JPH079153B2 - Multiple tunnels and shield segments for multiple tunnels - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shield segment for multiple tunnels having a plurality of tunnel spaces, and more specifically, to a tunnel-shaped shield segment having a plurality of tunnel spaces secured from a vertically long to horizontally long tunnel segment. The present invention relates to a multiple tunnel and a shield segment for a multiple tunnel capable of imparting a twist for transitioning to a hemisphere or vice versa.

<Prior art> As a shield technology that reduces unnecessary cross-sections and effectively uses underground space, a shield machine equipped with multiple sets of excavation heads has a cross-sectional shape (overlapping circles) in which part of multiple circles are overlapped.
A shield construction method is known in which the segments are assembled after being excavated.

In general, this type of multiple tunnel is roughly classified into a vertical type and a horizontal type according to the arrangement of the tunnel space inside.

The choice of vertical or horizontal type multiple tunnels is made in consideration of the construction depth and the use of the tunnels, etc. Therefore, it is desired to propose a technology capable of shifting from a horizontal type to a vertical type (or a vertical type to a horizontal type).

<Problems to be Solved by the Present Invention> A method of shifting the joint position of a horizontal type (or vertical type) segment is conceivable as a means for gradually giving a twist to a multiple-type tunnel. There is such an inconvenience.

<A> As a method of shifting the joint position, a method of shifting the mounting position of the bolt box provided in the segment can be considered.

However, in the case of this method, a step is formed at the joint of the segment and a smooth shape cannot be obtained.

<B> As another method of shifting the joint position, a method of shifting the bolt holes by using a larger bolt box is conceivable. However, when the bolt box becomes large, the flexure of the joint surface becomes large and it is easily damaged.

<C> When the application of the above two methods to concrete (RC) segments is considered, the reinforcement cannot be performed properly, and the reliability of the strength of the segment becomes low.

<Purpose of the present invention> The present invention has been made in view of the above points, and an object of the present invention is to obtain a smooth shape without forming a step at a seam and to cope with bending of a joint surface. it can,
An object is to provide a multiple tunnel and a shield segment for the multiple tunnel.

<Structure of the Present Invention> An embodiment of the present invention will be described below with reference to FIGS.

In the present embodiment, a double-type shield segment having two tunnel spaces will be described.

<A> Tunnel configuration segment Fig. 1 shows an example of a double shield tunnel.

This tunnel is constructed by arranging an arc segment 1 occupying most of the outer shell of the tunnel, a branch segment 2 constituting the outer shell of the overlapping portion of two cylinders, and branch segments 2 and 2 facing each other, to form two tunnel spaces. It consists of three types of panel segments, which define the AB.

Each of the segments 1 to 3 according to the present invention is formed so that a twist is given to the whole and a pair of joint surfaces formed on the peripheral surfaces of the segments 1 to 3 are twisted.

Each segment will be described below.

<B> Arc segment The arc segment 1 is a segment formed by bending a rectangular plate body in an arc shape. Particularly, a twist is added to the whole to form two circles formed in the circumferential direction of the tunnel. The circumferential joint surfaces 1a, 1a and the two shaft joint surfaces 1b, 1b formed in the axial direction of the tunnel are formed in a twisted relationship.

Bolt box 11 for joints on the periphery of arc segment 1
The bolt boxes 11 are provided at positions equidistant from the circumferential joint surface 1a as in the conventional case.

The twist given to the arc segment 1 can be easily obtained from the requirements such as the curvature of the tunnel and the width of the arc segment 1 in the tunnel direction.

<C> Bifurcation segment The bifurcation segment 2 is composed of bifurcations 21, 22, 23 extending in three directions, and the bifurcations 21, 22 form an inwardly curved outer peripheral surface. A branch portion 23 is formed to join the panel segment 3 to the.

The branch segment 2 has a twist to the whole, and the branch part 2
Circumferential joint surfaces 2a, 2a and shaft joint surface 2 formed at the ends of 1, 22
The shapes formed by b and 2b are formed so as to have a twist relationship.

Further, a bolt box is also provided at the peripheral edge of the branch segment 2.

In the present embodiment, two types of segments in which the protrusion lengths of the branch portions 21 and 22 of each set are equal for each branch segment 2 and the protrusion lengths thereof are relatively different will be described. 22 segments with different protruding lengths may be used.

<D> Panel segment 3 The panel segment 3 is a plate body that presents a rectangular shape when unfolded. Each of them is formed in a twisted relationship.

Providing the bolt box on the peripheral portion of the panel segment 3 is similar to the segments 1 and 2 described above.

<Operation> When a vertical double tunnel is transferred to a horizontal tunnel, the above-mentioned arc segment 1 group, branch segments 2 and 2, and panel segment 3 are provided at the final portion of the double-lined lining using known segments. Assemble one by one to extend the tunnel spaces A and B.

At this time, the facing positions of the branch segments 2 and 2 are alternately used for each span to avoid the joint positions from matching.

