JPH04113100A - Draining method and structure for construction of double grain storage tank - Google Patents

Abstract

PURPOSE:To easily and efficiently drain rainwater by providing a drain hole from a bottom plate to a storage tank outer part at the time of constructing the bottom plate of a concrete outer tank, and charging and fill a filler such as concrete mortar in the drain hole after constructing the outer tank roof. CONSTITUTION:A drain pipe 6 is provided in a place where the foundation and bottom plate of a concrete outer tank is in contact with the ground. A drain hole 1 is formed by burying the drain pipe 6 at the time of constructing the footing part 5 of the connecting corner part between the bottom plate 3 and side wall 4 of the concrete outer tank on the foundation 2 of the storage tank. The rainwater fallen during the constructing period is naturally drained through the drain hole 1, and discharged out of the storage tank. After the outer tank roof is constructed, the drain hole 1 is airtightly clogged and buried by press-fitting concrete mortar into the drain pipe 6. Consequently, the rainwater is efficiently drained out of the storage tank by the natural flow, dispensing with a drain facility and draining work at the time of raining and draining.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention prevents rainwater from accumulating inside the concrete outer tank during the installation of a double-shelled low-temperature storage tank consisting of a concrete outer tank and a metal inner tank. This invention relates to a method and structure for draining rainwater to the outside of a concrete outer tank.

(Problems to be solved by the prior art and the invention) A double-shell type low-1 storage tank whose outer tank is made of concrete and whose inner tank stores low-temperature liquid F-1 gas is constructed by covering the periphery of the concrete slab on the pile with earth mounds or crushed stones. A bottom slab, which will become the bottom of the concrete outer tank, is constructed on a hardened so-called solid slab foundation, or a so-called raised foundation, in which concrete slabs are placed on anchor piles at predetermined intervals from the ground, and then the bottom slab and the outer tank are constructed. A footing at the connecting corner of the lower part of the side wall is constructed, and then the side walls are built up one after another from the bottom to the top on the footing.

Before piling up the concrete outer tank side wall, the bottom comfretolith M directly below the inner tank side plate that accommodates the storage liquid, the outer peripheral edge of the inner tank bottom plate, and the lowest inner tank side plate are constructed, and the outer tank side wall is In parallel with the stacking, the inner tank side plates are also stacked up, and the inner tank roof and outer tank roof are assembled on the inner tank side plates and outer tank side walls.Then, the bottom cold insulation layer and the side cold storage tank between the inner and outer tanks are assembled. , the bottom plate of the inner tank is generally constructed.

In other words, as mentioned above, the roof of the outer tank is usually constructed last, so after the bottom slab and side walls of the concrete outer tank are constructed, the construction period can last several months until the roof of the outer tank is completed. During this period, rainwater entered the concrete outer tank and accumulated.

It took a lot of effort and difficulty to remove this rainwater.

In other words, draining rainwater required a high-pressure drainage pump that could overcome the high concrete side walls, a long hose, and a TS cord.

In addition, it was necessary to provide sufficient drainage to prevent the cold insulation layer from being submerged or saturated with accumulated rainwater, and to take measures to prevent drainage and monitor systems even at night.

This invention was made in order to solve the problems of the prior art described above.The purpose of this invention is to provide continuous construction after the bottom and sides of the concrete outer tank are constructed until the roof is constructed. To prevent rainwater from accumulating inside a concrete outer tank by simply and efficiently discharging rainwater during a period of time.

(Means for Solving the Problems) The drainage method for constructing a double shell storage tank according to the present invention includes a drain drain for draining rainwater from inside the outer tank when pouring the bottom slab of the concrete outer tank. It is embedded from the bottom slab toward the outside of the storage tank, and after construction of the outer tank roof, the drain hole is filled with filling made of a strength material such as concrete mortar that hardens after filling, and is completely integrated with the bottom slab. .

In addition, a drain for draining rainwater in the concrete outer tank to the outside of the storage tank is provided by providing a communication part at the bottom of the bottom ring concrete that supports the inner tank side plate, and connecting the outer peripheral bottom plate outside the bottom ring concrete.

Alternatively, a drainage pipe is provided to the outside of the storage tank on one of the lower bottom plates of the inner central part to provide a drainage structure when constructing a double shell storage tank.

(Function) According to the drainage method according to the present invention, rainwater that falls in the outer tank during the construction period until the roof of the outer tank is constructed is naturally drained outside the storage tank through a drain provided in the concrete outer tank bottom plate. Since there is no stagnation of 9wI water, which can be efficiently and easily discharged, it will not become an obstacle when constructing the cold insulation layer on the inner bottom slab of the concrete outer tank or the inner tank, nor will it cause difficulties in the work of removing rainwater. .

In addition, a communication part is provided at the bottom of the bottom ring concrete that supports the inner tank side plate, and the storage tank is connected to the lower bottom plate of either the outer peripheral bottom plate area or the central bottom plate area separated by the bottom ring concrete. In a drain with a drain pipe to the outside, rainwater passes through the communication part, collects at the drain, and flows out to the outside of the storage tank.

