JP6650918B2 - Dismantling method of floating roof type circular tank - Google Patents

Description

  The present invention relates to a method for dismantling a floating roof type circular tank, and more particularly to a method for dismantling a floating roof type circular tank which can be easily and quickly disassembled without using a large crane. is there.

  An example of a method for dismantling a circular tank is disclosed in Patent Document 1. Hereinafter, the dismantling method of the circular tank is referred to as a conventional dismantling method, which will be described with reference to the drawings.

  10A and 10B are explanatory views showing a conventional disassembly method. FIG. 10A is a front view showing a state in which a cut portion is formed on the tank side wall, and FIG. 10B is a state in which rollers are installed in the tank turning means and the cut portion. FIG. 11C is a front view showing a state in which the tank is turned after removing the cut pieces, and FIG. 11 is an enlarged view of a portion A in FIG. 10B.

  In FIG. 10, 21 is a circular tank, 22 is a side wall of the tank 21, 23 is a saw-tooth-shaped cut portion formed on the side wall 22, and 24 is a tank that pivots around the central axis of the tank 21. It is a turning means.

  The turning means 24 includes a wire 25 wound around the side wall of the tank 21 and a jack 26 for pulling the wire 25. Reference numeral 27 denotes a roller provided in the cutting section 23.

  According to the conventional dismantling method, the tank is dismantled as follows.

  First, as shown in FIG. 10A, a cut portion 23 is formed in the side wall 22 of the tank 21 by fusing the side wall 22 so as to have a saw-tooth shape.

  Next, as shown in FIG. 10B, a turning means 24 for turning the tank 21 around the center axis of the tank 21 is provided on the side wall 22 of the tank 21. Further, after slightly lifting the upper part of the tank 21 with a jack or the like, as shown in FIG.

  Next, as shown in FIG. 10C, a part of the side wall 22 of the tank 21 is cut, and after removing the cut piece 22a, the tank 21 is turned by the turning means 24 via the roller 27 by the cut piece 22a. Then, similarly, the next part of the side wall 22 is cut, and the cut piece 22a is removed. By repeatedly performing this operation, the tank 21 is disassembled.

JP-A-62-185965 JP-A-10-59691

  According to the above conventional dismantling method, the circular tank can be dismantled without using a large crane, but has the following problems.

(1) When installing the rollers 27, the tank 21 itself needs to be lifted, and the installation of the rollers 27 requires time and effort.
(2) The cutting of the side wall 22 of the tank 21 can be performed at a low place, but since the cutting of the side wall 22 and the turning of the tank 21 need to be performed alternately and repeatedly, disassembling the tank 21 requires time and labor. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for dismantling a floating roof type circular tank which can be easily and quickly disassembled without using a large crane.

  The present invention has been made to achieve the above object, and has the following features.

The invention according to claim 1 is a floating roof type circular tank comprising: a cylindrical side wall constructed on a bottom plate; and a floating roof provided at the top of the side wall and capable of moving up and down along the side wall. In the disassembly method of the following,
(A) providing a plurality of openings in the side wall at intervals in a circumferential direction of the side wall;
(B) lowering the floating roof and seating on the bottom plate;
(C) a step of cutting the floating roof, carrying out the cut roof piece out of the tank through the opening, and removing the roof piece;
(D) attaching a reinforcing material inside the side wall portion to be removed;
(E) installing a rail on the bottom plate between the center of the tank and the opening.
(F) connecting the lower part of the reinforcing member and the rail via a fixed hinge.
(G) installing a truck and side wall pulling means on the rail;
(H) connecting the cart and the reinforcing member via a movable hinge by a side wall supporting member;
(I) a cutting step of cutting the side wall portion to be removed and separating the side wall portion from the side wall;
(J) The carriage is moved toward the center of the tank along the rail by the side wall pulling means, and the side wall portion is placed inside the tank via the side wall support member with the lower portion of the reinforcing member as a fulcrum. The process of pulling down.
(K) a step of cutting the side wall portion, carrying out the cut side wall piece out of the tank, and removing it.
And characterized in that the steps (d) to (k) are repeated.

  According to a second aspect of the present invention, in the first aspect of the invention, the side wall pulling means comprises a pulling side wire jacking device and a payout side wire jacking device. The wire passed between the feeding-side wire jacking device is fixed to the carriage.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1, the side wall pulling-down means comprises a hydraulic jack device, and a rod of the hydraulic jack device is fixed to the bogie. Have

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the step (i) includes an operation of cutting a lower corner portion of the side wall portion into an arc shape. It has features.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the step (i) includes an operation of stretching a side wall overturn preventing material between the side wall and the bottom plate. It is characterized by including.

  The invention described in claim 6 is characterized in that, in the invention described in any one of claims 1 to 4, the number of the openings is eight.

  According to the present invention, the floating roof type circular tank can be easily and quickly disassembled without using a large crane.

  Further, according to the present invention, when the side wall portion to be removed is cut off and cut off from the side wall, the lower corner portion of the side wall portion is cut in an arc shape, so that the interference portion with the bottom plate is eliminated, so that the side wall portion is removed. Can be pulled down smoothly.

  Further, according to the present invention, when the side wall portion to be removed is cut and cut off from the side wall, the side wall overturn prevention member is stretched between the side wall and the bottom plate, whereby the side wall on both sides of the removed side wall portion is overturned. Can be prevented.

It is a figure which shows the process of providing an opening in a side wall and seating a floating roof on a bottom plate by the disassembly method of a floating roof type circular tank of this invention, (a) is a top view, (b) It is sectional drawing. It is a figure which shows the process of carrying out and removing a floating roof out of a tank by the disassembly method of a floating roof type circular tank of this invention, (a) is a top view, (b) is sectional drawing. It is. According to the method for dismantling a floating roof type circular tank of the present invention, a reinforcing member is attached to the inside of a side wall portion to be removed, a rail is installed on a bottom plate between a center portion of the tank and an opening, and a lower portion of the reinforcing member and a rail are provided. FIG. 7A is a view showing a step of connecting a vehicle and a reinforcing member to a rail via a movable hinge by connecting the vehicle and a reinforcing member to the rail via a fixed hinge, Is a plan view, and (b) is a sectional view. It is a figure which shows the process which isolate | separates the side wall part removed from the side wall by the disassembly method of the floating roof type circular tank of this invention, (a) is a top view, (b) is sectional drawing. According to the method for dismantling a floating roof type circular tank according to the present invention, the bogie is moved in the direction of the center of the tank along the rail by the side wall pulling means, and the side wall portion is supported by the lower portion of the reinforcing member as a fulcrum. 7A and 7B are diagrams illustrating a process of pulling down into a tank via a line, FIG. 7A is a plan view, and FIG. According to the floating roof type circular tank dismantling method of the present invention, the side wall portion is cut, the cut side wall piece is carried out of the tank, removed, and thereafter, a device for pulling the side wall portion into the tank is replaced. It is a figure showing a process, (a) is a top view and (b) is a sectional view. It is an AA arrow line view of Drawing 4 (a). It is the elements on larger scale of FIG.5 (b). FIG. 9 is an enlarged view of a portion B in FIG. 8. It is explanatory drawing which shows the conventional disassembly method, (a) is a front view which shows the state which formed the cutting part in the tank side wall, (b) is the front view which shows the state which installed the roller in the tank turning means and the cutting part. And (c) is a front view showing a state in which the tank is turned after removing the cut pieces. It is the A section enlarged view of FIG.10 (b).

  An embodiment of the method for dismantling a floating roof type circular tank according to the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing a step of providing an opening in a side wall and seating a floating roof on a bottom plate by a method of disassembling a floating roof type circular tank according to the present invention, wherein (a) is a plan view and (b). FIG. 2 is a cross-sectional view. FIG. 2 is a view showing a process of removing a floating roof out of a tank and removing the floating roof by a method of disassembling a floating roof type circular tank according to the present invention. FIG. 3 (b) is a cross-sectional view, and FIG. 3 is a diagram showing a floating roof type circular tank dismantling method according to the present invention. A rail is installed on the bottom plate between, the lower part of the reinforcing material and the rail are connected via a fixed hinge, a bogie and a side wall pulling means are installed on the rail, and the bogie and the reinforcing material are connected via a side wall supporting material. FIG. 4A is a view showing a step of connecting the movable hinge via a movable hinge, and FIG. 4 (b) is a cross-sectional view, and FIG. 4 is a view showing a step of separating a side wall portion to be removed from the side wall by the method of dismantling a floating roof type circular tank according to the present invention, and FIG. FIG. 5 (b) is a cross-sectional view, and FIG. 5 is a diagram illustrating a method of dismantling a floating roof type circular tank according to the present invention, in which a bogie is moved along a rail toward a center of the tank by a side wall pulling means. FIG. 8A is a view showing a process of pulling down the side wall portion into the tank via the side wall supporting member with the lower portion of the reinforcing member as a fulcrum, wherein FIG. FIG. 6 is a view showing a process of dismounting the side wall portion outside the tank and removing it by the method of disassembling the floating roof type circular tank according to the present invention, and thereafter, changing the apparatus for rearranging the side wall portion into the tank. FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view.

