JP2001288997A - Gauge for tunnel open section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gauge for tunnel open sections for controlling the amount of excavation of the tunnel, spraying thickness, and finished work quality as in a timbering section in a tunnel open section. SOLUTION: A gauge simple substance that shows dimensions along an area from the bottom part to the top part of a tunnel excavation schedule wall surface, has bottom and top plates at an end part, and has a sheath pipe in the axial direction of a tunnel is composed of a gauge body that connects its top plates while they confront each other and is arranged over the tunnel excavation scheduled wall surface, and a connection member that is connected to the sheath pipe of each gauge simple substance for composing the gauge body, and the sheath pipes having each gauge simple substance for composing the gauge body are connected by the connection member, thus arranging a plurality of gauge bodies at a specific interval in the axial direction of the tunnel in the gauge for tunnel open section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel-unsupported section gauge used for tunnel construction in a tunnel-unsupported section.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, there is a method of providing a support section covered with an arch-like support as a guide for tunnel excavation, concrete spraying, and spraying work (work), There is known a method in which a support is not provided at all in an unsupported section.

[0003]

The construction of a tunnel in the tunnel-unsupported section described above requires improvement in the following points. <B> In the unsupported section of the tunnel, there is no guide for tunnel excavation, so the amount of extra excavation increases. <B> The amount of concrete sprayed will increase as the amount of extra excavation increases. <C> If the thickness of the tunnel wall is to be controlled by the thickness of the sprayed concrete, the work quality (work quality) will deteriorate according to the excavation shape. <D> Conventionally, as a countermeasure, a plotter system using a laser or a method of using a normal steel shoring instead of a gauge has been known, but both are costly.
There were problems such as waste in the excavation cycle.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to control a tunnel excavation amount, a sprayed thickness, and a formed shape in a tunnel unsupported section in the same manner as in a supported section. To provide a gauge for an unsupported section of a tunnel.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, the present invention has a dimension extending from the bottom to the top of a wall to be excavated, and has a bottom plate and a top plate at each end. A gauge body having a sheath tube in the axial direction of the tunnel, the top plates of which are connected to each other by abutting each other, and a gauge body arranged over the wall to be excavated for tunneling, and a connection for connecting the sheath body of each gauge body constituting the gauge body. A plurality of gauge bodies are positioned at predetermined intervals in the tunnel axis direction by connecting the sheaths of the respective gauges constituting the gauge body by connecting members with a connecting member. , A gauge for sections without tunnel support.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a gauge for an unsupported section of a tunnel according to the present invention will be described with reference to the drawings.

<A> Overall Configuration As shown in FIG. 1, a gauge 1 for a tunnel unsupported section according to the present invention connects a top plate 21 of a pair of gauges 2 and 2 to each other to form a gauge body 3. A plurality of gauge bodies 3 are arranged in the axial direction of the tunnel, and each of the gauge bodies 3 is connected by a connecting member 4 to form an arch-shaped member. Hereinafter, each member constituting the gauge 1 for the tunnel unsupported section will be described.

<B> Gauge Unit As shown in FIG. 1, the gauge unit 2 is a semi-arch shaped member having a dimension extending from the bottom to the top of the wall 5 to be constructed with a tunnel. The gauge unit 2 can be made of, for example, a steel member similar to a well-known shoring work in which an angle having an L-shaped cross section is bent along the wall 5 where a tunnel is to be constructed. And the bottom plate 22 are respectively attached. The top plate 21 can be provided with a known connecting means such as, for example, previously opening a hole for bolting. A sheath 23 for attaching the gauges 2 and 2 arranged in the tunnel axial direction is attached to the gauge 2 in the tunnel axis direction. The sheath tube 23 is a known tube body into which, for example, an end of the connecting member 4 can be inserted in order to connect a plurality of gauge main bodies 3 described below at predetermined intervals by a connecting member 4 described later. The sheath tube 23 is provided on both the front and rear sides of the gauge 2 in the tunnel axial direction, so that the cage body 3 described later can be used.
Can be connected back and forth.

