JP3630801B2 - Tunnel lining element - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an element for tunnel lining suitable for use in a three-dimensional intersection type tunnel that mainly passes under a road or under a track.
[0002]
[Prior art]
As a method of constructing a tunnel that crosses three-dimensionally under a railroad or road, instead of a construction method that constructs an integral structure lining body that is not divided by on-site cast concrete, a rectangular tunnel with a long cross-sectional shape A URT (Under Railway Tunnel) method of construction using a lining element is known.
In this construction method, first, the element was set toward the natural ground at the starting shaft, and this element was disposed at the tip of the element while being started horizontally to the natural ground by an excavation device arranged behind the element. By excavating the earth and sand of the natural ground with a cutter, the element is advanced and penetrated and buried in the natural ground along the tunnel lining section (for example, gate type, arch type), and the concrete is filled in and between the elements Then, the tunnel lining body is constructed by hardening and then the earth and sand inside the tunnel lining body is excavated and removed to construct the tunnel.
[0003]
[Problems to be solved by the invention]
By the way, when digging the tunnel lining body, in order to secure a joint space formed by the meshing joints between adjacent elements, a hilling panel called a slide plate is attached to the side portion of the element, and then digging. By excavating the element adjacent to this excavated element, extruding this mountain stop panel in the excavating direction and collecting it at the reaching shaft, without leaving soil in the joint space formed between the elements The elements are connected to each other, but if there is no reaching shaft, this mountain retaining panel cannot be recovered, so this mountain retaining panel cannot be used, and a large amount of soil and sand is injected into the joint space. There is a problem that the operation such as washing with water has to be performed, and this work requires a lot of labor and leads to an increase in the construction period.
[0004]
The present invention has been made in view of the above circumstances, and can be used for tunnel lining that can construct a tunnel by propelling an element extremely easily without causing an increase in the construction period even in a site without a shaft. The purpose is to provide elements.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the tunnel lining element according to claim 1 is inserted along the lining section of the tunnel to be constructed, and each side portion is connected to constitute a tunnel lining body. A hollow tunnel lining element, which is provided with joint portions that can be joined to other adjacent elements on the upper and lower sides of the element body, and the joint on one side of the element body. Between the parts, a closing plate having a thickness substantially equal to the protruding dimension of the joint portion is provided, and the closing plate provided in the existing element is adjacent to the existing element and other elements are connected to each other. When propelled, it is characterized by being peeled off by the propelled element.
[0006]
The tunnel lining element according to claim 2 is provided in the tunnel lining element according to claim 1, wherein the tunnel lining element is provided at the tip of the element main body and propelled adjacent to the existing element. A pad cutter for peeling off the closed block plate from the element body is detachably attached.
The tunnel lining element according to claim 3 is the tunnel lining element according to claim 1 or 2, wherein the closure plate includes a porous cured body provided with a plurality of the closing plates in the longitudinal direction of the element body. It consists of a molded board.
A tunnel lining element according to a fourth aspect is the tunnel lining element according to any one of the first to third aspects, wherein a side portion of the element body has a truss structure.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the tunnel lining element of the present invention will be described.
In FIG. 1, reference numeral 1 denotes a tunnel lining element. This element 1 is composed of a long tube having a trapezoidal cross section, and includes an element body 2, a joint portion 3 formed vertically on one side of the element body 2, and the element body 2. It has a joint part (joint part) 4 formed on the side part and joined to the joint part 3.
The element 1 for tunnel lining is preliminarily provided with an element pad (closing plate) 5 having a thickness substantially equal to the protruding dimension of the joint portion 3 between the joint portions 3 formed at the upper and lower sides thereof. ing. These element pads 5 are made of a porous hardened material such as polystyrene foam, have sufficient durability during propulsion, have low friction with the natural ground, and are easy to crush and discharge with earth and sand. It consists of a board, and a plurality of these element pads 5 are provided along the longitudinal direction at the side of the element body 2.
The element pads 5 are fixed to the side surfaces of the joint portion 3 and the element body 2 constituting the element 1 by an adhesive 6.
[0008]
When the other element 1 is propelled and joined next to the element 1 having the element pad 5, the pad cutter 11 is attached to the side portion at the tip of the element 1 to be propelled and propelled.
As shown in FIG. 2, the pad cutter 11 has a cutter portion 13 formed with a tapered surface 12 that is gradually inclined in the inner direction of the element body 2 from the tip to the rear. It is arranged near the side surface of the element body 2 of the adjacent element 1.