Therefore, the side cold insulating layers provided in the outer peripheral bottom plate area and the bottom cold insulating layer provided in the central bottom plate area do not become hydrated or submerged by rainwater, thereby preventing adverse effects on the cold insulating material.

In addition, the drain provided from the concrete outer tank bottom slab to the outside of the storage tank should be filled with concrete mortar or other strength material that hardens after the outer tank roof is repaired, that is, when there is no longer any risk of rainwater intrusion. ,! ! ! Since it is firmly and airtightly integrated with the outer tank bottom plate, the outer tank of the double-shell storage tank has no problems in terms of strength and function.

(Example) This invention will be explained in detail based on drawings of embodiments.

FIG. 1 shows a first embodiment of the drainage method according to the present invention.
It is an explanatory side cross-sectional view of the storage tank with a part removed showing a drainage structure in which a drain pipe is provided where the foundation and bottom slab of the comfort outer tank are in contact with the ground, that is, where the bottom slab and solid slab foundation are integrated. Further, FIG. 3 is a side cross-sectional explanatory view showing the state of the drain pipe of the first embodiment shown in FIG. 1 after completion of the storage tank filled with filler.

The drain 1 is formed by embedding a drain pipe 6 with a water flow slope on the foundation 2 of the storage tank when constructing the footing 5 of a part of the connecting corner of the bottom plate 3 and side wall 4 of the concrete outer tank. . The tip of the drain pipe 6 inside the concrete outer tank opens an outer peripheral drain port 12 on the surface of the outer peripheral bottom plate between the bottom ring concrete 8 supporting the inner tank side plate 7 and the outer tank side M4, and the bottom ring A central drainage port 13 is opened and formed on the surface of the central bottom slab inside the concrete 8.

One or a plurality of the outer circumferential drainage ports 12 and the central drainage ports 13, that is, the number necessary for drainage, are provided at appropriate low locations with a bowed slope so that rainwater can easily collect. The drain pipe 6 extending from the drain port extends outward from the side edge of the foundation 2 of the storage tank, either singly or by connecting a plurality of pipes along the way, and reaches the drain outlet 14.

Rainwater that falls during the construction period will flow naturally through drain 1, be efficiently collected, and discharged to the outside of the storage tank.

FIG. 2 shows a second embodiment of the drainage method according to the present invention.
A side cross-sectional explanatory diagram of a storage tank with a portion removed showing the drainage structure when the drainage pipe is installed on a raised foundation with the foundation and concrete bottom slab of the storage tank installed on anchor piles at a predetermined distance from the ground. It is.

The foundation 2 of the storage tank and the bottom slab 3 of the concrete outer tank are connected to a plurality of reinforced concrete piles 15 buried in the ground, and are formed in a so-called raised-floor type with a predetermined distance from the ground surface.

The drain 1 is formed by embedding a drain pipe 6 when the foundation 2, the bottom plate 3, and the footing part 5 are installed. The drain pipe 6
is an outer peripheral drainage port 12 opened in the outer peripheral bottom plate separated by the bottom ring concrete 8 that supports the inner tank side plate 7.
, and a central drainage port 13 opened in the inner central bottom plate, and are buried downward from each other, and the tip reaches a drainage exit 14 on the lower surface of the foundation 2 formed at a predetermined distance from the ground surface.

One or more drain drains 1 are provided at suitable locations where rainwater tends to collect so that rainwater falling in the concrete outer tank can be efficiently drained.

Figures 4A and 4B show a third embodiment of the drainage structure of the present invention, in which a communication part 16 is provided at the bottom of the bottom ring concrete, and the drain 1 is placed either near the center or near the outer periphery of the bottom slab. The case where an opening is provided is shown.

In the drain 1 shown in FIG. 4A, rainwater that falls on the outer circumferential side of the bottom ring concrete 8 passes through the communication part 16 and collects at the center of the bottom plate, and the rainwater that falls on the center is drained from the center drainage port 13A into a storage tank. Shows the structure that is discharged to the outside.

In the drain 1 shown in FIG. 4B, rainwater that has fallen on the inside of the bottom ring concrete 8 passes through the communication part 16 and collects on the outer periphery of the bottom plate, and together with the rainwater that has fallen on the outer periphery, the outer periphery drainage port 1
2A shows a structure in which water is discharged to the outside of the storage tank.

FIG. 5 is an explanatory longitudinal cross-sectional view of the communication portion shown in FIGS. 4A and 4B.

The communication part 16 provided at the bottom of the bottom ring concrete 8 is 1
For example, a half circular pipe 16A, an angle material 16B, a channel material 160, etc. are buried face down.

The hollow interior is formed to allow water to pass through.

In addition, the communication part 16 can also be used by inserting electric wire cords, cables, hoses, etc. necessary for the work. As in the case of draining, the drain may be firmly and airtightly filled with a filling made of a strength material such as concrete mortar that hardens after filling.

