JP2000120392A - Angular segment for shield tunnel, and shield covering work tunnel covering work using molded form thereof and the segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angular segment for shield tunnel easy in the form manufacture including forms of miscellaneous shapes, and capable of commonly using the same form for the segment forming of different diameter shield tunnel, not requiring many members for the connecting parts, low in the manufacturing cost of the segment, and easy in the automatization of covering assembly by means of segments at the time of execution of work, and to provide the shield tunnel covering using the molded form thereof and the segments. SOLUTION: Angular segments having segment bodies of nearly angular shape in section in which adjacent two faces 10a, 10b in the tunnel covering outer circumferential surface of a polygonal section are situated in the respective outer surface sides, and integrally provided with the recessed/projected fitting parts for hinge connection to the interpiece connecting end surfaces on the covering circumferential direction of the segment body are used, and the covering 1 is assembled as hinge connections in which the recessed/projected fitting parts of the interpiece connecting parts in the covering circumferential directions of respective segments 2, 3a, 3b, 4 are fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular segment used for lining a shield tunnel whose outer peripheral surface has a polygonal cross section, a molding form thereof, and a shield tunnel lining using the segment.

[0002]

2. Description of the Related Art In general, a shield tunnel is formed by assembling circular arc-shaped segments obtained by dividing a lining shape having a circular cross section into a plurality of pieces in a rear end portion of a shield machine, and sequentially extending a circular ring-shaped lining. In response to this, a shield excavator is propelled.

The conventional segment used in this type of shield tunnel has a circular arc shape, and is a circumferential joint of the lining, that is, a piece-to-piece joint, and a tunnel of a lining ring that is extended for each excavation process. The connection on the axial side, that is, the connection between the rings is performed by a rigid connection using a bolt and a nut.

[0004] When assembling the lining, the final insertion segment to be assembled last to complete the ring shape is designed so that the angle between the joining end faces between the pieces at both ends and the inner surface side can be inserted from the center direction side of the tunnel. A so-called K segment having an expanded shape is used.

[0005]

When manufacturing such a conventional shield tunnel segment, each joint end face between the pieces and the ring is formed by a template accurately framed to form an arc-shaped inner segment. Since the concrete is cast with the peripheral surface or the outer peripheral surface facing upward and the upper arcuate surface is iron-finished by the operator, skill is required for iron finishing work, and securing skilled workers becomes difficult. However, there is a problem that the working cost is increased.

[0006] Further, since the radius of curvature is different in shield tunnels having different diameters, it is necessary to manufacture a separate segment forming form each time. Generally, the accuracy required for this type of segment is the same as that of ordinary concrete. Since it is extremely high and arc-shaped compared to the product, there is a problem that a great cost is required for its manufacture.

Further, when a shield tunnel is to be constructed in a curved line, it is necessary to form various types of irregularly shaped segments obtained by dividing the shield tunnel in accordance with the lining shape. When forming a mold, there is a problem that the number of combined portions between the curved surfaces increases and a high level of manufacturing technology is required, so that the manufacturing cost becomes extremely high.

Further, in the conventional shield tunnel, since the joint between the rings and the pieces is connected by bolts, a lot of metal fittings are required for the connection, and manual work at the time of assembling is difficult and automatic assembling is difficult. There is also a problem that the cost is increased because it is necessary to insert-mold an anchor nut and a pipe for forming a bolt insertion hole with high precision.

In view of the above-mentioned problems, the present invention makes it easy to manufacture a mold including a mold for a deformed segment, and can use the same mold for segment molding of shield tunnels having different diameters. Does not require much metal fittings,
The object of the present invention is to provide a rectangular segment for a shield tunnel, in which the manufacturing cost of the segment is low, and automation of lining assembly by the segment at the time of construction is easy, a forming form thereof, and a shield tunnel lining using the segment. It is a thing.

[0010]

The feature of the rectangular segment for a shield tunnel according to the present invention, which solves the above-mentioned conventional problems and achieves the intended object, is that of a polygonal cross-section outer periphery of a tunnel lining. A segment body having a substantially mountain-shaped cross section having two surfaces adjacent to each other on the outer surface side of the surface, and a concave-convex fitting portion for hinge connection is provided on a joint end face between the pieces on the lining circumferential side of the segment body. I was prepared for it.

