JP4455687B2 - Structure of continuous tunnel and construction method of continuous tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a continuous tunnel that connects a plurality of tunnels in a horizontal direction, and a method for constructing the continuous tunnel.
[0002]
[Prior art]
A method using a DOT shield machine or an MF shield machine is known in order to construct a plurality of tunnels connected in the horizontal direction, such as a duplex type or a triple type.
A boundary portion between tunnels using these shield machines is supported by a known support member such as a pillar.
[0003]
[Problems to be solved by the invention]
The above-described conventional continuous tunnel construction method has the following problems.
<A> A continuous tunnel constructed by a conventional method has a pillar for supporting the tunnel at the boundary between the tunnels, and therefore cannot ensure a wide continuous space.
<B> Since there are pillars at the boundary between tunnels, frequent and free lane changes are restricted when, for example, continuous tunnels are used on roads. Therefore, they are not suitable for road junctions and junctions. Also, when used in a railway traserver unit, the pillars are inconvenient and are not suitable.
[0004]
OBJECT OF THE INVENTION
The present invention has been made in view of the above-described problems. The structure of a continuous tunnel that makes it possible to construct a tunnel that secures a wide internal cross section in the horizontal direction without using any support in the space, and It aims at providing the construction method of a continuous tunnel.
[0005]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a continuous tunnel structure in which a part of a tunnel body constructed in advance and a part of a tunnel body that follows are overlapped in the longitudinal direction of the tunnel. And a reinforcing beam for connecting and supporting the boundary between the two tunnels along the longitudinal direction of the tunnel. A tunnel structure and a tunnel construction method are provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The structure of the continuous tunnel will be described below with reference to the drawings.
The continuous tunnel is a tunnel configured by connecting a plurality of tunnel frames in the longitudinal direction of the tunnel and communicating the internal space.
As shown in Fig. 6, between the tunnels of both tunnels 1 and 2, there are two borders (upper and lower necks) that are continuous in the tunnel longitudinal direction.
When the casings of the tunnels 1 and 2 are connected in this way, the internal space is widened and the distance between the support members is widened, so that the bending moment (deflection) applied to the tunnels 1 and 2 is increased.
As a conventional technique for suppressing the bending moment (deflection) below an allowable amount, a coping method is known in which a support column is disposed in the middle (boundary portion).
In contrast to the prior art, the present invention constructs reinforcing beams 5 and 5 straddling between the tunnels 1 and 2 along the tunnel longitudinal direction inside the tunnel housing located at the boundary (upper and lower two places). By doing so, the rigidity of the frame of both the tunnels 1 and 2 is increased.
The two tunnels 1 and 2 that are connected and supported by the reinforcing beam 5 do not require a support member such as a column that is conventionally used between the boundary portions to support the two tunnels 1 and 2.
As a result, the continuous tunnel can secure a continuous and wide space 6 between the two tunnels 1 and 2 without any obstacles.
In order to increase the rigidity of the tunnels of both tunnels 1 and 2, for example, instead of simply constructing the reinforcing beam with reinforced concrete, it provides a harder beam that is harder to bend by known means such as a reinforced steel structure that is covered with a steel plate. It is possible to increase the height of the reinforcing beam itself.
The continuous tunnel is not limited to a structure in which two tunnels 1 and 2 as shown in FIG. 6 are connected, and can be configured by appropriately connecting a plurality of tunnels.
[0007]
[Building method 1]
Hereinafter, an example of a method for constructing a continuous tunnel will be described with reference to the drawings.
[0008]
<A> Construction of the preceding tunnel As shown in FIG. 1, the preceding tunnel 1 is a normal circular tunnel constructed by excavating and constructing the segment 12 while assembling the segment 12.
The preceding tunnel 1 is configured with a removal segment 3 at the side overlapping with a later tunnel 2 described later.
Further, the removal block 4 is assembled to the tail end 13 of the preceding tunnel 1 located at the junction with the removal segment 3.
By removing the removal block 4 from the preceding tunnel 1, a connecting portion with the subsequent tunnel 2 described later is formed at the tail end portion 13 of the preceding tunnel 1.
[0009]
<B> Construction of the trailing tunnel As shown in FIG. 2, the trailing tunnel 2 is a non-circular tunnel that is constructed by excavating the moon-shaped trailing shield machine 21 while assembling the segments 22.
At this time, the steel shell of the trailing shield 21 extends thickly to the overlapping portion with the preceding tunnel 1, and has a structure capable of being scraped.
