JP3055066B2 - Drainage method and structure when constructing double shell storage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention prevents rainwater from accumulating in a concrete outer tank during construction of a double-shell low-temperature storage tank comprising an outer concrete tank and an inner metal tank. And a method and structure for discharging rainwater to the outside of a concrete outer tank.

(Problems to be solved by the prior art and the invention) The outer shell is made of concrete, and the double shell low-temperature storage tank that stores the low-temperature liquefied gas in the inner tank has the periphery of the concrete plate on the pile hardened by embankment or crushed stone. , The so-called Vetaslab foundation,
Alternatively, on a so-called stilt type foundation on which a concrete slab is provided on an anchor pile at a predetermined interval from the ground, a bottom slab serving as the bottom of the concrete outer tank is constructed, and furthermore, the bottom slab and the lower corner of the outer tank side wall are connected. A footing portion is constructed, and then the side walls are sequentially stacked on the footing portion from the lower stage to the upper stage.

Before the work of stacking the side walls of the concrete outer tank, the bottom concrete ring part just below the inner tank side plate that stores the storage liquid, the outer peripheral edge of the inner tank bottom plate, and the lowermost inner tank side plate are constructed.
The inner tank side plates are also stacked in parallel with the stacking of the outer tank side walls, and the inner tank roof and the outer tank roof are assembled on the inner tank side plates and the outer tank side walls. After that, it is common to construct a bottom cold insulation layer, a side cold insulation layer between the inner and outer tanks, and a bottom plate of the inner tank.

As mentioned above, since the outer tub roof is constructed almost at the end, after the bottom slab and side walls of the concrete outer tub are constructed, the construction period will be several months until the outer tub roof is completed. Rainwater entered the concrete outer tank and stayed there, causing great effort and difficulty in removing the rainwater.

Also, draining this rainwater required a drainage pump with a high discharge pressure over a high concrete side wall, a long hose and a power cord.

In addition, it was necessary to constantly consider drainage so that the cold storage layer would not be submerged or wet by the accumulated rainwater, and it was necessary to implement drainage measures and monitoring systems even at night.

In order to solve the above-mentioned problems, the applicant of the present invention has applied for a device for carrying out the equipment for draining natural rainwater disclosed in Japanese Utility Model Application Laid-Open No. 60-121599. Problems to be solved remain, such as the problem that drainage cannot be performed and the safety problem associated with the cable tubing, etc., passing over the inner tank side sheet pile.

The present invention has been made to solve the above-mentioned problems of the prior art, and the object thereof is to construct the bottom and sides of the concrete outer tank and to construct the roof during the construction period. Another object of the present invention is to easily and efficiently discharge rainwater to prevent stagnation of rainwater over the entire area inside the concrete outer tank, and also to prevent a problem in storage tank strength after construction.

(Means for Solving the Problems) The drainage method at the time of constructing a double shell storage tank according to the present invention, when constructing a bottom plate of an outer tank, is performed using a drain drain provided from the bottom plate to the outside of the storage tank. And draining the rainwater collected on the bottom plate inside the outer tank, which is separated inside and outside by the bottom ring concrete supporting the inner tank side plate, is separately discharged to the outside of the storage tank from each of the separated inner and outer bottom plates. As shown in the figure, a drain pipe is opened at the outer peripheral bottom surface between the bottom ring concrete and the outer tank side wall, and is drained to the outside of the storage tank. The drain is drained from the storage tank.The drain is drained by filling with a mortar-filled solid material, such as concrete mortar, that is solidified after the outer tank roof construction is completed. It is

Further, the drainage structure at the time of double shell storage tank construction according to the present invention,
A drainage drainage structure used for draining rainwater from the outer tank during the construction period. The drainage is provided at the bottom of the bottom ring concrete supporting the inner tank side plate, and is inclined so that water can flow and wiring can be performed. A communication pipe, and a drain pipe opened to the outside of the storage tank by opening a drain port to one of the lower bottom plates of the outer peripheral bottom plate outside the bottom ring concrete or the central bottom plate inside the bottom ring concrete. The drain drain formed by the drainage pipe and the communication part is provided with a slope gradient so that the filler consisting of a strength member that solidifies after filling with concrete mortar and the like after the outer tank roof construction that eliminates rainwater infiltration is airtightly filled. It is formed in a structure having

(Action) A drainage pipe was opened between the bottom ring concrete and the outer tank bottom wall with an outer peripheral drainage opening, and a drainage pipe was opened outside the storage tank with a central drainage opening inside the bottom ring concrete. The drainage is formed using a drain pipe formed with a drain pipe, so rainwater that falls during the long-term construction period from the construction of the outer tank side wall to the construction of the outer tank roof supports the inner tank side plate. The water is efficiently discharged to the outside of the storage tank through the drain pipes through the drain holes opened in the inner and outer bottom slabs through the drain pipes without collecting on the inner and outer bottom slabs inside the concrete outer tank separated by the bottom ring concrete.