Then, when the element 1 to which the pad cutter 11 is attached is propelled, the element pad 5 is peeled off from the element body 2 by the cutter portion 13 of the pad cutter 11 of the element 1 as shown in FIG. The peeled element pad 5 is crushed by a digging cutter provided at the tip of the element body 2 and discharged from the rear side of the element 1 together with the excavated earth and sand.
[0009]
Thus, according to the tunnel lining element 1 of the above-described embodiment, the joint space between the elements 1 in the joint space between the elements 1 can be constructed even at a site where a reaching shaft cannot be constructed on the front side in the propulsion direction. Since the earth is completely removed, the concrete can be surely placed between the elements 1 very easily, and sufficient bonding strength can be ensured.
In other words, even when the reaching shaft cannot be constructed, the tunnel can be laid without causing a long construction period and requiring a great deal of labor.
[0010]
In particular, as shown in FIG. 4, as the element 1, when the side of the element body 2 has a truss structure, the adjacent elements 1 are spatially connected so that concrete is integrally filled. However, there is a risk that chemicals for groundwater and soil improvement may enter during propulsion. For this reason, in the case of such an element 1, by covering the truss surface tightly with the element pad 5, the element pad 5 can reliably prevent the entry of groundwater or chemical into the element body 2. .
Note that the cross-sectional shape of the element 1 is not limited to the above-described embodiment, but may of course be a rectangular cross-section (see FIG. 3) such as an element for a portal tunnel. is there.
[0011]
【The invention's effect】
As described above, according to the tunnel lining element of the present invention, the following effects can be obtained.
According to the tunnel lining element according to claim 1, the closing plate of the existing element can be peeled off by the element to be propelled, and a joint space can be formed between the elements. Even at sites where a shaft cannot be constructed, it is extremely easy to reliably form a joint space between elements and ensure the strength of the joint space by securely joining the elements and placing concrete. Can be performed.
In other words, even when the reaching shaft cannot be constructed, the tunnel can be laid without causing a long construction period and requiring a great deal of labor.
[0012]
According to the tunnel lining element of the second aspect, by attaching the pad cutter to the tip of the element body and propelling it, the closure plate attached to the existing element is very easily peeled off. It can be crushed and discharged together with the ground by the excavation cutter of the element body propelling the peeled closing plate.
According to the element for tunnel lining of claim 3, the closing plate is formed of a porous cured body that is lightweight, has a certain degree of strength, and is easily crushed. Without incurring, it can be peeled off very easily and crushed and discharged together with the ground, further facilitating the work.
[0013]
According to the element for tunnel lining according to claim 4, even if the side of the element body has a truss structure and is lightened without lowering the strength, the side is securely closed by the closing plate. In this state, the chemical solution injected into the ground for ground improvement can be reliably prevented from entering from the side of the element body of the truss structure.
[Brief description of the drawings]
FIG. 1 is a perspective view of a tunnel lining element for explaining the configuration and structure of a tunnel lining element according to an embodiment of the present invention.
FIG. 2 is a perspective view of the pad cutter for explaining the shape of the pad cutter provided in the tunnel lining element according to the embodiment of the present invention.
FIG. 3 is a schematic plan view of an element for explaining a propulsion state of the tunnel lining element according to the embodiment of the present invention.
FIG. 4 is a perspective view of a tunnel lining element for explaining the configuration and structure of a tunnel lining element according to another embodiment of the present invention.
[Explanation of symbols]
1 Element 2 Element body 3 Joint part 4 Joint part 5 Element pad (closing plate)
11 Pad cutter 12 Tapered surface

Claims (4)

It is a hollow tunnel lining element that constitutes a tunnel lining body by inserting along the lining section of the tunnel to be constructed, and connecting the respective sides to each other,
Joint parts that can be joined to other adjacent elements are provided above and below the side of the element body.
Between the joint portions on one side of the element body, a closing plate having a thickness substantially equal to the protruding dimension of the joint portion is provided,
A tunnel lining element, wherein a closing plate provided on an existing element is peeled off by the driven element when the other element is driven adjacent to the existing element. The element body is detachably mounted with a pad cutter at its distal end for peeling off a closing plate provided on the existing element from the element body when propelled adjacent to the existing element. The tunnel lining element according to claim 1. 3. The tunnel lining element according to claim 1, wherein the closing plate comprises a board formed from a plurality of porous hardened bodies provided in the longitudinal direction of the element body. The element for tunnel lining according to any one of claims 1 to 3, wherein the element body has a truss structure at a side portion thereof.

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