<C> Gauge Body The gauge body 3 is an arch-shaped member formed by combining the above-described gauge units 2 and 2. More specifically, the top plates 21 and 21 attached to the ends of the pair of gauges 2 and 2 are opposed to each other and abutted and connected. This allows the gauge body 3 to be located along the tunnel construction planned wall 5 as shown in FIG. Gauge body 3
Are arranged side by side at a predetermined pitch, and are integrally connected by a connecting member 4 described later. Note that the number of connected gauge bodies 3 can be changed as appropriate according to various conditions such as work conditions such as excavation work and spraying work and the scale of a tunnel to be constructed.

<D> Connecting Member The connecting member 4 is a member for connecting the plurality of gauge bodies 3 with each other. For example, a known tie rod or the like can be used. The connecting member 4 has, for example, an L-shaped end and is used by connecting the end to the sheath tube 23 attached to each of the gauges 2 and 2. By connecting the plurality of gauge bodies 3 and 3 with the connecting member 4, the gauge 1 for the tunnel unsupported section functions.

[0011]

Hereinafter, a method of using the gauge for a tunnel unsupported section according to the present invention will be described.

<A> Assembly process of gauge for unsupported section of tunnel A plurality of gauges are carried into a tunnel excavation site, and a pair of gauges are connected with the top plates facing each other to connect an arch-shaped gauge body. Assemble. The gauge body can be assembled and placed at the actual placement site in the tunnel tunnel. The assembled gauge main body forms an integral tunnel unsupported section gauge having a predetermined length in the tunnel excavation direction by bridging a connecting member between sheaths and pipes of the gauge unit as a constituent member. The total length of the tunnel unsupported section gauge assembled as described above is determined by the number of connected gauge bodies. The tunnel-unsupported section gauge can provide an optimum gauge by considering various conditions such as the scale of the tunnel to be constructed, the state of the surrounding ground, and the length of the unsupported section.

<B> Usage of Gauge for Unsupported Section of Tunnel Since the gauge for unsupported section of tunnel has an outer diameter along a wall to be constructed with a tunnel, when excavating a tunnel, a predetermined amount of concrete spraying is larger than the outer diameter. Excavation considering the thickness becomes possible. Also, the concrete can be sprayed on the tunnel excavation wall surface with uniform thickness by using the outer circumferential position of the gauge for the tunnel unsupported section as a guide. Furthermore, it is also possible to manage the completed form of the tunnel lining by using the gauge for the unsupported section of the tunnel.

[0014]

According to the present invention, as described above, the following effects can be obtained. <A> In the unsupported section of the tunnel, a guideline for tunnel excavation can be provided, so that an appropriate amount of excavation can be performed. <B> By performing the appropriate amount of extra excavation, the amount of concrete sprayed is also the appropriate amount, and cost reduction can be achieved. <C> Even if the wall thickness of the tunnel is controlled by the thickness of the sprayed concrete, the excavation shape is stable, so the work quality (work quality) is good. <D> By using the gauge of the present invention, it is not necessary to use a plotter system using a laser or a conventional steel support work as in the related art, and it is economical and no waste occurs in the drilling cycle.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a gauge for an unsupported section of a tunnel according to the present invention.

Claims (1)

[Claims] 1. A gauge having a dimension from the bottom to the top of a wall surface to be excavated, having a bottom plate and a top plate at its ends, and having a sheath tube in the axial direction of the tunnel. And a connecting member connected to a sheath tube of each of the individual gauges constituting the gauge main body, each of which has a single gauge constituting the gauge main body. A gauge for a tunnel-unsupported section, wherein a plurality of gauge bodies are positioned at predetermined intervals in a tunnel axial direction by connecting sheaths to each other by a connecting member.