JP2009228247A - Remodeling method for floating roof type storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remodeling method for a floating roof type storage tank, which makes the remodeling of the existing floating roof type storage tank performed with proper construction characteristics when the existing floating roof type storage tank is remodeled into a fixed roof type storage tank, which makes proper treatment applied to an existing floating roof after the formation of a fixed roof, and which makes a new floating roof properly formed after the treatment of the existing floating roof. <P>SOLUTION: In this remodeling method for the floating roof type storage tank, the fixed roof is formed on the upper section of the existing floating roof type storage tank. The remodeling method comprises a step of filling the floating roof type storage tank with water and lifting the floating roof so as to move it to the upper section of the floating roof type storage tank, and a step of forming the fixed roof on the floating roof by means of a lifting device and a supporting device formed on the floating roof so as to support a roof frame of the fixed roof. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for remodeling a floating roof storage tank in which a fixed roof is formed on top of an existing floating roof storage tank.

For example, in Patent Document 1, after the assembly of the side plate of the tank is completed, the floating roof assembled on the bottom plate in the tank side plate is levitated to a predetermined height by water filling, and scaffolds and struts temporarily installed on the floating roof An inner float tank roof assembling method comprising assembling a fixed roof using a support member is disclosed.

JP-A-60-198777

However, the roof assembly method for the inner float tank of Patent Document 1 is a new tank assembly method, and this Patent Document 1 describes a method for improving workability when remodeling from an existing floating roof storage tank to a fixed roof storage tank. Is not disclosed. Furthermore, the existing floating roof used for forming the fixed roof may not be necessary after the fixed roof is formed, and it is desired to remove this floating roof appropriately and to provide a new floating roof. Although there is a case, Patent Document 1 does not disclose this point.

The present invention has been made in view of the above points. The purpose of the present invention is to remodel a floating roof storage tank that can be remodeled with good workability when remodeling from an existing floating roof storage tank to a fixed roof storage tank. The object is to provide a method for remodeling a floating roof storage tank that appropriately handles an existing floating roof after the formation of the roof, and a method for remodeling a floating roof storage tank that appropriately forms a new floating roof after the existing floating roof treatment. .

The modification method of the floating roof storage tank of the invention according to claim 1 is a modification method of the floating roof storage tank in which a fixed roof is formed on the upper part of an existing floating roof storage tank, and the floating roof storage tank is filled with water, Using the lifting device and a supporting device formed on the floating roof to support the roof bone of the fixed roof. Forming the fixed roof above.

The method for remodeling the floating roof storage tank includes the steps of filling the floating roof storage tank, raising the floating roof and moving it to the upper part of the floating roof storage tank, and forming a lifting device and the floating roof on the floating roof storage tank. Forming the fixed roof on the floating roof using a support device for supporting the roof bone of the fixed roof, so that the fixed roof is formed on the raised floating roof. . Thus, this modification method of forming a fixed roof on the raised floating roof is supported by the floating roof at a high position by water, so that the fixed roof is formed on the floating roof positioned near the bottom plate. Compared with the conventional method of forming a fixed roof by raising the floating roof by forming a roof bone and then lifting the floating roof, the distance to suspend the member after lifting the member of the fixed roof with the lifting device and over the side plate, And the distance which moves the hook etc. of the lifting apparatus which lifted this member upwards after that can be shortened. For this reason, a fixed roof can be formed safely and easily compared with the conventional method. In addition, the construction period can be shortened. Thus, the remodeling method of this floating roof storage tank is a remodeling method that can be performed with good workability.

Moreover, in the remodeling method of the floating roof type storage tank of the invention according to claim 2, the step of draining water after the formation of the fixed roof and moving the floating roof to the vicinity of the bottom plate of the floating roof type storage tank; The step of taking out the dismantling member of the floating roof from the formed outlet is further provided.

The remodeling method of the floating roof type storage tank includes the steps of draining water after forming the fixed roof, moving the floating roof to the vicinity of the bottom plate of the floating roof type storage tank, and the floating roof from the outlet formed in the fixed roof. Therefore, the floating roof moved to the vicinity of the bottom plate can be disassembled, and the dismantling member dismantled from the floating roof can be extracted with good workability using the outlet. Since the take-out port is formed on the fixed roof, the take-out port can be formed large, and even if the dismantling member is large to some extent, it is allowed, so that the number of times the floating roof is cut and dismantled can be reduced. For this reason, the modification method of this floating roof type storage tank can remove the existing floating roof appropriately.

Moreover, in the remodeling method of the floating roof type storage tank of the invention according to claim 3, after disassembling the floating roof, a member of the newly formed floating roof is moved from the outlet and / or the manhole of the side plate of the floating roof type storage tank. The method further includes a step of carrying in the inside of the floating roof storage tank and assembling the members inside the floating roof storage tank to form a new floating roof.

In this floating roof storage tank remodeling method, after dismantling the floating roof, a newly formed floating roof member is carried into the floating roof storage tank from the outlet and / or a manhole on the side plate of the floating roof storage tank. And further comprising a step of assembling the members inside the floating roof storage tank to form a new floating roof. Easy to form. In particular, when a new floating roof member is carried into a floating roof storage tank from a manhole, the carrying of the member is simplified. On the other hand, when a new floating roof member is carried into the floating roof storage tank from the outlet, the member can be made larger and the number of times the floating roof is assembled (the number of weldings) can be reduced. Thus, the remodeling method of this floating roof type storage tank can appropriately form a new floating roof.

Note that the storage tank after the fixed roof is formed in the floating roof storage tank or after the floating roof is removed may not be a floating roof storage tank. In the description of the present invention, if such a storage tank is a floating roof type storage tank before the fixed roof is formed or the floating roof is removed, the storage tank may be expressed as a floating roof type storage tank. In the description of the present invention, a storage tank in which a new floating roof is constructed may be expressed as a fixed roof type storage tank.

As described above, according to the first aspect of the present invention, when the existing floating roof storage tank is remodeled to the fixed roof storage tank, this remodeling can be performed with good workability.

According to invention of Claim 2, the process of the existing floating roof after fixed roof formation can be performed appropriately.

According to invention of Claim 3, a new floating roof can be formed appropriately after the existing floating roof process.

Embodiments of the present invention will be described with reference to the drawings. In the drawings, the same, corresponding or generic items may be described with the same reference numerals. In the drawings, when there are a plurality of similar, corresponding, or generic items, only some of them may be described with reference numerals. The present invention is not limited only to the following embodiments. It goes without saying that changes (for example, omission or addition of components (members), change of shape of components, etc.) can be added to the following embodiments without departing from the gist of the present invention. It should be noted that welding or the like is used as appropriate in assembling and forming each member and the like as described below.

(Step 1) First, all the stored liquid stored in the floating roof storage tank 100 is drained (see FIG. 1). The floating roof type storage tank 100 includes a disk-shaped bottom plate 102, a cylindrical side plate 104 erected on the bottom plate 102, a floating roof 1 that floats on a stored liquid, and other facilities. The various facilities include a gauging home 116, a gauge pole (not shown), an air foam (not shown), a dam plate (not shown), a rain guard 108, a rolling ladder 112, a rail 114, a liquid level gauge (not shown). Etc.).

When the stored liquid is drained, the floating roof 1 of the floating roof storage tank 100 is supported by the floating roof support member such as the deck support 106 with an interval upward from the bottom plate 102. Thereby, the floating roof 1 is located in the baseplate 102 vicinity. The storage liquid is, for example, industrial water or seawater. The illustrated floating roof 1 is a single-deck type floating roof 1, and the floating roof 1 includes a deck plate 2 and an outer peripheral pontoon 3 positioned outside the deck plate 2 (that is, the outer peripheral portion of the floating roof 1). And having. The shape of the deck plate 2 is determined in accordance with the shape of the floating roof storage tank 100, and becomes a plate shape such as a disk shape, for example. The shape of the outer peripheral pontoon 3 is determined in accordance with the shape of the floating roof storage tank 100, and is, for example, an annular shape (not limited to an annular shape, including a polygonal annular shape). The floating roof 1 is a single deck type, but may be a double deck type or a pan type as another example.

(Step 2) Then, of the above facilities, the facilities unnecessary for the method of forming the fixed roof are removed. In FIG. 2 and subsequent figures, the deck support 106 is omitted as appropriate, but the floating roof support member such as the deck support 106 is left to be used for supporting when the floating roof 1 is lowered by installing a fixed roof. Further, in FIG. 2 and subsequent figures, the seal member 110 is omitted. However, if the seal member 110 is left, it can be used as a guide for lowering the floating roof when descending, and in addition, it is useful for preventing fall accidents.

(Step 3) Water is poured into the floating roof storage tank 100 to fill it, and the floating roof 1 is raised and moved to the upper part of the floating roof storage tank 100 (see FIG. 2). The above-mentioned industrial water or seawater may be used for water filling the floating roof storage tank 100. Industrial water and seawater are also water. When seawater is used, buoyancy increases and the floating roof 1 becomes more stable.

(Step 4) A supporting device and a work scaffold necessary for forming the fixed roof 30 are formed on the floating roof 1 (see FIG. 3). The support device is a device that supports the roof bone 7 and the like of the fixed roof 30, and includes, for example, a central support device 20 (that is, a temporary mount) formed in the center of the floating roof 1. The work scaffold (not shown) is a scaffold necessary for forming the fixed roof 30 and is formed on the outer peripheral pontoon 3, for example, but the outer peripheral pontoon 3 may be directly used as the work scaffold. Using such a working scaffold, the bracket 8 is formed on the upper portion of the side plate 104 (see FIG. 3). The bracket 8 connects the roof bone 7 of the fixed roof and the side plate 104. The bracket 8 can smoothly connect the roof bone 7 and the side plate 104.

(Step 5) Using the raised floating roof 1, the fixed roof 30 is suspended on the floating roof 1 using a lifting device 40 such as a crane and a supporting device such as the central supporting device 20. Form on top of.

Specifically, first, the roof bone 7 is formed using a lifting device 40, a supporting device such as the central supporting device 20, and a work scaffold. The member 43 of the roof bone 7 is lifted and carried by the lifting device 40. The roof bone 7 is formed by assembling the member 43 so as to be in a shape to be suspended between the central support device 20 and the bracket 8. The roof bone 7 has a shape extending in a plurality of directions and extending over the bracket 8 around the center of the floating roof storage tank. And the roof board 9 is installed on this roof bone 7 (refer FIG.3 and FIG.4). Thereby, the fixed roof 30 is formed in the upper part of the floating roof type storage tank 100 (refer FIG. 4).

In this way, in this modification method of forming the fixed roof 30 on the raised floating roof 1, since the floating roof 1 is supported at a high position by water, the floating roof 1 positioned in the vicinity of the bottom plate 102 is used. Compared to the conventional method of forming the fixed roof 30 by forming the roof bone 7 of the fixed roof 30 and then lifting the floating roof 1 to form the fixed roof 30, the member 43 of the fixed roof 30 is lifted using a lifting device. As shown by an arrow L, the distance to be hung after the side plate 104 is lifted and the distance to move the hook of the lifting device 40 that has lifted the member 43 upward can be shortened. For this reason, compared with the conventional method, the fixed roof 30 can be formed safely and easily. In addition, the construction period can be shortened, and the safety of falling objects is increased. Thus, the remodeling method of the floating roof type storage tank 100 is a remodeling method that can be performed with good workability.

Further, as described above, when the above-described support device or work scaffold is formed after the floating roof 1 is raised above the floating roof storage tank 100, that is, the necessary support device on the raised floating roof 1. Or, when forming a work scaffold, as described above, the support device itself, the work scaffold itself, or the distance to suspend these members, and the distance to move the hook of the lifting device 40 that has lifted this member upward thereafter. Can be shortened as shown by arrow L. For this reason, a support apparatus etc. can be formed safely and easily compared with the conventional method.

Further, the roundness of the upper edge of the side plate 104 is increased by water filling, and the fixed roof 30 can be constructed with high accuracy. Furthermore, the floating roof 1 can be effectively used for a portion that supports the support device and the work scaffold, and the existing floating roof 1 is effectively used for forming the fixed roof 30. Furthermore, since the floating roof 1 is supported by water, the load from the support device and the work scaffold can be received on an average over a wide area of the entire floating roof 1. For this reason, it is not necessary to reinforce the floating roof 1 as compared with the conventional method described above, or it can be reduced. In addition, since the floating roof 1 is supported by water, it is not necessary to provide a support device for supporting the floating roof 1 itself, so that the number of support devices and the like can be reduced compared to the conventional method. Moreover, according to this remodeling method of the floating roof storage tank 100, the existing floating roof storage tank 100 is modified to a fixed roof storage tank from the viewpoint of improving safety in response to an earthquake disaster or from the viewpoint of effective fire extinguishing equipment. To meet demand. Since the floating roof 1 is at a high position, it is easy to assemble the roof bone 7 by taking into account the amount of descent due to the load in advance by lifting the central portion of the fixed roof 30 slightly higher than the normal height.

(Step 6) After the fixed roof 30 is formed, the water is drained, and the floating roof 1 is moved to the vicinity of the bottom plate 102 (on the bottom plate 102) of the floating roof storage tank 100 (see FIG. 5). The floating roof 1 moved to the vicinity of the bottom plate 102 is supported by a floating roof support member such as a deck support 106 with an interval upward from the bottom plate 102 (see FIG. 6).

In addition, it is good to remove said support apparatus and a working scaffold before draining, especially after roof bone 7 formation. The support device and the work scaffold are removed by using the lifting device 40. If the support device and the work scaffold are removed at this time, the support device itself, the work scaffold itself, or a distance for lifting these members, and then the members are lifted. The distance by which the hook or the like of the lifting device 40 is moved downward can be shortened, and the support device and the work scaffold can be removed safely and easily.

(Step 7) The dismantling member 45 of the floating roof 1 is taken out from the outlet 35 formed in the fixed roof 30 (see FIG. 6). Specifically, an outlet 35 (roof opening) is formed in the fixed roof 30, the floating roof 1 is cut and disassembled, and the dismantling member 45 of the cut and dismantled floating roof 1 is removed from the outlet 35 using the lifting device 40. Lift and remove.

Since water is drained after the fixed roof 30 is formed, the floating roof 1 is moved to the vicinity of the bottom plate 102 of the floating roof storage tank 100, and the dismantling member 41 of the floating roof 1 is taken out from the outlet 35 formed in the fixed roof 30. The floating roof 1 moved to the vicinity can be dismantled, and the dismantling member 45 dismantling the floating roof 1 can be taken out using the outlet 35 with good workability. And since the taking-out port 35 is formed in the fixed roof 30, this taking-out port 35 can be formed large, and even if the dismantling member 45 is large to some extent, it is permissible, so the number of cutting and dismantling of the floating roof 1 can be reduced. For this reason, the modification method of the floating roof type storage tank 100 can appropriately remove the floating roof 1 used for forming the fixed roof 30. For this reason, the floating roof 1 can be disassembled, removed and removed with good workability. In particular, since the dismantling member 45 of the floating roof 1 that has been cut and dismantled is carried out and removed from the outlet 35 using the lifting device 40, it can be easily carried out and removed even if the dismantling member 45 is somewhat large.

In step 7 such as when the floating roof 1 is dismantled, if a small amount of water is placed on the bottom plate 102, the floating roof 1 can be cut and cured, and in addition, zinc can be used for surface protection. If a thin plate such as drawn steel is laid, the floating roof 1 can be cut, disassembled, and removed with good workability without damaging the surface of the bottom plate 102 and the coating lining. Furthermore, if the dismantling member 45 or the like is placed on the floating body using the stretched water and moved, the dismantling member 45 can be moved in the closed floating roof storage tank 100 which is difficult to carry and move. It can be done efficiently without depending on.

(Step 8) When a new floating roof 50 such as a simple floating roof is provided, the floating roof member 47 (see FIG. 7) and / or 49 (see FIG. 8) to be newly formed after the floating roof 1 is disassembled is taken out. 35 (see FIG. 7) and / or the manhole 60 (see FIG. 8) of the side plate 104 of the floating roof storage tank 100 is carried into the floating roof storage tank 100, and the members inside the floating roof storage tank 100 (see FIG. 7). And or 49 (refer FIG. 8) is assembled, and the new floating roof 50 is formed.

As the take-out port 35, the above-described take-out port can be used as it is, and the floating roof 50 can be easily formed. The manhole 60 is normally used at the time of construction or cleaning, and is formed in advance on the side plate 104 of the floating roof type storage tank 100.

The floating roof 50 includes, for example, a deck plate 51, a float 53 formed on the back surface of the deck plate 51, and a seal member 54 (shock absorbing material) formed outside the deck plate and between the side plates 104. When the stored liquid is not stored in the floating roof storage tank 100, the floating roof 50 is located in the vicinity of the bottom plate 102 and is spaced upward from the bottom plate 102 by a floating roof support member such as the deck support 52. Supported (see FIG. 7). The member 47 or 49 of the floating roof 50 is a lightweight roof material such as an aluminum material.

Even when a new floating roof 50 such as a simple floating roof is provided, a small amount of water for welding spark curing of the floating roof 50 is placed on the bottom plate 102, or galvanized steel is used for surface protection curing. Or lay a thin plate of. Thereby, the new floating roof 50 can be formed with good workability without damaging the surface of the bottom plate 102, the coating lining, and the like. Furthermore, if the member 47 or 49 or the like is placed on the floating body and moved using stretched water, the large heavy machinery relies on the movement of the member 47 or 49 in the closed storage tank that is difficult to carry in and move the large heavy machinery. It can be done efficiently. The floating roof 50 is a single type, but may be a pontoon type or a double deck type.

  After dismantling the floating roof 1, the members 47 and / or 49 of the newly formed floating roof 50 are taken into the floating roof storage tank 100 through the outlet 35 and / or the manhole 60 of the side plate 104 of the floating roof storage tank 100 and floated. Since the members 47 and 49 are assembled inside the roof-type storage tank 100 to form a new floating roof 50, the method for remodeling this floating roof-type storage tank can form the new floating roof 50 easily and simply. In particular, when the member 49 of the new floating roof 50 is carried into the floating roof storage tank 100 from the manhole located at the low position as shown in FIG. On the other hand, when the member 47 of the new floating roof 50 is carried into the floating roof storage tank 100 from the outlet 35, the member 47 can be enlarged, and the number of times the floating roof 50 is assembled (the number of weldings) can be reduced. In any case, this floating roof storage tank remodeling method can appropriately form a new floating roof 50.

The method for remodeling a floating roof storage tank according to the present invention can be widely applied when an existing floating roof storage tank is remodeled into a fixed roof storage tank using a floating roof and water filling.

It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which extracted the storage liquid of the storage tank. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which inject | pours water into a floating roof type storage tank and water-fills and raises a floating roof following FIG. . It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which forms a fixed roof following FIG. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state after fixed roof formation following FIG. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which drains water from a floating roof type storage tank and descends a floating roof following FIG. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which dismantles and removes a floating roof following FIG. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which forms a new floating roof using an extraction port following FIG. It is explanatory drawing explaining an example of the remodeling method of the floating roof type storage tank which concerns on this invention, and is explanatory drawing which shows the state which forms a new floating roof using a manhole following FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floating roof 2 Deck board 3 Outer peripheral pontoon 7 Roof bone 8 Bracket 9 Roof board 20 Central support apparatus 30 Fixed roof 35 Exit 40 Lifting apparatus 43 Member 45 Demolition member 47 Member 49 Member 50 Floating roof 51 Deck board 52 Deck support 53 Floating 54 Seal member 60 Manhole 100 Floating roof storage tank 102 Bottom plate 104 Side plate 108 Rain shield 110 Seal member 112 Rolling ladder 114 Rail 116 Gauging home

Claims (3)

A method of remodeling a floating roof storage tank that forms a fixed roof on the upper part of an existing floating roof storage tank, which is filled with the floating roof storage tank, and then lifts the floating roof and moves to the upper part of the floating roof storage tank And forming the fixed roof on the floating roof using a lifting device and a support device formed on the floating roof and supporting the roof bone of the fixed roof. Remodeling method of floating roof storage tank. In the remodeling method of the floating roof type storage tank according to claim 1, water is drained after the formation of the fixed roof, and the floating roof is moved to the vicinity of the bottom plate of the floating roof type storage tank, and the outlet formed in the fixed roof A step of removing the dismantling member of the floating roof from the above, and a method for remodeling the floating roof storage tank. The remodeling method of the floating roof storage tank of Claim 2 WHEREIN: After the dismantling of the said floating roof, the member of the newly formed floating roof is the said floating roof storage tank from the said exit and the manhole of the side plate of the said floating roof storage tank. A method for remodeling a floating roof storage tank, further comprising a step of bringing the member into the interior of the floating roof storage tank and assembling the members inside the floating roof storage tank to form a new floating roof.

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