JP2006138175A - Adjusting segment for shield tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adjusting segment for a tunnel, which enables segments to be connected and fixed while securing water sealing performance as desired, even in the case of the segments whose sealing groove parts formed in butt surfaces are, for example, different in radius of curvature or width from each other. <P>SOLUTION: This adjusting segment S3 for a shield tunnel is used for adjustment between the butt surfaces 2 and 4 of both the segments S1 and S2 in a state wherein the first and second segments S1 and S2 have the sealing groove parts 3a, 3b, 5a and 5b different in the radius of curvature or the width; a first sealing groove part corresponding to the sealing groove parts 3a and 3b of the first segment S1 is provided; a second sealing groove part corresponding to the sealing groove parts 5a and 5b of the second segment S2 is provided; and the first and second groove parts continue into each other via an adjusting groove part around the adjusting segment S3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, the first segment installed on one side along the tunnel axial direction and the second segment installed on the other side have sealing grooves having different curvature radii or widths. The present invention relates to an adjustment segment for a shield tunnel that is installed between a first segment and a second segment and is used for adjustment between the butting surfaces of the first segment and the second segment.

For example, in the case of a shield tunnel for a subway, concrete segments are used below roads where relatively heavy loads are not used, and cast iron segments with excellent strength are used below buildings where heavy loads are applied. Often done. In that case, the curvature radius or width of the seal groove is often different between concrete segments and cast iron segments due to differences in segment characteristics and differences in joint structure, especially when both segments have different inner diameters. The difference is remarkable, and an adjustment segment is required for adjustment between the butt surfaces of both segments.
As such an adjustment segment that connects different segments, for example, an adjustment segment for a shield tunnel that connects a concrete segment having a relatively small inner diameter and a cast iron segment having a relatively large inner diameter is known (for example, Patent Document 1).

JP-A-8-218785

However, the adjustment segment for the shield tunnel disclosed in the above publication relates to the uneven shape on the butt surface of the concrete segment and the cast iron segment, and no special consideration is given to the sealing groove formed on the butt surface. .
That is, it is indispensable to provide a sealing groove portion for inserting the sealing material around the shield tunnel segment in order to ensure the water stop performance between the abutting surfaces of the adjacent segments. However, in the conventional adjustment segment for the shield tunnel, no special consideration is given to the sealing groove formed on the butt surface, and, for example, it is formed on the butt surface of the concrete segment and the cast iron segment. It was assumed that the sealing groove has substantially the same radius of curvature, that is, the sealing groove having the same radius around the tunnel axis, and the width of the sealing groove is substantially the same.
Therefore, for example, when the sealing groove portions formed on the butting surfaces have different curvature radii or widths, the sealing material is not completely continuous.

Specifically, as shown in the comparative example of FIG. 4, for example, the sealing grooves 14a and 14b of the adjustment segment S3 correspond to the sealing grooves 5a and 5b of the cast iron segment S2 which is the second segment. When formed, the sealing groove portions 14a and 14b do not correspond to the sealing groove portions 3a and 3b of the concrete segment S1 which is the first segment, and therefore, the sealing groove portions 14a and 14b of the adjustment segment S3 and the concrete groove portion are made. The sealing material 13 inserted into the sealing groove portions 3a and 3b of the segment S1 is not completely in contact with each other, so that the water blocking property of the shield tunnel T is hindered.
Conversely, when the sealing groove portions 14a and 14b of the adjustment segment S3 are formed so as to correspond to the sealing groove portions 3a and 3b of the concrete segment S1, the sealing groove portions 5a and 5b of the cast iron segment S2 correspond to the sealing groove portions 5a and 5b. In any case, it is impossible to construct a shield tunnel T excellent in water-stopping property.

  The present invention pays attention to such a conventional problem, and its purpose is to obtain a desired groove even if the sealing groove formed on the butt surface is, for example, segments having different curvature radii or widths. It is to provide an adjustment segment for a tunnel that can be connected and fixed while ensuring the same water stopping performance.

