JP4904927B2 - Renewal method of storage tank side plate - Google Patents

Description

The present invention relates to a method for renewing a storage tank side plate for safe dismantling with good workability when a working place around a storage tank is narrow and safety aspects such as handling of fire are severely restricted.

  When a large storage tank having a cylindrical steel side plate peripheral wall is aged for a long time after construction, it needs to be repaired for safety. In addition, there is a need to update the side plate part or the whole by changing the use of the storage tank or changing the location conditions.

When repairing a conventional general cylindrical storage tank, although not shown in the figure, first, a total scaffolding is temporarily installed on the entire outer periphery of the side wall of the cylindrical storage tank, and an operator cuts the side wall of the side panel by gas cutting or the like on the scaffold. The blocked side plates are lifted and lowered by heavy machinery such as cranes, and repair work is carried out sequentially from the height toward the bottom. Thus, the method of repairing from the high place to the lower part using the heavy equipment requires a wide working place where the heavy equipment moves around the storage tank. In particular, in places where there are storage tanks and operating facilities for storing dangerous materials in the surroundings, work places where heavy machinery is used are limited, and large-scale and strict safety measures such as measures against fire scattering are also required.

As a conventional technique in consideration of workability and safety, for example, there is an invention of “a method for assembling a peripheral wall of a cylindrical tank” of Japanese Patent Publication No. 2-333821 by the present applicant. In this invention, the lowermost peripheral wall is first assembled, a roller is arranged at the upper edge, and the upper peripheral wall is piled up using a crane and a working scaffold in a limited fixed place while rotating the peripheral wall with this roller. It is a construction method that goes.

Japanese Patent Laid-Open No. 8-270226 “Tank Side Plate Replacement Method” is a side plate lifting method in which a reinforcing ring is horizontally attached to the inner surface of a storage tank and fixed with members such as a longitudinal member and a hose shoe. A side plate is cut from the lower stage sequentially with a winch using a jig and replaced.

Also, the invention of Japanese Patent Laid-Open No. 10-148044 “A method for constructing a double shell tank and a side plate mounting device used in the same method” has a side plate mounting device attached to the upper edge of the uppermost side plate and a suspension hoist mounted on a hoist rail. The side plate is constructed by attaching

Furthermore, the invention of the "disassembly repairing method of the upper part of the circumferential wall of the cylindrical storage tank" disclosed in Japanese Patent Application Laid-Open No. 10-61246 by the present applicant cuts the peripheral wall of the upper part of the storage tank horizontally, and arranges the rollers at a predetermined interval. This is a method of cutting, dismantling and repairing the upper part while rotating, and the invention of Japanese Patent Application No. 2005-277263 “Rotating Dismantling Method of Storage Tank” by the present applicant is not required to require a large temporary scaffold. It is a construction method that dismantles sequentially downward while rotating the storage tank with the dismantling work platform at the location and the rollers installed all around the side plate.

JP-B-2-33821 JP-A-8-270226 Japanese Patent Laid-Open No. 10-148044 JP-A-10-61246 Japanese Patent Application No. 2005-277263

Conventional storage tank repair methods require a large work area where large heavy machinery such as cranes move around the entire circumference of the storage tank, and the surroundings are surrounded by a liquid barrier and are used to store dangerous materials. In places where there are storage tanks and operating equipment, the work place was restricted. Also, large-scale and strict safety measures such as ground curing due to the movement of heavy machinery and lifting and descent and measures against fire scattering were required.

The invention disclosed in Japanese Patent Publication No. 2-33381 by the applicant of the present invention discloses a method for assembling a peripheral wall of a cylindrical tank. Although it is an assembly method with excellent safety and work efficiency, it is necessary to install a large crane and work platform, and it is suitable for building up new storage tanks from the bottom, but it is suitable for construction. It is not a suitable method for repairing storage tanks from above and below.

The invention of Japanese Patent Application Laid-Open No. 8-270226, “Tank Side Plate Replacement Method” is a method of repairing with good work efficiency without the need to provide a huge temporary scaffold, etc. Since the transfer is complicated and requires a long longitudinal member along the upper and lower sides of the side plate, it is not suitable for a large storage tank.

