JPH04368596A - Tunnel - Google Patents

Abstract

PURPOSE:To make back-filling work easy and to prevent an unbalanced load for a long term for elongating the life of a tunnel by filling many light granular bodies between the inside wall face of a gateway and a tunnel structure. CONSTITUTION:In a tunnel having a tunnel structure 14 formed in a gateway 10, many light granular bodies of foam stylene beads 18 or the like are filled in a gap 16 between the inside wall face of the gateway 10 and the outside wall face of the tunnel structure 14. The light granular bodies are preferably filled together with a binder to make the light granular bodies adhere mutually. Thus fillers can gather easily near the top of the tunnel structure 14 even in the gap 16.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tunnels, and more particularly to tunnels having a tunnel structure formed within a mine shaft.

0002

[Prior Art] In a tunnel in which a tunnel structure is formed with concrete or the like in a mine shaft, the tunnel structure is heavy, so even if it is formed using formwork, it is necessary to avoid descending near the top of the tunnel structure. I can't. Due to the lowering, a gap is generated between the inner wall surface of the tunnel and the outer wall surface of the tunnel structure. If voids occur in some areas, the pressure applied to the tunnel structure will not be constant (unbalanced load), and the parts of the tunnel structure where pressure is concentrated will deform or crack. ,
A method of filling the voids with cement milk, pea gravel, etc. (called backfilling) has been adopted.

0003

[Problems to be Solved by the Invention] However, the above-mentioned conventional method of filling the voids with mortar etc. has the following problems. Mortar, cement milk, pea gravel, etc. are heavy and difficult to transport and work with. Also,
The problem is that the filled mortar and the like is heavy and has fluidity, so it easily moves downward and is difficult to accumulate near the top of the tunnel structure where backfilling is particularly required. Accordingly, it is an object of the present invention to provide a tunnel in which the workability of backfilling work is good and the filling material easily accumulates near the top of the tunnel structure.

0004

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration. That is, in a tunnel formed by forming a tunnel structure in a mine shaft, a large number of lightweight granular materials such as foam are filled between the inner wall surface of the shaft and the outer wall surface of the tunnel structure. . In particular, the lightweight granules may be filled together with a binder for fixing the lightweight granules to each other.

[0005]

[Action] The action will be explained. Since lightweight granular materials such as foam are filled as filler between the inner wall of the tunnel shaft and the outer wall of the tunnel structure, transporting the filler and backfilling work are easier than using heavy fillers such as mortar. It becomes easier to remove. Furthermore, since lightweight granules such as foam are used as fillers, they tend to accumulate near the top of the tunnel structure even within the voids.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, the configuration will be explained. 10
is a mine shaft, and is formed by digging out the ground 12. Reference numeral 14 denotes a tunnel structure, which is formed within the tunnel 10 to have an arch-shaped cross section. The tunnel structure 14 is made of concrete. Vehicles and the like can pass through the inside of this tunnel structure 14. A gap 16 is formed between the outer wall surface of the tunnel structure 14 and the inner wall surface of the shaft 10, as explained in the section of "Prior Art". This void 1
6, as described above, an unbalanced load acts on the tunnel structure 14, shortening the life of the tunnel structure 14. Therefore, in this embodiment, styrofoam beads, which are an example of lightweight granular material, are used as a filler in the void 16.
Fill 8. This filling method will be explained.

A through hole 20 for filling with a filler material is bored near the top of the tunnel structure 14. Styrofoam beads preformed into granules for filling operations 1
A vehicle 24 loaded with a tank 22 containing 8 etc. is driven to the site (not limited to vehicle transportation, a plant for producing Styrofoam beads 18 may be constructed near the site). When the vehicle 24 arrives at the site, the tip 28 of the hose 26 connected to the tank 22 is inserted into the through hole 20 of the tunnel structure 14 and fixed by an appropriate method. hose 26
When the setting is completed, a pump (not shown) is driven to pump the foamed polystyrene beads 18 from the tank 22 into the cavity 16. The beads 18 are mixed with a coagulable binder (not shown) such as an adhesive to fix the beads 18 to each other in the tank 22, and the binder is pumped into the cavity 16 together with countless beads 18. The large number of beads 18 and binder pumped into the gap 16 gradually fill the space inside the gap 16. If lightweight granules are used to fill the voids 16 as in this embodiment, they are lightweight (specific gravity of about 0.1) and are much easier to pump than conventional mortar, granular gravel, etc. Furthermore, even if the material is pumped, the volume shrinkage is small, so it will not become difficult to pump or the pumping efficiency will decrease. Styrofoam is water resistant and can form a waterproof layer, which also helps prevent frost damage to the tunnel structure 14. Furthermore, when the void 16 is filled with the air, it becomes possible to prevent an uneven load on the tunnel structure 14.

When the cavity 16 is sufficiently filled with beads 18 and binder, the distal end 28 of the hose 26 is pulled out from the through hole 20, and the through hole 20 is closed by an appropriate means (not shown). As time passes, the binder dries and the beads 18 within the voids 16 become fixed and do not move within the voids 16. In the above embodiment, Styrofoam beads 18 were used as an example of the lightweight granular material, but the lightweight granular material is lightweight, has airtight and watertight properties, and also has heat insulation properties, chemical resistance, self-extinguishing properties, etc. Granules are preferred. However, taking into account the structure of the tunnel, the environment of the ground 12, etc., it may be possible to ignore air/water tightness, heat insulation, chemical resistance, water resistance, self-extinguishing property, etc. Therefore, as the lightweight granules, in addition to foamed polystyrene, granules of foamed urethane, foamed polyethylene, foamed vinyl chloride, perlite, etc. can be employed. Further, the lightweight granules do not need to be formed into granules in advance, and may be self-foamed after being fed into the voids 16 to form the lightweight granules. that's all,
Although various preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments. For example, if there is no risk of the lightweight granules moving within the voids 16, the binder may not necessarily be provided. Of course, many other modifications may be made without departing from the spirit of the invention.

[0009]

Effects of the Invention In the tunnel according to the present invention, lightweight granules such as foam are filled as a filler between the inner wall surface of the tunnel shaft and the outer wall surface of the tunnel structure.
Compared to heavy fillers such as mortar, it is easier to transport and backfill the filler. In addition, since lightweight granules such as foam are used as fillers, they tend to accumulate near the top of the tunnel structure even within the voids, making it possible to prevent unbalanced loads over a long period of time, extending the life of the tunnel. It is possible. Particularly, when the structure of claim 2 is adopted, it is possible to achieve remarkable effects such as being able to reliably fix the lightweight granular material near the top of the tunnel structure.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a tunnel according to the present invention.

[Explanation of symbols]

10 Mine shaft 12. Grounds 14 Tunnel structure 16 Voids 18 Styrofoam beads 20 Through hole 22 Tank 24 Vehicle 26 Hose 28 Tip

Claims (2)

[Claims] Claim 1: In a tunnel formed by forming a tunnel structure in a mine shaft, a large number of lightweight granular materials such as foam are filled between the inner wall surface of the shaft and the outer wall surface of the tunnel structure. Features a tunnel. 2. The tunnel according to claim 1, wherein the lightweight granules are filled with a binder for fixing the lightweight granules to each other.