JPH11166243A - Structure of underground tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress lift pressure by setting a ground restraint anchor and a floating prevention anchor toward a stratum right under a bottom plate and a deep stratum from the bottom plate respectively. SOLUTION: The short ground restraint anchor 4 of a steel wire is driven toward a stratum right under a bottom plate 1 and the stratum right under the bottom plate 1 and the bottom plate 1 are integrated. Next, the sufficiently long floating prevention anchor 5 of a steel wire is driven toward a deep stratum from the bottom plate 1 apart from the anchor 4. Therefore the bottom plate and the ground right under the bottom plate can integrated by a ground restraint anchor, the stress of lift pressure of underground water can be burdened even by the ground right under the bottom plate, the thickness of the bottom plate can be thinned, in addition, an amount of concrete of the bottom plate and reinforcing bars in reduced to reduce a cost, further the bottom plate and a side wall can be easily rigidly coupled, and as the result, execution such as joint cut of work, supporting work and joint displacement supporting work can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an underground tank.

[0002]

2. Description of the Related Art In many cases, a tank for storing low-temperature liquefied gas or the like is installed underground for the purpose of ensuring safety and an aesthetic landscape. Therefore, a lifting pressure due to groundwater acts on the bottom plate of the underground tank. Conventionally, in order to prevent the tank from being lifted by such a lifting pressure and to ensure the load capacity of the bottom plate against the lifting pressure, a method of increasing the weight of the underground tank and increasing the thickness of the bottom plate has been adopted. For this reason, a large amount of reinforcing steel placed in the bottom slab and thick concrete were required, which was uneconomical. As a structure to improve this point, a structure in which an anchor is installed from the bottom plate toward the ground has been developed.

[0003]

However, the structure of the underground tank described above has a structure in which the buoyancy is countered by the pull-out resistance of the anchor. This is merely a structure in which the weight of conventional concrete is simply replaced by pull-out resistance. Such ideas are often employed to prevent the falling of the retaining wall and the peeling of the legal framework, and cannot be said to have technical features.

The present invention has been made in order to solve the above-mentioned conventional problems, and provides a structure of an underground tank capable of distinguishing anchor groups by their functions and suppressing lifting pressure more efficiently. The purpose is to do.

[0005]

Means for Solving the Problems In order to achieve the above object, the structure of the underground tank of the present invention is directed to an underground tank in which a bottom plate is installed in the ground, from the bottom plate to the stratum immediately below the bottom plate. An underground tank structure is constructed by installing a ground restraint anchor that integrates the stratum just below the bottom slab 1 and the bottom slab, and further installing a floating prevention anchor from the bottom slab 1 toward the deeper stratum. It is what it was.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of an underground tank according to the present invention will be described below in detail with reference to the drawings.

<A> Position of the bottom plate. The tank of the present invention relates to an underground tank in which at least the bottom slab 1 is installed underground. A side wall 2 is provided around a bottom slab 1 of a tank, and a roof 3 is installed above the side wall 2. The tank can be widely used for all underground types and semi-underground types. An anchor is installed from the bottom slab 1 of the tank toward the ground. In the tank of the present invention, two types of anchors, namely, a ground restraint anchor 4 and a lifting prevention anchor 5 are used.

<B> Ground anchor 4 From the bottom slab, a ground restraint anchor 4 having a short steel wire length is cast toward the stratum immediately below the bottom slab. Since the ground restraint anchor 4 is an anchor for the purpose of integrating the stratum just below the bottom slab 1 and the bottom slab, it only needs to be delivered to the ground directly below the bottom slab, and an anchor using a short steel wire. Is enough.

<C> Lifting prevention anchor 5. From the bottom slab 1, separately from the ground restraint anchor 4, a lift prevention anchor 5 is cast toward a deeper formation. The lifting prevention anchor 5 is an anchor using a steel wire that is sufficiently longer than the ground restraint anchor 4. This lifting prevention anchor 5 is an anchor that performs the same function as a conventionally used anchor. However, the lifting prevention anchor 5 may be provided with the same function as the ground restraint anchor 4 described above, and the ground and the bottom slab 1 directly below the bottom slab 1 may be integrated with each other.

[0010]

As described above, the structure of the underground tank of the present invention is a structure in which two types of anchors are cast, and the following effects can be obtained. <B> Even if the lifting pressure of the groundwater acts, the ground restraint anchor 4 can integrate the bottom slab and the ground immediately below the bottom slab, and can also bear the stress on the ground below the bottom slab.
That is, the rigidity and strength of the bottom slab can be utilized. Therefore, as compared with the conventional structure that depends only on one type of anchor, when the total anchor length is the same, the stress generated in the bottom plate can be reduced and the thickness of the bottom plate 1 can be further reduced. As a result, the amount of concrete and rebar can be reduced, and an extremely economical structure can be adopted. <B> Compared to a structure using one type of anchor, if the total anchor length is the same, the bottom plate can be made thinner, so that it is easier to make the connection between the bottom plate and the side wall a rigid connection structure. become. As a result, joint stoppage works, bearing works,
In addition, a joint displacement buffer is not required, and an economical structure can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the structure of an underground tank according to the present invention.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Osamu Watanabe 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Katsushi Tsuda Inventor 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Yoshihiko Ikeuchi 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Masaki Umemoto 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation In company

Claims (1)

[Claims] Claims (1) In an underground tank having a bottom slab installed in the ground, a ground restraint anchor for integrating the formation immediately below the bottom slab and the bottom slab is installed from the bottom slab toward the formation immediately below the bottom slab. An underground tank structure with an anti-lift anchor installed at a deeper formation