Since the facing joint surfaces of the segments 1 and 2 have a twisting relationship, the assembly position of the branch segment 2 and the panel segment 3 moves clockwise or counterclockwise each time the tunnel is extended by one span. To go.

As a result, the tunnel itself is gradually twisted, and the tunnel spaces A and B, which were initially in a vertical positional relationship (vertical type), gradually change their positions and shift to a lateral positional relationship (horizontal type).

Further, the joints in the tunnel direction of the arc segments 1 and the branch segments 2 are formed smoothly without a step due to the twist of the segments 1 and 2.

<Other Example 1> Although the shield segment described above has been described as being twisted, the segment has a parallelogram shape,
By giving a certain inclination to the axis of the tunnel,
The tunnel can be twisted by shifting the position of the joint bolt.

In the description of this embodiment, a double-type shield segment will be described as in the case of the above embodiment.

Each segment will be described below.

<A> Arc segment (Figs. 3 and 4) The arc segment 10 is an arc plate having a parallelogram when expanded.

That is, the arc segment 10 has two circumferential joint surfaces 10a, 10a formed in the circumferential direction of the tunnel and two axial joint surfaces 10 formed in the axial direction of the tunnel.
b and 10b are formed parallel to each other and have the same length,
Inner angles α and β with the shaft joint surfaces 10b and 10b at both ends of the circumferential joint surface 10a are different from each other.

Bolts 11 for joints on the periphery of the arc segment 10
Although 0 is provided, these bolt boxes 11 are provided at positions equidistant from the circumferential joint surface 10a as in the conventional case.

<B> Branching Segment (FIGS. 5 and 6) The branching segment 20 has branching portions 210, 220, 230 extending in three directions as in the above-described embodiment.

It is the same as the arc segment 10 that the branch segment 2 has a parallelogram as a whole when it is expanded and that the interior angles α and β of the parallelogram are different from each other.

Therefore, the branch segment 20 can also be provided with a constant inclination α with respect to the axis of the tunnel, like the arc segment 10.

Further, a bolt box is provided on the peripheral portion of the branch segment 20.

<C> Panel segment The panel segment 3 has a rectangular shape when unfolded, and is provided with a twist in the opposite direction so that the center line parallel to the tunnel axis is symmetric as in the above embodiment.

<Other Embodiment 2> Although the above-described embodiment describes the shield segment for two-way type, it is needless to say that it can be applied to a multiple-type tunnel having three or more tunnel spaces.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<B> The lining can be performed in a smooth shape without forming a step at the joint portion of the segment.

<B> Compared with the method of shifting the positions of the bolt holes, the bolt box can be made smaller, which is economical, and since the bar arrangement can be properly assembled, the strength is also highly reliable.

<C> It can be applied to multiple shield tunnels and has wide versatility.

[Brief description of drawings]

 Fig. 1: Assembly view of shield segment according to the present invention Fig. 2: Perspective view of arc segment Fig. 3: Perspective view of other arc segment Fig. 4: Front view thereof Fig. 5: Perspective view of other branch segment Fig. 6: Front view

Front Page Continuation (72) Inventor Miya Kiyo 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Hiromi Hagimoto 1-24-4 Shinkawa, Chuo-ku, Tokyo Otoyo Construction Co., Ltd. (56) Reference JP-A-50-118540 (JP, A) JP-A-62-59799 (JP, A)

Claims (3)

[Claims] 1. A multiple tunnel having a plurality of tunnel spaces, wherein an arc segment occupies most of the outer shell of each tunnel, a branch segment forming an outer shell of the overlapping portion of each tunnel, and a branch facing each other. It is composed of panel segments that are installed between the segments to define the space of each tunnel, and the three types of segments are two circumferential joint surfaces formed in the circumferential direction of the tunnel and the axial direction of the tunnel. A multi-type tunnel characterized in that the two shaft coupling surfaces formed toward each other are formed in a twisted relationship, and that the entire tunnel has a twist. 2. A segment for a multiple tunnel, which has a plurality of tunnel spaces and is provided with a twist to the entire tunnel, comprising two circumferential joint surfaces formed in the circumferential direction of the tunnel. A shield segment for multiple tunnels, characterized in that the two shaft joint surfaces formed in the axial direction of the tunnel are formed so as to have a twist relationship. 3. A multi-unit tunnel having a plurality of tunnel spaces, wherein arc segments occupy most of the outer shell of each tunnel, branch segments constituting the outer shell of the overlapping portion of each tunnel, and opposing branches. It is composed of panel segments that are installed between the segments to define the space of each tunnel, and the arc segment and the branch segment are formed so that the developed shape is a parallelogram, and the panel segment is the circumferential direction of the tunnel. The two circumferential joint surfaces formed in the direction of the tunnel and the two axial joint surfaces formed in the axial direction of the tunnel are formed so as to have a twisting relationship with each other. Multiple tunnels, characterized by being constructed and constructed.