Furthermore, drainage formed by a drain pipe with an outer drain port opened on the outer bottom slab and a drain pipe with a central drain port opened on the center slab is performed when the bottom pipe of the outer tank is installed. It can be easily provided by embedding,
After the roof of the outer tank has been removed from the roof where the intrusion of rainwater has been completed, the area where the drain is formed can be integrated with the outer tank bottom slab or foundation by filling and filling with a filling consisting of a strength member that solidifies after filling with concrete mortar etc. it can.

In addition, a drainage port is opened to the lower part of the bottom ring concrete, which supports the inner tank side plate, at the lower part of either the inside or outside of the bottom ring concrete. In the drainage structure without drain formed with the drain pipe provided facing the bottom, the inclined communication part at the bottom of the bottom ring concrete, the inner and outer bottom slabs separated by the bottom ring concrete in the outer tank to discharge to the outside of the storage tank Rainwater can be efficiently collected and drained. Then, by using a wire cord, cable, hose, or the like for construction without penetrating the inner tub side plate mountain and using the communication portion, the congested construction work of the outer tub side wall and the inner tub side plate, or the inner and outer tub roof, etc. Can be constructed safely and efficiently.

Furthermore, the drainage drainage structure formed by the communication part provided at the lower part of the bottom ring concrete supporting the inner tank side plate and the drainage pipe provided toward the outside of the storage tank has a slope that slopes the communication part and the drainage pipe. Since it is formed with a drained structure, it is possible to fill it from the bottom of the drainage and fill it airtightly with a filling consisting of a strength member that solidifies after filling with concrete mortar etc. it can. And the drainage drain pipe filled with the filling is integrated with the filling to maintain the same robustness as the outer tank bottom plate or the foundation, and the communication part filled with the filling is also a storage tank that stores the storage The bottom ring concrete supporting the heavy inner tank side plate at the time of use does not hinder any strength or function. As described above, a simple temporary structure can be adopted in the drainage drainage structure in which the filler made of the strength member is filled after the outer tank roof is constructed.

(Example) The present invention will be described in detail with reference to the drawings of an example.

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

The drain pipe 6 of the drainer 1 is formed by embedding a water flow gradient when the footing portion 5 at the connection corner portion between the bottom plate 3 and the side wall 4 of the concrete outer tank is constructed on the foundation 2 of the storage tank. The distal end of the drainage pipe 6 inside the concrete outer tank opens an outer peripheral drainage port 12 on the outer peripheral bottom plate surface between the bottom ring concrete 8 supporting the inner tank side plate 7 and the outer tank side wall 4. A central drainage opening 13 is formed on the surface of the central bottom slab inside the concrete 8.

The outer peripheral drainage port 12 and the central drainage port 13 are provided one or more, that is, as many as required for drainage, at a low suitable place provided with a gentle slope so that rainwater is easily collected. The drain pipe 6 extending from the drain port extends alone or plurally in the middle and extends outward from the side edge of the base 2 of the storage tank to reach the drain outlet 14.

Rainwater falling during the construction period flows naturally in the drain 1 and is efficiently collected and discharged to the outside of the storage tank.

FIG. 2 shows a second embodiment according to the present invention, in which a drainage pipe is attached to a stilt type foundation provided on an anchor pile at a predetermined interval from the ground with a foundation for a storage tank and a concrete bottom slab. FIG. 4 is an explanatory side sectional view of a storage tank in which a part is omitted.

The foundation 2 of the storage tank and the bottom plate 3 of the concrete outer tank are formed on a plurality of piles 15 made of reinforced concrete embedded in the ground, and are formed in a so-called raised floor type in which a predetermined interval is provided with the ground surface.

The drain pipe 6 of the drainer 1 is formed by embedding the foundation 2, the bottom slab 3 and the footing portion 5. The drainage pipe 6 has an outer peripheral drainage port 1 opened to an outer peripheral bottom slab separated by a bottom ring concrete 8 supporting an inner tank side plate 7.
2 and the central drainage opening 13 opened to the inner central bottom slab, which is buried below, and the leading end reaches a drainage outlet 14 on the lower surface of the foundation 2 formed at a predetermined interval from the ground surface.

