JP2926338B2 - Method of manufacturing segment flat steel for tunnel lining - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a segment flat steel material for a tunnel lining, particularly a flat steel material having a seal groove for attaching a seal material.

<Prior art> As a known segment for tunnel lining, a seal groove is provided in a ring plate or an end plate provided around the segment, and a seal material is attached to the seal groove.
There has been known one in which adjacent segments are joined with bolts and nuts or the like.

<Problems to be Solved by the Invention> However, the sealing groove of the segment has a tapered shape in which the shape of the groove is gradually opened upward toward the opening for the reason of molding, and the seal adhered in the groove. There were inconveniences such as falling off and displacement of the material by the time of segment joining.

The present invention has been made in order to solve the above-mentioned drawbacks, the purpose of which is to remove the seal material from the seal groove by a simple operation, or a tunnel lining segment in which the displacement does not occur, An object of the present invention is to provide a flat steel material for a segment for obtaining an end plate and a ring plate in the segment.

<Means for Solving the Problems> The gist of the present invention is to provide a method of manufacturing an end plate and a ring plate of a segment from a metal material using a rolling mill. And a flat opening in one of the flat portions of the flat steel material, which is deviated from the center in the width direction of the flat steel material by pressing the first mold roll. Forming a seal groove provided, and forming a strip protrusion at both ends of the seal groove in parallel with the step, and forming the strip protrusion by a second mold roll, Forming a sealing material locking piece by bending the sealing groove to face the inside of the opening of the sealing groove to form a sealing material locking piece. It is in.

As the seal material used for the seal groove of the flat steel material manufactured by such a manufacturing method, a water-swellable seal material can be considered in addition to the known seal material having adhesiveness.

<Operation> In the present invention, the segment flat steel material for tunnel lining is a flat steel material formed from a metal material and a flat steel material forming step of forming a seal groove in the flat steel material. Forming a strip-shaped projection by forming the strip-shaped projection, and sealing the opening so that the entrance width of the opening is smaller than the maximum width of the groove by bending the strip-shaped projection facing the inside of the opening of the sealing groove. It is manufactured by a sealing material locking piece forming step of providing a material locking piece.

The flat steel material for a segment manufactured in this manner is used as an end plate or a ring plate of the segment. When joining adjacent segments, the sealing material locking piece is fitted by inserting an adhesive sealing material. This prevents separation from the seal groove.

<Embodiments> Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a state where the segments are assembled in a ring shape, FIG. 2a is a perspective view showing a partly broken part of a flat steel material for a tunnel lining manufactured according to the present invention, and FIG. A partially broken perspective view of a main part of another manufactured flat steel material, FIG. 3a is a partial longitudinal sectional view in which a sealing material is pasted or glued to FIG. 2a, and FIG. 3b is a FIG. 2b. FIG. 4 is a partial longitudinal sectional view in which a sealing material is attached.

In the figure, reference numeral 1 denotes an arc-shaped skin plate, and an end plate 2 is formed around the skin plate in the circumferential direction of the tunnel to form a ring. Are welded to each other to form a box-shaped segment X. Reference numeral 4 denotes a bolt hole provided in the end plate 2 and the ring plate 3. Reference numeral 5 denotes a bolt inserted into the bolt hole, and reference numeral 6 denotes a nut. Reference numeral 7 denotes a grout hole from which mortar or the like is injected between the segment X and the ground. Reference numeral 8 denotes a reinforcing rib between the opposed ring plates 3.

In FIG. 2a, the end plate 2 of the segment X has a seal groove 10 in an outer flat portion 9 of a flat steel material Z to be a ring plate 3. 2a and 3a in the seal groove 10.
It is not necessary to provide irregularities at the bottom of the groove as shown in the figure, but as shown in FIGS. 2b and 3b, three protrusions 11 and four The strip-shaped unevenness 13 in which the recesses 12 are alternately arranged may be provided. 2a and 2b, seal material locking pieces 15 'and 16' having a width smaller than the maximum width of the tapered portion of the groove 10 are provided at both end edges of the opening 14 of the seal groove 10. .

In FIG. 2b and FIG. 3b, three convexes and four concaves are used to form the strip-shaped irregularities 13;
It is also conceivable that there are two or six concaves.

Next, examples of the method for producing a flat steel material for a segment according to the present invention will be described below.

First, as shown in FIG. 4a, a metal material heated and heated is passed between upper and lower rolls 17 and 18 and rolled. In this case, at the boundary between the opening 14 of the seal groove 10 and the outer flat portion 9, a strip-shaped projection is formed so as to have a width smaller than the maximum width of the opening 14.
The upper and lower rolls 17 and 16 are provided with a convex portion 19 for providing a flat steel seal groove 10 and a boundary between the flat outer steel portion 9 and the opening 14. Are formed by providing circumferential cutouts 20 and 21 at the locations where. Next, as shown in FIG. 5a, the strip-shaped projections 15 and 16 erected at the cutouts 20 and 21 using the second mold rolls 17 'and 18', which are smooth rolls, are moved toward the seal groove 10. The seal material is bent along two lines to form seal material retaining pieces 15 'and 16', and the seal material is
Shape that does not fall off from 10.

In addition, the sealing material locking piece is erected at the cutouts 20 and 21 in FIG. 4a, and the erected locking piece is bent in FIG. 5b. In this case, in order to facilitate bending, FIG. The first mold rolls 17 and 18 as the upper rolls are
The small notches 2 are formed on the outside of the strip-shaped projections 15 and 16 by rolling the rolls by providing small circumferential projections 22 and 23 on the outside of 0 and 21.
4 and 25 may be provided to facilitate the bending of the sealing material retaining pieces 15 'and 16' by the second mold rolls 17 'and 18' in the next step shown in Fig. 5b. Also, reference numerals 26 and 27 in FIG. 4b denote irregularities provided between the cutout portions 20 and 21 of the first die roll,
As a result, the projections 11 and the depressions 12 in FIG. 2b can be formed.

Therefore, a method of lining a tunnel using the segment X composed of the end plate 2 or the ring plate 3 in FIGS. 2a and 2b will be described.

First, the shield machine is supported on the existing segment X and operated, and the shield for one ring is propelled. At this time, in order to assemble the segment X by one ring, as shown in FIG. 3a or FIG.
A water-swellable sealing material 30 is attached to the sealing groove 10 of the opening portion 14 with glue or an adhesive, and a bolt is inserted into a bolt hole in a state where the sealing material 30 does not fall off the sealing groove 10 and tightened with a nut. I do. Further, when extending in the tunnel axial direction further than the assembled one ring segment, a water-swellable sealing material 30 is attached to the sealing groove 10 provided in the ring plate 3 of each segment, and the bolt holes are also formed. Tighten with nuts with bolts inserted. In this way, the segments X are assembled, and a cylindrical or square tubular tunnel lining is performed.

In the above case, before the segments are fastened with the bolts and nuts, the sealing material 30 is pressed against the sealing groove 10 and attached, but the maximum width of the groove is formed in the longitudinal upper and lower openings 14 of the sealing groove 10. Seal material locking piece 15 'so as to be narrower,
16 'is provided to accommodate the seal material in the seal groove 10 to prevent misalignment and falling off during segment assembly,
Since the sealing material 30 is water-swellable, it expands due to the intrusion of water after assembling the segments, and makes the seal between the segments more satisfactory.

Since the relationship between the strip-shaped irregularities 13 makes the step between the concave 12 and the convex 11 very small, the seal material can be sufficiently adhered to the entire bottom of the seal groove 10 (FIG. 3b). In addition to the above-mentioned water-swelling material, another known material having self-adhesiveness and elasticity can be used as the above-mentioned sealing material.

In the case where the width of the flat portion 9 of the end plate 2 and the ring plate 3 of the segment X is much larger, the same sealing groove as the above-described structure is formed in the upper and lower portions with the bolt hole interposed therebetween.
10 can be arranged.

<Effects of the Invention> As described above, the method for manufacturing a flat steel material for a segment according to the present invention firstly includes a seal groove having a tapered opening formed from a metal material and two ends of the seal groove formed in parallel with the seal groove. A step of forming the strip-shaped projections with a first mold roll, and a step of forming the seal material locking pieces by bending the strip-shaped projections with a second mold roll so as to face the inside of the opening of the seal groove. This makes it possible to obtain a flat steel material for a segment in which the sealing material does not come off easily and easily.

The tunnel lining segment using the flat steel material manufactured according to the present invention has a tapered shape in the longitudinal direction of the boundary between the opening and the outer flat portion in the seal grooves of the end plate and the ring plate around the segment. Since the seal material locking piece is provided so as to have a width smaller than the maximum width in the opening, the seal material can be stuck in the seal groove inside the locking piece, so that even when assembling the segment, the sealing material may be dropped and the position may be reduced. As a result, no slippage occurs, and even after assembling, it is reliably located in the seal groove, thereby preventing water leakage into the tunnel.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where the segments are assembled in a ring shape, FIG. 2a is a perspective view showing a partly broken part of a flat steel material for a tunnel lining manufactured according to the present invention, and FIG. FIG. 3a is a perspective view of a state in which a sealing material is adhered to FIG. 2a, and FIG. 3b is a sealing material shown in FIG. 2b. FIG. 4a and FIG. 5a are explanatory diagrams showing the manufacturing method of the present invention, and FIG. 4b and FIG. 5b are explanatory diagrams showing another embodiment of FIG. 4a and FIG. 5a. is there. X ... Segment, 1 ... Skin plate, 2 ... End plate, 3 ... Ring plate, 9 ... Outside flat portion of end plate (ring plate), 10 ... Seal groove, 14 ... Opening, 15 , 16 …… Stripes, 15 ′, 16 ′…
... Seal material retaining piece, 17 ... First mold roll, 17 '...
Second mold roll, 24, 25 ... small notch, 30 ... sealing material.

Claims (1)

(57) [Claims] 1. A method of manufacturing an end plate and a ring plate of a segment from a metal material using a rolling mill, comprising: forming a metal material heated to a high temperature into a strip-shaped flat steel material having a rectangular cross section between rolling rolls; On one flat portion of the strip-shaped flat steel material, a seal groove having a tapered opening is formed by being deviated from the center in the width direction of the strip-shaped flat steel material by pressing the first die roll, and Forming a strip-shaped projection on both ends of the sealing groove in parallel with the sealing groove, and facing the strip-shaped projection to the inside of the opening of the sealing groove by a second die roll. And forming a sealing material locking piece by forming a sealing material locking piece. 4. A method for manufacturing a segment flat steel material for a tunnel lining, comprising: