JPH025236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a structure in which a horizontal hole is formed in a notch in a tunnel wall formed by arranging segments in parallel, and a structure is formed in a curved shape along the tunnel wall when viewed in the longitudinal direction of the tunnel. The present invention relates to the structure of a horizontal hole forming part in a tunnel provided in such a state.

In the above tunnel, the horizontal hole forming structure is formed into a curved shape along the tunnel wall in the longitudinal direction of the tunnel, which has the advantage of minimizing narrowing of the tunnel due to the structure. However, as shown in FIG. 8, conventionally, the structure 5 was connected and fixed to a connecting part 14 specially provided in the segment 1, so that the notch 4 of the tunnel wall 2 was As the segment 1d to be placed nearby, it is necessary to prepare a segment 1d which has a different shape from the segment 1 placed in other places, which is economically disadvantageous.

The object of the present invention is to rationally modify the structure so that its installation can be done without requiring special segments;
To make a wall strong while making the structure easy to transport.

The characteristic configuration of the present invention is that in the above-mentioned structure of the horizontal hole forming part in the tunnel, the structure includes a first member forming the upper part of the horizontal hole,
A state in which the upper end side is in contact with the downward end surface of the segment located above the notch, and both ends in the longitudinal direction of the tunnel are wrapped in the thickness direction of the segment located on the lateral side of the notch. a second member connected to the segment connecting portion of the segment and forming a lower part of the horizontal hole, the lower end side of which is in contact with the upward end surface of the segment located below the notch, and , both ends in the longitudinal direction of the tunnel are arranged so as to wrap in the thickness direction of the segment located on the lateral side of the notch, and are connected to the segment connecting part of the segment, and the center of the horizontal hole The upper end surfaces of third and fourth members forming a section are in contact with the lower end surface of the first member, and the lower end surfaces of the third and fourth members are in contact with the upper end surface of the second member, and
the first segment in a state in which each segment wraps in the thickness direction of the segment located on the lateral side of the notch;
and the second member is distributed and arranged on both ends of the tunnel in the longitudinal direction, and is connected to the segment connecting portion of the segment.

In other words, since the structure is connected to a connection part provided on the segment for connection with another adjacent segment, it is possible to eliminate the need for special segments conventionally used for attaching the structure. Tunnels with side holes can be obtained at low cost.

Incidentally, the elimination of the need for special segments can also be achieved by configuring the entire structure to be fitted into a notch in the tunnel wall and connected to the segment connecting portions of the segments surrounding the notch. However, since a large load is applied to the parts located on both sides of the horizontal hole due to the load from above and the external pressure directed toward the center of the tunnel, in the case of the above-mentioned inset structure, the wall support against the load is strong. In this case, it becomes necessary to increase the wall thickness at both ends of the tunnel in the longitudinal direction, resulting in the problem of increased weight. however,
In the present invention, the upper end side of the first member is notched and the lower end face of the upper segment is cut out, the lower end side of the second member is notched and the upper end face of the lower segment is cut out, and the upper end faces of the third and fourth members are cut out. on the lower end surface of the first member,
By bringing the lower end surfaces of the third and fourth members into contact with the upper end surfaces of the second member, the structural body can firmly support the load from above. 1st and 2nd location
By wrapping both ends of the member and the third and fourth members in the thickness direction of the segment, both the structure and the segment provide strong support against external pressure directed toward the center of the tunnel. The hole-forming part is strongly supported against both loads by the reinforcing action of the structure, and the wall can be made strong, and the wall thickness at both ends of the structure can be made relatively thin. In addition to this, by making the structure a unit configuration consisting of four members, first to fourth,
The structure can be easily transported in terms of both weight and handling.

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

As shown in Figures 1 and 2, segment 1
are arranged in parallel in the circumferential direction of the tunnel, and adjacent segments 1 are connected with bolts to form an annular segment row, and as the tunnel is dug, these segment rows are added in the excavation direction and mutually connected. By connecting adjacent segments 1 with bolts, a tunnel wall 2 made of segments along the ground wall surface of the tunnel is formed, and a subway tunnel is constructed.
Then, with the support member 3 acting as shown in FIG. A structure 5 formed in a curved shape is attached to the tunnel wall 2, and a horizontal hole 6 is formed in the notch 4 to provide a communication opening between a platform (not shown) provided in the tunnel and a passage 7 thereto. It has been formed.

Note that the support member 3 is removed after the structure 5 is attached.

