), the main girder plate (b), and the joint plate (c), which have been cut in advance, are not always accurate, and moreover, the product is welded as it is obtained. Variation occurs. Particularly, when the segments are constructed in the circumferential direction of the tunnel wall surface, the outer surfaces of the joint plates of the adjacent segments are joined together by bolts and nuts while joining the outer surfaces thereof, but the joint plate (c) is a skin plate ( Since it is fixed by fillet welding as described above with respect to a), a fillet weld cannot be formed at a right-angled corner, and therefore, between the joined joint plates (c) and (c). A V-shaped groove is formed in the length direction of the tunnel, and it is difficult to accurately make the rising angle with respect to the skin plate (a) a right angle, and the length direction is completely set in the width direction of the skin plate (a). In addition, since the joint plate (c) has a wavy irregular surface on its surface during processing, when the segments are joined as described above, accurate joining is performed. Gap between bonding surfaces groundwater is disadvantageously entering occur with no.

Also, the joint plates of the segments are connected to each other by bolts when installing on the tunnel wall surface.
Since the bolt hole formed in the hole is usually formed with a larger diameter than the bolt, a step-like displacement occurs between the joint plates (c) and (c) of the segment as shown in FIG. As shown in FIG. 12, the main girder plates (b) and (b) are displaced from each other, and there is a problem that accurate construction cannot be expected.

The present invention has been made to solve the above problems and to provide a method for manufacturing a steel segment for the purpose of obtaining an accurate steel segment.

[Means for solving the problem]

In order to achieve the above object, a method for manufacturing a steel segment according to the present invention includes a method of manufacturing a steel segment, comprising the steps of: forming an arc-shaped curved skin plate having a width and a length slightly larger than a finished design dimension; The lower end surface of a curved main girder plate having a thickness formed to be thicker than the finished design dimension and having a groove portion extending from the outer surface to the inner surface over the entire length at the lower end is brought into contact with the front and rear of the skin plate. On the straight edge, the lower end face of the joint plate having a thickness and a length larger than the finished design dimensions and having a groove at the lower end from the outer surface to the inner surface over the entire length is brought into contact, In this state, welding is performed from the outside to the inside of the finished design dimension from the outside to the groove, and the curved main girder plate and the joint plate are integrally fixed on the four edges of the skin plate, and thereafter, Skin plate width and length The entire outer surfaces of the main girder plate and the joint plate are cut from the end face of the skin plate so as to have the design dimensions and the joint angles of the skin plate and the main girder plate and the joint plate become the design angles. Further, a knock pin hole for positioning is formed in the joint plate.

[Action]

By welding the groove provided at the lower end of the main girder plate and the joint plate from the outside of the skin plate, the main girder plate and the joint plate can be easily fixed and integrated on the four edges of the skin plate. it can.

Furthermore, after welding, the entire outer surfaces of the main girder plate and the joint plate are cut from the four end surfaces of the skin plate, so that the main surface of the skin plate becomes the joint surface between the segments when the segments are assembled. The outer surfaces of the girder plate and the joint plate can be formed as flat surfaces without irregularities, and the outer surfaces of the main girder plate and the joint plate can be formed to have an accurate angle with respect to the curved surface of the skin plate. Therefore, it is possible to manufacture a high-precision segment that can be tightly joined on the whole surface without generating a gap between skin plate end faces, joint plates, and main girder plates of segments to be joined at the time of tunnel lining.

In addition, in the case of providing a knock pin hole in the joint plate of the segments to be joined to each other, in particular, it can be provided at an accurate position by drilling after the above-mentioned cutting, and therefore, when assembling the segments, between these holes. By inserting the dowel pins, there is no step-like displacement between the joint plates, and thus between the main girder plates, and it is possible to accurately match the gap between the bolt holes between the joint plates and between the main girder plates, enabling accurate construction. In addition, the efficiency of the assembly work can be improved.

〔Example〕

Referring to the drawings, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1 and FIG. 2, (1) is a rectangular steel plate skin plate whose width and length are slightly larger than the finished design dimensions. The portion is gradually curved in an arc shape with a predetermined radius of curvature on one side (upper side in the figure) toward the front and rear end edges in the length direction from the portion.

(2) is a main girder plate which is integrally fixed to both side edges of the skin plate (1) made of a steel plate by welding. The main girder plate is bent to the same curvature as the skin plate (1) in the longitudinal direction and has a lower end convex arc surface. (2a) is formed so as to be closely in the longitudinal direction to both side edges of the curved surface of the skin plate (1).

(3) is a rectangular joint plate fixed to the front and rear linear edges of the skin plate (1), and the thickness thereof is formed larger than the finished design dimensions together with the main girder plate (2).

The curved main girder plate (2) and the joint plate (3) are made of steel like the skin plate (1), and a plurality of bolt holes (4) (4) at regular intervals in the longitudinal direction. , (5)
(5) ... and a pair of knock pin holes (6) (6) at a certain interval in the length direction.
(7) Like (7), the bolt hole (4) is formed so as to penetrate between the inner and outer surfaces. The knock pin holes (6) and (7) may be provided one by one.

The length of the curved main girder plate (2) is shorter than the length of the skin plate (1) by the thickness of two joint plates (3), and the length of the joint plate (3) is smaller than the skin plate (1). The main girder plate (2) and the lower end surfaces of the joint plate (3) are formed into a chamfered shape from the outer surface side as shown in FIG. Notched groove portions (8) and (9) are respectively provided over the entire length.

To manufacture a segment by welding a pair of main girders (2) and (2) and joint plates (3) and (3) to the skin plate (1) thus formed, first, the skin plate (1) The lower end convex arc surface (2a) of the main girder plate (2) is oriented on the both side edges of the curved surface of the concave arc surface of the main girder plate (2), the groove portion (8) is directed outward, and the outer surface is the side end surface of the skin plate (1). With the joint plate (3) on the front and rear straight edges of the skin plate (1) with the groove (9) facing outward. In addition, the outer surface thereof is brought into close contact with the end surface of the skin plate (1) so as to be flush, and the inner surfaces of both ends are brought into contact with the end surfaces of both main girder plates (2) and (2).

Next, the main girder plate (2) against the skin plate (1)
While holding (2) at a substantially right angle, welding (10) is performed on the space between the upper surfaces of both ends of the skin plate (1) and the groove (8) of the main girder plates (2) and (2). The main girder plate (2)
(2) is fixed to the skin plate (1).

Similarly, the joint plates (3) and (3) are disposed on the front and rear straight edges of the skin plate (1) as described above, and welding (10) is performed in the groove (9). Thus, the joint plates (3) and (3) are fixed to the skin plate (1) at a desired angle such as the normal direction of the skin plate (1) in the same manner as the main girder plate (2).

Either of the work of welding the main girder plate (2) and the joint plates (3) and (3) to the skin plate (1) may be performed first.

In this way, after forming the frame by the main girder plates (2) and (2) and the joint plates (3) and (3) on the four edges of the concave arc surface of the skin plate (1), a cutting machine controlled by NC. The main girder plate (2) from the four end faces of the skin plate (1) using
(2) and the outer surfaces of the joint plates (3) and (3) are cut (12) over the entire surface as shown in FIG. 5 to form segments of predetermined dimensions in both width and length, and the main girder plate (3). 2) (2)
The outer surfaces of the joint plates (3) and (3) are formed as flat surfaces without irregularities, and the main girder plates (2) and (2) and the joint plate (3)
(3) The outer surface is cut so as to have an accurate right angle or a predetermined angle with respect to the skin plate.

The bolt holes (4) (5) and the knock pin holes (6) (7) formed in the main girder plates (2) (2) and the joint plates (3) (3) are the skin plate (1). To main girder plate (2)
Or the joint plate (3) may be provided before welding.
Also, the holes may be drilled after or before cutting by the cutting machine.

As shown in FIG. 3, a plurality of reinforcing ribs (13) are fixed by welding between the opposing surfaces of the main girder plates (2) and (2) to form a segment.

The segments manufactured in this manner are applied to the inner wall surface of the tunnel in a circumferentially lining state as shown in FIG. 6, and are sequentially applied while being juxtaposed in the length direction as shown in FIG. At this time, in the circumferential direction, between the knock pin holes (7) (7) of the joint plates (3) (3) of the segments whose outer surfaces are joined to each other in the circumferential direction,
As shown in the figure, if a knock pin (14) having substantially the same diameter as the knock pin hole (7) is inserted, displacement of the segments can be prevented and bolt holes (3) of the joint plates (3) (3) can be prevented. 5) (5) is accurately positioned, and in this state, bolts, (5) (5)
It is connected firmly by a nut. Similarly, the main girder plate of the segment to be joined in the length direction of the tunnel (2)
(2) As shown in Fig. 9, the knock pins (14) are inserted between the knock pin holes (6) and (6) to prevent displacement, and then the bolt holes (4) and (4) are bolted. , And are firmly connected by nuts.

In the above embodiment, knock pin holes are provided in the main girder plate (2) and the joint plate (3).
May be provided only for

〔The invention's effect〕

As described above, according to the method for manufacturing a steel segment of the present invention, the width and the length are formed on both side edges of the concave arc surface of the arcuately curved skin plate formed to be slightly larger than the finished design dimension. The lower end surface of a curved main girder plate having a thickness formed to be larger than the finished design dimension and having a groove at the lower end extending from the outer surface to the inner surface over the entire length; On the edge, the lower end surface of a joint plate having a thickness and a length larger than the finished design dimensions and having a groove at the lower end extending from the outer surface to the inner surface over the entire length is brought into contact. The groove is welded from the outside to the inside of the finished design dimension from the outside to fix the curved main girder plate and the joint plate integrally on the four edges of the skin plate, and then the skin plate Designed for width and length The entire outer surface of the main girder plate and the joint plate is cut from the end face of the skin plate so that the joint angle between the skin plate and the main girder plate and the joint plate becomes the designed angle so as to be a law. Since the groove provided at the lower ends of the main girder plate and the joint plate is open outward from the edge of the skin plate, the main girder plate with respect to the upper surface of the edge of the skin plate from the outside of the skin plate, The joint plate can be welded easily and efficiently, and can be welded deeper and deeper than the finished design dimension over the entire length.

Furthermore, after this welding process, since the cutting process is performed over the entire outer surfaces of the main girder plate and the joint plate from the four end surfaces of the skin plate, the four end surfaces of the skin plate that are the joining surfaces of the segments at the time of segment assembly are used. The outer surfaces of the main girder plate and the joint plate can be formed as flat surfaces without irregularities, and the outer surfaces of the main girder plate and the joint plate have a predetermined angle with respect to the curved surface of the skin plate, that is, when the segments are joined to each other. It can be formed with high precision so that the joining surface is at an angle that makes the entire surface closely contact.

Therefore, even if there is some deviation in the fixation of the main girder plate and the joint plate to the skin plate in the welding process, the deviation can be surely eliminated by this cutting process, and the segments to be joined at the time of tunnel lining. Thus, a segment that does not produce a gap between the end faces of the skin plate, between the joint plates, and between the main girder plates can be obtained, and by using this segment, infiltration of groundwater or the like can be reliably prevented.

In addition, since holes for knock pins for positioning are formed in the joint plates, the bolts between the joint plates are inserted by inserting the knock pins between the knock pin holes of the joint plates joined to each other at the time of assembling the segments. The holes can be accurately positioned, and accurate construction can be performed without causing a step-like displacement between the joint plates. As a result, a steel segment that can increase the efficiency of assembly work can be obtained.

[Brief description of the drawings]

1 to 9 show an embodiment of the present invention.
The figure is an exploded perspective view of a segment, FIG. 2 is a perspective view of an assembled state, FIG. 3 is a perspective view of a manufactured segment, FIG. 4 is a longitudinal sectional view of a main girder or joint plate, and FIG. 6 is a simplified vertical sectional view of a state where the tunnel is constructed, FIG. 7 is an enlarged sectional view of a main part showing a joining state of segments, and FIG. 8 is a sectional view of the tunnel. FIG. 9 is an enlarged cross-sectional view of a main part showing a joint state between segments in the length direction of the tunnel, FIG.
FIG. 1 is a cross-sectional view showing a conventional welding method, and FIG. 11 and FIG. (1) ... skin plate, (2) ... main girder plate, (3)
... Joint plate, (4) (5) ... Bolt holes, (6) (7)
... Knock pin holes, (7) and (8).

Claims (1)

(57) [Claims] 1. An arc-shaped curved skin plate having a width and a length slightly larger than a finished design dimension. In addition, the lower end surface of the curved main girder plate having a groove portion extending from the outer surface to the inner surface over the entire length at the lower end is abutted, and the thickness and length are finished on the front and rear linear edges of the skin plate. The lower end surface of a joint plate formed larger than the size and having a groove at the lower end extending from the outer surface to the inner surface over the entire length is brought into contact with the joint plate. Also, the curved main girder plate and the joint plate are integrally fixed on the four edges of the skin plate by welding up to the inside, so that the width and length of the skin plate become the design dimensions. And skin plate and main girder plate Knock pin holes for cutting the entire outer surfaces of the main girder plate and the joint plate from the end surface of the skin plate so that the respective joint angles with the joint plate and the joint plate become the design angles, and further positioning the joint plate. A method for producing a steel segment, comprising: