JPH11280093A - Watertight structure of underground bedrock tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of delay in another operation giving no influence on installation of a tank by providing a water line supplying water to bedrock around an underground bedrock tank in the longitudinal direction of the tank, boring a hole from the ground. SOLUTION: A watertight structure A of an underground bedrock tank 1 comprises a plurality of holes 4 bored from the ground, and the hole 4 is composed of a curved portion extending from the ground to the vicinity of the tank 1 and a straight portion 4a along the longitudinal direction of the tank 1. The hole 4 is layed at the portion 4a extending along the longitudinal direction of the tank 1, and water is poured into the hole 4 from the ground and the tank 1 is made watertight. In this case, underground water pressure is controlled equal so that water can be supplied to the whole periphery of the tank 1. Accordingly, the hole 4 is bored from the ground and the watertight work is made possible along with the installation work of the tank 1, thereby reducing the work period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water seal structure of an underground rock tank for storing petroleum, liquefied natural gas (LPG) and the like in an underground rock.

[0002]

2. Description of the Related Art Underground rock tanks have been proposed as a method for storing petroleum and LPG. The underground rock tank is for excavating underground rock to form a cavity, and injecting oil and the like into the cavity to store the cavity. Compared with ordinary tanks built on the ground, this underground rock tank is superior in terms of safety and disaster prevention and environmental protection.Especially, since there is no problem of tank corrosion, there is no need for rust prevention measures, It has the advantage of requiring fewer security facilities and management personnel.

On the other hand, in an underground rock tank, it is necessary to maintain the underground water pressure around the tank higher than the hydraulic pressure of the petroleum or the like in order to prevent the stored oil or the like from penetrating into the ground from the cavity. Is called a water seal). For this reason, conventionally, a waterway is excavated along a tank, and water is supplied from the waterway to the underground around the tank as necessary to adjust the groundwater pressure. Such a conventional water seal structure will be described with reference to FIG.

The water seal structure 10 includes a water seal tunnel 11a and a water seal boring hole 11b which are water channels provided above an underground rock tank 12 extending in the horizontal direction. The water-seal tunnel 11a is provided along the longitudinal direction of the tank 12, from which a large number of water-seal boring holes 11b are provided radially in the horizontal direction. And water seal tunnel 11
When water is supplied to a, the water is evenly supplied to the bedrock above the tank 12 through the water seal boring hole 11b, and the underground water pressure is adjusted.

[0005]

In the construction of the water-sealed structure, the water-sealed tunnel is branched from the middle of the working tunnel, the water-sealed tunnel is excavated first, and then the water-sealed boring is driven from the excavated water-sealed tunnel. However, when branching off from the work tunnel and constructing a water seal tunnel, the waste generated by the construction of the water seal tunnel will be discharged through the work tunnel, which will be used for other work such as tank construction. This will cause a delay.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water sealing structure for an underground rock tank that has a very small effect on the construction of the tank and the like.

[0007]

According to the present invention, in order to obtain a predetermined underground water pressure, in a water seal structure provided with a water channel for supplying water to the rock around the underground rock tank, A water sealing structure for an underground rock tank is provided, which has a portion along a longitudinal direction of the tank and is a boring hole drilled from the ground (claim 1). In this means, the water channel for water sealing is not formed by branching from the work tunnel, but is separately drilled from the ground. Therefore, in the water seal structure of the present invention, the construction of the water channel and the construction of the tank and the like are completely different operations, so that the construction of the tank and the like is not delayed.

In this means, when water is supplied to the periphery of the tank, water is injected from the ground into the boring hole. However, since the boring hole has a portion extending along the longitudinal direction of the tank. In addition, water can be efficiently supplied to the entire bedrock around the tank even if the number of boring holes is small, and the groundwater pressure can be adjusted evenly. In the present invention, the boring hole can be formed by so-called control boring.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1A is a side view showing a water seal structure according to the present invention, and FIG. 1B is a cross-sectional view at an intermediate position. In FIG. 1, an underground rock tank 1 is provided extending in a substantially horizontal direction in a rock, and oil or the like is stored in the tank 1 through a shaft 3 through a plug 2 by a pipe, or , Payout is performed. The water seal structure A of the underground rock tank 1 has a plurality of boring holes 4 drilled from the ground.
Consists of The boring hole 4 is formed by drawing a smooth curve from the ground to the tank 1 by control boring, and is then drilled linearly in the longitudinal direction of the tank 1. That is, the boring hole 4 has a curved portion 4b from the ground to the vicinity of the tank 1 and the tank 1
And a linear portion 4a along the longitudinal direction of

As shown in FIG. 1B, a portion 4a of the boring hole 4 along the longitudinal direction of the tank 1 is located above the tank 1 (horizontal water seal) according to the purpose of the water seal. Or it is pierced to the side (vertical water seal: 4a '). Generally, a horizontal water seal refers to a water seal when a single liquid is stored, and a vertical water seal refers to a water seal for preventing a mixture of a plurality of different liquids when they are stored.

In the water seal structure A having such a configuration, the boring hole 4 as a water channel is drilled from the ground.
Construction can be performed in parallel with construction, etc., and the construction period can be shortened. The water sealing of the tank 1 is performed by pouring water into the boring hole 4 from the ground. Since the boring hole 4 has a portion 4a extending in the longitudinal direction of the tank 1, the number of the boring holes 4 is reduced. Water is supplied evenly over at least the entire periphery of the tank 1, and the underground water pressure is adjusted evenly.

[Brief description of the drawings]

FIG. 1 (a) is a side view showing a water seal structure according to the present invention. FIG. 2B is a cross-sectional view of an intermediate position in FIG. 1.

FIG. 2 is an external view of a conventional water seal structure 10.

[Explanation of symbols]

 A Water seal structure 1 Underground rock tank 2 Plug 4 Boring hole

Claims (1)

[Claims] 1. A water seal structure having a water channel for supplying water to the surrounding rock of an underground rock tank in order to obtain a predetermined groundwater pressure, wherein the water channel has a portion along a longitudinal direction of the tank. And a boring hole drilled from the ground.