In addition, the invention of Japanese Patent Application Laid-Open No. 10-180444 “A method for constructing a double shell tank and a side plate mounting device used in the method” constructs a side plate between the inner and outer tanks of the double shell tank using the upper edge of the side plate. However, this method was not suitable for the restoration of the existing single-shell storage tank side plate.

Furthermore, the invention disclosed in Japanese Patent Application Laid-Open No. 10-61246 by the applicant of the present invention discloses a peripheral wall of a large floating roof type cylindrical storage tank to which a wind girder is attached. This is a method suitable for dismantling and repairing the upper part, and can be dismantled and repaired at a predetermined place safely and efficiently while rotating the upper part of the peripheral wall of the storage tank. Japanese Patent Application No. 2005-277263 by the present applicant The invention of the “rotary dismantling method of storage tank” is to dismantle the storage tank side plate sequentially downward with good workability while rotating the storage tank side plate by a dismantling work platform at a predetermined location and a roller installed all around. None of the rotating construction methods using the rollers according to the method were suitable for exchanging the lower part and the upper part together by leaving the middle part of the side plate.

The object of the present invention was made in view of the problems of the prior art as described above, and when replacing the side plate of the storage tank over the lower part and the upper part, the periphery of the storage tank is so narrow that heavy machinery does not enter and workability is not good. In this case, a method for renewing a side plate that is excellent in safety and workability is provided.

The method for renewing the storage tank side plate according to claim 1 is that a heavy machine for lifting and transporting is installed in a predetermined area of the cylindrical storage tank where the side plate is replaced, and the lower side plate such as the first and second stages at the bottom is two stages. Side plate replacement by rail lift method that sequentially transports side plates of a predetermined length with a chain block with a trolley that runs along a rail attached horizontally in the outer circumferential direction of the side plate at the bottom of the middle position or the side plate at the middle position A plurality of side plates from the middle to the upper part of the cylindrical storage tank are cut out over the entire lower edge of the second side of the existing side plate, a protector is installed horizontally, and a roller and a drive that are driven to rotate by the protector are driven. A cylindrical storage tank is installed by a revolver method in which a roller member equipped with a roller is installed at the upper end of the first side plate at the first stage at intervals, and the upper cylindrical side plate is rotated completely from the middle by the roller member. Sequentially replacing the side plates and from the upper to the middle, the conveyance of the plate is intended to replace and transport Lifting using the heavy equipment.

The renewal construction method of the storage tank side plate according to claim 2 , wherein the replacement of the low side plate is performed by a chain block with a trolley that runs along a rail attached horizontally in the outer circumferential direction of the side plate . the chain block as a heavy equipment alternatives have row at row cormorants rail lifting method the loading of the unloading and new plates already side where plate, then replacement of the side plates of the plurality of stages of upward from the intermediate is guided into the protector The roller plate that is driven to rotate rotates the side plates of the upper plurality of stages from the middle of the cylindrical storage tank, and makes one round replacement of the uppermost side plate of the cylindrical storage tank . Then, the roller member from the middle of the cylindrical storage tank after that is similar to one rotation of the side plates of the upper plurality of stages was replaced around the al side plate, carried by sequentially revolver construction method of side plates each stage Ru replacement downward, finally taken to the second stage existing plate And performs trolley with chain blocks attached horizontally mounted in the outer circumferential direction of the intermediate position the bottom of the side plate, at the second stage of the existing plate and rail lift method to replace crowded difference new plate to remove roller gear is there.

The method for renewing the storage tank side plate according to claim 1 is that a heavy machine for lifting and transporting is installed in a predetermined area of the cylindrical storage tank where the side plate is replaced, and the lower side plate such as the first and second stages at the bottom is two stages. Side plate replacement by rail lift method that sequentially transports side plates of a predetermined length with a chain block with a trolley that runs along a rail attached horizontally in the outer circumferential direction of the side plate at the bottom of the middle position or the side plate at the middle position A plurality of side plates from the middle to the upper part of the cylindrical storage tank are cut out over the entire lower edge of the second side of the existing side plate, a protector is installed horizontally, and a roller and a drive that are driven to rotate by the protector are driven. A cylindrical storage tank is installed by a revolver method in which a roller member equipped with a roller is installed at the upper end of the first side plate at the first stage at intervals, and the upper cylindrical side plate is rotated completely from the middle by the roller member. Sequentially replacing the side plates and from the upper to the intermediate, since replacement of the transport side plates and conveyed Lifting using the heavy equipment,
Even when the surroundings of the storage tank are narrow and workability is not good, renewal construction can be performed using simple rail lift equipment, roller equipment, and heavy equipment at a predetermined position without requiring large-scale movement of heavy equipment. In addition, when there is an operating storage tank or equipment nearby, lifting and transporting is performed using heavy equipment at a predetermined position, so it is necessary to take measures such as ground curing and fall scattering prevention due to heavy equipment movement and suspension transportation. The update can be done safely without any problems.

The renewal construction method of the storage tank side plate according to claim 2 , wherein the replacement of the low side plate is performed by a chain block with a trolley that runs along a rail attached horizontally in the outer circumferential direction of the side plate . the chain block as a heavy equipment alternatives have row at row cormorants rail lifting method the loading of the unloading and new plates already side where plate, then replacement of the side plates of the plurality of stages of upward from the intermediate is guided into the protector The roller plate that is driven to rotate rotates the side plates of the upper plurality of stages from the middle of the cylindrical storage tank, and makes one round replacement of the uppermost side plate of the cylindrical storage tank . Then, the roller member from the middle of the cylindrical storage tank after that is similar to one rotation of the side plates of the upper plurality of stages was replaced around the al side plate, carried by sequentially revolver construction method of side plates each stage Ru replacement downward, finally taken to the second stage existing plate Since the trolley with chain blocks attached horizontally mounted in the outer circumferential direction of the intermediate position the bottom of the plate is carried out at the second stage of the existing plate and rail lift method to replace crowded difference new plate to remove roller gear,
Without requiring the installation of a large heavy machine that moves around the storage tank in a wide range, after the lower side plate is replaced, the replacement can be performed sequentially from the upper side plate with good workability. In addition, work using heavy machinery is performed safely within a predetermined area, and the storage tank renewal work proceeds in sequence by the low position and the movement from the upper stage to the lower stage due to rotation. It can be constructed well.

The outline of the procedure which combined the renewal construction method of the storage tank side plate concerning this invention, a rail lift construction method, and a revolver construction method is shown to items 1-8. 1. Disconnect connection pipes and accessories from storage tanks and cut edges. The piping and accessories connected to the periphery of the storage tank are cut off to make the storage tank rotatable. 2. A rail member used in the rail lift method, a chain block with a trolley, and the like are installed at a predetermined position above the second stage of the side plate. (Preparation of rail lift method) 3. The first step of the side plate is updated by the rail lift method. (Construction of rail lift method) The predetermined width of the first stage of the existing side plate is cut and carried out, and then the first stage of the new side plate is carried in and welded. Sequentially repeat in the circumferential direction. The above-mentioned chain block with a trolley or the like is used for carrying out and carrying in. 4). The second stage of the existing side plate is cut out, and a protector for rotation and a roller member used in the revolver method are installed. (Preparation of the revolver method) The protector is installed horizontally over the entire circumference of the lower edge of the second stage of the existing side plate, and the roller member is set at a predetermined position on the upper edge of the first stage of the new side plate. 5. While rotating with a roller, the revolver method is used to update the third step of the side plate in sequence from the uppermost part of the side plate to the entire lower part. (Construction of revolver method) A heavy machine is installed in a predetermined work area and lifted and moved at a predetermined position. 6). Update the second stage of the side plate using the rail lift method. (Construction of the rail lift method) The predetermined width of the second stage of the existing side plate is cut, and the protector for rotation and the roller member are also removed and carried out. Next, a new second side plate is carried in and welded. Sequentially repeat in the circumferential direction. A rail member, a chain block with a trolley, etc. are used for carrying out a side plate and transferring it in. 7). Remove the rail member and chain block with trolley. 8). Restore the edge cut of the piping and other accessories.

An embodiment of a rotation renewal construction method for a storage tank side plate according to the present invention will be described with reference to FIGS. FIG. 1 is an overall explanatory view showing a state where the first side plate at the lowest stage is replaced by a rail lifting conveyance method, that is, a rail lift method, and FIG. 2 is a diagram showing a vertical cross-sectional state of the rail lift method of FIG. It is. FIG. 3A is a front view in which a roller and a protector are installed by hollowing out the second stage of the existing side plate at the upper end of the first stage of the newly updated side plate, and FIG. 3B shows a longitudinal section thereof. FIG. 4 is an overall explanatory view showing a state in which the upper side plate of the storage tank is replaced by the full rotation method, that is, the revolver method. FIG. 5 is a longitudinal sectional view showing a state in which the roller and the protector at the upper end of the first step of the side plate are removed and the second step of the side plate is replaced by the rail lift method. FIG. 6 is a plan layout view around the storage tank.

