JP2004238917A - Tunnel lining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel lining structure attaining cost reduction and shortening of a construction period. <P>SOLUTION: This tunnel lining structure is provided with a lining slab 1 of portal cross section formed by lining up a plurality of lining elements 2 in the outer peripheral direction of excavated cross section and pressing them into the natural ground. A pair of lining elements 21 positioned at the right and left feet of the lining slab 1 respectively have extended parts 21a with both ends extended on the front side and rear side from the lining slab, and the extended parts 21a are respectively supported by struts 3. The pair of lining elements 21 are jointed to the strut 3. Further, the pair of lining elements 21 have functions and bearing force for reducing flexure and supporting earth pressure applied to the lining elements at a side face part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel lining structure used when constructing a three-dimensionally intersecting tunnel below a railway or road.
[0002]
[Prior art]
As a conventional tunnel lining structure, for example, as shown in FIG. 3, a plurality of lining elements are juxtaposed in the outer circumferential direction of the excavated cross section and penetrated into a natural ground, or a box type lining plate (For example, refer patent document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-8964
[Problems to be solved by the invention]
By the way, in the tunnel lining structure with a cross-section gate type, the lining plate has a protruding portion provided with the foot of the lining plate protruding downward from the outer portion of the tunnel. During excavation, the passive earth pressure of this protruding portion is provided. It is supposed to counter the side pressure that the lining plate receives.
However, after completion of excavation, it is possible to counter the side pressure by driving the lower floor slab, and it is not necessary to counter the side pressure by the protruding portion. That is, the projecting portion that is temporary is constructed with a plurality of lining elements, as is the case with the portions other than the projecting portion that is permanently installed, and there is a problem that effective utilization of resources cannot be sufficiently achieved.
Moreover, since the projecting part projects downward from the outer part of the tunnel, it is necessary to provide a vertical shaft for penetrating the lining element into the natural ground deeper than the outer part of the tunnel. The increase leads to an increase in cost and a longer construction period.
[0005]
On the other hand, in the cross-section box type tunnel lining structure, there is no problem like the cross-section gate type tunnel lining structure, but the lower floor slab is constructed with a plurality of lining elements, not on-site concrete, It is not necessarily economical.
[0006]
Therefore, an object of the present invention is to provide a tunnel lining structure capable of reducing the cost and shortening the construction period.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a tunnel lining structure according to the present invention includes a tunnel having a cross-sectional gate-type lining plate in which a plurality of lining elements are juxtaposed in an outer peripheral direction of an excavated cross section and penetrated into a natural ground. The lining structure has a pair of lining elements located at the left and right feet of the lining plate, and both ends thereof have extension portions extending from the lining plate to the front side and the rear side, respectively. The parts are supported by struts, respectively.
[0008]
According to such a tunnel lining structure, since the extension part of the pair of lining elements provided by extending the foot of the lining plate back and forth is supported by the strut, the lateral pressure due to excavation is the strut. It will be countered.
[0009]
Therefore, it is not necessary to make the foot of the lining plate protrude downward from the outer part of the tunnel to counter lateral pressure, and the temporary part is constructed of the same material as the main part, or the lining element is deeper than the outer part of the tunnel. The situation where a shaft for penetrating the ground is provided is effectively avoided. This makes it possible to reduce costs and shorten the construction period.
[0010]
From such a technical point of view, in order to enhance the reliability and stability of the struts against the lateral pressure, from the viewpoint of more fully reducing the cost and shortening the construction period, the pair of lining elements are: It is preferable to be joined to the strut.
[0011]
Moreover, from the viewpoint of further reducing the cost and shortening the construction period as further enhancing the reliability and stability of the struts against the lateral pressure, the pair of lining elements reduce the deflection. It is preferable to have a function and a proof stress capable of supporting earth pressure acting on the lining element of the side portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
[Tunnel lining structure]
FIG. 1 is a perspective view showing the overall configuration of a tunnel lining structure according to an embodiment of the present invention, and FIG. 2 is a side view showing the overall configuration of the tunnel lining structure.
