JPH084491A - Segment having gull part projection in multi-circular shield construction and installation thereof - Google Patents

Abstract

PURPOSE:To improve the insertion performance of the structure pillar of a sea gull part segment and the demounting workability and obtain the structure for allowing a longitudinal girder after demounting a structure pillar to be easily provided with the integral performance. CONSTITUTION:A sea gull part segment 3 in the polygonal circular shield construction in which a polygonal circular tunnel having the shape in the combination of a plurality of circular shapes is constructed by combining a plurality of segments, a flat part 7 is formed on the side where the sea gull part segment 3 is supported by structure pillars. On the flat part 7, a projection part 13 connected with the structure pillar is formed, and as for the projection part 13, the dimension in the axial direction of the tunnel is smaller than the width of the segment, and each girder installation part 12 for installing a longitudinal girder on the flat part 7 is formed on both the sides in the direction perpendicular to the tunnel axis direction of the projection part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seagull segment in a multi-circle shield construction for constructing a multi-circle tunnel having a shape obtained by combining a plurality of circles by combining a plurality of segments, and a method of assembling the segment.

[0002]

2. Description of the Related Art In recent years, a multi-circular shield construction method that can form a tunnel with a cross-sectional shape that combines multiple circles has been constructed for the first time as a shield tunnel construction method that enables advanced use of underground space. By the way
Although the open-cut construction method is used in the station section and the shield construction method is used between the stations, the shield construction method is beginning to be adopted also in the station section from the viewpoint of overcrowding of the city and effective use of underground space.

[0003] Conventionally, after the shield tunnel has been constructed, the ground has been improved, then vertical sewing bolts have been constructed, the segment is removed and the mountain is excavated in a mountain system. There is known a technique for constructing a station part by using a front-end construction method such as a pipe roof for precipitating the ground with a pipe roof, and a method of expanding a tunnel between tunnels by a girder girder and a roof shield construction method.

Further, due to the recent progress of the multi-circle shield technology, a plurality of shield tunnel tunnels are known by the multi-face shield method and the DOT method.

[0005]

However, the construction of the station section by the shield construction method has three circular shield tunnels regardless of whether it is the central platform type or the side platform type. Structural columns are required for each connecting portion, and the insertability of the structural columns during segment assembly becomes a problem.

That is, as shown in FIG. 8, a seagull portion segment 33 used for a circular connecting portion is a vertical girder h1 attached between a portion 43 to which a structural column (temporary column shown in FIG. 9) h is attached and an adjacent segment. It has a flat part 37 having a girder mounting part 42 for mounting. Further, as shown in FIG. 9, when the segment piece S (hereinafter referred to as the segment S) and the seagull portion segment 33 are assembled and the structural pillar h is mounted between the upper and lower seagull portion segments 33, for example, the upper side is a predetermined portion. Positioned at 43, the lower part of the column is slid from the end of the flat part 37 and inserted.

In this case, the sliding distance is large, and more specifically, the flat portion may be slightly inclined due to an error in segment assembly or the like, so that friction is large and it is difficult to insert the structural column h. Easy to do.

The reference character P indicates a completed platform.

Further, at the time of completion, for example, in the case of a station section, due to the convenience of the station or the like, the structure is such that the load is applied to the main columns 15 provided every several rings through the longitudinal beams h1.
Removability of structural columns is also a problem, but this can be solved at the same time as insertability.

Therefore, according to the present invention, the seam gull portion projection segment in a multi-circular shield construction having a good insertion property of the structural pillar of the seagull portion segment and having a structure in which the pair of longitudinal girders can be easily integrated after the structural pillar is removed. And its assembling method.

[0011]

According to the present invention, a seagull part segment in a multi-circular shield construction for constructing a multi-circular tunnel having a shape obtained by combining a plurality of circles by combining a plurality of segments Is provided with a flat portion on the side supported by the structural pillar, and the flat portion is provided with a protrusion that is connected to the structural pillar, and the protrusion has a dimension in the tunnel axis direction smaller than the width of the segment. The girder mounting parts for mounting the longitudinal girders are provided on the flat part on both sides in the direction perpendicular to the tunnel axis direction.

Further, according to the present invention, each segment is assembled, a structural column is installed between the projections provided on the upper and lower seagull projection segments, and the projections of the adjacent seagull projection segments are installed. A pair of vertical girders are installed across the girder mounting parts provided on both sides, and the pair of vertical girders are fixed and integrated by a fixing means in a space in the axial direction of the vertical girder formed between the protrusions of adjacent segments. The present invention provides a method for assembling a segment with a seagull protrusion in a multi-circle shield construction, characterized by:

The stringer fixing means provides an assembling method in which the stringer bars are arranged between a pair of stringers and fixed and integrated by concrete placing.

Further, the stringer fixing means provides an assembling method in which a stringer connecting member is installed between a pair of stringers to fix and integrate them.

[0015]

The present invention is configured as described above, and the flat portion is provided inside the tunnel in which the seagull segment is supported by the structural pillar, and the flat portion is provided with the projection portion that is connected to the structural pillar. , The dimension of the protrusion in the tunnel axis direction is smaller than the width of the segment, and the girder mounting portions for mounting the longitudinal girders are provided on both sides of the protrusion in the direction perpendicular to the tunnel axis direction. Therefore, the vertical girder mounting portion and the protruding portion are not on the same plane. Therefore, the position of the stringer can be moved to the inside of the tunnel to shorten the structural pillar without narrowing the tunnel space, and the dimension of the protrusion in the tunnel axis direction is smaller than the width of the segment. A pair of vertical girders provided on both sides of the projecting portion by using a space in the vertical girder direction formed between the projecting portions of the segments adjacent to each other are fixedly integrated by a fixing means.

Therefore, it is possible to secure a wide tunnel space, improve the insertability of the structural columns and main columns in the tunnel space, and perform efficient segment installation work.

Further, according to the method for assembling the segment with seagull projections of the present invention, the structural pillars are assembled to the projections in a state where each segment is assembled at a predetermined position, and then the segments are adjacent to each other in the tunnel axial direction. A pair of vertical girders are attached across the girder mounting portions of both seagull portion segments, and the vertical girders are fixed by fixing means in the space between the protrusions of the seagull portion segments that are adjacent in the tunnel axis direction.

Since the structural column is assembled between the projecting portions provided on the flat portions of the upper and lower seagull segment, the column is shorter than when there is no projecting portion, and the projecting portion is provided to measure its size. Is smaller than the width of the segment in the axial direction of the tunnel, so the distance that the column slides is short. Specifically, if the segment is tilted due to construction errors, the friction distance with the column base plate is small and the assembly work Will be easier.

In the fixing means, the pair of vertical girders are fixed by placing concrete by placing a width stop bar on the pair of vertical girders installed in the girder mounting portion to prevent the vertical girders from moving in the width direction. Either integration or use of a connecting member for connecting a pair of stringers may be selected.

[0020]

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

FIG. 6 is a completed drawing of a triple shield tunnel showing an axial cross section of a tunnel using a segment according to the present invention. In the figure, the shield tunnel T formed by the triple multi-circle shield construction method is An example configured as a railway tunnel is shown, in which a plurality of segment pieces S are assembled along the circumferential direction of the tunnel T, and the ring-shaped segments formed thereby are connected in the tunnel axial direction to form the tunnel space V. ing. The example of the figure shows a station part, and the central part of the three stations is a platform 1 and both sides thereof are track parts 2.

Further, the segment S includes an arc-shaped one and a segment formed for a connecting portion of the arc. The segments S and 5 and the circumference and the circumference are formed in the arc shape. It is composed of a K-shaped segment 3 that constitutes a seagull portion that forms a connection portion.

The seagull portion of the K-shaped segment 3 is reinforced by the main pillar 15, the protrusion 13 engages with the end portion h2 of the main pillar 15, and the longitudinal girders h1 are provided on both sides thereof. . Further, the structural column h shown by a chain line indicates a structural column (temporary column) which is removed after the K-shaped segment 3 is reinforced by the main column and the vertical girder as described later, and the symbol C indicates concrete.

FIG. 1 and FIG. 2 are perspective views showing an example of a segment embodying the present invention, and a K-shaped segment 3 thereof.
Is formed into three continuous arcs and is composed of a main body 6 connected to the left and right segments 4 and 5 and a flat portion 7 forming a girder mounting portion 12 for mounting a vertical girder on the tunnel side of the main body 6, A rectangular protrusion 13 is provided at the center of the flat portion 7.

A plate-shaped portion 8 for partitioning the inside and the outside of the tunnel is provided on the outer side of the main body 6, and the back surface of the plate-shaped portion 8 has ribs 8a, 8a along the longitudinal direction and a plurality of ribs 8a perpendicular to the ribs 8a. Ribs 10 are provided, and ribs 8a and 1 are provided at the outer central portion.
Concrete is filled in the concave portions formed by 0 and 0 so as to disperse the stress.

Reference numeral 11 indicates a grout hole for back-filling injection, reference numeral 11a indicates a hole which engages with a segment assembly device (not shown), and the hole 11a is constructed so that it can be used as a grout hole after mounting.

The segment assembling method will be described below with reference to FIG.
It will be described with reference to FIGS. In FIG. 3, in the state where the segments 4, 5 and 3 are assembled, a structural column h (column shown on the left side of the figure) which is a temporary column and a few segments (example shown in the figure) on the protrusion 13 of the K-shaped segment 3. Then 4 segments)
A main pillar 15 (a pillar shown on the right side of the figure) is built for each.