In addition, the drain 1 shown in the first, second, and third embodiments is installed from the drain outlet 14 on the outside of the storage tank after the outer tank roof is constructed and rainwater no longer intrudes. Press concrete mortar, etc. into the inside of the drain pipe 6, make sure that the filling such as concrete mortar overflows from the outer peripheral drain port 12 and the central drain port 13, and fill it by forming an airtight seal (Fig. 3). reference).

In addition, the outer circumferential drain port 12 of the drain outlet 1, which is provided toward the outside from the outer circumferential bottom plate between the bottom ring concrete 8 supporting the inner tank side plate 7 and the concrete outer tank side wall 4, is filled with a filler to be filled inside. Instead of the above-mentioned filling made of a strength material that hardens over time, such as concrete mortar,
A removable filler such as continuous glass wool with excellent insulation properties is selected, and the filler in the drain port 12 on the outer periphery of the drain outlet 1 is extracted during repair and inspection work after construction of the double shell storage tank. r: f&, the outer peripheral drain port 12
It may also have a structure in which a T41 cord, cable, hose, etc. necessary for work can be inserted. (Effects) The drainage method and structure of a double shell storage tank according to the present invention provides the following effects.

Rainwater that falls during the long construction period until the roof of the outer tank is constructed is efficiently drained out of the storage tank by natural flow without collecting on the bottom slab inside the concrete outer tank, and a drainage pump is used during rain or drainage. , drainage equipment such as hoses and power sources, and drainage work and monitoring become unnecessary.

A drain can be installed in a project site by embedding a drain pipe when the foundation and bottom slab of the storage tank are laid.Drainage pipes prevent rainwater from accumulating in the outer tank and submerging the cold insulation layer when it becomes hydrated. It does not damage the function of cold insulation materials that dislike moisture.

In addition, a communication part is provided at the bottom of the bottom ring concrete, and a drain that is not connected to the outside of the storage tank can be drained from the lower bottom of either the outer peripheral bottom slab area or the central bottom slab area separated by the bottom ring concrete. If you set
Rainwater passes through the communication part and is collected in the lower drain and drained outside the tank. The number of drains passing through the bottom slab and foundation is minimal.

In particular, in a structure with a communication section, if the drain is installed near the outside of the bottom plate, it will not affect the strength or functionality of the center bottom plate at all, and will allow the water accumulated in the center bottom plate to be communicated. The water can be collected near the outer periphery of the bottom plate through the tank, allowing for effective drainage to the outside of the storage tank.

In addition, the communication part can also be used by inserting wire cords, cables, hoses, etc. into the communication part without having to go over the inner NO@ board.

In addition, after the outer tank roof has been constructed and rainwater has stopped penetrating, the drainage and communication areas can be filled with concrete mortar or other strength materials that harden after filling, and can easily be made into an integrated foundation or bottom slab. be able to.

In addition, since the filling and solidifying section is strong and airtight, the foundation and bottom plate will not pose any problems in terms of strength or functionality when using the storage tank.

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the drainage method according to the present invention.
FIG. 2 is a side cross-sectional explanatory view of a storage tank with a part removed when a drainage structure is provided on a solid slab foundation, and is a second embodiment of the drainage method according to the present invention, in which a drainage structure is provided on a raised foundation. Figure 3 is a side cross-sectional explanatory diagram of the storage tank with a part removed.
FIG. 1 is a side sectional explanatory view with a part of the entire storage tank removed showing the state after the drain pipe is filled with filler, and FIGS. 4A and B are a third embodiment of the drainage structure according to the present invention. As an example, Fig. 5 is a side cross-sectional explanatory view with a part of the lower part of the storage tank removed, showing a state in which a communication part is provided at the bottom of the bottom ring concrete and a drainage port is provided near the center or near the outer periphery of the bottom slab. Figure 4A,
FIG. 6 is an explanatory longitudinal cross-sectional view of the communication portion shown in FIG. Drain drain 2... Base boric acid plate 4... - Side wall drain pipe
7... Inner tank side plate bottom ring concrete 16A, 16B, 16C... Communication section 1... 3... 6...

Claims (2)

[Claims] (1) When constructing a double shell type storage tank consisting of a concrete outer tank and a metal inner tank, when constructing the bottom slab of the concrete outer tank, the drain drain for draining rainwater from inside the outer tank during the construction period should be installed as described above. A double shell storage tank, which is provided from the bottom plate toward the outside of the storage tank, and is characterized in that after constructing an outer tank roof that prevents rainwater from entering, the drain hole is filled with a filler made of a strength material such as concrete mortar that solidifies after filling. Drainage methods during construction. (2) To drain the rainwater in the concrete outer tank to the outside, a communication part is provided at the bottom of the bottom ring concrete that supports the inner tank side plate, and the outer peripheral bottom plate outside of the bottom ring concrete is used. A drainage structure for constructing a double shell storage tank, characterized in that a drainage pipe is provided from either one of the central bottom slabs inside the bottom ring concrete toward the outside of the storage tank.