JP2003321943A - Method of construction of reservoir and assembling member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of construction of a reservoir and its assembling members for assembling and constructing the reservoir with good construction performance by improving workability of attaching and removing of temporary construction members and improving leak-prevention performance and balancing stability, by making the temporary construction members simple and functional, which members are used for assembling work of side boards by means of air-lifting. <P>SOLUTION: A flexible sealing member, which is removably attached to the whole periphery of a lower part of an inner surface of the uppermost side end board, carries out sealing while being in contact with a generally ring-shaped next stage side board wound around an outer surface of the uppermost side board when the sealing member is lifted up from a state of contact with a surface of a bottom plate, and on the other hand, the flexible seal member, which is attached onto the bottom plate, carries out sealing while being in contact with the next stage side board under pressure when the flexible sealing member is lifted up from the state of contact with the inner peripheral surface of the uppermost side board. Thereafter, the flexible sealing member similar to the one used for the uppermost side board is mounted onto the generally ring-shaped side boards to be lifted up one by one and the lower part of the next stage side boards wound around the outer periphery of the side board to be lifted up are sealed by the flexible sealing member on the bottom plate. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a cylindrical storage tank with a roof for storing petroleum, water, low-temperature liquefied gas, etc., and more specifically, after assembling an outer tank roof and / or an inner tank roof and the uppermost side panel, Float the whole body with air, insert the side plate of the next stage below it and weld and join it, and repeat this air floating and inserting and fixing the side plate of the next lower stage in order to build the entire side plate at a low position on the ground. The present invention relates to a storage tank construction method and an assembly member used in the construction method.

[0002]

2. Description of the Related Art A conventional general method for constructing a cylindrical storage tank with a roof is to lay a bottom plate on a ground foundation, set a bottom side plate upright on the bottom plate, and install a next side plate at the upper end of this side plate. Weld the side walls by welding the side plates to the upper end one by one, and then build the roof of the storage tank on the upper part of the side wall with a stand, a crane, or air levitation.

[0003]

In the conventional method for constructing a cylindrical storage tank with a roof, the conventional installation method for a cylindrical storage tank has to be oversized, complicated, and robust in order to erect the mounting base high, and a large amount of temporary assembly equipment is required. In addition, the setting method is a labor-intensive assembling method, and requires a wide installation place and a moving place because a tall and large crane is operated.

Further, it is difficult to ensure safety because it involves work at a high place on a pedestal that is erected high and suspension work using a large crane.

Although a construction method of assembling the side plates by air levitation is also considered, a temporary assembly member is large, a sealing device has a complicated and robust structure, and a balancing device is large. In addition, there is a problem that it is difficult to prevent leakage from the gap of the seal portion and to handle the flexible seal film so that wrinkles do not occur, and it becomes difficult to align the side plates.

The present invention has been made to solve the above-mentioned problems, and makes a temporary member used for assembling and constructing a side plate by air levitation simple and functional so that workability of attaching and detaching the temporary member can be improved. It is intended to provide a storage tank construction method and an assembly member capable of assembling and constructing a storage tank with improved safety, improved leakage prevention, and improved equilibrium stability, and being safe and easy to construct.

[0007]

According to a first aspect of the present invention, there is provided a method of constructing a storage tank, wherein a roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed. In the method of constructing a storage tank in which the roof and the uppermost side plate are floated and the substantially ring-shaped side plates are sequentially welded to each other to be assembled, a flexible seal member detachably attached to the entire inner surface lower periphery of the uppermost side plate is , While contacting and sealing on the bottom plate to seal while contacting the substantially ring-shaped next-stage side plate wound around the outer peripheral surface of the uppermost-stage side plate during floating, while the flexible seal member mounted on the bottom plate is From the state of contacting the inner peripheral surface of the uppermost side plate in an elastic state, when floating, it seals while contacting the next stage side plate in the elastic state, and thereafter, the substantially ring-shaped side plate that is sequentially floated is the same as the uppermost side plate. Flexible seal member is attached and sealed Rutotomoni is intended to seal in the flexible seal member on the lower bottom plate of the next stage side plates wound on the outer peripheral surface of the side plate to float.

In the method for constructing a storage tank according to the second aspect of the present invention, a roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed to supply the air to the roof and the uppermost stage. In a method for constructing a storage tank in which side plates are floated and the substantially ring-shaped side plates are sequentially welded to each other to be assembled, the uppermost side plate is wound in a state in which an end portion of the next-stage substantially ring-shaped side plate is superposed, and the winding is performed. Attach a binding device such as a chain block on the outer surface of the unwelded side plate overlapping part to shorten and adjust the circumferential length of the side plate, and after air is floated, reduce the circumferential length to a specified length with the binding device. The side plate overlapping portion is cut in the vertical direction and welded to assemble a ring-shaped side plate.

In the method for constructing a storage tank according to a third aspect of the invention, a roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed to supply air to the roof and the uppermost stage. In a method of constructing a storage tank in which the side plates are floated and the substantially ring-shaped side plates are sequentially welded to each other to be assembled, the substantially ring-shaped side plates to be floated including the uppermost side plate are substantially wound around the outer peripheral surface of the side plate to be floated. Along the ring-shaped next-side side plate and while being guided by an equilibrium device using a guide wire, etc. inside the storage tank, it levitates evenly, and at the time of levitation with a levitation adjustment jig installed on the outer surface of the side plate to float It prevents the side plates from rotating and positions the levitation.

Among the assembling members used in the method for constructing the storage tank of the first invention, the flexible seal member detachably attached to the lower part of the inner peripheral surface of the side plate to be levitated is provided from the gap at the lower end of the side plate to levitate. It is formed of a side sealing film that prevents the air leakage of the side plate, and the side sealing film is fixed to a fixing member at a predetermined height position on the inner peripheral surface of the side plate, and a predetermined length is provided from a corner portion corresponding to the bottom of the tank to an inside corresponding to the bottom plate. The flexible seal member that is extended and attached near the periphery of the bottom plate is a bottom that prevents air leakage from the gap between the bottom plate and the lower end of the next side plate that is wound around the outer peripheral surface of the substantially ring-shaped side plate to be floated. It is formed of a sealing film, and the bottom sealing film is fixed to a fixing member on the bottom plate at a position distant from the end of the side sealing film and overlapped on the upper side of the side sealing film in the side plate direction from the corner portion corresponding to the lower part of the storage tank. To form an extension, The upper surface of the bottom sealing film, is provided with a presser plate Chigae the height of the pressing portion of the side plate.

Among the assembling members used in the method for constructing the storage tank of the third invention, the above-mentioned equilibrium device is a stand installed upright at a predetermined interval in the vicinity of the periphery of the bottom plate inside the storage tank, and a top and bottom mounted on this stand. Formed by a plurality of pulleys, a guide wire that is radially suspended from the pulleys, and a guide jig that is attached to the inner surface of a substantially ring-shaped side plate that locks on the guide wires and floats so as to rise evenly It was done.

Among the assembling members used in the method for constructing the storage tank of the third invention, the above-mentioned levitation adjusting jig is a substantially ring-shaped side plate of the next stage wound around the outer peripheral surface of the floating substantially ring-shaped side plate. A lower bracket provided near the upper end of the outer peripheral surface, an upper bracket provided so as to face the lower outer peripheral surface of the side plate located directly above the side plate to be levitated, and a levitation adjustment bolt that spans between the upper bracket and the lower bracket for tightening. It was formed by and.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method for constructing a storage tank according to the present invention,
The assembly member used in the construction method will be described with reference to the drawings, taking a case of a suspension deck type double shell low temperature storage tank having a raised floor bottom plate as an example.
1 to 3 show a situation in which side plates are assembled and constructed by air levitation. FIG. 1 is a schematic diagram before starting air levitation, FIG. 2 is a schematic diagram during air levitation, and FIG. It is a schematic diagram in the state where the air levitation of the uppermost 1st step side plate was completed.

