JPS5929760B2 - How to excavate underground storage cavities - Google Patents

Description

Detailed Description of the Invention The present invention relates to a method of excavating a storage cavity underground for the purpose of stockpiling or disposing of resources such as petroleum. At a high level, excavate an upper tunnel that extends perpendicularly to the cavity and opens to the outside at both ends of the tunnel, and excavate an inclined tunnel from both ends of the tunnel.
A lower tunnel is excavated parallel to the upper tunnel at the bottom level of the cavity by connecting to the inclined tunnel, and then branch tunnels are dug out from the lower tunnel at each required position, and the tip of the branch tunnel has the required cross section. The feature is to excavate an underground storage cavity, and then connect the same cavity to the upper tunnel through a shaft, and the purpose is to improve the underground storage cavity with excellent construction efficiency and high economic efficiency. The point is that it provides an advanced excavation method.

The present invention will be described below with reference to the illustrated embodiments.

First, in the required ground A, an upper tunnel 1 is excavated at a level higher than the underground storage cavity to be excavated in the same ground, and opens to the outside at both end shaft openings 1a and lb extending perpendicularly to the cavity. Excavate inclined tunnels 3 and 3' from both ends,
A lower shaft 2 is excavated at the bottom level of the cavity parallel to the upper shaft 1 so as to be connected to the upper shaft 1, 2 and the lower shaft 3, 3'. Configure a working space surrounding an underground storage cavity. The inclined tunnels 3 and 3' constitute a working tunnel together with the lower tunnel 2, and are sloped to such an extent that vehicles can freely enter and exit. A ventilation system is provided at the entrance of the tunnel, or in a shaft or side shaft specially provided from the inclined tunnels 3, 3', to improve ventilation of the working tunnel. Next, a branch tunnel 4 is dug at each predetermined position of the lower tunnel 2, and underground storage cavities B1, B2, B3, and B4 are formed at the tips of the tunnels by a known construction method.
. . . are excavated one after another, and after the excavation of each cavity is completed, the upper tunnel 1 and the shaft 5 are connected to each other.

The shaft 5 will be used for ventilation or for carrying in and out of stored materials in the future. In the figure, 6 is a shaft connecting the upper tunnel 1 and the surface of the ground A, which will be used for ventilation such as removing paper in the future.

When excavating the underground storage cavity, the lower tunnel 2 and the inclined tunnels 3 and 3' are used as working tunnels, and the excavation of the cavity is carried out from the hollow by the branch tunnel 4, the lower tunnel 2, and one side. The process is carried out by transporting the boron from one entrance 1a of the upper shaft 1 through the inclined shaft 3, and from the other shaft 1b through the upper shaft 1, the inclined shaft 3' and the lower shaft 2, to the branch shaft 4. An empty transport vehicle is brought into the cavity, and the removal work is carried out through circulation work.

The underground storage cavities are the first cavity B1 and the second cavity B.
2, the third cavity B3, etc., and when the excavation of the first cavity B1 is completed, the branch shaft 4 dug from the lower shaft 2 is closed and sealed with a concrete wall. Then, a device for transporting stored materials is attached to the shaft 5 that communicates with the upper tunnel 1, and the first cavity B1 is connected to the outside of the mine via the shaft 5 and the upper tunnel 1, and the first cavity B1 is connected to the first cavity B1. The storage operation will begin.
In this way, even if the storage work for the first cavity B1 is started, the underground storage cavity is excavated in a position that does not affect the ground A, and thus, even while other cavities are being excavated, the already completed cavity can be used for storage. The underground storage cavities will be completed one by one as the project progresses. Furthermore, if it becomes necessary to increase the storage capacity after the excavation work of the underground storage cavity is completed using this method, the upper and lower tunnels 1 and 2 are extended to the left and right.
The intended purpose can be achieved by digging a branch tunnel 4 from the lower tunnel 2 and excavating a cavity.

The above method is applicable not only to good ground above the groundwater level but also to poor ground, and cavities may be covered with shoring, rock bolts, poured concrete, lining, etc., depending on the ground condition. It is. Further, it is necessary that the distance between the cavities be at least 3 to 5 times the excavation width of the cavities. Furthermore, when excavating an underground storage cavity regardless of the groundwater level,... To prevent stored materials from flowing into ground A,
The covered structure is designed to prevent this with special joint plates, oil stop plates, steel plate lining, etc.

The underground storage cavity is designed to be stable and have a cross-sectional shape that is as large as possible depending on the ground conditions at the excavation site. This is an example.

In the present invention, as described above, an upper tunnel is excavated at a level higher than the underground storage cavity to be excavated underground, extends in a direction perpendicular to the cavity, and opens to the outside at both ends of the tunnel. Excavating a diagonal tunnel, connecting it to the diagonal tunnel, and excavating a lower tunnel parallel to the upper tunnel at the bottom level of the cavity to create a three-dimensional work area surrounded by each of the diagonal tunnels and the upper and lower tunnels. Then, branch tunnels are branched out from the lower tunnel at each required location, and underground storage cavities of the required cross section are excavated at the tips of the tunnels, and underground storage cavities are installed in parallel within the three-dimensional work area. Since the cavity is connected to the upper tunnel via a shaft to communicate with the outside of the mine, the excavation chamber of the cavity is sequentially connected from the branch tunnel to the lower shaft, one of the inclined shafts, the upper shaft, and one of them. On the other hand, an empty working vehicle is carried into the cavity from the other entrance of the upper shaft through the upper shaft, the other inclined shaft, the lower shaft, and a branch shaft, and thus the To significantly improve construction efficiency by performing surfacing work during cavity excavation in a circular manner.

At this time, by appropriately selecting the slope of the inclined tunnel, the work vehicle can proceed smoothly and efficiency can be further improved.

Furthermore, in the present invention, since a shaft is connected between the underground storage cavity excavated as described above and the upper tunnel, the storage material can be moved in and out of the cavity using the shaft and the Dobe tunnel. It will be carried out smoothly.

Further, according to the method of the present invention, by sealing the branch shaft of the underground storage cavity excavated as described above, other underground storage cavities can be excavated while the same cavity is used for storage. It is economically advantageous.

Furthermore, the present invention is applied to the construction of underground oil storage fields, underground water storage fields, etc., and is effective when a large number of underground storage cavities are excavated in parallel.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a slope view of an underground storage cavity and a mine shaft constructed by the method of the present invention, Fig. 2 is a vertical cross-sectional view thereof, and Figs. 3 and 4 are partially cut-out slopes of the cavity portion, respectively. It is a diagram. 1... Upper tunnel, 2... Lower tunnel, 3
...Diagonal tunnel, 4... Branch tunnel, 5...
...shaft, A...ground, Bl, B2,
B3, B4...Cavity for underground storage.

Claims (1)

[Claims] 1. Excavate an upper tunnel at a level higher than the underground storage cavity to be excavated underground, extending perpendicularly to the cavity and opening to the outside at both ends of the tunnel, and excavating a diagonal tunnel from both ends of the tunnel. A lower shaft is connected to the tunnel and excavated parallel to the upper shaft at the bottom level of the cavity, and then branch shafts are dug out from the lower shaft at each required position, and an underground tunnel of the required cross section is drilled at the tip of the branch shaft. A method for excavating an underground storage cavity, comprising excavating a storage cavity and then connecting the cavity to the upper tunnel via a shaft.