[0014]
In the present embodiment, the tunnel lining structure is configured to include a lining plate 1 having a cross-sectional gate shape as shown in FIG.
Here, the cross-section gate-type lining plate 1 is configured such that a plurality of lining elements 2 are arranged in parallel to the outer peripheral direction of the excavation cross section and penetrated into the natural ground 4 as shown in FIG. .
[0015]
Moreover, as shown in FIG.1 and FIG.2, as shown in FIG.1 and FIG.2, a pair of lining element 21 located in the right and left foot of the lining plate 1 is the extension part from which the both ends extend to the front side and the rear side. 21a, and the extending portions 21a are supported by the struts 33, respectively.
[0016]
That is, since the extension portions 21a of the pair of lining elements 21 provided by extending the feet of the lining plate 1 back and forth are supported by the struts 3, the struts 3 can counter lateral pressure during excavation. In addition, after excavation is completed, the strut 3 can be integrated with the lower floor slab (not shown) to counter lateral pressure.
[0017]
In other words, according to this tunnel lining structure, unlike the conventional cross-section box type tunnel lining structure, it is not necessary to protrude the foot of the lining plate 1 downward from the outer portion of the tunnel to counter the lateral pressure. It has become.
[0018]
Of course, as the pair of lining elements 21, it is not necessary that only the extending portions 21a are supported by the struts 3, and the struts 3 supporting the extending portions 21a are simultaneously retracted inside the lining plate 1. It does not matter even if it is supposed to support the part.
[0019]
Here, the pair of lining elements 21 are joined to the strut 3 although not shown.
[0020]
As a result, the reliability and stability of the struts 3 against the lateral pressure are increased, and as a result, the cost can be reduced and the construction period can be shortened more sufficiently.
[0021]
Specifically, a pair of lining elements 21 are joined to the struts 3 by joining the reinforcing bars protruding from the pair of lining elements 21 to the strut 3 side to the reinforcing bars of the struts 3. It is like that.
[0022]
Here, as a method for joining the reinforcing bars of the pair of lining elements 21 and the reinforcing bars of the struts 3, any method or means may be used as long as both reinforcing bars can be joined to each other. It may be selected appropriately according to the reliability and stability. For example, in addition to a butt joint including a lap joint and a welded joint such as arc welding or gas welding, a mechanical joint such as a color pressure bonding can be used.
[0023]
In addition, as shown in FIG. 1, the pair of lining elements 21 is configured to have a function and a proof stress capable of reducing the bending and supporting the earth pressure acting on the lining element 2 on the side surface portion. ing.
[0024]
This further increases the reliability and stability of the struts 3 against the side pressure, and as a result, it is possible to further reduce costs and shorten the construction period.
[0025]
Specifically, as shown in FIG. 1, first, each lining element 2 of a pair of lining elements 21 is provided in a double by arranging two lining elements 2 side by side, thereby providing a pair of lining elements. 21 is reinforced. In addition, the inner lining element 2 itself is reinforced by the PC steel material 22 among the lining elements 2 provided in double. Thereby, the bending of a pair of lining element 21 becomes small.
[0026]
Here, the lining elements 2 are not limited to those provided in double, and are required regardless of the reinforcement method as long as the bending of the pair of lining elements 21 can be reduced. The strut 3 may be appropriately selected depending on the reliability and stability of the strut 3. For example, a method of reinforcing each lining element 2 provided in a single with a PC steel material or reinforcing a steel plate on the inner surface with a thick steel plate or reinforcing it as a long rectangular cross section can be used.
[0027]
That is, according to such a tunnel lining structure, since the extended portions 21a of the pair of lining elements 21 provided by extending the feet of the lining plate 1 back and forth are supported by the struts 3, excavation is performed. The lateral pressure due to will be countered by the strut 3.
[0028]
Therefore, it is no longer necessary to make the foot of the lining plate 1 protrude downward from the outer part of the tunnel to counter the lateral pressure, and the temporary part is constructed of the same material as the main part or the lining is performed deeper than the outer part of the tunnel. A situation in which a shaft for penetrating the element 2 into the natural ground 4 is effectively avoided, thereby making it possible to reduce costs and shorten the construction period.
[0029]
[Tunnel lining method]
In the present embodiment, the tunnel lining method is constituted by each process of the first process and the second process, although not shown. Hereafter, each process is demonstrated, referring FIG.1 and FIG.2.
[0030]
(1) First Step This is a step of constructing the cross-section gate-type lining plate 1 so that the left and right feet extend forward and backward prior to tunnel excavation.
[0031]
Specifically, a plurality of lining elements 2 are arranged in parallel to the outer peripheral direction of the excavation cross section and penetrate into the natural ground 4.
[0032]
Here, the covering element 2 longer than the other covering elements 2 is positioned at the left and right feet of the covering plate 1 so as to extend back and forth from the covering plate 1. The long lining element 2 becomes a pair of lining elements 21, and a portion of the pair of lining elements 21 that extends forward and backward from the lining plate 1 becomes an extending portion 21 a.
[0033]
Then, the inside of the pair of lining elements 21 is reinforced with the PC steel material 22 so that the bending of the pair of lining elements 21 is reduced.
[0034]
(2) Second step This is a step of attaching the strut 3 to the left and right feet extending forward and backward from the lining plate 1 prior to tunnel excavation.
[0035]
Specifically, first, the reinforcing bars of the struts 3 are assembled, and the short reinforcing bars are fixed to the inner surfaces of the pair of lining elements 21. Subsequently, the reinforcing bars projecting from the pair of lining elements 21 to the strut 3 side and the reinforcing bars of the strut 3 are joined to each other by a mechanical joint or the like. Then, the form of the strut 3 is assembled and the concrete is placed.
[0036]
And when the concrete of the strut 3 hardens | cures, the tunnel lining method which concerns on this Embodiment is complete | finished.
[0037]
That is, according to such a tunnel lining method, the extended portions 21a of the pair of lining elements 21 provided in the first step are supported by the struts 3 in the second step prior to tunnel excavation. Therefore, the lateral pressure due to excavation is countered by the struts 3.
[0038]
Therefore, it is not necessary to make the foot of the lining plate 1 protrude downward from the outer part of the tunnel to counter the lateral pressure, and the temporary part is constructed with the same material as the main part or the lining is performed deeper than the outer part of the tunnel. A situation in which a shaft for penetrating the element 2 into the natural ground 4 is effectively avoided, thereby making it possible to reduce costs and shorten the construction period.
[0039]
【The invention's effect】
According to the tunnel lining structure according to the present invention, it is not necessary to make the foot of the lining plate protrude downward from the outer portion of the tunnel to counter the side pressure, and it is possible to reduce costs and shorten the construction period. Become.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a tunnel lining structure according to an embodiment of the present invention.
FIG. 2 is a side view showing an overall configuration of a tunnel lining structure according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view (FIG. 3 (a) is a gate type and FIG. 3 (b) is a box type) showing a schematic configuration of a conventional tunnel lining structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Covering plate 2 Covering element 3 Strut 4 Ground mountain 21 A pair of cover element 21a Extension part 22 PC steel

Claims (3)

A tunnel lining structure with a cross-section gate-type lining plate formed by penetrating a natural ground with a plurality of lining elements arranged in parallel in the outer circumferential direction of the excavation cross section,
A pair of lining elements located at the left and right feet of the lining plate each have an extending portion extending from the lining plate to the front side and the rear side, and the extending portions are formed by struts. Tunnel lining structure characterized by being supported by each. The tunnel lining structure according to claim 1, wherein the pair of lining elements are joined to the struts. The pair of lining elements are provided with a function and a proof stress capable of reducing bending and supporting earth pressure acting on the lining elements on the side surface portions. Tunnel lining structure.

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