  The first characteristic configuration of the present invention is that the first segment installed on one side and the second segment installed on the other side along the tunnel axial direction have different curvature radii or widths. An adjustment segment for a shield tunnel that is installed between the first segment and the second segment and is used for adjustment between the abutting surfaces of the first segment and the second segment. The first segment groove corresponding to the seal groove formed on the butting surface of the first segment is provided on the butting surface to the first segment, and corresponds to the seal groove formed on the butting surface of the second segment. A second sealing groove is provided on the abutting surface to the second segment, and the first sealing groove and the second sealing groove are arranged around the adjustment segment. It is in place which is configured to continuously each other through.

According to the first characteristic configuration of the present invention, the adjustment segment used for adjustment between the abutting surfaces of the first and second segments having seal grooves having different curvature radii or widths is the abutting surface of the first segment. The first sealing groove portion corresponding to the sealing groove portion formed on the second segment is provided on the abutting surface to the first segment, and the second sealing groove portion corresponding to the sealing groove portion formed on the abutting surface of the second segment is the second portion. Since the first and second segments having seal grooves having different radii of curvature or width are provided on the abutting surfaces to the segments, a desired stop is provided between the abutting surfaces by the intervention of the adjusting segments. The water performance can be secured and connected and fixed.
The first sealing groove and the second sealing groove provided in the adjustment segment are configured to be continuous with each other through the adjustment groove around the adjustment segment. As a result, it is possible to construct a tunnel having excellent water-stopping performance using the first and second segments having sealing grooves having different radii of curvature or widths. .

  According to a second characteristic configuration of the present invention, the adjustment segment is configured such that an outer peripheral diameter thereof substantially coincides with an outer peripheral diameter of the first and second segments having the same outer peripheral diameter. And a taper surface facing inward is formed on the abutting surface side of the thick first segment, the thickness of the first segment being the same as the thickness of the first segment. It is in the place where it is constituted so that it may almost coincide with the thickness of the segment.

According to the second characteristic configuration of the present invention, in the adjustment segment, the outer peripheral diameter is configured to substantially match the outer peripheral diameter of the first and second segments having the same outer peripheral diameter, and the wall thickness thereof is A taper surface facing inward is formed on the abutting surface side to the thick first segment, and is configured to substantially match the thickness of the thin second segment. Since it is configured to substantially match the thickness of one segment, the difference in thickness between the first segment and the second segment is eliminated by the tapered surface formed in the adjustment segment.
As a result, the force is transmitted in the direction of the tunnel axis between the first and second segments having different wall thicknesses by the intervention of the adjusting segment. For example, the pressing force due to the extension of the jack provided in the excavator is ensured. It is possible to reliably excavate the excavator by the reaction force.

An embodiment of an adjustment segment for a shield tunnel according to the present invention will be described with reference to the drawings.
Since the load conditions acting on the tunnel differ depending on the section of the shield tunnel, as shown in FIG. 1, as the shield tunnel segment, for example, a concrete segment S1 as the first segment and a metal as the second segment Two or more types of segments are used, such as a segment made of ductile iron (hereinafter referred to as a cast iron segment) S2, which is excellent in strength.

Each of the concrete segment S1 and the cast iron segment S2 has a substantially rectangular shape that curves along the circumferential direction of the tunnel T. In the embodiment shown in FIG. 1, the concrete segment S1 is the cast iron segment S2. Therefore, the tunnel portion constructed by the concrete segment S1 and the tunnel portion constructed by the cast iron segment S2 have the same outer diameter and different inner diameters.
The concrete segment S1 includes the butt surface 2, that is, the butt surface 2 with respect to the cast iron segment S2, and is formed with two sealing grooves 3a and 3b around the four sides. In the manufactured segment S2, two sealing grooves 5a and 5b are formed around the four sides including the abutting surface 4.

The two sealing grooves 3a, 3b, 5a, 5b in both the segments S1, S2 are all configured to have substantially the same width, but due to the difference in thickness between the concrete segment S1 and the cast iron segment S2. The four seal grooves 3a, 3b, 5a, and 5b have different radii of curvature around the tunnel axis P because the respective performance and shape are designed to be optimal. Yes.
One of the two types of segments S1, S2, for example, the concrete segment S1 is installed on one side along the direction of the tunnel axis P, and the other cast iron segment S2 is installed on the other side. Therefore, a shield tunnel adjustment segment (hereinafter referred to as an adjustment segment) S3 is required at the connection point between both segments S1 and S2 in order to adjust between the butting surfaces 2 and 4 of both segments S1 and S2. .

As shown in FIG. 2, the adjustment segment S3 is made of ductile cast iron having a substantially rectangular shape curved along the circumferential direction of the tunnel T, and the first abutting surface corresponding to the abutting surface 2 of the concrete segment S1. 6. It has the 2nd butt | matching surface 7 corresponding to the butt surface 4 of the segment S2 made from cast iron, and the right and left side surfaces 8 orthogonal to both the butt surfaces 6 and 7.
The first abutting surface 6 has a thickness substantially equal to the thickness of the abutting surface 2 of the concrete segment S1, and the second abutting surface 7 has a thickness of the abutting surface 4 of the cast iron segment S2. Therefore, on the first abutting surface 6 side, a smooth tapered surface 9 is formed on the inner side.
That is, the thickness of the adjustment segment S3 is configured to substantially match the thickness of the cast iron segment S2 having a small thickness, and is directed inward toward the first abutting surface 6 to the thick concrete segment S1. A tapered surface 9 is formed, and the thickness thereof is configured to substantially match the thickness of the concrete segment S1.

The first abutting surface 6 of the adjustment segment S3 is substantially the same as the sealing groove portions 3a and 3b so as to correspond to the two sealing groove portions 3a and 3b formed on the abutting surface 2 of the concrete segment S1. Two first seal grooves 10a and 10b having substantially the same radius of curvature as the width of the first seal groove are formed. Similarly, the second abutting surface 7 has two formed on the abutting surface 4 of the cast iron segment S2. Two second sealing groove portions 11a and 11b having substantially the same width and the same radius of curvature as the sealing groove portions 5a and 5b are formed so as to correspond to the sealing groove portions 5a and 5b. .
In order to continuously connect the two first seal groove portions 10a and 10b and the second seal groove portions 11a and 11b to the both side surfaces 8 of the adjustment segment S3, the respective groove portions 10a, 10b, 11a, and 11b are connected. The two adjustment groove portions 12a and 12b having substantially the same width as the first and second seal groove portions 10a and 10b and the second seal groove portions 11a and 11b are formed by two adjustments. It is comprised so that it may mutually continue around adjustment segment S3 via groove part 12a, 12b.

As described above, the adjustment segment S3 for the shield tunnel has the first sealing groove portions 10a and 10b corresponding to the sealing groove portions 3a and 3b formed on the abutting surface 2 of the concrete segment S1 to the concrete segment S1. Second sealing groove portions 11a and 11b corresponding to the sealing groove portions 5a and 5b formed on the butting surface 4 of the cast iron segment S2 are provided on the second butting surface 7 to the cast iron segment S2. Therefore, the sealing groove portions 3a and 3b of the concrete segment S1, the sealing groove portions 5a and 5b of the cast iron segment S2, and the first sealing groove portions 10a and 10b and the second sealing groove portion 11a of the adjustment segment S3 are provided. , 11b, etc., and the first and second segments S1, S2 are inserted through the adjustment segment S3. By forming the fixed, it is possible to ensure the waterproofing performance as desired in between the respective segments S1, S2, S3.
The first seal groove portions 10a and 10b and the second seal groove portions 11a and 11b are configured to be continuous with each other around the adjustment segment S3 via the adjustment groove portions 12a and 12b. The desired water stop performance can be ensured between the adjacent adjustment segments S3 in the circumferential direction of the tunnel T by the insertion.

