JPH10238295A - Steel shell segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly join the axial and circumferential direction parts of a tunel between steel shell segments, and to perfectly carry out the water stopping of the joined part. SOLUTION: A steel shell segment has the rectangular arc-shaped flat front, and is composed of a steel outside flange 12 and a steel inside flange which are joined through a web 3. In this case, the inside diameter side of a side edge thickness part on one side of the first two L-shaped side edge parts and the second two L-shaped side edge parts in the case where the flat rectangular part of both or one flange of an outside and an inside steel flange is bisected by a diagonal is protruded further than an outside diameter side through a stepped part to form a protrusive joined end face. The outside diameter side is formed in a recessed joined end face, and the outside diameter side of the other side edge thickness part is protruded further than the inside diameter side through a stepped part to form a protruded part joined end face, and the inside diameter side is formed in a recessed joined end face, and a fitting groove 4 where a water stopping packing is fitted is provided over the four sides of the flat rectangular part along each recessed joined end face of the first and second two L-shaped sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel shell segment having a steel peripheral frame used for tunnel lining.

[0002]

2. Description of the Related Art Conventionally, as a connecting structure of lining steel shell segments used when excavating a shield tunnel, one disclosed in Japanese Patent Application Laid-Open No. H5-256096 is known.

In the case of the conventional segment connecting structure, the outer flange of the rear steel shell having an H-shaped cross section at the rear end of one of the steel shells to be connected is contracted from front to rear as viewed in the tunnel axial direction. A tapered outer surface that reduces the diameter of the H-shaped section, an inner flange of the rear steel shell having the H-shaped section has a tapered outer surface that decreases in diameter from front to rear, and a front end of the H-shaped section at the front end of the other steel shell that follows. Inside the outer flange of the steel shell, there is provided a tapered inner surface that decreases in diameter from the front to the rear, and the inner flange of the front steel shell having the H-shaped section has a tapered inner surface that reduces the diameter from the front to the rear. Is known.

When connecting the front and rear segments in the axial direction of the tunnel, the outer flange and the inner flange of the rear steel shell segment are fitted to the rear inner flange and the outer flange of the front H-shaped section. doing.

[0005]

In the case of the conventional segment connecting structure, as shown in FIGS. 12 and 13, the inclined surface 29 of the flange 28 of the steel shell segment adjacent in the front-back direction as viewed in the tunnel axial direction. The water-stopping material 30 is provided between the steel shell segments, but the tip of the flange 28 on the fitting side may damage the water-stopping material 30 at the time of fitting. May leak.

[0006] The present invention solves the above-mentioned problems, and completes the water stopping at the joints in the two directions by performing the joining in the tunnel axial direction and the tunnel circumferential direction using a ring-shaped water stopping packing. It is intended to provide a steel shell segment.

[0007]

SUMMARY OF THE INVENTION A steel shell segment according to the present invention has an arcuate front surface and a rectangular flat surface, and includes a steel outer flange and a steel inner flange connected via a web. In the shell segment, a side edge of two sides of a first L-shape when a plane rectangular portion of both or one of the outer and inner steel flanges is diagonally divided into two, and a second L-shape. The inner diameter side of one side edge thick portion of the two side edge portions is made to protrude from the outer diameter side via the step portion to be a projecting joint end surface, and the outer diameter side is a concave portion joint end surface, An outer diameter side of the other side edge thick part is protruded from an inner diameter side through a step portion to form a projection joint end face, and an inner diameter side is a concave joint end face, and the first and second L-shapes 2 are formed. Waterproof packing fits over four sides of a rectangular plane along the joint end surface of each of the dents on the side Characterized structure provided with the fitting groove that. Further, in the present invention, the fitting groove includes the first and second L
The two corners are adjacent to each other with a step on the inner and outer diameter sides at the corners adjacent to each other, and the water-stop packing is displaced toward the inner and outer diameter sides at the step, and the first and second waterproof packings are displaced. The second L
It is characterized in that it is formed on two sides of the shape and extends so as to fit into a fitting groove formed over four sides including the corners of the plane rectangle. According to the present invention, when the steel shell segments are joined in the tunnel axial direction and the tunnel circumferential direction, the protrusions of the side edges of the first and second L-shaped two sides of each of the steel segments disposed opposite to each other. By joining the joint end face and the concave joint end face to each other, each steel shell segment is in the tunnel axial direction,
By tightly engaging not to shift to the inner and outer diameter sides in the tunnel circumferential direction, and furthermore, by waterproof packing of fitting into fitting grooves formed over four sides including corners of a flat rectangle,
The water stopping at both the joints in the axial direction and the circumferential direction of the tunnel of each steel shell segment is perfectly performed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a steel shell segment according to the present invention with a curved convex surface facing upward, FIG. 2 is a plan view of FIG.
FIG. 3 is also a plan view of FIG. 1, in which other components are not shown and the fitting groove (that is, the mounting groove) 4 of the ring-shaped watertight packing 10 which is a main element of the present invention is more clearly shown. FIG. FIG. 4 shows a bottom view of FIG.

FIG. 5 is a sectional view taken along line AA in FIG.
FIG. 8 shows a water-stop structure at a joint portion of the steel shell segments in the tunnel axial direction. FIG. 9 and FIG. 10 show a water stopping structure at a circumferential joining portion of the steel shell segments in the tunnel.

In FIGS. 1 to 3 and FIGS. 6 to 8 which are sectional views taken along the line AA in FIG. 3, the steel shell segment 1 is formed in a circular arc shape made of a pair of front and rear H-beams extending in the circumferential direction of the tunnel. A frame material (outer flange 12 and inner flange 2) and a linear frame material (outer flange 12
a, the inner flange 2a) is fixed by welding to form the steel shell main body 17. A concave portion 16 is provided on the outer surface of the outer flange 12 on each side of the steel shell main body 17, and a skin plate 11 made of a steel plate is fixed to the concave portion 16 by welding, and the outer flanges 12, 12a and the inner flanges 2, 2a are welded. Concrete (reinforcement not shown) 1 in a steel shell body 17 composed of webs 13 and 13a.
4, the steel shell segment 1 is formed. The steel shell segment 1 is provided with an injection pipe 7 for injecting a backfill material such as a backfill mortar.

At one end of the steel shell segment 1 in the axial direction of the tunnel (right side in FIGS. 6 to 8), a steel outer flange 12 projecting forward as viewed in the axial direction of the tunnel has a projection-joining end face 8 and a recess-joining portion. An end surface 9 and an inclined surface 3 connecting between the protruding portion connecting end surface 8 and the concave portion connecting end surface 9 are provided. Further, a packing fitting groove 4 having a substantially semicircular cross section is provided at a base end of the inclined surface 3 on the extension of the inclined surface 3 without causing a cross-sectional defect of the inclined surface 3. A ring-shaped waterproof packing 10 is fitted into the packing fitting groove 4.

The other end of the steel shell segment 1 in the axial direction of the tunnel (the left side in FIGS. 6 to 8) protrudes so as to be symmetrically arranged with each part of the outer flange 12 on the opposite side (the right side in the figure). The connecting surface 8 and the connecting surface 9 of the concave portion, and the inclined surface 3 connecting between the connecting surface 8 of the projecting portion and the connecting surface 9 of the concave portion are provided. As in the case, a packing fitting groove 4 having a substantially semicircular cross section is provided, and a ring-shaped waterproof packing 10 is fitted into the packing fitting groove 4.

In FIGS. 6 to 8, the inner flange 2 of the steel shell segments 1 to be joined to each other is also symmetrically arranged on the left and right sides similarly to the configuration of the outer flange 12, so that the projecting joint end face 8 and the recess are formed. The joining surface 4 is formed by connecting the projecting joining surface 8 and the recess joining surface 9 to each other, and the packing fitting groove 4 formed at the base end of the inclined surface 3 and having a substantially semicircular cross section. Provided as in the previous case,
In this packing fitting groove 4, a ring-shaped waterproof packing 10
Is fitted.

Next, in FIGS. 1 to 3 and FIGS. 9 and 10, which are sectional views taken along the line BB of FIG. 3, one end of the steel shell segment 1 in the circumferential direction of the tunnel (right side in FIGS. 9 to 10) )
In the steel outer flange 12a protruding forward as viewed in the axial direction of the tunnel, a projecting portion joining end surface 8a and a concave portion joining end surface 9a, and a slope connecting between the projecting portion joining end surface 8a and the concave portion joining end surface 9a. A surface 3a is provided, and
A packing fitting groove 4 having a substantially semicircular cross section is provided at the base end of the inclined surface 3a in the same manner as described above, and a ring-shaped waterproof packing 10 is fitted into the packing fitting groove 4.

The other end of the steel shell segment 1 in the axial direction of the tunnel (the left part in FIGS. 9 and 10) is symmetrically arranged with each part of the outer flange 12a on the opposite side (the right part in the figure). Projection end face 8a and recess end face 9
a and an inclined surface 3a connecting between the projecting joint end surface 8a and the concave joint end surface 9a.
A packing fitting groove 4 having a substantially semicircular cross-section is provided at the base end portion a in the same manner as described above, and a ring-shaped waterproof packing 10 is fitted into the packing fitting groove 4.

Further, in FIGS. 6 to 8, the inner flange 2a of the steel shell segments 1 to be joined to each other is also symmetrically arranged on the left and right sides similarly to the configuration of the outer flange 12a. Joint end face 9a
An inclined surface 3a connecting the projecting portion joining end surface 8a and the concave portion joining end surface 9a; and a packing fitting groove 4 having a substantially semicircular cross section formed at the base end of the inclined surface 3a. A ring-shaped waterproof packing 10 is fitted in the packing fitting groove 4.

To join the steel shell segments 1 in the axial direction of the tunnel, as shown in FIG. 6, the inner flange 2 and the outer flange 12 of each segment to be joined are brought close to each other using the respective inclined surfaces 3 as guides. . In this manner, when the protruding portion joining end face 8 and the recessed portion joining end face 9 of each flange come close to or come into contact with each other and the inclined surfaces 3 come close to or come into contact with each other, as shown in FIG.
Are deformed by being pushed by the joint end faces 8 of the respective projecting portions, so that the joint gap between the pair of inner flanges 2 facing each other in the tunnel axial direction and the joint gap between the outer flanges 12 are sealed in a watertight manner. The water stoppage of the joint is perfect.

A space 5 (shown in FIG. 7) formed between the webs 13 of the steel shell segments 1 joined as described above.
Is filled with a room temperature curable material 18 such as mortar.
FIG. 8 shows a pipe 6 for injecting the hardening material 18 into the space 5.

In order to join the steel shell segments 1 in the circumferential direction of the tunnel, similarly to the case of joining in the axial direction of the tunnel, as shown in FIG. And the outer flange 12a are brought close to each other using the respective inclined surfaces 3a as guides. Thus, the protruding portion connecting end surface 8a and the concave portion connecting end surface 9 of each flange are provided.
a, and when each inclined surface 3a approaches or comes into contact with each other, as shown in FIG.
0 is deformed by being pushed by each projection joint end face 8a,
The joint gap between the pair of inner flanges 2a facing each other in the circumferential direction of the tunnel and the joint gap between the outer flanges 12a are water-tightly sealed, and the waterproofness of the joint between the two flanges is perfect. The space formed between the webs 13a of the steel shell segments 1 joined as described above is filled with a cold-setting material 18a such as mortar.

As described above, in the embodiment of the present invention, the joint portion of the steel shell segment 1 in the tunnel axial direction and the joint portion of the steel shell segment 1 in the circumferential direction of the tunnel are formed by the projecting joint end surfaces 8 and 8a and the concave joint end surface 9 respectively. , 9a and water-tightly joined via a ring-shaped waterproof packing 10 stably fitted and held in the packing fitting groove 4 formed in the recessed joint end surfaces 9, 9a. The waterproof structure of the flange joint is perfect.

The ring-shaped waterproof packing 10 is shown in FIG.
As shown in the enlarged view of the figure, a projecting piece 21 having a ridge 22 on the side face is integrally provided integrally with a body having a circular cross section, and the projecting piece 21 is applied to the recessed joint end face 9 to obtain a segment. The waterproofness of the joint surface is further improved. Further, as the water-swellable water-stopping material constituting the packing 10, for example, a specially modified rubber-based water-swellable water-stopping material made of natural rubber and urethane, or a surface of the water-swelling water-stopping material, It is preferable to use one coated with a lubricant comprising an acid amide-based weak anionic surfactant. Further, as a means for forming the ring-shaped water-stop packing 10, a linear packing material may be fixed along the packing fitting groove 4 with an adhesive to form a ring or a closed loop.

The steel shell segment 1 according to the present embodiment is assumed to be used, for example, as a shell of a water storage tunnel or a high-pressure gas storage tunnel. Since a pressure load such as atmospheric pressure is applied, the joint structure between the steel shell segments 1 in the circumferential direction of the tunnel needs to be strengthened together with the above-described waterproof structure at the junction in the axial direction of the tunnel, and the joining operation is simple and easy. A structure that can be performed reliably is desirable.

The joint structure between the steel shell segments 1 in the circumferential direction of the tunnel between the steel shell segments 1 according to the present embodiment is as shown in FIGS. First, a steel shell segment 1 shown in FIG. 1 is shown in a perspective view of a single steel shell segment 1 as viewed from above with its arc portion protruding upward.
Hook-shaped protrusions 1 on the male side at the diagonal corners of the square
9 and two female-side engaging holes 20 are provided in the radial direction when viewed from the center of the arc, respectively.

That is, the female side engaging holes 20 are formed in the plate members 20a provided on the webs 13a at both ends in the circumferential direction of the steel shell segment 1.

Further, the base ends of the above-mentioned male hook-like projections 19 are fixed to the webs 13 at both ends in the circumferential direction of the steel shell segment 1, and the tip end of this hook-like projection 19 is connected to the tunnel shaft. A little business trip from web 13 in the direction.

In the joint structure between the segments, the hook-shaped projections 19 are engaged by bringing the adjacent steel shell segments 1, 1 to be joined in the circumferential direction of the tunnel closer to each other and moving in the axial direction of the tunnel. It fits into the hole 20, whereby the steel shell segments 1, 1 in the circumferential direction are firmly connected,
Even if a strong water pressure or pressure such as atmospheric pressure is applied from the inside or outside, the joint between the steel shell segments 1 can maintain the nectarity and sufficiently withstand the pressure.

Further, a steel shell segment 1 assembled into a ring
Any conventionally known arbitrary means may be used as the joint means in the tunnel axial direction. For example, a joint means in which male and female engaging members are engaged with each other as disclosed in Japanese Patent Application Laid-Open No. H5-256096 may be used. I just need. FIG. 11 shows a segment lining 27 using the joint means, and 25 is a male engaging member. In FIGS. 2 and 3, reference numeral 26 denotes a female engaging member.

[0028]

According to the present invention, there is provided a steel shell segment having an arcuate front surface and a rectangular flat surface and comprising a steel outer flange and a steel inner flange connected via a web. Of the inner steel flanges, the side edges of the first L-shaped two sides and the side edges of the second L-shaped two sides when the plane rectangular portion of both or one of the flanges is bisected diagonally. While making the inside diameter side of one side edge thick part protrude from the outside diameter side through the step part, it becomes a protruding joint end face,
The outer diameter side is a concave joint end face, the outer diameter side of the other side edge thick part is protruded from the inner diameter side via a step portion to be a protruded joint end face, and the inner diameter side is a concave joint end face. 4 along the joint end faces of the recesses on the two sides of the first and second L-shapes.
Since the fitting groove into which the water-stop packing is fitted is provided along the sides, the projecting joint end faces 8, 8a of the segment flanges of the steel shell segment 1 at the front and rear portions in the tunnel axial direction and at the front and rear portions in the circumferential direction of the tunnel are recessed. The steel shell segments 1 can be strongly connected to each other by fitting with the joining end surfaces 9 and 9a. Of course, in the present invention, between the steel shell segments 1 in the tunnel axial direction and the tunnel circumferential direction, When a pressure load such as water pressure or air pressure is applied from the inside or outside of the segment, it includes the corners of the plane rectangle of the steel shell segment.
The leakage is reliably prevented by the waterproof packing fitted into the fitting groove 4 formed on the side. When the water-stop packing is formed in a ring shape, the water-stop packing can be easily and surely fitted into the packing fitting grooves 4 provided on the four sides of the flat rectangular steel shell segment. Workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a steel shell segment according to the present invention, with an arc-shaped convex portion facing upward.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of the segment for showing a ring-shaped water-stop packing fitting groove formed on four sides of the steel shell segment, which is further omitted from FIG. 2;