A reinforcing metal fitting for hinge connection integrally having a groove-shaped concave fitting portion on the joint end face between the pieces, and a hinge-fitting reinforcement having a convex fitting portion integrally formed with the concave fitting portion. It is preferable to embed a metal fitting and to provide a projection and a projection fitting hole for coupling between rings on the joint end face between rings on the tunnel axial direction side of the segment body.

A feature of the rectangular segment forming mold for a shield tunnel according to the present invention is that a cross section having two adjacent outer surfaces of a tunnel lining having a polygonal cross section on the outer surface side has a substantially mountain shape. A bottom template for forming the inner side surface of the lining of the segment body; a pair of side templates for standing on both sides of the bottom template to form a joint surface between the rings on both sides of the segment body; And an end face template for forming a joint surface between pieces, which is located between both side face templates on both end portions of the sheet and can be changed in position along the bottom face template.

Further, a feature of the shield tunnel lining using the rectangular segments according to the present invention is that the outer peripheral surface has a polygonal shape and is assembled in a ring shape by a plurality of segments. A plurality of concrete segments each having two sides adjacent to each other in a rectangular shape and having joint surfaces between pieces at both ends formed at an angle in a lining radial direction are assembled by hinge connection with each other.

It is preferable that the final insertion segment and the final insertion segment insertion space in each segment are tapered so that the face side is wide and the well side is narrow.

[0015]

Embodiments of the present invention will now be described with reference to the drawings.

1 and 2 show a polygonal tunnel lining embodying the present invention. As shown in FIG. 1, this lining 1 has an outer shape formed into a regular decagon, and has four types of square segments, that is, three ordinary segments 2 and two final connecting recess segments 3a and 3b. Each ring 1a, 1a,... Is assembled by one final connecting segment 4.

As shown in FIGS. 3 and 4, the ordinary type segment 2 has two adjacent flat surfaces 10a,
It is formed in a mountain shape integrally having flat plate-like portions 11a and 11b having an outer surface side with 10b.
Are the lengths constituting the entire length of one side of the polygon of the lining outer surface.

The final connecting concave portion segment 3a is shown in FIG.
As shown in FIG. 6, similarly to the above-described segment 2, the outer surface of the lining 1 is formed in a mountain shape integrally having flat portions 11 a and 11 b having two adjacent flat surfaces 10 a and 10 b on the outer surface side. But one of the flat portions 11
While the length of b is a length constituting the entire length of one side of the polygon of the lining outer surface, the length of the other flat plate portion 11a is substantially half the length of the one side, The well 11a is longer on the wellhead side than on the face side.

The other segment 3 for the final connection concave portion
As shown in FIGS. 1 and 2, b is formed in a shape symmetrical to the segment 3a, and the final connecting segment insertion space a formed between the two segments 3a, 3b has a wider face. I have.

The final insertion segment 4 is the space a
The lining ring 1a is completed by inserting the lining 1 into two flat surfaces 10a and 10b adjacent to each other on the outer peripheral surface of the lining 1 as shown in FIGS. The flat plate portions 11a and 11b are integrally formed in a chevron shape.
Are approximately half the length of one side of the outer surface of the lining, and the flat face sides of the flat portions 11a and 11b are formed widely.

Each of the segments 2, 3a, 3b, 4 has a flat R-shaped portion 22 formed on the inner surface side of the mountain-shaped ridge portion 21. Piece-to-piece joint surfaces 23a, 23b at both ends
Are formed at the same angle as the radial direction of the lining 1,
On one piece joining surface 23a, at the center in the thickness direction,
A groove-shaped concave fitting portion 24 is formed in the segment width direction, and the concave fitting portion 2 is formed on the other inter-piece joint surface 23b.
A convex fitting portion 25 having a shape that fits into the projection 4 is integrally provided.

The concave fitting part 24 and the convex fitting part 25 are partially constituted by insert fittings 26 and 27, respectively. 9 and FIG.
As shown in FIG. 2, a cross member 28 formed integrally with a concave fitting portion 24 or a convex fitting portion 25 on the front surface, and an anchor 29 on the rear surface.
Are projected in a T-shaped arrangement.

Incidentally, the entire concave / convex fitting portion may be constituted by the insert fittings 26 and 27.
9 may be provided in plural for each metal fitting.

One inter-ring joint surface 30 of each segment
a are provided with connecting projections 31, 31,..., and the other inter-ring joint surface 30b is provided with projection fitting holes 32, 32,. Each of these projections 31 and holes 32 is formed by embedding a metal fitting in a segment.

Further, the respective joining surfaces 23 of the respective segments
The grooves a, 23b, 26a, and 26b for fitting the sealing material are formed in a mutually continuous arrangement.

In manufacturing each segment configured as described above, a mold 40 shown in FIGS. 11 and 12 is used. This formwork includes a bottom template 41 for molding the inner surface side of the segment, side templates 42 and 42 standing on both sides to form a joint surface between segment rings, and a bottom template 4.
1 is installed between both side templates 42, 42 on the upper surface of both ends,
End face template 4 for forming a joint surface between both pieces of a segment
3, 43.

The end face plates 43, 43 are installed so that they can be used interchangeably and their installation positions and angles can be changed. The positions of the end face templates 43, 43 are indicated by dashed lines in FIG. By changing the shape along the inclination of the bottom template 41, the flat plate upper portions 11a,
The length of 11b is changed so that the same mold can be used to form lining segments having different diameters. In addition, as shown by a two-dot chain line in FIG. 12, the end faces 43a having different lengths are used for oblique arrangement, and by selecting the positions, the above-described four types of segments 2,
3a, 3b and 4 can be manufactured in a common mold.

The assembling of the lining using these various segments is performed by using the same assembling apparatus as in the prior art, and as shown in FIGS. After fitting the parts 24 and 25 together to form a hinge connection, and assembling the two segments 3a and 3b for the final connection concave portions, the final insertion segment 4 is
The ring is moved from the lining outer surface height position in the lining axis direction and inserted into the final connecting segment insertion space a between the final connecting concave portion segments 3a, 3b, thereby completing the assembly of one ring.

Incidentally, between the rings 1a, 1a, one side of the polygon of the outer periphery of the lining is positioned so that the ridge of the segment of the ring to be assembled later is located at the joint between the pieces of the previously assembled ring. The two rings 1a, 1
The connection protrusion 31 is inserted into the protrusion fitting hole 32 and connected between the portions a.

In the present invention, each segment does not necessarily need the R portion 22 on the inner surface side. In the invention according to claim 5, as shown in FIG. May be assembled.

[0031]

As described above, the shield tunnel segment according to the present invention has a segment body having a substantially mountain-shaped cross section having two adjacent surfaces on the outer surface of the polygonal cross section of the tunnel lining. Then, by forming a rectangular shape integrally provided with a concave and convex fitting portion for hinge connection on the joint end face between the pieces on the lining circumferential side of the segment main body, the segment forming mold is a combination of flat surfaces, Design and manufacturing are easier.

In addition, the design and manufacture of the deformed segments required for the curved construction of the shield tunnel are significantly simplified as compared with the related art.

Also, in the segment forming operation,
The work can be done without skill because the trowel finish only requires a flat surface and does not require a curved surface finish.

Further, a hinge-fitting reinforcement fitting integrally having a groove-shaped concave fitting portion on the joint end face between the pieces, and a hinge-fitting reinforcement having a convex fitting portion integrally formed with the concave fitting portion are formed. By embedding the metal fitting, the strength of the hinge joint is increased, and a highly reliable lining can be assembled.

Further, the above-mentioned hinge connection structure is provided by providing a connection between the rings by providing a protrusion for connecting the rings and a protrusion fitting hole on the joint end face between the rings on the tunnel axial direction side of the segment body. In conjunction with this, the number of members for connection is reduced, and manual work such as screwing is not required, and automatic assembly by a robot is facilitated.

Further, in the formwork of the present invention, the inner side surface of the lining of the segment main body having a substantially mountain-shaped cross section having two mutually adjacent outer peripheral surfaces of the tunnel lining outer surface having a polygonal cross section is formed. A bottom template, a pair of side templates formed on both sides of the bottom template to form a joint surface between the rings on both sides of the segment body, and a pair of side templates on both ends of the bottom template. With the end face template for forming the joint surface between pieces, the position of which can be changed along the bottom face template, the cover of various diameters can be formed only by changing the position of the end face template. Therefore, the cost required for manufacturing the form can be significantly reduced.