Drain drainer 1 is located in the right place where rainwater can easily collect so that the rainwater falling in the concrete outer tank is drained efficiently.
Provide one or more.

FIGS. 4A and 4B show a third embodiment according to the present invention, in which a communication portion 16 formed in an inclined structure as shown in FIG. An example is shown in which an opening is provided in either the center or the outer periphery.

The drain drain 1 shown in FIG. 4A has a structure in which the rainwater that has fallen on the outer peripheral side of the bottom ring concrete 8 collects at the center of the bottom slab through the communicating portion 16 and is collected from the central drainage port 13A together with the rainwater that has fallen to the center. The structure discharged to the outside is shown.

4B, the rainwater falling inside the bottom ring concrete 8 collects on the outer periphery of the bottom slab through the communicating portion 16 and the rainwater falling on the outer periphery together with the drainage hole 12 on the outer periphery.
This shows the structure that is discharged out of the storage tank from A.

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

The communication part 16 provided in the lower part of the bottom ring concrete 8 is
For example, half pipe 16A, angle material 16B, channel material
16C etc. are buried face down, and the slope is formed so that water can pass through the hollow interior.

Further, the communication portion 16 can be used by inserting an electric wire cord, a cable, a hose, or the like necessary for work. After the outer tub roof is installed and rainwater is no longer infiltrated, it is firmly and air-tightly filled with a filler made of a strength member that solidifies after filling, such as concrete mortar, as in the case of draining described later.

Also, the drain drain 1 shown in the first embodiment, the second embodiment, and the third embodiment has a drain outlet outside the lower storage tank after the roof of the outer tank is constructed and rainwater is no longer intruded. Pressing concrete mortar or the like into the drain pipe 6 from 14, confirming that the filler such as concrete mortar overflows from the outer peripheral drain port 12 and the central drain port 13, and airtightly plugging and filling (No. (See FIG. 3).

In addition, bottom ring concrete 8 supporting inner tank side plate 7
The outer peripheral drainage port 12 of the drain vent 1 provided from the outer peripheral bottom plate between the outer peripheral side wall 4 and the concrete outer tank side wall 4 has a strength to solidify the filling material therein with the lapse of time such as the concrete mortar described above. In place of the filling made of the member, a separable filling material such as continuous glass wool having excellent heat insulating properties is selected, and during repair and inspection work after the construction of the double shell storage tank, the outer peripheral portion of the drain drain 1 is used. After extracting the filler in the drain port 12, a structure in which an electric wire cord, a cable, a hose, or the like necessary for work can be inserted into the outer peripheral drain port 12 is also conceivable. In comparison with the above-mentioned temporary structure in which a filler made of a strength member is filled, more consideration is required for examining the passage strength and the like.

(Effects) According to the drainage method and structure of the double shell storage tank according to the present invention, the following effects are obtained.

A drain pipe with an outer peripheral drain opening between the bottom ring concrete and the outer tank bottom wall and piping outside the storage tank, and a drain pipe with a central drain opening inside the bottom ring concrete and piping outside the storage tank. The drainage is formed using the drain drain formed in the above, so rainwater that falls during the long-term construction period from the construction of the outer tank side walls to the construction of the outer tank roof will be drained by the bottom ring that supports the inner tank side plates. In order to efficiently drain water from the inside and outside of the tank outside the storage tank through drain pipes that open to the bottom plate inside and outside of the concrete without draining on the inside and outside bottom plates inside the concrete tank separated by concrete, drainage pumps during rainfall and drainage Drainage facilities such as hoses and power supplies, drainage work and monitoring are not required, and there is no danger that the cooling layer provided on the bottom of the outer tank will impair the function of the cooling material due to being hydrated or submerged. Therefore, a double shell storage tank composed of an outer concrete tank and an inner metal tank can be efficiently and safely constructed with high quality.

In addition, drainage formed by a drain pipe with an outer drain opening on the outer bottom slab and a drain pipe with a central drain opening on the center slab, drains the drain pipe when installing the outer tank bottom slab. It can be easily provided by embedding,
Since the outer tank roof where the intrusion of rainwater disappears is filled with a filling material consisting of a strength member that solidifies after filling with concrete mortar etc. after filling, the place where the drain is formed is integrated with the outer tank bottom plate or foundation, so strength is increased In addition, a strong outer tank bottom plate or foundation that does not cause any problem in function can be configured.