As shown by hatching in FIG. 6, the cylindrical storage tank 1 that performs the renewal construction is surrounded by the existing storage tank and the liquid barrier 24 on the three sides, and the front faces the passage 25. In such a place where the periphery is narrow, it is difficult to move the heavy machinery over the entire periphery of the storage tank and perform the work of hanging, loading and unloading. Therefore, the front passage 25 is used as a work area 26, and this limited work area 2 is used.
A large heavy machine such as a crane is installed in 6 to perform lifting and loading / unloading work.

As shown in FIG. 1, the passage 25 of the storage tank 1 is used as a work area 26, and a heavy machine 27 is installed in the predetermined work area to carry the updated side plate pieces. Around the side plate 3 of the storage tank 1, around a predetermined height position, for example, the side plate 2 or n-th stage in the circumferential direction where the rail 4 for transportation is installed in the horizontal direction and the heavy equipment 27 cannot be used. The lower side plate such as the first step of the lowermost side plate is lifted and transferred using this rail 4. In this way, the lower side plate such as the first step of the side plate is sequentially carried out and carried in the circumferential direction by the rail lift method using the rails 4 and is updated.

As shown in FIG. 2, a rail 4 used in the rail lift method is installed on the n-th position of the side plate, for example, the wall surface of the second step 3-2 of the side plate, and a chain block 7 with a trolley for lifting is attached to the rail 4. Suspend. The rail 4 is made to be continuous in the circumferential direction using, for example, I-shaped steel, and the mounting member 6 and the bracket 7 of the rail 4 are isolated using a formed steel material, and a plurality are fixed to the side plate surface. A plurality of chain blocks 7 with trolleys are suspended on the rail 4 and the single piece of the side plate first stage 3-1 that has been cut and removed is lifted and carried out, and then the single piece of the new side plate first stage 3-1 is lifted up. Carry in and install at the removed position.

In order to carry out the revolver method, as shown in FIGS. 3a and 3b, the upper part of the peripheral wall of the newly installed side plate 1st stage 3-1 and the existing side plate 2nd stage 3-2 are hollowed out and the number of pitches from 1 meter to several A plurality of openings 9 are cut out at appropriate positions separated by about a meter along the circumferential direction, and a rotating roller 10 is installed in the openings 9. Moreover, the drive roller 11 which rotates electrically and sends out is installed in a required number of suitable places. Reference numeral 12 denotes a gantry and 13 denotes a load support bracket.

As shown in FIG. 3a, the lower end edge of the existing side plate second stage 3-2 is cut horizontally, and the protector 14 for rotation is fixed along the circumferential direction. The protectors 14 are guided by the rollers 10 and 11, and installed so that the upper side plate 3 rotates smoothly and horizontally. Moreover, as shown in FIG. 3b, between the inner bottom plates of the first side plate 3-1 of the new side plate, an inclined material support 15 made of a formed steel material is installed to stabilize and support the side plate 3 vertically. . After the above preparation, it is confirmed that the upper side plate and the accessory make a single horizontal and smooth rotation without contacting the inner and outer members.

As shown in FIG. 4, a heavy machine 27 such as a crane is installed in the work area 26 of the passage 25, and the side plates 3 are rotated horizontally by the revolver method using the rollers 10 and 11 provided as described above. After the update work for the upper N stage of the side plate is completed and the update is completed over one round, the side plate is sequentially moved to the lower side plate and further updated for one round. Continue the update work of 3.

Thus, since the heavy machinery 27 is installed in the work area 26 at a predetermined position and the replacement member is sequentially carried in and out while rotating the storage tank, the work becomes easy. The replacement of the upper side plate proceeds sequentially from the upper side to the lower side, so that it is excellent in safety, has good workability, and can be updated efficiently in a short time.

