JPH0634476Y2 - Double shield tunnel segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to the structure of a segment used in a double shield tunnel, and more particularly to improvement of the shape of segment parts provided above and below the center of a spectacle shape.

《Prior art》 When constructing a subway, etc. by the shield construction method, if a double-track section or an underground station part is used as one tunnel, it will become a large section and wasteful space will increase, so between two parallel shield tunnels. A spectacle-shaped cross-sectional structure that is cut and connected is adopted.

By the way, it is difficult to design the segments when the shield tunnels are overlapped for construction, and the construction becomes complicated when many kinds of segments are used.

As a solution to the drawbacks of the segment design for a double shield tunnel of this type, for example, a segment having the structure shown in FIG. 2 has been developed.

As shown in detail in FIG. 2, the segment of this structure is located above and below the central partition wall 1 in the double shield tunnel, and a pair of large and small Y-shaped joining pieces 2 and 2 are provided in the eyeglass-shaped overlapping portion. It is a thing.

The joining piece 2 is formed by integrally providing a vertical piece 3 and a pair of circumferential pieces 4 and 5 formed in an arc shape on the left and right of the upper end (or the lower end) of the vertical piece 3. By disposing 4,5 upside down and alternately so as to be positioned in the tunnel axis direction, and joining them to other arc-shaped segments 6 respectively, the stress applied to the partition wall 1 is dispersed, Also,
It is possible to provide a unitary shape of a single shape.

<< Problems to be Solved by the Invention >> However, the shape of the joining piece 2 of this structure is considerably larger than that of the other segments 6, and the joining piece 2 cannot be placed inside the tunnel.
As shown in the figure, when it is carried in, it occupies a considerable space for assembling, which causes the working space to be greatly narrowed and requires a large lifting device when assembling it on the ceiling surface. There was a drawback to

This invention solves the above-mentioned drawbacks and simplifies the transportation work by dividing the joining piece into two parts,
It is another object of the present invention to provide a double shield tunnel segment which has a wide working space and can be easily assembled, and which has a robust structure when assembled.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has Y-shaped overlapping portions on both sides of a central partition in a double shield tunnel that is parallel to each other so as to overlap each other. In a double shield tunnel segment provided with a letter-shaped joining piece, the Y-shaped joining piece is provided on a vertical piece and on one end of the vertical piece in an arc shape to form a part of each tunnel segment. The first and second circumferential pieces, and one of the circumferential pieces is a vertical cut surface located between the center line of the thickness of the vertical piece and the side surface, and the tunnel center at the base of the vertical cut surface. It is characterized in that it is divided by an inclined cut surface formed obliquely toward.

<Operation> According to the above configuration, the parts are made smaller by dividing the joining piece, the transportation and the assembling are easy, the other working space can be widened, and the assembling device need not be changed. become.

When the joining piece is assembled into a Y shape, the cut surface is perpendicular to the central axis of the tunnel when the circumferential piece and the vertical piece are joined, so the butt surface does not slide and the axial force applied to the segment. And the transmission of shearing force is secured and sufficient proof stress can be given.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an assembled state of a double shield tunnel segment according to the present invention.

The segment in the drawing is located above and below the central partition wall 10 in the double shield tunnels A and B, and is provided with a pair of large and small Y-shaped joining pieces 12 and 12 in the eyeglass-shaped overlapping portion.

The Y-shaped joining piece 12 includes a vertical piece 14 that is coaxially joined to the upper and lower sides of the partition wall 10 and an arc-shaped first circumferential piece that is integrally provided on one of the upper end (or the lower end) of the vertical piece 14. 16 and a second circumferential piece 18.

The other end side joints of the respective circumferential pieces 16, 18 are respectively joined to the arcuate main body segment 20, and the assembled segment has a spectacle shape as a whole.

The joint surface between each of the circumferential pieces 16 and 18 and the segment 20 and the joint surface between the segments 20 face the center of each of the tunnels A and B, so that sufficient resistance to earth pressure can be maintained.

Further, in this embodiment, the upper Y-shaped joining piece 12 having a large overall length is divided as follows.

That is, the first circumferential piece 16 is the partition 10 or the vertical piece 14
Is divided by a vertical cut surface 22 located on the center line 1 of the thickness and an inclined cut surface 24 which is continuously formed at the base of the vertical cut surface 22 and extends obliquely toward the center of the tunnel A. There is.

The circumferential piece 16 and the vertical piece 14 thus divided have a shape that fits in an uneven shape corresponding to the V-shapes of the cut surfaces 22 and 24, and the circumferential piece 18 is a vertical piece. It is divided into two together with 14.

Therefore, when the joining piece 12 is assembled in the Y shape, the vertical cutting surface 22 and the inclined cutting surface 24 are perpendicular to the central axis of the tunnel when the first circumferential piece 16 and the vertical piece 14 are joined. As a result, sufficient yield strength is imparted to the direction in which earth pressure is applied, and the joint portion, which is the weakest portion, can be assembled in a robust state.

If the first and second circumferential pieces 16 and 18 are arranged so as to be upside down and alternately located in the tunnel direction, the position where they are joined to each segment 20 is the axial direction of the tunnel. By deviating by, the stress can be dispersed, and the robustness of this portion can be increased.

In addition, FIG. 1 shows a vertical piece 14 and a second circumferential piece 18 that constitute the Y-shaped joint piece 12 inside the partition A, the Y-shaped joint piece 12 and the tunnels A and B constructed by the segments. The state where the one-piece and the first circumferential piece 16 are brought in is shown.

As is clear from this figure, the working spaces A1 and B1 that are reduced by bringing them in can be made much wider than the working space A2 when bringing in the conventional integrated joint piece, and the work efficiency is large. The width can be improved, and since it is divided, assembly work is also easy.

In the above embodiment, the Y-shaped joining pieces 12 having different lengths from each other are used. Especially, since the lower joining piece 12 has a short total length, the circumferential piece 16 is not divided, but this is the work space. The circumferential pieces 16 or 18 may be divided in the same manner as the upper side as long as it has a length that interferes with the above.

Further, in the above embodiment, the tunnels A and B are positioned horizontally, but the present invention can be applied even when the tunnels A and B are positioned vertically.

Further, the vertical cut surface 22 has a center line 1 of the thickness of the vertical piece 14.
It is not always necessary to position it on the upper side, and the same effect as that of the above-described embodiment can be obtained as long as it is between the side surfaces on the side of the circumferential pieces 16, 18 divided from the center line 1.

<Effects of the Invention> As described in detail with reference to the embodiments above, in the double shield tunnel segment according to the present invention, the parts are made smaller by the divided construction of the joining piece, and the transportation and assembly are simplified. , Other working space can be taken large. Then, in the state where the joining piece is assembled in the Y shape, the joining state of the circumferential piece and the vertical piece can give sufficient proof strength in the direction in which the earth pressure is applied depending on the shape of the cut surface. A robust structure can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing an assembled state of a double shield tunnel segment according to the present invention, and FIG. 2 shows an assembled state of a conventional double shield tunnel segment and a state in which a joint piece is brought into the shield tunnel. It is a front view shown. A, B …… Shield tunnel 10 …… Partition wall, 12 …… Y-shaped joint piece 14 …… Vertical piece, 16 …… First circumferential piece 18 …… Second circumferential piece, 20 …… Segment 22… … Vertical cut surface, 24… Inclined cut surface

Claims (1)

[Scope of utility model registration request] 1. A segment for double shield tunnels, wherein Y-shaped joining pieces are provided in the eyeglass-shaped overlapping portions on both sides of a central partition wall in the double shield tunnels arranged side by side in an eyeglass shape so as to overlap each other. The Y-shaped joining piece is composed of a vertical piece and first and second circumferential pieces that are provided in an arc shape at one end of the vertical piece and form a part of each tunnel segment. The circumferential piece is divided by a vertical cut surface located between the center line of the thickness of the vertical piece and the side surface, and an inclined cut surface formed obliquely toward the tunnel center at the base of the vertical cut surface. This is a segment for double shield tunnels.