JPS58146798A - Underground tank for storing low temperature liquefied gas and execution thereof - Google Patents

Abstract

PURPOSE:To prevent positively a tank from intrusion of underground water while the tank is not used by embedding a piping network in which low temperature heat exchanging liquid is circulated into a continuous underground wall. CONSTITUTION:A piping network 14 in which low temperature heat exchanging liquid is circulated is embedded in a continous underground wall 10 constituting a underground tank. Before low temperature substance like LNG is stored or when the tank is idly free from liquid for a long time heat exchanging medium for freezing like liquefied nitrogen is circulated in the piping network 14. Thus, underground water tending to intrude into the interior of the tank through concrete placing joints or the like of the continuous underground wall 10 is fixedly frozen by the heat exchanging liquid for freezing circulated in the piping network 14 so that the intrusion of underground water into the interior of the tank can be positively blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground tank for storing low temperature intensified gas using an underground tank and a method for constructing the same.

In recent years, fully underground or semi-underground tanks have come into use for storing low-temperature materials such as LNG, and these underground tanks are constructed using continuous underground walls. The construction method is to first install a continuous underground wall with stones at a position corresponding to the outside of the tank, and then use the reverse winding method, to or forward winding method to surround the dead wall with the underground wall. Tank body T-Construction to construct a fully underground or semi-underground tank.

By the way, in the conventional underground tank for storing low-temperature liquefied gas as described above, there is no problem when low-temperature substances such as LNG are stored there, but there is no problem when low-temperature substances such as LNG are stored there. If the storage tank is left in a storage tank for an inconvenient period, a problem arises in that groundwater infiltrates through the concrete joints in the tank wall.This intrusion of groundwater is caused by groundwater pressure. This can be prevented by injecting grout into the joints of the concrete.In addition to this, it is necessary for this type of underground tank to have a sufficiently thick wall. Temperature stress caused by the hardening heat of poured concrete can cause cracks that can cause water intrusion, and the temperature is 4%.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to prevent underground water from being stored in tanks between completion and use, or during temporary inconvenience. To provide an underground tank for storing friendly low temperature decomposed gas which can reliably prevent the intrusion into the interior of the tank. In addition, it is possible to relatively easily and reliably prevent the intrusion of groundwater during construction, and also to prevent the occurrence of cracks caused by the heat of hardening of poured concrete. The purpose is to provide a construction method for storage tanks below ponds.

Hereinafter, a preferred example of a dormitory S according to the present invention will be explained based on the drawings.

In each figure, common or corresponding parts KF'i are indicated using the same reference numerals.

FIGS. 1 and 2 show one row of tanks for storing low-temperature raw gas according to the present invention. The underground tank shown in the same window is constructed using a continuous underground tank 11to. The basic structure is the same as the conventional one described above, but in this invention, a pipe @ 14 through which a low-temperature heat exchange liquid circulates is buried in the continuous underground wall 10. It will be a temporary opportunity.

In this actual project 1IIAIP1, the piping network 14 is buried so as to have a uniform piping density when constructing the continuous underground wall 10. Inside the continuous wall 10, I1 bodies [2 and [1116
is provided.

Now, in the underground tank configured as above, there is a
L) Before storing low-temperature substances such as IG or when the tank is empty during the machine and is in a stationary state, 1 above piping #11
4 through the vibrator 14& liquid 'i1''a or LN
Circulate a freezing heat exchange medium such as G. This is from K, 4
Groundwater that attempts to enter the tank through the concrete pouring joints etc. of the continuous underground wax 10 will flow into the piping network 14.
It is frozen and fixed by the 5I condensing heat exchange liquid that is subjected to N, and the intrusion of groundwater into the tank is reliably prevented.

In order to construct the above-mentioned underground tank, when constructing the continuous underground wall 10, it is sufficient to install the piping @ 14 through which the low-temperature heat exchange liquid circulates in advance and bury it in the poured concrete. Then, before the underground 610 is completed, a cooling heat exchange liquid such as water is circulated through the piping network 14 to absorb the hardening heat of the poured concrete. This prevents the occurrence of cracks, etc. that may cause water ingress due to Kll & stress inside the concrete. What is even more noteworthy is that after the completion of the above-mentioned K-10,
By circulating the freezing fluid through the piping network 14,
For example, by making the underground water infiltrated along concrete pouring joints, etc., it becomes frozen and acts as a sealing material, which greatly improves the water-stopping effect of underground 210. It is something that can be enhanced.

After all the construction has been completed, the underground pipe network 14 will be used to prevent underground water infiltration and heat fence before storing the low-temperature qualities or for long-term viewing. can do.

8 and 4 show another embodiment of the present invention, in which +sft the continuous underground 610 itself constitutes the entire wall 12 of the underground tank.

If a piping network 14 through which a low-temperature heat exchange liquid circulates is previously buried inside the underground chamber, the same effect as that of the above-mentioned embodiment can be obtained. I can do it.

9, like the pond moth shown in Figures 6 and 61,
The piping network 14 has a stone 1
In the case where the IJk of the IJk body 12 is large, the concrete curing heat can be absorbed more effectively during the first construction.

As described above, the present invention has the following advantages: First, as an underground tank for storing low-temperature liquefied waste, it is relatively easy to prevent underground water from entering the tank when it is empty due to storage of low-temperature 1-quality IEI11f6 or long-term inconvenience. The method of construction is such that the water-stopping effect during construction can be easily and reliably prevented, and the occurrence of cracks caused by concrete curing heat can also be prevented. . However, the piping network used at the time of construction can be used as is for the purpose of preventing flooding and as a heat fence in the underground tank after completion.

[Brief explanation of drawings]

11 Figure 1 is a vertical WIr sectional view showing one layer of 1m11F of an underground tank for storing low-temperature liquefied gas based on this invention; 4 is a cross-sectional view thereof, FIG. 6 is a vertical cross-sectional view showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view thereof. lO...... Compliant underground wax [2... Tank wall body 14...... Low black heat exchange liquid ring piping network 14
Turtle... Vibrator 16... Tank! Ell [Patent applicant: Obayashi Co., Ltd. Tsujin 9P Shioji - Kensuke Iro

Claims (2)

[Claims] (1) In an underground tank for storing 9 low-temperature sonic gas using a continuous underground structure, a low-temperature heat exchange liquid of 111
An underground tank for storing low-temperature liquefied gas characterized by a buried piping network that circulates the gas. (2) In the method of constructing an underground tank for storing nine low-temperature sonic gases using a continuous underground wall, a piping network through which the low-temperature heat exchange liquid circulates is laid in advance and poured during capping of the above-mentioned one continuous underground wall. It is buried in concrete, and before the underground wall is completed, a cooling heat exchange liquid is circulated to absorb the hardening heat of the poured concrete. Let me abuse &[
A construction method for an underground tank for storing low-temperature liquefied gas, which involves making an underground wall a[#], thereby increasing the water-stopping effect of the underground wall.