In addition, a drainage port is opened to the lower part of the bottom ring concrete, which supports the inner tank side plate, at the lower part of either the inside or outside of the bottom ring concrete. In the drainage structure without drain formed with the drain pipe provided facing the bottom, the inclined communication part at the bottom of the bottom ring concrete, the inner and outer bottom slabs separated by the bottom ring concrete in the outer tank to discharge to the outside of the storage tank Not only can rainwater be collected and drained efficiently, but also the wire cords, cables, hoses, etc. for construction can be used by passing through the communication part without going over the inner tank side plate. Tank side wall and inner tank side plate,
Alternatively, congested construction work such as inner and outer tank roofs can be performed safely and efficiently.

Furthermore, the drainage drainage structure formed by the communication part provided at the lower part of the bottom ring concrete supporting the inner tank side plate and the drainage pipe provided toward the outside of the storage tank has a slope that slopes the communication part and the drainage pipe. Since it is formed with a drained structure, it is possible to fill it from the bottom of the drainage and fill it airtightly with a filling consisting of a strength member that solidifies after filling with concrete mortar etc. Because the drainage drain pipes are drained, they can be integrated with the filler to maintain the same robustness as the outer tank bottom plate or the foundation.The communication part filled with the filler uses a storage tank that stores the storage unit. There is no concern about the strength and function of the bottom ring concrete supporting the heavy inner tank side plate at the time, and the structure becomes safer. The drain-drain structure for filling with the filling material made of the strength member after the outer tank roof construction can be formed at low cost because a simple temporary structure can be adopted.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a storage tank in which a drain pipe is provided in a Vetas slab foundation and a part thereof is omitted, and FIG. 2 is a second embodiment according to the present invention. In the example of
FIG. 3 is an explanatory side sectional view of a storage tank in which a drainage pipe is provided on a stilt type foundation, and FIG. 3 is an entire storage tank showing a state after filling the drainage pipe of FIG. 1 with a filler. 4A and 4B show a third embodiment according to the present invention, in which a communicating portion is provided below the bottom ring concrete, and a drain port is provided near the center of the bottom plate or on the outer periphery. FIG. 5 is a side cross-sectional explanatory view showing a state in which the storage tank is provided at a lower portion, with a part of a lower portion of the storage tank being removed, and FIG. 1 drain drain 2 foundation 3 bottom plate 4 side wall 6 drain pipe 7 inner tank side plate 8 bottom ring concrete 16,16A, 16B, 16C communication part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F17C 3/00 F17C 13/08 302 B65D 90/00-90/02 E04H 7/00-7/20

Claims (2)

(57) [Claims] 1. A drainage method for discharging rainwater in an outer tank during a construction period from constructing an outer tank side wall of a double shell storage tank comprising a concrete outer tank and a metal inner tank to construct an outer tank roof. The draining method is performed by using a drain provided from the bottom plate to the outside of the storage tank when the bottom plate of the outer tank is constructed, and the drain is removed by a bottom supporting the side plate of the inner tank. An outer peripheral portion between the bottom ring concrete and the outer tank side wall so that rainwater accumulated on the bottom plate inside the outer tank separated inside and outside by the ring concrete is individually discharged to the outside of the storage tank from each of the separated inner and outer bottom plates. A drain pipe opened to the outside of the storage tank with an outer peripheral drain opening at the bottom plate surface, and a drain pipe opened to the outside of the storage tank with a central drain opening at the center bottom plate inside the bottom ring concrete. , The drain drain is rain Double-shelled tank during construction method of the drainage, characterized in that filling with filling a filler composed of strength members which solidified after filling, such as concrete mortar after outer tank roof construction which eliminates the intrusion. 2. Drainage of rainwater in the outer tank during the construction period until the outer tank roof is constructed by constructing the outer tank side wall and the inner tank side plate of the double shell type storage tank composed of a concrete outer tank and a metal inner tank. Drain drainage structure used for draining, the drain drain is provided in the lower part of the bottom ring concrete supporting the side plate of the inner tank, a communication portion provided with a slant so that water can be passed and wiring,
Outer peripheral bottom slab outside the bottom ring concrete, or central bottom slab inside the bottom ring concrete, one of the lower bottom slabs with a drain port opened and a drain pipe provided to the outside of the storage tank. The drain drain formed by the drainage pipe and the communication part has a slope with a slope such that a filler formed of a strength member that solidifies after filling with a concrete mortar or the like after construction of an outer tank roof that prevents rainwater intrusion is airtightly filled. The drainage structure at the time of construction of the double shell storage tank, which is formed in