JP2002337984A - Apparatus and method for lifting object to be set in tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for lifting objects to be set in a tank capable of allowing pipes for heating, which have become slippery due to oil or the like, to ascend to a predetermined position in the tank in a balanced and safe state to be supported thereat and obviating damage or a load to be caused or imparted to side plates or the like of the tank when the tank is cleaned, and further to provide a method for lifting the objects to be set in the tank, excellent in workability and economy and capable of securing safely a space for cleaning work. SOLUTION: The apparatus for lifting objects to be set in a tank is installed inside a tank while maintaining a predetermined distance from a bottom face 12 of the tank 10. The apparatus has support members 21 and 21a for supporting the objects 11 thereon and lifting gears 22 and 22a. Each is disposed between each of the support members 21 and 21a and the bottom face 12 of the tank to lift the support members 21 and 21a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for elevating and lowering an object installed in a tank such as a pipe installed in a tank for storing petroleum, water, gas and the like.

[0002]

2. Description of the Related Art In a conventional large tank, an open inspection of the tank is carried out to ensure its safety. In particular, tanks storing petroleum are required by the Fire Services Act to be regularly inspected once every five or ten years. At the time of open inspection, it is necessary to inspect the bottom plate welding line part of the tank bottom by nondestructive testing etc., mainly visual inspection, magnetic particle flaw detection test, vacuum test is carried out, and the area of about 300 mm width across the bottom plate welding line Work to remove the anticorrosion material by sandblasting or the like is performed. Such tanks store petroleum and other substances for a long period of time, and as a result, residues such as sludge containing carbides, waxes, moisture, iron rust, mud sand and chlorides accumulate at the bottom of the tank, and are used for inspection and repair. Has been hindered. Therefore, the opening inspection of the tank starts with cleaning of the tank, and a series of operations are performed in the order of cleaning → inspection → repair → inspection → corrosion prevention. Tank cleaning is performed manually or by using a washing machine that performs crude oil / oil cleaning, ejector cleaning, etc., and these methods are used depending on the amount of sludge accumulated on the tank and the bottom of the tank. Have been. However, in an oil tank having a capacity of 1,000 kL or more for storing heavy fuel oil C or a substance having a high pour point, a heating pipe through which steam flows to the bottom of the tank to maintain the fluidity of the oil (which is bent in a coil shape). A piping having a formed heating coil and a heating header) is disposed, and the oil in the tank is used at a predetermined temperature (40 to 60 ° C.). Such a heating pipe is a pipe made of steel having an outer diameter of about 51 to 76 mm (2 to 3 inches), and is bent at a height of 100 to 700 mm from the bottom of the tank so as to cover almost the entire bottom of the tank. It is arranged. Since such pipes and the like are arranged at the bottom of the tank, they have poor scaffolding during inspection and repair, which hinders maintenance work on the tank. For this reason, prior to the cleaning of the tank, objects in the tank, such as pipes, which become obstacles during the opening inspection work, are lifted up and moved. FIG. 8 is an explanatory view of a conventional method of elevating and lowering an object installed in a tank. As shown in the figure, a wire rope 61 is hung on a heating pipe 60 at the bottom of the tank and lifted to the ceiling side to be moved, and the wire rope 61 is fixed to secure a cleaning space above the tank bottom. For this reason, a hook frame 62 for lifting the heating pipe 60 is set on the tank side plate by welding or the like, and the heating pipe 60 is pulled by a human power or the like through a pulley 63 or a chain block attached to the hook frame 62. Then, the supporting member 64 is welded to the side wall of the tank to prevent the fall, and the heating pipe 60 is temporarily placed.

[0003]

However, the above-described conventional method of lifting and lowering the object installed in the tank such as a heating pipe has the following problems. (1) Since the heating pipe 60 to which the oil or the like has adhered and has become slippery is lifted by hand, there is a problem that the lifting of the heating pipe 60 is dangerous if the balance is lost, and the burden on the operator is increased. there were. (2) Since the retaining frame 62 and the support member 64 are fixed to the side plate of the tank by welding, the side plate is distorted by heat at the time of welding, or the tank is deformed by the weight of the raised heating pipe 60. There was a possibility that the side plates had to be reinforced, and there was a problem that workability and economy were poor. (3) When there is a residue in the tank, there is a danger of explosion due to the generation of flammable gas, etc. Therefore, the use of equipment that uses fire or equipment that generates sparks is restricted, and the inside of the tank is made more efficient. There was a problem that cleaning was not possible.