As shown in FIG. 5, the removal of the rollers 10 and 11 used in the revolver method and the renewal of the existing side plate second stage 3-2 are performed on the side plate n stage position, for example, the side plate third stage 3-3 wall surface. The rail 4 and the chain block 7 with the trolley are carried out and used for carrying in by the rail lift method.

As mentioned above, when the surroundings of the storage tank to be renewed are narrow and workability is poor, or when there are storage tanks or equipment in operation in the surrounding area, a simple rail lift is required without requiring heavy equipment to move around. The side plate can be stably updated by using the member, the roller rotating member, and the heavy machine at a predetermined position. In addition, work using heavy machinery is performed in a predetermined area that is wide and suitable for transport, so there is no fire or cuts scattered around the entire circumference of the storage tank, and temporary materials such as large flameproof sheets and curing materials are reduced. It is possible to perform the update work with good workability with safety work.

The rotary dismantling method of the storage tank according to the present invention is simple because it can be easily and safely performed in limited repair work such as various structures with a narrow and limited place and dangerous objects in the vicinity. It can be applied when renewal construction is performed by installing rail members, roller members, and heavy machinery.

It is a whole explanatory view showing the situation where the lowermost 1st stage side board of a storage tank is replaced by the rail lift method concerning this invention. It is a longitudinal cross-sectional view which shows the implementation condition of the rail lift method of FIG. It is the front view which cut out the existing 2nd step of the side plate on the 1st step of the newly updated side plate, and installed the roller and the protector. FIG. 3b is a longitudinal sectional view of FIG. 3a. It is whole explanatory drawing which shows the condition which has replaced the upper side plate of the storage tank by the revolver construction method. It is a longitudinal cross-sectional view which shows the condition which removes a roller and a protector by the rail lift construction method, and has replaced the 2nd step | paragraph of the side plate. It is a top view which shows the arrangement | positioning state of the storage tank to dismantle.

Explanation of symbols

1 Storage tank
2 Roof
3 Side plate
3-1 Side plate 1st stage
3-2 Second stage of side plate
3-N Side plate Nth stage
4 rails
5 Mounting base
6 Bracket
7 Chain block with trolley
8 Bottom plate
9 Cutting opening
10 Rotating roller
11 Drive roller
12 frame
13 Bracket
14 Protector
15 Inclined material support
24 Breakwater
25 passage
26 work area
27 Heavy machinery

Claims (2)

A heavy machine for lifting and transporting is installed in a predetermined area of the cylindrical storage tank where the side plate is replaced. The lower side plate such as the first and second tiers is the outer circle of the second tier side plate or the lowest middle tier side plate. The side plate is replaced by a rail lift method that sequentially conveys a side plate of a predetermined length with a chain block with a trolley that runs along a rail mounted horizontally in the circumferential direction.
The plurality of side plates from the middle to the upper side of the cylindrical storage tank are provided with a roller and a driving roller that are notched over the entire circumference of the lower edge of the second step of the existing side plate and are horizontally driven by the protector. A roller member is installed at the upper end of the new side plate at the first stage at intervals, and the side plate is sequentially moved from the upper stage to the middle of the cylindrical storage tank by the revolver method in which the cylindrical side plate is rotated from the middle to the upper side with the roller member. The method for renewing the storage tank side plate is characterized in that the side plate is lifted and transferred using the above heavy machinery. The low position replacement of the side plates of performed outside circumferential trolley with chain block traveling along the horizontal mounting rails of the side plates, out of the already side where plate the trolley with the chain block the heavy equipment alternatives and have a row at row cormorant rail lift method the loading of the new side plates,
Next, the plurality of side plates from the middle to the upper side are replaced by rotating the plurality of side plates from the middle to the upper side of the cylindrical storage tank by a roller member that is guided by the protector to rotate. perform replacement round of the upper plate, and then after such by one rotation of the side plate of the plurality of stages of upward from the middle of the cylindrical reservoir by the roller member has been replaced around the al side plate, toward the turn plate each stage downward be made in Ru replaced Te revolver method,
Finally, attach the chain block with trolley attached to the second step of the existing side plate horizontally in the outer circumferential direction of the side plate at the bottom of the middle position , remove the existing second side plate and roller equipment and replace the new side plate. The method for renewing a storage tank side plate according to claim 1, wherein the method is performed by a rail lift method .

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