Next, referring to FIG. 4, a pair of vertical girders h1 are installed between the girder mounting portion 12 of the K-shaped segment and the main column support plates 15a of the plurality of main columns 15, and the upper main bar 21 and the upper width retaining bar 22 are provided. The horizontal horizontal bars 23, the stirrup 24, the lower width stop bars 25, the auxiliary bars 26, and the lower main bars 27 are arranged, respectively, and the concrete beams are fixed and integrated with the concrete. In the subsequent step, as shown in FIG. 5, if the structural pillars h (shown by chain lines) are removed, only the main pillars remain in the station part and the K-shaped segment (three segments in the illustrated example) between the main pillars is a vertical girder. The protrusion 13 is supported.

Since the area of the tip of the protrusion 13 is small, the distance for sliding the structural column or the main column is short, and the insertability is good, and it is also effective for obtaining the separation when the column is turned by the erector.

FIG. 7 shows another embodiment of the method for assembling the segment with seagull protrusions. In the above-mentioned embodiment, the fixing means for fixing and integrating the vertical girder has a concrete striking means in which a width stop bar is arranged on the vertical girder. In contrast to the method by installation, the vertical girder is fixed and integrated by mounting the girder connecting member 14 (for example, I-shaped steel) in the space between the protrusions of the K-shaped segments adjacent in the tunnel axis direction. Others are the same as those in the above-mentioned embodiment, and the operation is the same. This method is advantageous when applied to the case where concrete is not placed on the longitudinal girders.

[0031]

Since the present invention is constructed as described above, it has the following excellent effects.

(1) A multi-circular shield tunnel requiring a plurality of structural columns (temporary columns) can be efficiently constructed.

(2) By removing the structural columns, a wide space with few main columns can be constructed more easily than before.

(3) The structural column can be shortened and its insertability is improved, which can contribute to shortening the construction period.

(4) Therefore, for example, a subway station or the like can be constructed in a short time by the shield construction method.

[Brief description of drawings]

FIG. 1 is a perspective view of a K-shaped segment as seen from the tunnel side showing an embodiment of the present invention.

FIG. 2 is a perspective view of the K-shaped segment of FIG. 1 viewed from the outer peripheral side.

3 is a cross-sectional view showing an example of a triple tunnel using the K-shaped segment of FIG.

FIG. 4 is a diagram showing a BB cross section of FIG. 5;

FIG. 5 is a view showing the arrow A in FIG.

FIG. 6 is a completed cross-sectional view of the station section by the K-shaped segment of FIG.

FIG. 7 is a vertical sectional view of a tunnel showing another embodiment of the present invention.

FIG. 8 is a perspective view of a seagull portion segment showing an example of a conventional technique.

9 is a cross-sectional view showing an example of a tunnel using the segment of FIG.

[Explanation of symbols]

 3, 33 ... K-shaped segment 6 ... Main body 7, 37 ... Flat part 8a, 10 ... Rib 12, 42 ... Girder mounting part 13 ... Projection part 14 ... Girder connection member 15 ... Main column h ... Structural column h1 ... Vertical girder h2 … End of main pillar S… Segment

Front page continuation (72) Inventor Katsuji Wada 7-22, Minamienkajima, Taisho-ku, Osaka City, Osaka Prefecture Kubota Onkajima Plant (72) Inventor Tsutomu Konno Minamienkajima, Taisho-ku, Osaka City, Osaka Prefecture No. 1-22 Kubota Co., Ltd. Onkajima factory

Claims (4)

[Claims] 1. A seagull part segment in a multi-circular shield construction for constructing a multi-circular tunnel having a shape combining a plurality of circles by combining a plurality of segments, wherein the seagull part segment is flat on the side supported by a structural column. A protrusion is provided on the flat portion, which is connected to the structural pillar, and the protrusion has a dimension in the tunnel axis direction smaller than the width of the segment, and the protrusion has both sides in a direction perpendicular to the tunnel axis direction. A segment with a seagull protrusion in multi-circle shield construction, which is equipped with a girder mounting part for attaching a vertical girder to the flat part. 2. A girder provided on both sides of a protrusion of an adjacent segment with a seagull protrusion by assembling each segment, installing structural columns between the protrusions provided on the upper and lower segments with a seagull protrusion A pair of vertical girders are installed across the mounting portion, and the pair of vertical girders are fixed and integrated by a fixing means in a space in the axial direction of the vertical girder formed between the protrusions of adjacent segments. Assembling method of segment with seagull protrusion in multi-circle shield construction. 3. A set of segments with seagull protrusions in the multi-circular shield construction according to claim 2, wherein the fixing means for the vertical girders is fixed and integrated by concrete placing in which a width stop bar is arranged between a pair of vertical girders. Attaching method. 4. The method for assembling a segment with a seagull projection in a multi-circular shield construction according to claim 2, wherein the stringer fixing means is provided by installing a stringer connecting member between a pair of stringers to fix and integrate the stringer. .