JPH08326491A - Composite segment - Google Patents

Abstract

PURPOSE: To obtain a reliable welded part which can be easily and rapidly assembled. CONSTITUTION: In a composite segment 12 composed of a skin plate 14 made of a steel plate or a steel plate with protrusions and a support plate members 16 for the earth pressure which are laminated as a unit on one side face of the skin plate 14, in which the skin plate 14 and the earth pressure-support members 16 of the earth pressure are bent to make an arcuate form with the skin plate in the inside, a groove 24 is provided in the ring-to-ring side direction at one end of the piece-to-piece side direction of the earth pressure-support members 16. The protrusions having a shape and size to fit to the groove 24 are provided in the ring-to-ring side direction at the other end of the piece-to- piece side direction of the earth pressure-support members 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite segment used for the primary lining of the inner wall of a shield tunnel, such as a headrace or underground river, to which internal pressure is applied.

[0002]

2. Description of the Related Art FIG. 12 is a schematic perspective view of a shield tunnel formed by using a composite segment, FIG. 13 is a perspective view showing a part of the inner wall of the shield tunnel of FIG. 12, and FIG. 14 is a composite segment before connection. FIG. 15 is a cross-sectional view showing the vicinity of the end portion, and FIG. 15 is a cross-sectional view showing the vicinity of the end portion of the composite segment after being connected.

As shown in these figures, the shield tunnel 10 comprises a large number of composite segments 12 assembled and connected in a tubular shape. However, in FIG. 12, the rear outer cylinder skin plate of the shield 50 is omitted for convenience of drawing.

The composite segment 12 comprises a skin plate 14 made of a steel plate and an earth pressure support member 16 integrally laminated on one surface of the skin plate 14. The earth pressure support member 16 of this example is made of a concrete structure reinforced by reinforcing bars. The skin plate 14 and the earth pressure support member 16 are curved in an arc shape with the skin plate 14 inside so as to form a part of a tunnel.

The skin plate 14 has one end on the side between the pieces of the earth pressure support member 16 (between the adjacent synthetic segments 12, 12 of the synthetic segments 12 connected in a ring shape, and so on) and between the rings (the ring shape). Between the rings of the composite segment 12 connected to each other, and so on) at one end on the side protruding from the earth pressure support member 16
2a.

Further, the skin plate 14 is retracted from the earth pressure support member 16 at the other end of the earth pressure support member 16 on the side between the pieces and the other end on the side of the ring to remove the cutout portion 1.
It is 2b. Further, a steel material 18 having an L-shaped cross section, which serves as a backing metal, is provided on the cutout portion 12b.

Two L-shaped lug pieces 20 are attached to each side of the skin plate 14. The lug piece 20 is provided at a position where adjacent synthetic segments 12, 12 overlap each other when the synthetic segments 12 are assembled in a tunnel shape. The lug piece 20 is provided with a through hole 20a.

Next, a case where the inner wall of the shield tunnel is primarily covered with the above-described composite segment will be described.

First, the shield 50 at the tip of the tunnel is excavated by one segment ring to form a space for one segment ring at the segment assembly position behind the shield 50. Next, the composite segment 12 is assembled in a ring shape in this space.

Here, the adjacent composite segments 12, 1
14, as shown in FIG. 14, the ends are opposed to each other and the protrusions 12a of the other composite segment 12 are overlapped with the cutout parts 12b of the one composite segment 12 so that the ends contact each other. As shown in FIG. 15, the overlapping lug pieces 20, 20 are connected by fastening with bolts and nuts 22.

Next, the synthetic segment 12 assembled in the ring shape in this way is pushed by the jack 52 while the front ground of the shield 50 is being excavated, and the shield 50 is advanced by one segment of one ring. Then, while returning the jack 52 to the shield 50 side sequentially, a new synthetic segment 12 is sequentially assembled next to the synthetic segment 12 assembled in the ring shape in the ring shape in the same manner as described above.

Here, the composite segment 12 to be assembled in the ring shape later is displaced by half a piece in the circumferential direction of the tunnel with respect to the composite segment 12 assembled in the ring shape first. This is because the boundary lines connecting the composite segments 12 and 12 are arranged in a straight line so that a weak portion is not formed in a straight line.

By repeating the above operation, a shield tunnel whose inner wall is covered with the composite segment in a state of being temporarily assembled by the lug piece 20 is formed.

Next, after the completion of the primary lining of the composite segment temporarily assembled by the lug piece 20, the segment is welded. The abutting end portions of the skin plates 14, 14 are welded to each other between the adjacent synthetic segments 12, 12 except for the portion where the lug piece 20 is attached.
Then, the skin plates 14, 14 to the rug piece 20
Is removed, and after that portion is gouged, the abutting end portions of the skin plates 14 and 14 are welded to each other.

[0015]

By the way, when the conventional composite segment 12 described above is assembled in a tunnel, a large number of adjacent lug pieces 20, 20 must be fastened together by bolts and nuts 22, respectively. There is a problem that the assembly work of the segment 12 takes time and effort.

When the skin plates 14 and 14 of the assembled composite segment 12 are welded to each other, the skin plates 14 and 14 must be welded separately before and after the lug piece 20 is removed. Since the lug piece 20 must be removed and the subsequent portion must be gouged, there is a problem that the work is complicated and takes time.

When the skin plates 14, 14 of the assembled composite segment 12 are welded to each other, the skin plate 14 must be welded separately before and after the lug piece 20 is removed. There is a possibility that they may be different, and there is a problem that the reliability of the welded portion is poor.

The present invention has been made to solve these problems, and provides a composite segment which can be assembled easily and in a short time, and which can obtain a highly reliable weld. The purpose is to

[0019]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a skin plate made of a steel plate or a steel plate with protrusions, and a plate-shaped earth pressure support member integrally provided on one surface of the skin plate. In the composite segment in which the skin plate and the earth pressure support member are curved in an arc shape with the skin plate inside, a groove is formed between the rings at one end of the earth pressure support member between the pieces. And a protrusion having a shape and size that fits in the groove is provided at the other end of the earth pressure support member on the side between the pieces in the direction between the rings.

Here, the earth pressure support member may be a concrete structure in which elongated steel plates with protrusions are arranged in the direction between the pieces (segment circumferential direction). Further, a groove is provided in the direction between the pieces at one end of the earth pressure supporting member between the rings,
A ridge having a shape and size that fits in the groove may be provided at the other end of the earth pressure support member on the ring-to-ring side in the inter-piece direction. Further, each of the ends of the earth pressure support member, which are fitted to each other on the ring side and / or the piece side, may be formed of a cast steel plate or a machined shaped steel. The outside of the concrete structure of the earth pressure support member may be covered with a steel plate. In this case, the concrete structure may or may not have a reinforcing material such as a reinforcing bar inside. Furthermore, holes may be provided at the end portions of the earth pressure support member on the ring-to-ring side so that the joint pins can be fitted therein so that the joint pins can be connected.

[0021]

According to the invention described in claims 1 to 7, a groove is provided at one end of the earth pressure support member on the side between the pieces in the inter-ring direction, and a protrusion having a shape and size to be fitted into the groove. Since the strip is provided at the other end of the earth pressure supporting member on the side between the pieces in the inter-ring direction, these synthetic segments are connected to each other by simply engaging the ends of the adjacent synthetic segments.

Further, in the inventions according to claims 1 to 7, since there is no obstacle such as a lug piece in the middle of the skin plate, when the skin plates of adjacent synthetic segments are welded to each other, the lug piece is removed during the welding. You don't have to do something else like gouging or gouging.

Further, in the inventions according to claims 1 to 7, since there is no obstacle such as a lug piece in the middle of the skin plate,
When the skin plates of adjacent synthetic segments are welded to each other, the skin plates can be welded at the same time under the same conditions. In addition, automation of welding work becomes easy.

[0024]

1 is a perspective view showing an embodiment of a composite segment according to the present invention. As shown in the figure, the composite segment 12 according to the present invention comprises a skin plate 14 made of a steel plate, and an earth pressure support member 16 integrally provided on one surface of the skin plate 14 in a laminated manner. The skin plate 14 and the earth pressure support member 16 are curved in an arc shape with the skin plate 14 inside so as to form the inner wall of the tunnel.

The skin plate 14 supports earth pressure at one end of the earth pressure support member 16 between the pieces (upper end in the figure) and one end between the rings (right end in the figure). It projects from the member 16 to form a projection 12a.
Further, the skin plate 14 supports earth pressure at the other end of the earth pressure support member 16 between the pieces (the lower end in the figure) and the other end between the rings (the left end in the figure). It is recessed from the member 16 to form the cutout portion 12b. A backing plate 18 made of a steel plate is provided on the notch 12b.

A groove 24 is provided in the inter-ring direction at one end portion (upper end portion in the figure) on the inter-piece side of the earth pressure support member 16. At the other end of the earth pressure support member 16 between the pieces (the lower end in the figure), a projection 26 having a shape and size that fits into the groove 24 is provided in the inter-ring direction. .

A groove 32 is provided at the one end of the earth pressure support member 16 on the ring-to-ring side (the left end in the figure) in the inter-piece direction. In addition, a protrusion 34 having a shape and size that fits into the groove 32 is provided in the inter-piece direction at the other end of the earth pressure support member 16 between the rings (the right end in the figure). There is.

The earth pressure support member 16 is, as shown in FIG.
It is formed by a concrete structure having reinforcing bars 28 arranged inside. The reinforcing bar 28 and the skin plate are joined by welding.

Next, a case where the inner wall of the shield tunnel is primarily covered with the above-described composite segment will be described.

First, the shield 50 at the front end of the tunnel is dug by one ring segment to form a space for one segment ring at the segment assembly position behind the shield 50. Next, the composite segment 12 is assembled in a ring shape in this space.

Here, the adjacent composite segments 12, 1
If the two end portions are simply brought into contact with each other, the two are fitted as they are, as shown in FIG. Interlocking composite segments 12,
Between 12, the abutting ends of the skin plates 14, 14 are automatically welded by an automatic welding device (not shown) placed immediately after the segment assembly position.

Next, the synthetic segment 12 thus assembled in a ring shape is pushed by the jack 52 while excavating the front ground of the shield 50 to advance the shield 50 by one ring segment. Then, while returning the jack 52 to the shield 50 side in sequence, a new synthetic segment 1 is provided next to the synthetic segment 12 assembled in the ring shape previously.
2 are assembled in a ring shape in the same manner as above. After this,
The skin plates 14, 14 are sequentially welded between the pieces and between the rings by the automatic welding device.

By repeating the above operation, a shield tunnel whose inner wall is covered with the composite segment is formed.

In the above embodiment, the earth pressure support member 16
As the concrete structure in which the reinforcing bars 28 are arranged inside the concrete, as shown in FIG. 4, the reinforcing bars 28 are arranged inside the concrete, and the elongated steel plates 30 with protrusions are arranged in the direction between the pieces. A structure may be used as the earth pressure support member 16. In this case, as shown in FIG. 5, a fixing metal piece 35 may be provided at the end of the elongated steel plate 30 to increase the fixing of the elongated steel plate 30.

Further, although the earth pressure support member 16 is formed of only the concrete structure in the above-mentioned embodiment, as shown in FIG. 6 or 7, the end portions between the pieces and between the rings of the concrete structure are cast. Alternatively, the earth pressure support member 16 may be formed so as to be surrounded by the machined steel material 36. In this case, the fitting state of the composite segment is as shown in FIG.

Further, as shown in FIG. 9, the earth pressure support member 16 may be formed such that the outer surface side of the concrete structure is completely surrounded by the steel plate 37 by welding or bending. In this case, the inside may be reinforced concrete or only concrete. In this case, the fitting state of the composite segment is as shown in FIG.

Further, in the above embodiment, the groove 32 and the ridge 34 are provided at the ring-side end of the earth pressure support member 16 so that the rings can be fitted together. However, as shown in FIG. A hole 38 may be provided at the end portion of the pressure support member 16 on the ring-to-ring side so that the joint pin 40 can fit between the rings of the composite segments 12 and 12.

[0038]

According to the invention described in claims 1 to 7, since the synthetic segments are connected in a ring shape only by fitting the ends of the adjacent synthetic segments to each other, the synthetic segments can be easily formed. And there is an effect that it can be assembled quickly.

According to the invention described in claims 1 to 7,
When the skin plates of adjacent synthetic segments are welded to each other, it is not necessary to perform another work such as removal of the lug piece or gouging during the welding, so the work of welding the skin plates can be performed easily and quickly. There is an effect.

According to the invention described in claims 1 to 7,
Since the assembly work of the composite segment and the welding work of the skin plates are simplified, the assembly by the automatic erector and the automatic welding by the automatic welding device are possible, and the effect that the primary lining work of the composite segment can be fully automated. There is.

According to the invention described in claims 1 to 7,
Since the skin plates of the adjacent synthetic segments can be welded at the same time at the same condition, the quality of the welded portions between the skin plates of the adjacent synthetic segments becomes uniform, and the reliability of the welded portion is improved.

Further, according to the second aspect of the present invention, since the earth pressure support member is made of a concrete structure in which elongated steel plates are arranged in the ring direction, the strength of the tunnel in the circumferential direction is improved. Further, according to the invention described in claims 3 to 7, there is an effect that the composite segment can be easily connected even between the pieces.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a composite segment according to the present invention.

FIG. 2 is a cutaway perspective view showing an example of an internal structure of a composite segment according to the present invention.

FIG. 3 is a cross-sectional view showing a fitted state of the composite segment shown in FIG.

FIG. 4 is a cutaway perspective view showing another example of the composite segment according to the present invention.

FIG. 5 is a perspective view showing a modified example of the composite segment in FIG.

FIG. 6 is a perspective view showing another example of the composite segment according to the present invention.

FIG. 7 is a perspective view showing another example of the composite segment according to the present invention.

FIG. 8 is a cross-sectional view showing a fitted state of the composite segment shown in FIG. 6 or 7.

FIG. 9 is a perspective view showing another example of the composite segment according to the present invention.

FIG. 10 is a cross-sectional view showing a fitted state of the composite segment shown in FIG.

FIG. 11 is a perspective view showing an example in which rings of synthetic segments are connected by pins.

FIG. 12 is a schematic perspective view of a conventional shield tunnel formed by using a composite segment.

FIG. 13 is a perspective view showing a part of an inner wall of a shield tunnel which is primarily covered by a conventional technique.

FIG. 14 is a cross-sectional view showing the vicinity of an end portion of a composite segment according to a conventional technique before being connected.

FIG. 15 is a cross-sectional view showing the vicinity of the end of a composite segment according to the prior art after being connected.

[Explanation of symbols]

 10 Shield Tunnel 12 Composite Segment 12a Projection 12b Missing Part 14 Skin Plate 16 Earth Pressure Supporting Member 18 Backing Metal 24 Groove 26 Projection 28 Rebar 30 Elongated Steel Plate 32 Groove 34 Projection 35 Fixing Metal 36 Steel Material 37 Steel Plate 38 Hole 40 Fitting pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Matsumoto 5-25, Oizumigakuencho, Nerima-ku, Tokyo (72) (72) Inventor Tetsushi Sonoda 2-5-8 Kita-Aoyama, Minato-ku, Tokyo (72) Inventor Hiroshi Toida 6-2 Hamada-cho, Ebina City, Kanagawa Prefecture (72) Inventor Hideaki Nagayama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihonkokankan Co., Ltd. (72) Inventor Rokuro Misawa Kanagawa Prefecture 1-41-11 Kamariya Nishi, Kanazawa-ku, Yokohama-shi

Claims (7)

[Claims] 1. A skin plate made of a steel plate or a steel plate with projections, and a plate-shaped earth pressure support member integrally provided on one surface of the skin plate, the skin plate and the earth pressure support member. In a composite segment curved in an arc shape with the skin plate facing inward, a groove is provided at one end of the earth pressure support member on the side between the pieces in a ring-to-ring direction, and the groove is fitted into the groove. And a ridge having a size is provided at the other end of the earth pressure supporting member on the side between the pieces in the inter-ring direction. 2. The composite segment according to claim 1, wherein the earth pressure support member is made of a concrete structure in which elongated steel plates with protrusions are arranged in the direction between pieces (segment circumferential direction). 3. A groove is provided in a piece-to-piece direction at one end of the earth pressure support member between the rings, and a ridge having a shape and size that fits into the groove is provided between the rings of the earth pressure support member. The composite segment according to claim 1 or 2, wherein the other end on the side is provided in the direction between the pieces. 4. The inter-ring side and / or inter-piece side of the earth pressure support member, which are fitted to each other, are made of a cast steel plate or a machined steel plate. The synthetic segment described. 5. The composite segment according to claim 1, wherein the earth pressure support member is formed by coating a steel plate on the outside of a curved plate-shaped concrete structure. 6. The composite segment according to claim 5, wherein the concrete structure is made of concrete only. 7. The composite segment according to claim 1, wherein the earth pressure support member is provided with a hole at each of the ring-side ends thereof into which a joint pin can be fitted.