The present invention has been made to solve the above-mentioned conventional problems, and supports an object installed in a tank such as a heating pipe, which is easily slipped by oil or the like, in a well-balanced and safe manner at a predetermined position in the tank by raising and lowering it. A tank that provides a lifting device for the equipment installed in the tank that does not damage or load the tank side plate etc. when cleaning the tank, secures a safe space for cleaning work, and is excellent in workability and economy It is an object of the present invention to provide a method of elevating and lowering an internally installed object.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for elevating and lowering an object installed in a tank, which is installed inside the tank at a predetermined distance from a bottom surface of the tank. An apparatus, comprising: a support member that supports the installation object; and an elevating device that is disposed between the support member and the tank bottom surface and that elevates the support member. This configuration has the following operation. (1) Since the lifting / lowering device of the supporting member for hanging or placing the installed object and supporting it is arranged on the bottom surface of the tank, the installed object in the tank such as a heating pipe which is easily slipped by oil or the like is well-balanced. It can be safely raised and supported at a predetermined position without using a hook member or the like, and is excellent in workability and safety when cleaning the tank. (2) It is not necessary to fix a heating pipe by welding a locking member to a tank side plate or the like when supporting an object installed in the tank at a predetermined height in the tank. It is excellent in maintainability without being damaged or deformed by the load caused by suspension. (3) Since the object installed in the tank can be pushed up while being placed on the support member having a large contact area, the force applied to the object is not concentrated on one point as compared with the case of lifting, and the moving work is performed. And the load applied to the installation object during holding can be reduced, and breakage and the like can be effectively prevented. (4) The support member has a structure that can be separated from the lifting device,
These can be disassembled and carried in through openings such as manholes provided on the side wall of the tank, etc., and the devices can be assembled and arranged in a space having a predetermined distance from the bottom of the tank, which is excellent in workability.

According to a second aspect of the present invention, there is provided the elevating / lowering device for an article installed in a tank according to the first aspect of the present invention, wherein the storage thing of the tank is petroleum, and the article installed in the tank is petroleum. It is configured to be a heating pipe for heating the other to a predetermined temperature. Accordingly, the following operation is obtained in addition to the operation of the first aspect. In other words, for a tank that contains oils that are slippery and easily flammable, the inside of the tank is safely raised from the installation position to a predetermined upper position to secure a space for cleaning work. As a result, the tank bottom can be efficiently cleaned.

According to a third aspect of the present invention, there is provided an elevating and lowering device for an object installed in a tank, wherein
A plurality of the elevating devices are provided on the bottom surface of the tank, and each of the elevating devices includes a control device that controls the elevating device and moves the supporting member up and down in conjunction with each other.
This has the following effect in addition to the effect of claim 1 or 2. Since there is a control device that moves the plurality of support members up and down in conjunction with each other, it is possible to move up and down while aligning the height of each support member on which the installation object in the tank is hung, and to raise and lower the installation object in the tank It can be reliably prevented from inclining inward or dropping off from the support member to further enhance safety.

According to a fourth aspect of the present invention, there is provided an elevating and lowering device for an object installed in a tank according to any one of the first to third aspects, wherein the elevating and lowering device has a plurality of cylinders that extend and contract in multiple stages. At each stop position. Accordingly, claims 1 to
In addition to the effect of any one of (3), it has the following effect. Since the elevating device has a plurality of nested cylinders that extend and retract in multiple stages, the elevating device can be reliably extended and retracted for each stage. Even if there is some error in each movement, the difference is at most the length of each step, the inclination between the support members is limited in a narrow range, and the stability of holding the installed object in the tank is excellent. . In addition, since there is a locking pin that locks each of the cylinders at their respective stop positions, when the lifting device is driven by hydraulic pressure, pneumatic pressure, or the like, a part of the pressure is reduced, and the support member is lowered to balance the entire device. Troubles such as collapse of an object can be reliably prevented.

According to a fifth aspect of the present invention, there is provided an apparatus for elevating and lowering an object installed in a tank according to any one of the first to fourth aspects, wherein the elevating apparatus has a hydraulic cylinder driven by hydraulic pressure. ing. This has the following operation in addition to the operation of any one of the first to fourth aspects. Since the lifting device has a hydraulic cylinder that is hydraulically driven, it is possible to work safely even when flammable gas may be generated in the tank, and to obtain high output in the operation of lifting and lowering the support member. Thus, control with excellent responsiveness can be performed, and the reliability and certainty of the lifting operation can be improved.