FIG. 4 is a bottom view of the steel shell segment of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a cross-sectional view showing a state in which joints of a pair of steel shell segments are opposed to each other to join steel shell segments adjacent to each other in the tunnel axial direction.

FIG. 7 is a cross-sectional view showing a state where the steel shell segments of FIG. 6 are joined in a tunnel axial direction.

FIG. 8 is a cross-sectional view showing a state in which mortar is filled in a gap between steel shell segments joined in the tunnel axial direction in FIG.

FIG. 9 is a sectional view taken along line BB of FIG. 3;

FIG. 10 is a sectional view of a joining portion of a steel shell segment in a tunnel circumferential direction.

FIG. 11 is a perspective view of a segment lining according to the present invention.

FIG. 12 is a partial cross-sectional view showing a conventional example, and showing a state immediately before fitting of joint portions of steel shell segments facing each other in the tunnel axial direction.

13 is a cross-sectional view showing a state at the time of fitting of the joining portion in FIG.

DESCRIPTION OF SYMBOLS 1 Steel shell segment 2 Inner flange 3 Inclined surface 4 Packing fitting groove 5 Space 6 Pipe 7 Injection pipe 8 Projection joint end face 9 Depression joint end face 10 Ring-shaped waterproof packing 11 Skin plate 12 Outside flange 13 Web 14 Concrete 15 Projection piece 16 Concave part 17 Steel shell main body 18 Room temperature hardening material 19 Hook-shaped projection 20 Engagement hole 21 Projection piece 22 Projection 24 Support frame 25 Male side engagement member 26 Female side engagement member 27 Segment lining 28 Flange 29 Slope 30 Waterproof material

Claims (3)

[Claims] 1. A steel shell segment comprising a steel outer flange and a steel inner flange connected to each other by a web and having an arcuate front surface and a rectangular flat surface, wherein said outer and inner steel flanges are connected to each other. The first L in the case where the plane rectangular portion of both or one of the flanges is bisected by a diagonal line
Of the side edges of the two sides of the second L-shape and the side edges of the two sides of the second L-shape, the inner diameter side of one side edge thick portion is protruded from the outer diameter side via the step portion so as to project and join. The outer diameter side is a concave joint end face, and the outer diameter side of the other side edge thick portion is made to protrude from the inner diameter side through a step portion, and the protruding part joint end face is used, and the inner diameter side is The first and second L
A steel shell segment having a configuration in which a fitting groove into which a water-stop packing is fitted is provided along four sides of a flat rectangular shape along each joint end face of each of the two sides of the shape. 2. The fitting groove is provided adjacent to the corner portion where the first and second L-shaped two sides are adjacent to each other with a stepped portion on the inner and outer diameter sides. In the stepped portion, fitting is performed in fitting grooves formed on the two sides of the first and second L-shapes and shifted on the inner and outer diameter sides and formed on four sides including corners of a flat rectangular shape. 2. The steel shell segment according to claim 1, wherein the steel shell segment is configured to extend. 3. Each of the protrusions has a tapered cross-section on the outer surface of the joint end surface on the inner diameter side and the inner surface of the joint end surface on the outer diameter side of the first and second L-shaped two sides. The steel shell segment according to claim 1 or 2, wherein the inclined surface is formed as described above.