[Another embodiment]
Next, although another embodiment will be described, the configuration described in the previous embodiment and the configuration having the same action are denoted by the same reference numerals, detailed description thereof is omitted, and mainly the configuration different from the previous embodiment. explain.

(1) Although the example which provided the adjustment groove parts 12a and 12b which inclined in the both-sides 8 of adjustment segment S3 was shown in previous embodiment, for example, as shown in FIG. 3, two adjustment groove parts 12a and 12b are shown. Of these, at least one of the groove portions 12b can be configured as a groove portion bent in a crank shape, and although not shown, both the groove portions 12a and 12b can be configured as groove portions bent in a crank shape. .

(2) In the previous embodiment, the first segment S1 is a concrete segment, the second segment S2 is a ductile iron segment, and the tunnel adjustment segment S3 is a ductile iron segment. Various changes can be made to the materials constituting these segments S1, S2, S3.
For example, the first and second segments S1 and S2 are concrete segments. In the sealing grooves 3a and 3b of the first segment S1 and the sealing grooves 5a and 5b of the second segment S2, the radius of curvature of each groove and / or Alternatively, when the widths are different, a concrete segment can be used as the tunnel adjustment segment S3.
Moreover, although the example which made the outer periphery diameter of 1st and 2nd segment S1, S2 substantially the same was shown, conversely, it may carry out by making the inner periphery diameter of 1st and 2nd segment S1, S2 substantially the same. it can. In that case, contrary to the previous embodiment, a taper surface facing outward is formed on the first abutting surface 6 side to the first segment S1, and the thickness thereof is substantially equal to the thickness of the first segment S1. It will be configured to match.

(3) In the previous embodiment, the sealing groove portions 3a and 3b of the first segment S1, the sealing groove portions 5a and 5b of the second segment S2, and the first sealing groove portions 10a and 10b of the adjustment segment S3, the second The example of having two seal grooves 11a and 11b and two adjustment grooves 12a and 12b has been shown, but the present invention can be applied to one having only one groove or three or more.

Longitudinal side view of adjusting segment for shield tunnel Perspective view of adjusting segment for shield tunnel Longitudinal side view of an adjustment segment for a shield tunnel according to another embodiment Vertical side view of adjustment segment for shield tunnel showing comparative example

Explanation of symbols

2 Butting surface of the first segment 3a, 3b Sealing groove of the first segment 4 Butting surface of the second segment 5a, 5b Sealing groove of the second segment 6,7 Butting surface of the adjusting segment for the shield tunnel 10a, 10b First 1 seal groove portion 11a, 11b second seal groove portion 12a, 12b adjustment groove portion P tunnel axis S1 first segment S2 second segment S3 adjustment segment T for shield tunnel T shield tunnel

Claims (2)

The first segment installed on one side along the tunnel axial direction and the second segment installed on the other side have seal grooves with different curvature radii or widths, and the first segment An adjustment segment for a shield tunnel that is installed between the second segments and is used for adjustment between the butting surfaces of the first segment and the second segment,
The adjustment segment has a first sealing groove corresponding to the sealing groove formed on the abutting surface of the first segment on the abutting surface of the first segment, and is used for the sealing formed on the abutting surface of the second segment. A second sealing groove corresponding to the groove is provided on the abutting surface of the second segment, and the first sealing groove and the second sealing groove are connected to each other around the adjustment segment via the adjustment groove. Adjustment segment for shield tunnels that are configured to. In the adjustment segment, the outer peripheral diameter is configured to substantially coincide with the outer peripheral diameters of the first and second segments having the same outer peripheral diameter, and the thickness thereof is substantially the same as the thickness of the thin second segment. An inwardly tapered surface is formed on the abutting surface side of the thick first segment, and the thickness of the first segment is substantially the same as the thickness of the first segment. The adjustment segment for a shield tunnel according to claim 1, wherein the adjustment segment is configured.

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