  7 is a view on arrow AA of FIG. 4A, FIG. 8 is a partially enlarged view of FIG. 5B, and FIG. 9 is an enlarged view of a part B of FIG.

  1 to 9, reference numeral 1 denotes a tank. The tank 1 includes a cylindrical side wall 3 built on a bottom plate 2 and a floating roof 4 provided at the top of the side wall 3 and capable of moving up and down along the side wall 3.

  Reference numeral 5 denotes a plurality of openings (eight in this example) provided below the side wall 3 at intervals in the circumferential direction of the side wall 3.

  Reference numeral 6 denotes a reinforcing member attached inside the side wall portion 7 to be removed. The reinforcing member 6 has a function of preventing deformation of the side wall portion 7 when the side wall portion 7 is pulled down into the tank 1 (see FIGS. 7 to 9).

  Reference numeral 8 denotes a rail installed on the bottom plate 2 between the center of the tank 1 and the opening 5, and a carriage 10 described later travels. The outer end of the rail 8 is slightly outside the side wall 3 from the opening 5. The lower part of the reinforcing member 6 and the rail 8 are rotatably connected via a fixed hinge 9 (see FIG. 9).

  Reference numeral 10 denotes a bogie that travels along the rails 8 by side wall pulling means 11 described later. The cart 10 has, for example, a structure in which both sides of the rail 8 are sandwiched between rollers (not shown), and travels along the rail 8 via the rollers.

  11 is a side wall pulling means. The side wall pulling means 11 includes a pull-side wire jacking device 12 installed at the inner end of the rail 8 and a pay-out wire jacking device 13 installed at the outer end of the rail 8 (see FIG. 8). ). As the wire jacking device, for example, the one disclosed in Patent Document 2 can be used. The wire 14 passed between the pull-side wire jacking device 12 and the pay-out side wire jacking device 13 is fixed to the carriage 10 (see FIGS. 8 and 9).

  The carriage 10 travels along the rail 8 by pulling the wire 14 by operating the pull-side wire jacking device 12 and the pay-out side wire jacking device 13 synchronously.

  The sidewall pulling means 11 may be a hydraulic jack device other than the wire jacking device. In this case, the rod of the hydraulic jack device is fixed to the carriage 10.

  Reference numeral 15 denotes a side wall support member that rotatably connects the carriage 10 and the reinforcing member 6 via a movable hinge 16 (see FIGS. 8 and 9).

  Reference numeral 17 denotes a side wall overturn prevention member stretched between the side wall 3 and the bottom plate 2. The side wall fall prevention member 17 prevents the side walls 3 on both sides of the side wall part 7 from falling together when the side wall part 7 to be removed is pulled down (see FIGS. 4 to 6).

  Reference numeral 18 denotes a slope installed before the opening 5 to eliminate a step between the opening 5 and the ground.

  According to the method of dismantling the floating roof type circular tank of the present invention configured as described above, the floating roof type circular tank can be dismantled as follows.

  First, as shown in FIGS. 1A and 1B, a plurality (eight in this example) of openings 5 are provided in the side wall 3 at intervals in the circumferential direction of the side wall 3. In order to eliminate a step between the opening 5 and the ground, a slope 18 is provided in front of the opening 5.

  Next, as shown in FIGS. 2A and 2B, the floating roof 4 is lowered and seated on the bottom plate 2. Then, the floating roof 4 is cut, and the cut roof pieces (not shown) are carried out of the tank 1 through the opening 5 and removed.

  Next, as shown in FIGS. 3 (a), (b), and FIG. 7, a reinforcing member 6 is attached to the inside of the side wall portion 7 to be removed. The rail 8 is installed, the lower part of the reinforcing member 6 and the rail 8 are rotatably connected via a fixed hinge 9, and the truck 10 and the side wall pulling means 11 are installed on the rail 8, and the truck 10 and the reinforcing member 6 are rotatably connected to each other by a side wall supporting member 15 via a movable hinge 16.

  Next, as shown in FIGS. 4A, 4B, and 7, the side wall portion 7 to be removed is cut off from the side wall 3. At this time, the lower corner portion of the side wall portion 7 is cut into an arc shape to eliminate an interference portion with the bottom plate 2. Thereby, the side wall portion 7 can be pulled down smoothly (see FIG. 9). In FIG. 9, the cut portion of the side wall portion 7 is indicated by (P).