In the shield tunnel lining using the rectangular segments according to the present invention, the use of the above-described rectangular segments reduces the cost required for the segments and facilitates the automation of assembly. The overall cost can be reduced, and the final insertion segment insertion space formed by the final insertion segment in each segment and the segments on both sides of the segment is tapered on the face side and narrow on the wellhead side. The surface can be oriented in the radial direction of the lining, and even if the joint between the pieces is formed as a hinge structure, it can sufficiently withstand ambient pressure in the ground.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a shield tunnel lining according to the present invention.

FIG. 2 is a partially developed plan view of the same.

FIG. 3 is a side view of an example of a rectangular segment according to the present invention.

FIG. 4 is a bottom view of the same.

FIG. 5 is a side view of another example of the rectangular segment according to the present invention.

FIG. 6 is a bottom view of the above.

FIG. 7 is a side view of still another example of the rectangular segment according to the present invention.

FIG. 8 is a bottom view of the above.

FIGS. 9A and 9B are plan views showing one reinforcing metal fitting of a hinge connecting portion used in the segment of the present invention, and FIG.
Is a front view, and (C) is a side view.

FIG. 10 is a plan view showing the other reinforcing metal fitting of the hinge connection portion used for the segment of the present invention,
(B) is a front view, (C) is a side view.

FIG. 11 is a longitudinal sectional view of an example of a mold according to the present invention.

FIG. 12 is a plan view of the same.

FIG. 13 is a partially enlarged cross-sectional view illustrating an example of a hinge coupling portion according to the present invention.

FIG. 14 is a front view showing another example of the shield tunnel lining according to the present invention.

[Explanation of symbols]

 a Final segment insertion space 1 Lining 1a Ring 2 Normal type segment 3a, 3b Final connection concave segment 4 Final insertion segment 10a, 10b Plane 11a, 11b Flat plate 21 Ridge 22 R 23a, 23b Joint between pieces 24 Recessed fitting part 25 Convex fitting part 26, 27 Insert fitting 28 Cross member 29 Anchor 30a, 30b Joint face between rings 31 Connecting projection 32 Projection fitting hole 33 Depressed groove 40 Form 41 Bottom template 42 Side template 43 End face template 43a End face template

Claims (6)

[Claims] An outer surface of a polygonal cross section of a tunnel lining outer peripheral surface has a segment body having a substantially mountain-shaped cross section, and a piece of the segment body in a lining circumferential direction of the segment body. A rectangular segment for a shield tunnel, which is integrally provided with a concave-convex fitting portion for hinge connection on an end surface of the joint. 2. A hinge-fitting reinforcing member integrally having a groove-shaped concave fitting portion on a joint end face between pieces, and a hinge-fitting reinforcement having a convex fitting portion integrally formed with the concave fitting portion. 2. The rectangular segment for a shield tunnel according to claim 1, wherein a metal fitting is embedded. 3. The rectangular segment for a shield tunnel according to claim 1, wherein a projection for coupling between the rings and a projection fitting hole are provided on a joint end face between the rings on the tunnel axial direction side of the segment body. 4. A bottom mold plate for forming a lining inner side surface of a segment body having a substantially mountain-shaped cross section having two mutually adjacent outer peripheral surfaces of a tunnel lining outer peripheral surface having a polygonal cross section, and the bottom surface A pair of side stencils which are raised on both sides of the template to form a joint surface between the rings on both sides of the segment body, and between the side stencils on both ends of the bottom stencil, the position of which is the bottom mold. A rectangular segment forming mold for a shield tunnel, comprising: an end face template for forming a piece-to-piece joint surface, which can be changed along the plate. 5. A shield tunnel lining in which an outer peripheral surface has a polygonal shape and is assembled in a ring shape by a plurality of segments, wherein two sides adjacent to each other of the polygon are integrally formed, and pieces at both ends of each of the polygonal shapes are provided. A plurality of concrete segments formed with a lining radial angle at the joint surface
Shield tunnel lining using square segments assembled by hinged connection with each other. 6. The shield tunnel lining according to claim 5, wherein a final insertion segment and a final insertion segment insertion space in each segment are formed in a tapered shape having a wide face and a narrow wellhead side.