JPH02213597A - Tunnel structure - Google Patents

Abstract

PURPOSE:To arrange the pillars and walls at optional positions by connecting lining bodies with an operlap portion and arranging beams extended along the longitudinal direction of a tunnel on the inside of the lining bodies located above and below the connection section. CONSTITUTION:The natural ground is drilled by a shield machine, and the drilled wall face is lined with segments 5 including segments 5a and 5b with expanded sections 7a and 7b and a segment 5c with a shape covering an operlap section 3 to form a main tunnel 2. H-type steels 9 are arranged along the longitudinal direction of the tunnel 2 on the horizontal faces 8a and 8b of the segments 5a and 5b, and pillar materials 10 are arranged at the preset interval between the H-type steels 9. The segment 5c at the overlap section is removed, the other natural ground is drilled, and the drilled wall face is lined with a segment 6 to form an expanded section tunnel 4.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a tunnel structure having a cross-sectional shape in which a plurality of excavated cross-sections are joined at overlapping portions, that is, a multi-cross-section.

``Prior art'' When forming underground tunnels, for example at station areas in railway tunnels or at junction areas in automobile tunnels,
It may be necessary to form a cross section that is partially widened compared to a normal excavation cross section.

For this reason, a tunnel formed with a normal excavation cross section is used as a base, and a widened section is formed from this tunnel using a rolled machine or an excavator.

In this way, in widening sections with multiple excavation cross sections, reinforcing columns and walls are placed at predetermined intervals because stress is concentrated at the overlapping parts (junctions) of these excavation cross sections. . For example, when a tunnel is formed by the shield method, the spacing between the pillars and walls is the spacing between each segment ring.

``Problems to be Solved by the Invention'' However, in the conventional tunnel having the widening section, columns and walls must be densely arranged at relatively narrow intervals in the overlapped section of the excavation cross section, and columns and walls cannot be placed at arbitrary positions. Since it is not possible to deploy the system, there are restrictions on its purpose of use, making it difficult to apply it widely.

This invention has been made in view of the above circumstances, and aims to provide a tunnel structure in which pillars and walls can be placed at arbitrary positions in the overlapping section of excavation cross sections.

``Means for Solving the Problems'' Therefore, the present invention provides a tunnel structure in which a plurality of excavation cross sections are joined with overlapping portions, and a lining is disposed along the inner wall surface of the tunnel structure. The above-mentioned problem is solved by arranging beams extending along the longitudinal direction of the tunnel on the inner surface of the lining body located above and below the joint.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are diagrams showing an embodiment in which the tunnel structure of the present invention is applied to a tunnel in the shield construction method.

In the figure, reference numeral l denotes a tunnel having a widening section, and this tunnel 1 is divided into a main tunnel 2 having a circular excavation cross section,
The main tunnel 2 is joined to one side by an overlapping part 3, and is comprised of a widened tunnel 4 having a circular excavation cross section with a slightly smaller diameter than the main tunnel 2. The inner wall surfaces of these tunnels 2.4 are lined with segments 5.6, .

Among the segments 5, .
, 5b are formed with bulges 7a and 7b that bulge inward of the tunnel 2 at opposing parts, respectively.
Opposing horizontal surfaces 8a and 8b are formed in parts of a and 7b. H-shaped steels (beams) 9.9 extending in the longitudinal direction of the tunnel 2 are arranged on the horizontal surfaces 8a and 8b, and a predetermined interval is provided between the H-shaped steels 9.9. Pillar members 10, 10, . . . are disposed.

The tunnel 1 having such a configuration first includes segments 5a and 5b having bulging portions 7a and 7b and a segment 5C shaped to cover the overlapping portion 3 while excavating the ground with a shield machine having a circular cross section. The main tunnel 2 is formed by lining the excavated wall surface with segments 5, . . . Next, Segmen! -5a.

H-shapes 11i19.9 are arranged on the horizontal surface 8a18b of the tunnel 2 along the longitudinal direction of the tunnel 2, and pillars 10.10,...
Place. Furthermore, while removing the segment 5C of the overlapping part 3, the ground on the side of the main tunnel 2 is excavated using a shield machine or an excavator, and the excavated wall surface is lined with segments 6,... A tunnel 4 is formed.

Therefore, since the tunnel 1 of this embodiment is provided with an H-beam 9.9 extending along the longitudinal direction of the tunnel 1 in its overlapping portion 3, this overlapping portion 3 is structurally reinforced. By doing so, the pillar 10. It becomes possible to arrange... This eliminates the need to provide pillars for each segment ring as in the prior art, and it is possible to realize a tunnel in which the overlapping portion 3 is wide open.

Note that the details of the tunnel structure of the present invention are not limited to the above embodiments, and various modifications are possible. - As an example, the beam material is not limited to H-beam steel as in the above embodiments, but well-known and commonly used beam materials can be suitably used. Further, in the above embodiment, a tunnel having a double cross section was formed by joining two tunnels, but the tunnel structure of the present invention can also be suitably applied when three or more tunnels are joined. can do. Furthermore, the method of constructing the tunnel of the present invention is not limited to the method of the above-mentioned embodiments, and it is of course possible to form the tunnel by, for example, excavating with a shield machine that can excavate multiple sections at once. be.

"Effects of the Invention" As explained in detail above, according to the present invention, a plurality of excavation sections have a cross-sectional shape joined with overlapping parts, and a lining body is arranged along the inner wall surface. In the tunnel structure, beams extending along the longitudinal direction of the tunnel are provided on the inner surface of the lining located above and below the joint, so that this overlapping part is structurally strengthened, making it possible to It becomes possible to place pillars and walls at the positions of This eliminates the need for densely arranging pillars and walls at relatively narrow intervals as in the past, and it is possible to realize a tunnel with wide open overlapping parts.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a tunnel structure that is an embodiment of the present invention, in which FIG. 1 is a cross-sectional view, and FIG. 2 is a view taken along the line nn' in FIG. 1. FIG. ■...Tunnel, 2...Main tunnel,
3... Overlapping section, 4... Widening section tunnel, 5.6... Segment (lining), 9...
...H-shaped w4 (beam material), 10... Column material.

Claims (1)

[Claims] A tunnel structure having a cross-sectional shape in which a plurality of excavation cross sections are joined with overlapping parts, and a lining is arranged along the inner wall surface, and the inner surface of the lining is located above and below the joint. is a tunnel structure characterized by having beams extending along the longitudinal direction of the tunnel.