JPH0533358A - Structure of underground storage tank and constructing method for same - Google Patents

Abstract

PURPOSE:To shorten the term of construction extremely, and reduce an execution cost. CONSTITUTION:On the constructing method of an underground storage tank with the bottom sections of side walls 1 with released upper and lower sections, which are closed with a bottom board 2, the thermal insulation panels 3 of vacuum thermal-insulation construction are embedded inside the side walls, and the side walls 1 are constructed. Then, a side-wall interior is filled up with water, and it is balanced with water pressure to be worked on the outer peripheral surfaces of the side walls and at the same time, excavation is performed and the side walls are set to be settled.

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 storage tank such as a heat storage tank having an inner wall provided with a heat insulating panel and a method of constructing an underground storage tank.

[0002]

2. Description of the Related Art From the viewpoint of effective use of limited resource energy, exhaust heat, solar heat, atmospheric heat, geothermal heat, etc. discharged from a building are collected and a heat storage tank is installed directly under the building or in the underground part near the building. A heat source supply system has been proposed in which heat is stored as a heat source and is utilized as a heat source for an urban facility, for example. This type of heat storage tank is constructed by constructing the body of the heat storage tank by a continuous underground wall construction method, etc., then dry excavating the inside, and finally attaching a heat insulating material to the inner wall of the body. .

[0003]

Problems to be Solved by the Invention The following problems have been pointed out in the technology for constructing the heat storage tank described above.

<A> The heat insulating material is attached in the final process after dry excavation. Therefore, attachment of the heat insulating material becomes complicated.

<B> Since the construction of the skeleton, the excavation process, and the heat insulating material mounting process are independent of each other, it takes a long time to complete.

<C> The wall constituting the heat storage tank is designed to have a thick wall pressure so as to withstand the earth pressure during dry excavation, which is one of the causes of an increase in construction cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide the following structure of an underground storage tank and a method of constructing an underground storage tank.

<B> Structure of underground storage tank and construction method of underground storage tank, which can significantly shorten the construction period.

<B> Structure of underground storage tank and construction method of underground storage tank capable of reducing construction cost.

<C> The structure of the underground storage tank and the construction method of the underground storage tank in which the wall thickness of the skeleton can be designed thin

[0011]

DISCLOSURE OF THE INVENTION The present invention relates to an underground storage tank in which a bottom slab closes the bottoms of side walls which are opened up and down, and a heat insulating panel having a vacuum heat insulation structure which is buried in a body forming the underground storage tank at the time of constructing the body. It is the structure of the underground storage tank, which is characterized by containing Furthermore, the present invention is characterized in that, in an underground storage tank in which the bottom part of the side wall which is opened up and down is closed by a bottom slab, the inner surface of the skeleton constituting the underground storage tank is covered with a heat insulating panel having a vacuum heat insulation structure attached at the time of constructing the skeleton. , The structure of the underground storage tank. Further, the present invention is a method of constructing an underground storage tank in which a bottom plate is closed at the bottom of the side wall which is opened up and down, in which a side wall is constructed by embedding a heat insulating panel having a vacuum heat insulating structure in the side wall and filling the inside of the side wall with water. It is a method of constructing an underground storage tank, which is characterized by excavating the sidewall while balancing it with the water pressure acting on the outer peripheral surface of the underground storage tank. Further, the present invention relates to a method for constructing an underground storage tank in which a bottom plate is closed at the bottom of the side wall that is open at the top and bottom, and while mounting a heat insulating panel having a vacuum heat insulating structure on the inner wall surface of the side wall, the inner ground of the side wall is excavated and the side wall is sunk. It is a method of constructing an underground storage tank, which is characterized in that

[0012]

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

<A> Structure of Underground Storage Tank FIG. 1 shows a sectional view of the blade portion of the lower underground storage tank. In the present invention, the heat insulating panel 3 is embedded in the body forming the side wall 1 and the bottom slab 2 of the underground storage tank. These heat insulation panels 3 are used when pouring concrete to construct an underground storage tank.
It is previously arranged in a formwork (not shown) in parallel with the inner wall and assembled, and then embedded by concrete pouring. The heat insulation panel 3 is not limited to a single layer as shown in the drawing, but may be embedded in multiple layers if necessary.

<B> Heat insulation panel The heat insulation panel 3 has a vacuum type thin plate hollow structure, and its outer shape is not limited. The heat insulating panel 3 will be described in detail with reference to FIG. 2. The heat insulating panel 3 is made of steel (for example, SA
S) and the like, and a box 31 having a sealed structure, and a urethane coating 32 covering the surface of the box 31. The heat insulating panels 3 are connected to each other by connecting pipes 34, and the heat insulating panels 3 in the side wall 1 and the bottom plate 2 are connected to each other by the exhaust pipe 33.
It is connected to the vacuum pump 4 on the ground via the, and the inside of the entire heat insulating panel 3 is evacuated by the operation of the vacuum pump 4.