As shown in FIG. 3, the shape of the trailing tunnel 2 is made to be line-symmetric, for example, by removing the removal segment 3 from the preceding tunnel 1 described above.
The tail end portion 23 of the trailing tunnel 2 is matched with the tail end portion 13 of the preceding tunnel 1 from which the removal block 4 has been removed in the above process.
As a result, the preceding tunnel 1 and the succeeding tunnel 2 are supported by the removal segment 3.
[0010]
<C> Partial Removal of Removal Segment As shown in FIG. 4, the removal segment 3 that is a part of the preceding tunnel 1 is, for example, a segment divided in a direction perpendicular to the tunnel axis direction.
In this case, the removal segment 3 is used to construct a reinforcing beam 5 to be described later while supporting the preceding tunnel 1 and the succeeding tunnel 2 by removing the preceding removal portion 32 while leaving the row removal portion 31. The space 33 can be secured.
The removal segment 3 can be removed while sliding from the tail end 13 of the preceding tunnel 1.
In addition, it is conceivable to secure a space for constructing the reinforcing beams 5 and 5 while supporting the preceding tunnel 1 and the succeeding tunnel 2 by alternately removing the removal segments 3 every other ring.
[0011]
<D> Construction of reinforcing beam As shown in FIG. 5, the reinforcing beam 5 extends along the tunnel longitudinal direction inside the tunnel housing located at the boundary (upper and lower constriction) between the preceding tunnel 1 and the succeeding tunnel 2. This is a member for straddling the two tunnels 1 and 2 to increase the rigidity of the frame of the two tunnels 1 and 2 and to connect and support the two tunnels 1 and 2.
By constructing the reinforcing beam 5, it is not necessary to support the boundary between the preceding tunnel 1 and the succeeding tunnel 2 with a known support member such as a column or a wall.
The reinforcing beam 5 is a known beam constructed of, for example, reinforced concrete.
[0012]
<E> Removal of all removal segments As shown in FIG. 5, the boundary between the preceding tunnel 1 and the subsequent tunnel 2 is reinforced by the reinforcing beams 5, 5, so the subsequent removal portion 31 of the removal segment 3. Can be removed.
Thereby, as shown in FIG. 6, there is no support member such as a pillar or a wall at the boundary between the preceding tunnel 1 and the following tunnel 2, and there is no continuous obstacle 6 between the tunnels 1 and 2 without any obstacles. Can be secured.
[0013]
[Construction method 2]
In construction method 1, the vertically segmented removal segments are removed one by one, and the remaining segments support the preceding and succeeding tunnels while removing the segments at the tunnel boundary (upper and lower necks) of the space. Repeat the work of constructing the reinforcing beam.
An example in which the tunnel boundary is reinforced and connected by replacing the removal segment with a reinforcing beam in the above operation has been described.
On the other hand, this construction method is as follows.
[0014]
<A> Supporting the preceding tunnel As shown in FIG. 7, after constructing the succeeding tunnel 2 so as to overlap the preceding tunnel 1 as in the construction method 1, it is formed at the tail ends 13 and 13 of the preceding tunnel 1. A temporary support column 7 is disposed between the horizontal seats 14 and 14.
Thereby, the preceding tunnel 1 supported by the removal segment 3 is supported by the temporary support column 7.
Thus, the preceding tunnel 1 is supported by the temporary support column 7, and the trailing tunnel 2 is supported by the removal segment 3 positioned between the horizontal seats 24, 24 formed at the tail ends 23, 23.
The preceding tunnel 1 and the succeeding tunnel 2 are connected by removing the removal block 4 when constructing the succeeding tunnel 2, as in the construction method 1.
[0015]
<B> Support of the trailing tunnel As shown in FIG. 7, the trailing tunnel 2 is supported by the removal segment 3 located between the horizontal seats 24, 24 of the tail ends 23, 23, but is shown in FIG. Thus, by arranging the temporary support column 7 between the horizontal seats 24, 24, the trailing tunnel 2 can be supported and the removal segment 3 can be removed.
Thereby, the space for constructing the reinforcing beam 5 described later can be secured.
[0016]
<C> Construction of Reinforced Beam As shown in FIG. 9, while the preceding tunnel 1 and the succeeding tunnel 2 are supported by the temporary support column 7, the boundary between the preceding tunnel 1 and the succeeding tunnel 2 (upper and lower two locations) The reinforcing beams 5 and 5 straddling the two tunnels 1 and 2 are constructed on the inner side of the tunnel housing located at) to connect and support the two tunnels 1 and 2.