The structure 5 includes a first member 8 forming the upper part of the horizontal hole 6, a second member 9 forming the lower part of the horizontal hole 6, and a center portion of the horizontal hole 6 so as to facilitate handling during transportation. The third and fourth members 10, 1 forming a part
It is divided into four structural units (1), and these are arranged and attached as shown in FIGS. 2 to 6.

That is, in the first member 8, a portion 8a on the upper end side excluding both ends in the longitudinal direction of the tunnel is the notch 4.
It is in contact with the downward end surface of the segment 1a located above, and is arranged so that both ends in the longitudinal direction of the tunnel are wrapped in the thickness direction of the segment 1b located on the lateral side of the notch 4, The segments 1b are connected to each other by bolts using bolt holes 12 provided as connecting portions for connecting adjacent segments. Then, the second member 9 is brought into contact with the upward end surface of the segment 1c located below the notch 4 at the lower end side, except for both ends in the tunnel longitudinal direction, and both ends in the tunnel longitudinal direction are notched. Segment 1b located on the lateral side of notch 4
A bolt hole 12 is arranged so as to wrap in the thickness direction of the segment 1b, and has a bolt hole 12 in the segment 1b as a connecting part for connecting the segment adjacent to the segment 1b, similarly to the first member 8, although not shown.
They are connected using bolts. The upper end surfaces of the third and fourth members 10 and 11 are in contact with the lower end surface of the first member 8, and the lower end surfaces of the third and fourth members 10 and 11 are in contact with the upper end surface of the second member 9, respectively, and
Segments 1 each located laterally of the notch 4
b, and is arranged on both ends of the tunnel longitudinal direction of the first and second members 8, 9 in a state of wrapping in the thickness direction thereof, and serves as a connecting portion for connecting the segment adjacent to the segment 1b. Bolt connections are made using the bolt holes 12 that are provided.

In addition, the through hole 1 shown in FIGS. 2, 5, and 6
3 is for operating the connecting bolt.

In the above implementation configuration, the overlap distance between the first to fourth members 8, 9, 10, 11 and the segment 1b is set to be equivalent to the width of one segment 1b. Depending on the strength of the segment 5, the wrap margin may be set to be smaller or larger than the segment width.

The structure of the lateral hole forming portion according to the present invention can also be applied to forming various lateral holes such as various tunnels for water conduits, tunnels branching from the main tunnel, escape holes, and the like.

[Brief explanation of drawings]

The drawings show an embodiment of the structure of the lateral hole forming part in a tunnel according to the present invention, FIG. 1 is a cross-sectional view of the tunnel, FIG. 2 is a front view of the lateral hole forming part, and FIG. 4 is a cross-sectional view of FIG. 2, FIG. 5 is a cross-sectional view of FIG. 2, and FIG. 6 is a cross-sectional view of FIG.
The figure is an explanatory diagram of the notch formation procedure. FIG. 8 is a sectional view showing the conventional structure of the horizontal hole forming portion. 1, 1a, 1b, 1c...segment, 2...
Tunnel wall, 4... Notch, 5... Structure, 6...
...Horizontal hole, 8...First member, 9...Second member, 10
...Third member, 11... Fourth member, 12... Connection portion.

Claims (1)

[Claims] 1. A structure 5 in which a horizontal hole 6 is formed in a notch 4 of a tunnel wall 2 formed by arranging segments 1, 1a, 1b, and 1c in parallel is curved along the tunnel wall 2 when viewed in the longitudinal direction of the tunnel. In the tunnel provided in the shape, the first member 8 forming the upper part of the horizontal hole 6 is connected to the first member 8 of the segment 1a whose upper end side is located above the notch 4 to form the structure 5. The segment 1b is in contact with the downward end face, and is arranged such that both ends in the longitudinal direction of the tunnel are wrapped in the wall thickness direction of the segment 1b located on the lateral side of the notch 4. A second member 9 connected to the connecting part 12 and forming the lower part of the horizontal hole 6, the lower end side of which is in contact with the upward end surface of the segment 1c located below the notch 4, and both ends in the longitudinal direction of the tunnel. The segment 1b is arranged so as to overlap in the thickness direction of the segment 1b located on the lateral side of the notch 4, and
The third and fourth members 10 and 11, which are connected to the segment connecting portion 12 of the segment 1b and form the central part of the horizontal hole 6, are connected so that their respective upper end surfaces are connected to the first
The lower end surface of the member 8 is in contact with the upper end surface of the second member 9, and the segments 1b are located on the lateral side of the notch 4 and in the thickness direction thereof. The first and second
The structure of the horizontal hole forming part in the tunnel, which is distributed and arranged on both ends of the tunnel longitudinal direction of the members 8 and 9, and is connected to the segment connecting part 12 of the segment 1b.