Numeral 1 is a raised floor bottom slab, which is formed on the ground in a reinforced concrete structure. Reference numeral 2 denotes a metal bottom plate of the storage tank, which is laid on the raised floor bottom plate 1. On this bottom plate 2, the upper first side plate 3a located at the uppermost stage of the substantially circular ring shape, the roof plate 4a and the compression ring 4b located at the corner, and the suspension deck 4 corresponding to the inner tank roof.
c is assembled and constructed in an integrated closed space. The upper first side plate 3a is installed upright on the bottom plate 2 on the inner surface of the side plate at a position corresponding to the inner diameter of the storage tank, and a plurality of pieces or piece plates 6a are attached in a spaced manner. The upper first-stage side plate 3a is arranged in a ring shape along 6a, the vertical joints of the side plates are welded to each other, and further the outer side is moved to the outer position in consideration of the plate thickness of the side plate to be inserted next. A piece or piece plate 6b for restricting and positioning is attached.

Next, the second side plate 3b from the top is brought into close contact with the outside of the upper first side plate 3a assembled in the above-mentioned substantially ring shape, and only one layer of the vertical joints of the side plates is welded to each other. The side plate overlapping part 11 that overlaps with is provided and wound, and a chain block for tightening is attached, and the lower end is assembled into a ring shape without welding. Then, a floating prevention fixing jig 6 including a plurality of turnbuckles 6c and the like is installed on the outer peripheral lower end portion of the wound upper second side plate 3b so as to be spaced from each other.

The air blower 5 for assembling and constructing the side plates by air levitation comprises a blower 5a, a piping facility 5b, and an air inlet 5c. In the case of a storage tank placed on the ground foundation without the stilt bottom plate 1, the air inlet 5c
Is provided by drilling a part of the foundation and opening a hole in the bottom plate 2, or
Alternatively, a manhole or nozzle attached to the roof 4 is used.

Reference numeral 7 denotes a balancer, which has a plurality of columns 7a slightly higher than the side plate height, standing upright at symmetrical positions on the bottom plate 2, and a plurality of guide rollers 7b mounted above and below the column 7a. A guide jig 7c composed of a U bolt or a wire clip is attached to a rib plate on the lower inner surface of the eye side plate 3a, a guide wire 7d is fixed to the guide jig 7c, and the guide wire 7d is suspended on a guide roller 7b to form a bottom plate. It is stretched in a radial pattern on 2 and is formed so that the roof and the side plate maintain a horizontal state when they float, and rise smoothly and evenly.

As shown in FIG. 2, the flexible sealing member 8 for preventing air leakage prevents air leakage from the upper surface of the bottom plate at the lower end of the wound upper second side plate 3b.
Bottom sealing film 8a provided with a holding plate 16 shown in FIG. 6 and described later
And a side seal film 8b that prevents air from leaking from a gap extending from the lower surface of the upper first-stage side plate 3a to the upper side surface during floating. The reference numeral 9 designates a contact plate for matching the outer peripheral surface of the upper first-stage side plate 3a and the outer peripheral surface of the next upper-stage second side plate 3b located below the upper-stage side plate 3a so that the outer peripheral surfaces thereof are brought into contact with each other. , The skin contact pad 9 is the upper second side plate 3b to be inserted.
A plurality of them are provided at a predetermined pitch on the outer peripheral surface of the. Reference numeral 10 denotes a levitation adjusting jig, which includes a lower bracket 10a, an upper bracket 10b, and a levitation adjusting bolt 1 shown in FIG. 7 and described later.
0c and the like.

After the roof and the uppermost side plate are installed as described above and shown in FIG. 1, the floating work shown in FIGS. 2 to 3 is performed. As shown in FIG. 2, air is introduced into the lower part of the roof from the air inlet 5c using the blower 5a, and the bottom sealing film 8a
The roof plate 4a and the upper first-stage side plate 3 with the side seal film 8b and the side seal film 8b in contact with each other in an elastic state to seal the gap and prevent leakage.
The surface a is guided along the inner surface of the upper second insertion side plate 3b, and is guided by the balancing device 7 such as the guide wire 7d to be smoothly levitated.

Then, as shown in FIG. 3, the roof and the top 1
At the same time as the upper side second plate 3b is pulled up to the inside of the storage tank by using the binding device (not shown) of the side plate overlapping part while the upper side plate 3a is floating to the uppermost part of the upper second side plate 3b. Strike a square arrow in the gap between the piece attached to and the upper second side plate,
The upper second stage side plate 3b located below is pushed in the direction of the horizontal arrow in the figure, and is pressed against the piece on the inner face of the side plate to hold the perfect circle. Next, the skin contact pad 9 is pressed against the upper first-stage side plate 3a so that the air floating roof and the upper first-stage side plate 3a do not move horizontally and the axes are aligned, and the fluctuation at the floating end is smoothed. The levitation adjusting jig 10 for positioning so as not to rotate and move in the circumferential direction, that is, the levitation adjusting bolt 10c between the lower bracket 10a and the upper bracket 10b is adjusted and tightened and fixed.

After the temporary joint welding of the horizontal joint portions of the upper first side plate 3a and the upper second side plate 3b is performed, the air insertion is stopped. Then, the side plates of the superposed side plate superposition section 11 are superposed and removed by gas cutting, and groove processing is carried out to manufacture a vertical joint section. Subsequently, the welding of the second and subsequent layers of the vertical joint portion of the upper second stage side plate 3a is performed, and further the main joint of the horizontal joint portion of the upper first stage side plate 3a and the upper second stage side plate 3b is performed, and the upper second stage of the lower portion. Eye side plate 3
Integral structure with b.

Next, according to the same procedure as above, although not shown, the side plate (3c) located in the next stage from the top is wound around the outer periphery of the upper second stage side plate 3b fixed in the above-mentioned ring shape to assemble. . Then, as in the case of FIG. 1, the air levitation sealing device and the like are installed, and the air levitation work is performed in the same manner as in FIGS. 2 to 3. By repeating the series of construction steps shown and described in FIGS. 1 to 3 above, the side plates 3 are assembled at the lower position on the bottom plate 2 by sequentially welding the required number of side plates from the upper stage to the lower stage by air levitation. Finally, the bottom side plate and the bottom plate are welded to complete the construction of the outer tank.

Although not shown, after the outer tank is constructed, a working opening is provided in a part of the outer tank side plate, and cold insulation work for the inner tank, laying of the bottom plate, and welding are performed. And
After constructing the inner tank of the storage tank by constructing the inner tank of the storage tank on the rotating rail with the inner tank side plate attached to the inner surface of the outer tank using a small crane or jack-up method, the opening for the above work is constructed. The suspension deck type double shell low temperature storage tank is completed. In this way, the construction method of assembling the inner tank after constructing the outer tank can work without affecting the weather such as rain and wind, so the efficiency of the construction period can be shortened and a high-quality storage tank can be provided. You can

FIG. 4 is a partially omitted horizontal cross-sectional explanatory view showing the positional relationship between the side plates located inside and outside and the balancing device, and FIG. 5 is a side view explanatory view showing a part of the side plate overlapping portion.
The equilibrium device 7 includes a column 7a, a guide roller 7b, a guide jig 7c, and a guide wire 7d, and is arranged on the bottom plate 2 in a plane radial pattern. The first side plate 3a from the top is a fixing jig 6 (only a part of which is shown) including pieces or piece plates 6a and 6b arranged at equal intervals along the circumference of the storage tank inner diameter position. ) And assembled and coupled in a substantially ring shape, and the second side plate 3b from the top is placed in contact with the outside so as to be wound in a substantially ring shape.

The second-stage side plate 3b is provided with two side plate overlapped portions 11, and the vertical joints other than the side plate overlapped portion 11 are formed of a single layer in order to secure the sealing property and suppress the occurrence of welding distortion. Just weld. As shown in FIG. 4 and FIG. 5, the side plate overlapping portion 11 is provided with an overlapping portion that does not weld in the vertical direction, and the binding device 12 presses the first side plate and the second side plate so that there is no gap between them. To fix. This binding device 12
Is formed by fixing members 12a, 12a provided at positions where both sides of the edge of the side plate overlapping portion 11 are bridged, and a tensioning tool such as a chain block 12b or a turnbuckle for tensioning between them. In addition, the side plate overlapping part 11 is shown in the case where it is provided at two positions facing each other on the side plate 3b, but it is provided at one position or at a plurality of positions corresponding to the size of the diameter of the storage tank. As for the positions of the side plates, the vertical position of each side plate is shifted so as to maintain the arrangement balance with respect to the entire side plate.

After the inner side plate 3a is floated by air, the chain block 12b is tightened and the side plate 3b is tightened.
At the same time as shrinking the circumference of the side plate, a square arrow is inserted between the piece attached to the outside of the side plate 3b and the side plate, and the outside side plate 3b is pushed in at the lower end to be pressed into contact with the piece attached to the inside. Secure the circle and cut off the excess side plate overlapped part 11 to overlap,
Grooves are processed and the vertical joints are welded and joined in a substantially circular ring shape having a predetermined circumferential length.

6A and 6B are explanatory longitudinal sectional views showing the lower side plate in an enlarged manner. FIG. 6A shows a mounted state of the flexible seal member 8, and FIG. 6B shows a state in the middle of floating. As shown in FIG. 6A, first, the side seal film 8b is fixed to the fixing member 14 provided at a predetermined height position on the inner peripheral surface of the upper first side plate 3a. The side sealing film 8b extends a predetermined length from the corner portion corresponding to the lower portion of the storage tank to the inside corresponding to the bottom plate 2. Next, the bottom sealing film 8a is fixed to the fixing member 15 on the bottom plate 2 at a position apart from the extension tip of the side sealing film 8b. The bottom seal film 8a is superposed on the upper part of the side seal film 8b and extends from the corner portion corresponding to the lower part of the storage tank toward the upper side plate.

A pressing plate 16 fixed to the fixing member 15 is provided on the upper surface of the bottom seal film 8a. The holding plate 16 is formed of a wide thin plate formed by dividing the holding plate 16 in the circumferential direction. As shown in FIG. 6B, the bottom sealing film 8a is formed on the upper first side plate 3a as the roof and the side plate float. Side seal film 8
When moving from the upper part of b to the upper second side plate 3b, its own weight,
Alternatively, the bottom seal film 8a does not roll up or contract due to the elastic contact by a spring attachment or the like, and has a function of firmly sealing the corner portion corresponding to the lower part of the storage tank.

Then, as illustrated in FIG. 7, the holding plate 1
6 is a holding plate 16 which is vertically long and holds the bottom sealing film 8a above.
a and a holding plate 16b that presses the bottom sealing film 8a below the bottom sealing film 8a with a short vertical length, and are arranged in alternate steps. As described above, by alternately changing the pressing height positions to the side plate and distributing the contact portions, the pressing points are different and the pressing load is distributed, so that the pressing area can be made wider and it is more difficult to roll up. Further, when the bottom seal film 8a moves from the upper first-stage side plate to the upper second-stage side plate, the lower holding plate 1 is first moved.
6b is transferred to the upper second-stage side plate, and the bottom seal film 8a is pressed by both the upper first-stage side plate and the upper second-stage side plate by the retainer plate 16b.
Then, the holding plate 16a at the next higher position moves to the upper second side plate, and the movement of the bottom seal film 8a at the stepped portion does not become wrinkled or entangled, and a smooth sealing property can be achieved.

FIG. 8 is a vertical cross-sectional explanatory view showing the balancing device 7 and the levitation adjusting jig 10 in a state in which the upper and lower side plates 3, 3a, 3b, 3c are brought into contact with each other after air levitation. The side plates 3a and 3b are supported by a balancer 7 including a column 7a standing upright in a circumferentially spaced manner, a plurality of guide rollers 7b, a guide jig 7c fixed to the side plate, and a guide wire 7d suspended in the direction of the arrow. Air is levitated smoothly, evenly and vertically while maintaining horizontal. And top 3
The step side plate 3c is pushed in the direction of the horizontal broken line arrow in the figure, and the vertical surfaces of the side plate 3b and the side plate 3c are matched with each other by using a skin contact pad (not shown), and at the same time, the lower bracket 10
It is positioned and fixed by a levitation adjusting jig 10 for preventing excessive levitation, which is composed of a levitation adjusting bolt 10c laid between a and an upper bracket 10b located immediately above.
For positioning and fixing with the levitation adjusting bolt 10c, a rod-shaped bolt is inserted into a long hole provided in the upper bracket 10b in the center direction of the storage tank to prevent rotational movement and adjust the shaft center position and levitation distance with a nut for good workability. Tighten.

[0031]

As described above, according to the method of constructing the storage tank of the first invention, the roof and the substantially ring-shaped uppermost side plate are constructed on the bottom plate, and air is supplied in a state where the constructed closed space is sealed. In the method of constructing a storage tank in which the roof and the uppermost side plate are floated and the substantially ring-shaped side plates are sequentially welded to each other to be assembled, a flexible seal member removably attached to the entire lower circumference of the inner surface of the uppermost side plate. However, from the state of contacting and sealing on the bottom plate to seal while contacting with the substantially ring-shaped next-stage side plate wound around the outer peripheral surface of the uppermost-stage side plate when floating, the flexible seal member mounted on the bottom plate is , A state in which the inner peripheral surface of the uppermost side plate is in contact with the inner peripheral surface in an elastic state is sealed while contacting with the next stage side plate in an elastic state during floating, and thereafter, a substantially ring-shaped side plate that is sequentially floated is similar to the uppermost side plate. Flexible seal member is attached and sealed In addition, since the lower part of the next-stage side plate wrapped around the outer peripheral surface of the side plate to be levitated is sealed by the flexible seal member on the bottom plate, it is efficient to prevent leakage at each seal part by the divided flexible seal member. Since it is good and does not require the use of a wide sealing member, it does not become wrinkled or entangled, and the sealing member in contact with the elastic state also has good adhesion and can improve the sealing performance. The handling of the members is easy and the workability of attaching and detaching is improved.

The method of constructing a storage tank according to the second aspect of the present invention is such that the uppermost side plate on which air is floated is wound with the end portion of the substantially ring-shaped side plate of the next stage being superposed, and the wound unwelded side plate is superposed. Attach a binding device such as a chain block on the outer surface of the part to reduce the peripheral length of the side plate and adjust it.After air is floated, the peripheral length is reduced to a predetermined length by the binding device, and the excess side plate overlaps in the vertical direction. Since the ring-shaped side plate is assembled by cutting and welding, the side plate overlapping part is pressed into contact with the binding device to prevent air from leaking from the side plate side part, and the circumferential length can be easily adjusted by tightening. Then, after removing the excess portion and welding, the side plate can be constructed with good workability.
In this way, a series of work of assembling and cutting the side plate, welding
It does not require a temporary scaffold and can be safely and efficiently operated at a low position on the ground.

In the method for constructing the storage tank of the third invention, the substantially ring-shaped side plate for floating the air is guided along the substantially ring-shaped next-stage side plate wound around the outer peripheral surface of the side plate for floating, and is guided inside the storage tank. While evenly floating while guiding it to a balancing device that uses wires, etc., the side plate outer surface to be levitated and the levitation adjustment jig attached to the outer surface of the next-stage side plate prevent the side plate from rotating during levitation and the levitation positioning. It is possible to maintain the equilibrium state of the side plates, to levitate smoothly and evenly and safely without causing an unbalanced load, and to stop and fix at the levitation terminal end safely and with good workability.

Among the assembling members used in the method for constructing the storage tank of the first invention, the flexible seal member detachably attached to the lower portion of the inner peripheral surface of the side plate to be levitated is the space from the lower end of the levitating side plate. It is formed of a side sealing film that prevents the air leakage of the side plate, and the side sealing film is fixed to a fixing member at a predetermined height position on the inner peripheral surface of the side plate, and a predetermined length is provided from a corner portion corresponding to the bottom of the tank to an inside corresponding to the bottom plate. The flexible seal member that is extended and attached near the periphery of the bottom plate is a bottom that prevents air leakage from the gap between the bottom plate and the lower end of the next side plate that is wound around the outer peripheral surface of the substantially ring-shaped side plate to be floated. It is formed of a sealing film, and the bottom sealing film is fixed to a fixing member on the bottom plate at a position distant from the end of the side sealing film and overlapped on the upper side of the side sealing film in the side plate direction from the corner portion corresponding to the lower part of the storage tank. To form an extension, Since the top plate of the bottom seal film is provided with a presser plate with a different height of the presser part to the side plate, each seal film divided into the side seal film and the bottom seal film effectively prevents leakage from each gap. Since it is not necessary to use a wide, monolithic structure that is difficult to handle, it does not become wrinkled or entangled, and the adhesion of the sealing film is increased by pressing, making it easy to handle and easy to install and remove. improves. Further, since the pressing load of the bottom seal film is dispersed by the pressing plates having different pressing height positions, it is possible to widen the pressing area, and it is more difficult to roll up and the adhesion can be improved. When the membrane moves from the upper first side plate to the upper second side plate, there is a two-stage transition,
The sealing performance can be improved without wrinkling or being caught.

Among the assembling members used in the method for constructing the storage tank according to the third aspect of the present invention, the above-mentioned equilibrium device comprises a stand installed upright at a predetermined interval in the vicinity of the peripheral edge of the bottom plate inside the storage tank, and a top and bottom mounted on this stand. Formed by a plurality of pulleys, a guide wire that is radially suspended from the pulleys, and a guide jig that is attached to the inner surface of a substantially ring-shaped side plate that locks on the guide wires and floats so as to rise evenly Therefore, it is possible to maintain the equilibrium state of the air-floating roof and the side plate, and to levitate smoothly, uniformly and safely without causing an unbalanced load.

Among the assembling members used in the method for constructing the storage tank of the third invention, the above-mentioned levitation adjusting jig is a substantially ring-shaped side plate of the next stage wound around the outer peripheral surface of the floating substantially ring-shaped side plate. A lower bracket provided near the upper end of the outer peripheral surface, an upper bracket provided so as to face the lower outer peripheral surface of the side plate located directly above the side plate to be levitated, and a levitation adjustment bolt that spans between the upper bracket and the lower bracket for tightening. Since it is formed with the levitation adjustment jig, it is possible to prevent rotational movement in the circumferential direction, and it is easy to perform positioning and fine adjustment by restricting levitation near the levitation end part. It can be stopped and fixed safely and with good workability.

[0037]

[Brief description of drawings]

FIG. 1 is a partially omitted vertical cross-sectional explanatory view showing a state before starting air floating in an embodiment of a method for constructing a storage tank according to the present invention.

FIG. 2 is a vertical cross-sectional explanatory view, partly omitted, showing a situation during air floating, following FIG. 1;

FIG. 3 is a partially omitted vertical cross-sectional explanatory view showing the situation at the end of air floating after FIG. 2;

FIG. 4 is a horizontal cross-sectional explanatory view showing a positional relationship between a side plate and a balancing device, with some parts omitted.

5 is a side view showing the side plate overlapping portion of FIG. 4. FIG.

FIG. 6 is a vertical cross-sectional explanatory view showing an enlarged lower part of the side plate,
(A) shows the mounting state of the flexible seal member, and (b) shows the state in the middle of its floating.

FIG. 7 is a perspective cross-sectional explanatory view showing an enlarged lower part of the side plate,
An example of mounting the bottom seal film and the pressure plate is shown below.

FIG. 8 is a vertical cross-sectional explanatory view showing a balancing device and a flying height adjusting jig.

[Explanation of symbols]

1 base plate 2 bottom plate 3 side plate 3a upper first step side plate 3b upper second step side plate 3c
Upper third side plate 4 Roof 4a Roof plate 4b Compression ring 4c Suspension deck (inner tank roof) 5 Air blower 5a Blower 5b Piping equipment 5c Air inlet 6 Fixing jig 6a, 6b Piece or piece plate 6c Turnbuckle 7 Balance Device 7a Strut 7b Guide roller 7c Guide jig 7d Guide wire 8 Flexible seal member 8a Bottom seal film 8c side seal film 9 Skin contact patch plate 10 Levitation adjustment jig 10a Lower bracket 10b Upper bracket 10c Levitation adjustment bolt 11 Side plate Polymerization part 12 Binding device 12a Fixing member 12b Tension material 12c Chain block 14 side seal film attachment member 15 Bottom seal film attachment member 16, 16a, 16
b Holding plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masanori Tamada             4-21 Ginza Stock Exchange, Chuo-ku, Tokyo             Inside the Ishii Ironworks F-term (reference) 3E070 AA03 AB02 AB03 AB32 DA01                       JB01 QA04

Claims (6)

[Claims] 1. A roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed so that the roof and the uppermost side plate are floated, and the substantially ring-shaped one by one. In a method of constructing a storage tank by welding side plates to each other, a flexible seal member removably attached to the entire lower portion of the inner surface of the uppermost side plate comes into contact with the bottom plate and seals the uppermost stage while floating. While sealing while contacting the substantially ring-shaped next-stage side plate wound around the outer peripheral surface of the side plate, the flexible sealing member mounted on the bottom plate is in contact with the inner peripheral surface of the uppermost side plate in an elastic state. From the above, when it floats, it seals while coming into contact with the next-stage side plate in an elastic state, and thereafter, a flexible seal member similar to the uppermost-stage side plate is attached and sealed to the substantially ring-shaped side plate that is sequentially floated. Wrapped around the outer surface A method for constructing a storage tank, characterized in that the lower part of the next-stage side plate is sealed with a flexible sealing member on the bottom plate. 2. A roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed so that the roof and the uppermost side plate are floated, and the substantially ring-shaped one by one. In the method for constructing a storage tank by welding side plates to each other, the uppermost side plate is wound in a state in which the ends of the substantially ring-shaped side plates of the next stage are superposed, and the outer surface of the unwelded side plate superposed portion is wound. Attach a binding device such as a chain block to reduce the peripheral length of the side plate and adjust it, and after air floating, reduce the peripheral length to a predetermined length with the binding device and cut the extra side plate overlapping part in the longitudinal direction. A method for constructing a storage tank, which comprises assembling a ring-shaped side plate by welding. 3. A roof and a substantially ring-shaped uppermost side plate are constructed on a bottom plate, and air is supplied in a state where the constructed closed space is sealed so that the roof and the uppermost side plate are floated, and the substantially ring-shaped structure is successively formed. In a method for constructing a storage tank by assembling side plates by welding, side plates having a substantially ring shape including the uppermost side plate are floated along a substantially ring-shaped next-stage side plate wound around the outer peripheral surface of the side plate to be floated, In addition, it is levitated evenly while guiding it to the equilibrium device using a guide wire etc. inside the storage tank, and the side plate outer surface to be levitated and the levitation adjustment jig attached to the outer surface of the next stage side prevent rotation and side position of the side plate during levitating. A method for constructing a storage tank characterized by performing. 4. The assembly member used in the method for constructing a storage tank according to claim 1, wherein a flexible seal member detachably attached to a lower portion of an inner peripheral surface of a side plate to be levitated includes a lower end portion of the levitating side plate. It is formed of a side sealing film that prevents air from leaking from the gap, and the side sealing film is fixed to a fixing member at a predetermined height position on the inner peripheral surface of the side plate, and is fixed from the corner portion corresponding to the lower part of the storage tank to the inside corresponding to the bottom plate. Along with the length extension, the flexible seal member attached near the periphery of the bottom plate prevents air leakage from the gap between the bottom end of the side plate and the bottom plate of the next stage wrapped around the outer peripheral surface of the floating side plate. Bottom sealing film, which is fixed to a fixing member on the bottom plate at a position distant from the end of the side sealing film and overlaps with the upper part of the side sealing film from the corner part corresponding to the lower part of the storage tank to the side plate. Extends in the direction, and An assembling member used in a method for constructing a storage tank, characterized in that a holding plate having a different height of a holding portion to a side plate is provided on an upper surface of the bottom sealing film. 5. The assembling member used in the method for constructing a storage tank according to claim 3, wherein the equilibrium device is installed on a stand installed upright at a predetermined interval in the vicinity of the periphery of the bottom plate inside the storage tank. A plurality of upper and lower sheaves, a guide wire suspended radially from the sheaves, and a guide jig attached to the inner surface of a substantially ring-shaped side plate that is engaged with the guide wire and floats so as to rise uniformly. An assembly member for use in a method of constructing a storage tank, characterized in that 6. The assembly member used in the method for constructing a storage tank according to claim 3, wherein the levitation adjusting jig is the next-stage substantially ring-shaped member wound around the outer peripheral surface of the substantially ring-shaped side plate that floats. The lower bracket provided near the upper end of the outer peripheral surface of the side plate, the upper bracket provided facing the lower outer peripheral surface of the side plate located directly above the side plate to be levitated, and bridged between the upper bracket and the lower bracket for tightening. An assembly member for use in a method of constructing a storage tank, characterized in that the assembly member is formed with a levitation adjusting bolt.