[0017]
<D> Removal of Temporary Struts As shown in FIG. 9, by reinforcing the boundary between the preceding tunnel 1 and the succeeding tunnel 2 with reinforcing beams 5 and 5, the temporary struts 7 and 7 become unnecessary.
By removing the temporary struts 7 and 7, it is possible to secure a continuous and wide space without obstacles between the connected tunnels 1 and 2.
[0018]
【The invention's effect】
The present invention can obtain the following effects by the configuration as described above.
<I> Since the rigidity of the boundary part between the tunnels is enhanced by the reinforcing beam, no support member such as a column for supporting the boundary part is required.
Therefore, it is possible to secure a continuous wide space without obstacles between the two tunnels, and the range of use of the continuous tunnel is greatly expanded.
<B> Since a support member is not required at the boundary between tunnels, for example, when a continuous tunnel is used on a road, a wide space that does not affect the frequent and free lane change can be secured. It can be used for road junctions and junctions.
Similarly, it is suitable for a railway traserver unit.
<C> Since the boundary portion between the tunnels is not supported by the support member, an economic effect can be obtained.
<D> According to the method of the present invention, after the preceding shield machine has reached the reaching shaft, this shield machine can be reused as a subsequent shield machine by simple modification. It is more economical than building a continuous tunnel at once.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a preceding tunnel according to the present invention. FIG. 2 is an explanatory diagram when a subsequent tunnel is constructed. FIG. 3 is an explanatory diagram of a connected preceding tunnel and a subsequent tunnel. View from the arrow [Fig. 5] Illustration of reinforcing the overlapping part of the preceding and succeeding tunnels [Fig. 6] Illustration of the completed continuous tunnel [Fig. 7] Supporting the preceding tunnel using temporary columns Explanatory drawing at the time [Fig. 8] Explanatory drawing at the time of supporting the succeeding tunnel using the temporary strut [Fig. 9] Explanatory drawing at the time of removing the temporary prop supporting the preceding and succeeding tunnels

Claims (6)

A part of the tunnel body built in advance,
In the structure of the continuous tunnel where a part of the tunnel body that follows is overlapped in the tunnel longitudinal direction,
Inside the tunnel housing located at the boundary between the preceding and succeeding tunnels,
A reinforcing beam is provided to connect and support the boundary between both tunnels across the tunnel along the longitudinal direction of the tunnel,
The structure of a continuous tunnel. A part of the tunnel body built in advance,
In a method for constructing a continuous tunnel in which a part of the tunnel body that follows is overlapped in the tunnel longitudinal direction,
Consists of a removal segment that overlaps with the following tunnel of the preceding tunnel,
Build a trailing tunnel along the preceding tunnel,
In the space created by intermittently removing the removal segment,
Inside the tunnel housing located at the boundary between the preceding and succeeding tunnels,
It is characterized by constructing a reinforcing beam that connects and supports the boundary part of both tunnels across both tunnels along the longitudinal direction of the tunnel, and connects and supports both tunnels.
How to build a continuous tunnel. In the construction method of the continuous tunnel of Claim 2,
The removal segment that constitutes a part of the preceding tunnel housing is divided vertically and configured,
A part of the removal segment was removed in advance,
While supporting the boundary of both tunnels with the remaining removal segment, in the space created by removing the segment in advance,
Inside the tunnel housing located at the boundary between the preceding and succeeding tunnels,
It is characterized by constructing a reinforcing beam between both tunnels to connect and support both tunnels.
How to build a continuous tunnel. In the construction method of the continuous tunnel according to claim 2 or 3, the removal segment supporting the boundary portion between the preceding tunnel and the succeeding tunnel is removed and replaced with a temporary support column.
In the space created by replacing the removal segment with temporary columns,
Inside the tunnel housing located at the boundary between the preceding and succeeding tunnels,
After constructing a reinforcing beam between the two tunnels to connect and support both tunnels,
The temporary strut is removed,
How to build a continuous tunnel. In the construction method of the continuous tunnel in any one of Claims 2 thru | or 4,
Reinforcing beams built between the preceding and succeeding tunnels
It is constructed repeatedly so as to be continuous in the longitudinal direction of the tunnel,
How to build a continuous tunnel. In the construction method of the continuous tunnel in any one of Claims 2 thru | or 5,
A removal block for holding the connecting portion between the preceding tunnel and the preceding tunnel is disposed at the junction between the preceding tunnel and the removal segment,
When constructing the trailing tunnel,
It is characterized by removing the removal block in advance,
How to build a continuous tunnel.

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