  Next, as shown in FIGS. 5A and 5B, the carriage 10 is moved along the rail 8 toward the center of the tank 1 by the side wall pulling means 11, and the side wall portion 7 is Is pulled down into the tank via the side wall support 15 with the fixed hinge 9 as a fulcrum. At this time, since the side wall fall prevention member 17 is stretched between the side wall 3 and the bottom plate 2, it is possible to prevent the side walls 3 on both sides of the side wall portion 7 to be removed together.

  Next, as shown in FIGS. 6 (a) and 6 (b), the side wall portion 7 pulled down into the tank 1 is cut, and the cut side wall piece (not shown) is carried out of the tank 1, Remove it.

  In this manner, when the removal of the first side wall portion 7 is completed, the device to be pulled down into the tank 1, that is, the rail 8, the trolley 10, and the like are changed in preparation for the removal of the next side wall portion 7.

  As described above, according to the present invention, a floating roof type circular tank can be easily and quickly disassembled without using a large crane.

  Further, according to the present invention, when the side wall portion 7 to be removed is cut and cut off from the side wall 3, the lower corner portion of the side wall portion 7 is cut into an arc shape, so that the interference portion with the bottom plate 2 is eliminated. , The side wall portion 7 can be pulled down smoothly.

  Further, according to the present invention, when the side wall portion 7 to be removed is cut and separated from the side wall 3, the side wall portion 7 to be removed is stretched between the side wall 3 and the bottom plate 2 to thereby remove the side wall portion 7. Can be prevented from collapsing on both side walls 3.

1: Tank 2: Bottom plate 3: Side wall 4: Floating roof 5: Opening 6: Reinforcement material 7: Side wall portion 8: Rail 9: Fixed hinge 10: Dolly 11: Side wall pulling means 12: Pulling side wire jacking device 13: Feeding-side wire jacking device 14: Wire 15: Side wall support member 16: Movable hinge 17: Side wall overturn prevention member 18: Slope 21: Tank 22: Side wall 23: Cutting portion 24: Revolving means 25: Wire 26: Jack 27: Roller

Claims (6)

A method for dismantling a floating roof type circular tank, comprising: a cylindrical side wall constructed on a bottom plate; and a floating roof provided on the top of the side wall and capable of moving up and down along the side wall.
(A) providing a plurality of openings in the side wall at intervals in a circumferential direction of the side wall;
(B) lowering the floating roof and seating on the bottom plate;
(C) a step of cutting the floating roof, carrying out the cut roof piece out of the tank through the opening, and removing the roof piece;
(D) attaching a reinforcing material inside the side wall portion to be removed;
(E) installing a rail on the bottom plate between the center of the tank and the opening.
(F) connecting the lower part of the reinforcing member and the rail via a fixed hinge.
(G) installing a truck and side wall pulling means on the rail;
(H) connecting the cart and the reinforcing member via a movable hinge by a side wall supporting member;
(I) a cutting step of cutting the side wall portion to be removed and separating the side wall portion from the side wall;
(J) The carriage is moved along the rail toward the center of the tank by the side wall pulling means, and the side wall portion is placed inside the tank via the side wall support member with the lower portion of the reinforcing member as a fulcrum. The process of pulling down.
(K) a step of cutting the side wall portion, carrying out the cut side wall piece out of the tank, and removing it.
Wherein the steps (d) to (k) are repeated to dismantle the floating roof type circular tank.   The side wall pulling means includes a pull-side wire jacking device and a pay-out wire jacking device, and the wire passed between the pull-side wire jacking device and the pay-out wire jacking device is The method for dismantling a floating roof type circular tank according to claim 1, wherein the tank is fixed to a carriage.   The method for dismantling a floating roof type circular tank according to claim 1, wherein the side wall pulling means comprises a hydraulic jack device, and a rod of the hydraulic jack device is fixed to the bogie.   The disassembly of the floating roof type circular tank according to any one of claims 1 to 3, wherein the step (i) includes an operation of cutting the lower corner portion of the side wall portion into an arc shape. Method.   The floating roof type circular shape according to any one of claims 1 to 4, wherein the step (i) includes an operation of stretching a side wall overturn prevention material between the side wall and the bottom plate. How to dismantle the tank.   The method for dismantling a floating roof type circular tank according to any one of claims 1 to 4, wherein the number of the openings is eight.

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