[0015]

Next, a method of constructing an underground storage tank will be described with reference to FIGS. 3 to 5.

<A> Sidewall Sinking As shown in FIG. 3, an open type sidewall 2 is constructed by site casting at a scheduled construction position. At this time, embedding the plurality of heat insulation panels 3 in the side wall is as described above. Up to now, a method of constructing a wall body in advance and then performing dry excavation has been proposed, but in the present invention, the digging of the side wall 1 and the excavation work are performed in parallel. That is, the inside of the side wall 1 is excavated by filling the side wall 1 with water 5 (ground water, muddy water, or the like) and balancing the water pressure acting on the outer peripheral side of the side wall 1. As a result, the wall thickness of the side wall 1 can be designed to be thin considering only earth pressure.

<B> Construction of the bottom slab When the embedded side wall 1 of the heat insulation panel 3 is sunk to a predetermined depth as shown in FIG. 4, the bottom plate reinforced basket 6 is placed in the side wall 1 which is still filled with water 5. Drop it with a crane. A plurality of heat insulation panels 3 for the bottom plate and an exhaust pipe 33 are incorporated in the rebar cage 6 before subsidence. Then, underwater concrete is placed on the bottom of the side wall 1 using the tremie pipe 7 or the like to construct the bottom slab 2 in which the heat insulating panel 3 is embedded. Finally, as shown in FIG. 1, the exhaust pipes 31 and 31 are connected to the vacuum pump 4 to complete the construction. Thus, according to the present invention, the installation work of the heat insulation panel 3 is completed at the same time when the bottom slab concrete is poured. By operating the vacuum pump 4 to make the inside of the heat insulation panel 3 into a vacuum, a high heat insulation effect can be given to the underground storage tank.

[0018]

[Other Embodiments] FIG. 6 shows a case where the open side wall 1 is sunk by dry excavation in the absence of groundwater.
In the case of the present embodiment, when the side wall 1 is sunk in parallel with the dry excavation, the heat insulating panel 3 is sequentially installed from the lower part of the inner wall surface of the side wall 1 to the upper part. In addition, 9 in the drawing shows that the anchor 8 fixed in the ground before the construction of the side wall 1 is tensioned to the side wall 1.
It is a press-fit jack for sinking. Regarding the bottom slab 2, after the side wall 1 is sunk, a heat insulating panel is attached to the inner surface (top surface) of the bottom slab 2 constructed by pouring concrete. Further, as the heat insulation method of the bottom slab 2, a method of placing concrete after installing a reinforced basket for the bottom slab incorporating a heat insulation panel as in the above-described embodiment, or a method of placing foamed concrete with high heat insulation underwater is adopted. can do.

[0019]

Since the present invention is as described above, the following effects can be obtained.

<A> Since the heat insulation panel can be installed when constructing the structure of the underground storage tank, the construction period can be greatly shortened.

<B> Since the water pressures acting on the inside and outside of the side wall are balanced, the wall thickness of the side wall can be designed to be thin enough to withstand only earth pressure.

<C> The construction cost can be greatly reduced by the labor saving due to the shortening of the construction period and the material cost reduction due to the reduction in the thickness of the body.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment according to the present invention.

[Fig. 2] Partially enlarged view of the heat insulation panel

FIG. 3 is an explanatory view of a construction method when the side wall is sunk.

[Fig. 4] An explanatory view of a construction method at the time of installing the bottom-bar rebar cage

[Fig. 5] An explanatory view of a construction method during construction of the bottom slab

FIG. 6 is an explanatory diagram of another embodiment.

Claims (4)

[Claims] 1. An underground storage tank in which a bottom slab is closed at the bottom of the side wall which is open at the top and bottom, wherein a heat insulating panel having a vacuum heat insulation structure embedded at the time of constructing the structure is built in the body forming the underground storage tank. Underground storage tank structure. 2. An underground storage tank in which a bottom slab is closed at the bottom of the side wall that is open at the top and bottom, wherein the inner surface of the structure that constitutes the underground storage tank is covered with a heat insulation panel having a vacuum heat insulation structure installed when the structure is constructed. Yes, the structure of the underground storage tank. 3. A method for constructing an underground storage tank in which a bottom plate is closed at the bottom of the side wall which is opened up and down, in which a side wall is constructed by embedding a heat insulating panel of vacuum insulation structure in the side wall, and filling the inside of the side wall with water. A method of constructing an underground storage tank, characterized by excavating and sunk the side wall while balancing the water pressure acting on the outer peripheral surface of the side wall. 4. A method of constructing an underground storage tank in which a bottom plate is closed at the bottom of the side wall that is opened up and down, while mounting a heat insulation panel having a vacuum insulation structure on the inner wall surface of the side wall, and excavating the inner ground of the side wall to dig the side wall. A method of constructing an underground storage tank, characterized by: