JP2965982B1 - Reinforcement method for countermeasures against strong wind in cylindrical tank during construction - Google Patents

Abstract

When a plurality of wires are radially stretched as a countermeasure against a strong wind when constructing a cylindrical tank, work is hindered, and attachment / detachment of the wires is troublesome, thereby lowering work efficiency. SOLUTION: A temporary scaffold 10 is installed in a ring shape on the inner surface near the upper end of a constructed side plate 3 of a cylindrical tank in the course of construction to function as a strengthening ring, and a substantially middle portion of the constructed side plate 3 is provided. On the outer surface, the outer peripheral corridor / tension ring 20 provided on the outer surface of the upper end portion of the side plate 3 in the completed state of the cylindrical tank is provided.
Is tentatively assembled to reinforce the side plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method for preventing a strong wind in a cylindrical tank during construction, and more particularly, to a reinforcing method for reinforcing a cylindrical tank during the construction of a side plate of the cylindrical tank.

[0002]

2. Description of the Related Art Conventionally, when constructing a floating roof type cylindrical oil tank or a dome roof type flat bottom cylindrical tank, a bottom plate is first constructed in a circular shape, and side plates are sequentially formed on an annular plate on an outer peripheral portion of the bottom plate. To carry out construction such as welding and inspection. By the way, during the construction of the side plate, since the upper end side of the side plate is open and the roof has not been installed yet, there is a possibility that the cylindrical tank being constructed may be deformed or damaged by wind.

[0003] In particular, in the case of a large-diameter cylindrical tank, the wind receiving area is large and a large wind load is applied. Therefore, conventionally, as a reinforcing method for countermeasure against strong winds, a steel plate or the like is usually formed on the inner surface of the upper end of the side plate. A temporary ring is tentatively assembled and reinforced, and a plurality of wires connected to the upper end of the side plate are installed radially in a plan view outside and inside the cylindrical tank, and the lower ends of the wires are fixed to a fixed object (tank). (The base on the bottom plate side, the base of the breakwater outside the tank) to reinforce the cylindrical tank. For example, FIGS.
As shown in the figure, eight wires 100 are radially arranged outside the cylindrical tank being constructed, and the upper end of the wire 100 is connected to the side plate 101, and the lower end of the wire 100 is located near the base of the liquid barrier 101. Provisionally linked.

On the other hand, on the inner surface near the upper end of the side plate of the cylindrical tank being constructed, a plurality of temporary scaffold units having a circular arc shape in plan view are installed in a ring shape, and the temporary scaffold units are bolted together so as to be separable. A temporary scaffold is installed, and various works for building a side plate are performed using the temporary scaffold as a work floor. The temporary scaffold unit is detachably attached to the side plate of the cylindrical tank by hooking a plurality of upright frame members to a plurality of hook pieces fixed to the inner surface of the side plate, and the connection between the constructed side plate of the cylindrical tank and the temporary scaffold is established. Because it was not strong, it was difficult to use the ring-shaped temporary scaffolding as reinforcement for countermeasures against strong winds.

On the other hand, the upper end of the side plate of a floating roof type cylindrical tank or a dome roof type cylindrical tank is generally provided with an outer peripheral corridor and tension ring as a strong wheel for reinforcing the side plate structure of the tank. Conventionally, the outer peripheral corridor and tension ring are usually constructed at the intended installation location when the construction of the side plate structure of the cylindrical tank is almost completed. No effective use of the tension ring has been made.

[0006]

When only the temporary ring is used as a reinforcing method for countermeasures against strong winds, a very large temporary ring is required, and the material cost and the assembly cost are large. Therefore, a method of using a plurality of wires in combination with the temporary ring as described above is practical. But,
In some cases, multiple wires are stretched radially inside the cylindrical tank in a plan view.However, in the cylindrical tank, it is usual to stretch multiple wires outside the cylindrical tank due to the assembly of the roof. It is. In this case, the movement of the heavy equipment is restricted because heavy equipment such as a crane handling the side plate to be provided and a plurality of wires interfere with each other, so that the work of tank construction is supported, and the work efficiency of tank construction is reduced.
In addition, every time one side plate is assembled, it is necessary to remove the obstructing wire and reconnect it to another part, which lowers the work efficiency of tank construction.

It is an object of the present invention to provide a method for reinforcing a cylindrical tank in the middle of construction, which can be reinforced by effectively utilizing an outer corridor and tension ring and a temporary scaffold.

[0008]

According to a first aspect of the present invention, there is provided a reinforcing method for reinforcing a cylindrical tank for strong wind at a stage of constructing a side plate of the cylindrical tank during construction of a side plate of the cylindrical tank. In the completed state of the cylindrical tank, the outer peripheral corridor and tension ring provided on the outer surface of the upper end portion of the side plate of the cylindrical tank are temporarily attached to the outer surface of the substantially middle portion of the constructed side plate of the cylindrical tank. On the inner surface near the upper end of the constructed side plate,
The temporary scaffold is arranged in a ring shape, and a plurality of compression members are detachably mounted between the temporary scaffold and the side plate, so that the temporary scaffold functions as a strengthening wheel.

Since the outer peripheral corridor and tension ring originally has rigidity and strength functioning as a cylindrical tank tension ring, the outer peripheral corridor and tension ring is temporarily provided on the outer surface of the almost middle portion of the constructed side plate. By assembling, the strength and rigidity of the side plate of the cylindrical tank during construction can be significantly enhanced. In addition, the temporary scaffold also functions as a work floor when the worker works, paying attention to that it has sufficient strength and rigidity, on the inner surface near the upper end of the constructed side plate of the cylindrical tank,
Temporary scaffolds are arranged in a ring shape, and multiple compressed materials are detachably mounted between the temporary scaffolds and the side plates to make the temporary scaffolds function as strengthening wheels, greatly increasing the strength and rigidity of the side plates of the cylindrical tank being constructed. Can be strengthened.

According to a second aspect of the present invention, there is provided the reinforcing method for countermeasures against strong wind of a cylindrical tank during construction, wherein the outer peripheral corridor and the tension ring are boltably connected to each other at a plurality of locations in the circumferential direction. It is characterized by the following. Therefore, it is advantageous to separate the bolt connection at a plurality of positions in the circumferential direction of the outer peripheral corridor / tension ring, and to transfer the outer corridor / tension ring to an intended mounting position on the outer surface of the upper end portion of the side plate.

According to a third aspect of the present invention, in the reinforcing method for countering strong wind of a cylindrical tank being constructed, the temporary scaffold is bolted so that a plurality of arc-shaped temporary scaffold units can be separated. It is characterized in that it is. Therefore, the bolt connection of the plurality of arc-shaped temporary scaffold units can be released and the temporary scaffold can be moved upward in accordance with the progress of the rise of the side plate.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. A method for constructing a large-diameter dome-roof-type flat-bottomed cylindrical tank T will be described, and a reinforcing method for countermeasures against strong wind employed during construction of the cylindrical tank will be described. 1 to 3 show the first to third stages during the construction.
FIG. 4 shows the completed cylindrical tank T. FIG.

When the cylindrical tank T is constructed, after the foundation structure 1 is completed, a flat bottom plate 2 is first assembled on the foundation structure 1 and welded, and an inspection is performed. Next, as shown in FIG. 1, side plates 3 covering a plurality of stages are sequentially assembled into a cylindrical shape and welded to the outer peripheral portion of the bottom plate 2. In the first stage in which the height Hc of the constructed side plate 3 is about 1/3 or less of the design height H of the side plate 3, the wind receiving area of the cylindrical tank T receiving the wind is small, and the influence of the strong wind is not so large. The reinforcement for countermeasures against strong wind in the first stage is as follows. In some cases, a ring-shaped stiffener may be permanently provided on the inner surface or the outer surface of the side plate 3.

That is, as shown in FIG. 6, box-shaped brackets 5 are permanently welded to the outer surface of the lowermost ring-shaped side plate 3 at appropriate intervals in the circumferential direction. It is permanently connected to the base structure 1 by the anchor bolt 6. The bracket 5 and the anchor bolts 6 are not usually provided in a tank that is not likely to fall, but in the present embodiment, they are provided as reinforcement for countermeasures against strong winds regardless of whether or not there is a risk of falling. Furthermore, a temporary ring 7 made of a mold steel is temporarily attached to the inner surface of the upper end of the side plate 3 to reinforce the side plate 3 and to provide reinforcement for countermeasures against strong winds.
The temporary ring 7 is similar to the temporary ring 7 shown in FIG.

Next, as shown in FIG. 2, in parallel with the assembly of the side plate 3, a dome-shaped roof 9 is assembled on a gantry 8 temporarily installed on the bottom plate 2. Height H of the constructed side plate 3
In the second stage where c is at least about 1/3 and less than about 2/3 of the design height H of the side plate 3, a plurality of arc-shaped portions are formed on the inner surface near the upper end of the side plate 3 in order to construct the side plate 3. A temporary scaffold 10 formed by connecting the temporary scaffold units 10A in a ring shape is installed, and the work of assembling the side plates 3 is performed using the temporary scaffold 10 as a work floor.

As shown in FIG. 7, the temporary scaffolding unit 10
A is composed of a two-stage walkway member 11, a frame member 12, a tension rod 13 including a turnbuckle, etc., and an outer frame member 12a of the frame member 12 is formed of a hollow member, and a plurality of members welded to the side plate 3. Each temporary scaffold unit 10A is separably attached to the side plate 3 by locking the upper ends of the plurality of outer frame members 12a to L-shaped hook pieces (not shown).

Each of the arc-shaped temporary scaffolding units 10
A temporary arcuate scaffolding unit 10A circumferentially adjacent to A
Connecting part 14 with a plurality of high tension bolts 14a
And the temporary scaffold 10 is connected in a ring shape over the entire circumference of the cylindrical tank T, and is connected between the outer periphery of the temporary scaffold 10 and the inner surface of the side plate 3. At a suitable interval in the circumferential direction, a plurality of wooden wedge-shaped compression members 15 are detachably mounted, and the temporary scaffold 10 functions as a strengthening wheel to provide reinforcement for countermeasures against strong winds. However, this second
In the stage, as in the first stage, as shown in FIG. 7, as a reinforcement for countermeasures against strong wind, a temporary ring 7 is temporarily attached to the inner surface of the uppermost side plate 3 already constructed to reinforce the side plate 3. . Note that, instead of the wedge-shaped compression member 15, a hydraulic jack or the like provided in the temporary scaffold unit 10A can be applied.

Next, as shown in FIG. 3 and FIG. 5, in the third stage where the height Hc of the constructed side plate 3 becomes about 2/3 or more of the design height H of the side plate 3, the side plate 3 On the inner surface near the upper end, a temporary scaffold 10 is attached in the same manner as described above to provide reinforcement for countermeasures against strong winds, and the outer peripheral corridor and tension ring 20 provided on the outer surface of the upper end of the side plate 3 in the completed state of the cylindrical tank T, It is tentatively assembled to the outer surface of the almost middle portion of the constructed side plate 3 of the cylindrical tank T to provide reinforcement for countermeasures against strong winds. However, also in the third stage, similar to the first and second stages, as a reinforcement for countermeasures against strong winds, the same temporary ring 7 as the temporary ring 7 in FIGS. 2 and 7 is provided on the inner surface of the uppermost side plate 3 already constructed. The side plate 3 is reinforced by provisionally attaching the ring 7.

That is, as shown in FIG. 8, in the outer peripheral corridor / tension ring 20, a plurality of outer corridor / tension ring units 20A having an arc shape in plan view are arranged in a ring shape, and these are connected by a plurality of connecting portions 21. Connect in a separable manner. That is, in each connecting portion 21, the ends of the outer peripheral corridor / tension ring unit 20 </ b> A are bolted together with the connecting piece 22 and the plurality of bolts 23. Each of the outer peripheral corridor / tension ring units 20A includes an inner tension ring 24 abutting on the outer surface of the side plate 3, an outer tension ring 25 outside the inner tension ring 24, a corridor 26 with expanded metal, a frame member 27 and the like. It is configured.

Each of the outer peripheral corridor / tension ring units 20A is attached to the outer surface of the side plate 3 through a plurality of vertical rods 28, and a connecting piece 29 corresponding to each vertical rod 28 is temporarily welded to the outer surface of the side plate 3. Then, the upper end of each vertical rod 28 is bolted to the connecting piece 29, thereby temporarily attaching each outer peripheral corridor / tension ring unit 20A to the side plate 3. The outer peripheral corridor / tension ring 20 is originally designed to function as a tension ring for the cylindrical tank T, and has sufficient rigidity and strength.
Since it can be brought into close contact with the outer surface of the side plate 3, it sufficiently functions as reinforcement for countermeasures against strong winds. Note that the third one shown in FIGS.
At the stage, the lowermost annular plate 9a is welded to the outer peripheral portion of the dome-shaped roof 9 to remove the gantry 8, and a sealing material for floating the roof 9 by air pressure is prepared.

Next, as shown in FIG. 4, when the assembling of the side plate 3 is completed, the outer peripheral corridor and tension ring 20 is raised to a predetermined position at the upper end of the side plate 3 and assembled at a desired position. . In this case, the connecting portion 21 shown in FIG.
The bolts are separated from each other, and each outer corridor / tension ring unit 20A is moved upward with a crane or the like and fixed to a desired portion, and each outer corridor / tension ring unit 20A is welded to the side plate 3 and Connecting part 21
Is welded.

Next, with the space between the roof 9 and the side plate 3 sealed with a sealing material, the roof 9 inside the cylindrical tank T is closed.
The roof 9 is floated up to the position shown in FIG. 4 while filling the lower side with the pressurized air, and the roof 9 is welded to the upper end of the side plate 3. At the top of the roof 9, an access portion 9b for providing an access doorway is also formed.

In the reinforcing method for countermeasures against strong wind of the cylindrical tank T during construction described above, the second method of constructing the cylindrical tank T is described.
In the stage, the temporary scaffolding unit 10A functions as a strengthening wheel by a simple method of connecting the plurality of temporary scaffolding units 10A in a ring shape and mounting a plurality of compression members 15 between the temporary scaffolding 10 and the side plate 3. Since the side plate 3 of the cylindrical tank T is reinforced, there is no need to use a structural member dedicated for reinforcement, which is advantageous in terms of equipment costs. In addition, since the temporary scaffold 10 is used for reinforcement while being set inside the vicinity of the upper end of the constructed side plate 3, that is, while the temporary scaffold 10 is held at a position to be used as a scaffold, use of the temporary scaffold 10 is restricted. Not even.

As a countermeasure against strong wind, there is no need to extend a plurality of wires inside or outside the cylindrical tank being constructed, so that the movement of heavy equipment such as a crane and the movement of the vehicle are not saved, and the work efficiency of the cylindrical tank construction is reduced. Not even. And
The temporary scaffold 10 is effectively used to reinforce the cylindrical tank being constructed, which is advantageous in terms of equipment costs.
Can be reinforced while being used in a position where it is originally used, which is very advantageous also in terms of reinforcement construction cost.

In the third stage of the construction of the cylindrical tank T,
Similarly to the second stage, the temporary scaffold 10 functions as a strengthening ring to reinforce the side plate 3 of the cylindrical tank T, so that the same operation and effect as described above are achieved. Further, the outer peripheral corridor / tension ring 20, which is originally designed as a tension ring for the cylindrical tank T and has excellent rigidity and strength, is temporarily attached to the outer surface of the almost middle portion of the constructed side plate 3 so that the cylindrical tank T
, The strength and rigidity of the side plate 3 of the cylindrical tank T during construction can be significantly enhanced. In order to temporarily attach the outer peripheral corridor / tension ring 20 to the outer surface of the constructed side plate 3, finally, the outer peripheral corridor / tension ring 20 is moved upward, moved to an intended mounting position, and finally moved to the upper end of the side plate. It can be easily mounted permanently on a vehicle.

Since the outer peripheral corridor and tension ring 20 is separably bolted at a plurality of positions in the circumferential direction, the bolt connection of the connecting portions 21 of the outer peripheral corridor and tension ring 20 at a plurality of circumferential positions is separated. This is advantageous for relocating the outer peripheral corridor / tension ring 20 to the desired mounting position on the outer surface of the upper end of the side plate 3. The temporary scaffold 10
Is formed by connecting a plurality of arc-shaped temporary scaffolding units 10A in a separable manner with bolts.
And the temporary scaffold 10 can be moved upward.

Although the above embodiment has been described by taking as an example the case where the present invention is applied to the construction of a dome roof type flat bottom cylindrical tank T, various types of cylindrical tanks of other types such as a floating roof type cylindrical tank are used. The present invention can be similarly applied to construction.

[0028]

According to the first aspect of the present invention, in the completed state of the cylindrical tank, a rigid and strong outer peripheral corridor / tension ring provided on the outer surface of the upper end portion of the side plate of the cylindrical tank is attached to the built-up side plate of the cylindrical tank. By temporarily assembling it on the outer surface of the substantially middle portion, the strength and rigidity of the side plate of the cylindrical tank that is being constructed can be significantly enhanced. And on the inner surface near the upper end of the constructed side plate of the cylindrical tank,
Temporary scaffolding with sufficient strength and rigidity is arranged in a ring shape as a working floor when workers work, and multiple compressed materials are detachably mounted between the temporary scaffold and the side plate to make the temporary scaffold a strengthening wheel Since it is made to function, the strength and rigidity of the side plate of the cylindrical tank during construction can be greatly enhanced.

Since the outer peripheral corridor / tension ring is effectively utilized and reinforced, it is advantageous in terms of equipment cost, and the outer corridor / tension ring is temporarily attached to the outer surface of the constructed side plate. The perimeter corridor / tension ring can be moved upward, relocated to the desired mounting position and permanently attached to the upper end of the side plate. In addition, since the temporary scaffold is effectively used to reinforce the cylindrical tank being constructed, it is advantageous in terms of equipment costs, and it can be reinforced while using the temporary scaffold in the position where it was originally used,
It is also very advantageous in terms of reinforcement construction costs.

According to the second aspect of the present invention, since the outer peripheral corridor / tension ring is separably bolted at a plurality of locations in the circumferential direction, the outer peripheral corridor / tension ring is bolted at a plurality of circumferential locations. Thus, it is advantageous to relocate the outer peripheral corridor / tension ring to a desired mounting position on the outer surface of the upper end of the side plate. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, the temporary scaffold is formed by connecting a plurality of arc-shaped temporary scaffold units in a separable manner with a bolt. The temporary scaffold can be moved upward by releasing the bolt connection of the arc-shaped temporary scaffold unit. The other effects are the same as those of the first or second aspect.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a first-stage cylindrical tank during construction according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a second-stage cylindrical tank during construction.

FIG. 3 is a vertical sectional side view of a third-stage cylindrical tank during construction.

FIG. 4 is a vertical sectional side view of the completed cylindrical tank.

FIG. 5 is an enlarged view of a main part of FIG. 3;

FIG. 6 is a perspective view of a bottom plate, side plates, and anchor bolts.

FIG. 7 is a perspective view of a main part of a cylindrical tank and a temporary scaffold in a second stage.

FIG. 8 is a perspective view of a main part of the cylindrical tank and the outer peripheral corridor and tension ring in the third stage.

FIG. 9 is a plan view of a cylindrical tank, wires and the like during construction according to the related art.

10 is a side view of the cylindrical tank, wires, and the like in the middle of construction in FIG. 9;

[Explanation of symbols]

 T Cylindrical tank 3 Side plate 10 Temporary scaffolding 10A Temporary scaffolding unit 15 Compressed material 20 Outer corridor and tension ring

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Menya 8 Harima-cho, Harima-cho, Kako-gun, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Harima Plant (72) Inventor Mitsuhiro Miyazaki 8 Niijima, Harima-cho, Kako-gun, Hyogo (58) Investigated field (Int. Cl. ⁶ , DB name) E04H 7/06 B65D 88/06 E04G 3/00

Claims (3)

(57) [Claims] 1. A reinforcing method for reinforcing a cylindrical tank for countermeasure against a strong wind in a middle stage of constructing a side plate of a cylindrical tank, wherein an outer periphery provided on an outer surface of an upper end portion of a side plate of the cylindrical tank in a completed state of the cylindrical tank. A temporary corridor and tension ring is temporarily attached to the outer surface of the almost middle part of the constructed side plate of the cylindrical tank, and a temporary scaffold is arranged in a ring shape on the inner surface near the upper end of the constructed side plate of the cylindrical tank. A method of reinforcing a cylindrical tank in the middle of construction, in which a temporary scaffold functions as a strengthening wheel by detachably mounting a plurality of compression members between a scaffold and a side plate. 2. The method according to claim 1, wherein the outer peripheral corridor and tension ring are boltably connected at a plurality of positions in a circumferential direction so as to be separable. 3. The countermeasure against strong wind in a cylindrical tank during construction according to claim 1, wherein the temporary scaffold is formed by connecting a plurality of arc-shaped temporary scaffold units in a separable bolt manner. For reinforcement method.