According to a sixth aspect of the present invention, there is provided a method for elevating an object installed in a tank, wherein the object is installed in the tank at a predetermined distance from a bottom surface of the tank. An apparatus preparing step of arranging a plurality of support members for hanging a processing member and a plurality of elevating devices for elevating and lowering the support members on the tank bottom surface, and controlling the plurality of elevating devices to link the support members to a predetermined position And a supporting member setting step for securing a space for cleaning work at the bottom of the tank, and removing the residual contents of the tank contents accumulated at the bottom of the tank using the secured space for cleaning. And a residue removing step. This configuration has the following operation. (1) Since there is an apparatus preparation step of installing a plurality of elevating devices for elevating and lowering the support member between the tank bottom surface and the installation object in the tank, the installation positions of the elevating devices are dispersed in a well-balanced manner on the tank bottom surface. By setting in the state, the subsequent support member setting step can be performed smoothly and efficiently. (2) Since no damage or load is applied to the tank side plate or the like at the time of tank cleaning, the repair cost for this can be reduced, and the economy at the time of tank cleaning is excellent. (3) The elevating device can be easily disassembled and loaded from an opening such as a manhole provided on a side wall of the tank, so that the elevating device can be disposed in a space having a predetermined distance from the bottom of the tank. It has excellent workability. (4) Since there is a supporting member setting step of controlling a plurality of elevating devices to move the supporting member up and down to a predetermined position while interlocking the supporting member to secure a space for a cleaning operation at the tank bottom, the supporting member is hung by the plurality of supporting members. The inside of the tank is partially lowered and the whole is tilted, so that the inside of the tank does not fall and the working space for cleaning the bottom of the tank can be secured safely. (5) Since the in-tank object can be pushed up while being placed on the upper part of the support member having a large contact area, the force applied to the in-tank object may be concentrated on one point as compared with the case of lifting. In addition, since it does not swing, the load applied to the processing member during the moving operation or holding can be reduced, and breakage or the like can be effectively prevented. (6) Since the method includes a supporting member setting step for securing a working space and a residue removing step for removing a residue in the tank, the working environment at the time of tank cleaning is improved, and a portion of the welding line on the tank bottom surface is improved. Can be easily inspected by a non-destructive test or the like, and the cost and the construction period of the tank maintenance can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, before cleaning a tank, an installation such as a heating pipe (installed in the tank) disposed at the bottom of the tank is raised to the top of the tank, and the space at the bottom of the tank is maintained. By performing the cleaning, the working environment in the tank opening inspection is improved, and the cleaning work and the like can be performed speedily and safely, and the cost and the construction period of the maintenance can be reduced. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a plan view and a front view, respectively, of a tank to which a device for elevating and lowering an object installed in the tank is applied. In FIGS. 1 and 2, reference numeral 10 denotes a tank for storing the stored contents such as petroleum and the like, and reference numeral 11 denotes a tank installed at an upper portion of the tank bottom surface 12 with a space therebetween to heat the stored contents in the tank. A heating pipe (installed in the tank) 13 which is bent in a coil shape through which steam or heated water flows, and 13 is used to carry equipment and the like formed on the side wall surface of the tank bottom into the tank 10. An opening (manhole). The tank 10 is a storage container made of iron, stainless steel, or the like, which is entirely formed in a cylindrical shape, a box shape, or the like, and has an internal volume of 1,000 kL or more. Tank 10
The items stored in the tank include city gas, liquefied gas, seawater and industrial water, chemicals, milk, fruit juice, and the like, in addition to petroleum. In addition to the heating pipe 11 formed in a coil shape, a heating device having a heating header, a mixing / stirring device for mixing and stirring the contents stored in the tank disposed at the bottom of the tank, temperature, components, etc. And the associated piping and the like. The heating pipe 11 may be composed of two heating pipes 11a and 11b, as shown in FIG. 1, and has a distance of 100 to 700 mm from the tank bottom in order to efficiently heat petroleum. It is arranged. Steam or high-temperature water at a predetermined temperature is flowed through the heating pipe 11, and the tank 10
The petroleum having a relatively high pour point stored therein is heated to impart a predetermined fluidity.

FIG. 3 shows an embodiment of the present invention, and is a plan view showing an arrangement of a lifting device for the contents stored in the tank installed in the tank 10 from which the contents stored in the tank are removed, and FIG. It is a schematic diagram explaining the raising / lowering method of the storage thing in a tank. 3 and 4, reference numeral 20 denotes a device for elevating and lowering an object installed in a tank;
Reference numerals 21 and 21a denote supporting members that contact the lower part of the heating pipe 11 to support the heating pipe 11, and reference numerals 22 and 22a denote hydraulic cylinders disposed between the supporting member 21 and the tank bottom surface 12 to raise and lower the supporting member 21. A plurality of lifting / lowering devices, comprising:
Is a control device for controlling the movement of the lifting / lowering device 22, respectively, 24 is an oil barrier provided for preventing oil or the like in the tank 10 from leaking when leaked, and 25 is disposed outside the oil barrier 24. This is a hydraulic unit for applying the applied hydraulic pressure to the lifting device 22. The elevating device 20 for the object installed in the tank includes a support member 21, an elevating device 22, a control device 23, and a hydraulic unit 24. When the tank 10 is opened and inspected, it is carried in from the opening 13 or the like and assembled. 10 are arranged. The support member 21 is a plate or rod-shaped arm having a predetermined contact area with the heating pipe 11 to be placed. The plate or rod-shaped upper surface is in contact with the lower surfaces of the heating pipes 11a and 11b. Placed.

FIG. 5 is a front view of the lifting device shown in FIGS. 3 and 4. In FIG. 5, reference numerals 30a to 30d denote angularly extendable hydraulic cylinders, and reference numerals 31a to 31d denote lock holes into which locking pins for fixing the respective hydraulic cylinders 30a to 30b at their maximum extension points or the like are inserted. Is a connection portion of a high-pressure hose for connecting to a hydraulic unit via a control device 23, 33 is a base portion of the elevating device 22 mounted on the tank bottom surface 12, and 34 is a portion for attaching the support member 21 to the hydraulic cylinder 30a. It is an intermediate joining member. As shown in FIG. 5, the elevating device 22 is configured in multiple stages with telescopic hydraulic cylinders 30a to 30d having a nested structure, and each hydraulic cylinder 30a to 30d can be expanded and contracted by hydraulic pressure for each stage. Is used. The movement of the hydraulic cylinders 30a to 30d is controlled by the control device 23.
The oil can be supplied from the hydraulic unit at a predetermined pressure to control the length of expansion and contraction. In addition, instead of using the lifting / lowering device composed of this multi-stage hydraulic cylinder, a lifting / lowering device composed of a cylinder that expands and contracts in one stage is used.
It can be used according to the conditions of use, such as the size of the tank and the type of storage in the tank.The lifting device is not limited to the hydraulic type, but it can be driven by air pressure or water pressure, or the screw can be driven by rotation It may be of a type that is raised and lowered by a method of causing it to move up and down. The weight of such an elevating device is such that it can be carried by two workers in consideration of transportation into a tank or the like.
Preferably, the weight is less than kg.

FIG. 6 is a conceptual diagram illustrating a method of controlling a hydraulic unit for driving a plurality of lifting / lowering devices according to an embodiment of the present invention. In FIG. 6, reference numeral 40 denotes a hydraulic unit, 41 denotes a first-stage hydraulic supply unit for supplying a predetermined hydraulic pressure to a cylinder of each elevating device, and 42a to 42c denote respective elevating devices to which hydraulic pressure is added in the first-stage hydraulic supply unit. And three second-stage hydraulic pressure supply units for applying finely adjusted hydraulic pressures to the cylinders. As shown in the figure, six elevating devices are arranged for heating pipes 11a for a half system on the tank bottom surface 12, and a hydraulic unit 40 applies hydraulic pressure to three elevating devices for half of the six units. It is set so as to be supplied, and in total, six lifting / lowering devices are driven by two hydraulic units 40. When the cylinder extension / retraction operation of the lifting / lowering device is performed using the hydraulic unit 40, first, the first
The oil is supplied to the second-stage hydraulic supply unit 41 and the second-stage hydraulic supply unit 4 is supplied with oil.
The supply hydraulic pressures 2a to 42c can be operated while balancing a plurality of lifting / lowering devices using a control device.
By using such a hydraulic unit 40, a fine adjustment operation can be easily performed when a processing member such as a heating pipe is moved up and down.

FIG. 7 is a perspective view of a lifting device according to another embodiment of the present invention. In FIG. 7, reference numeral 50 denotes an elevating device for suspending a processing member, and reference numeral 51 denotes a tank bottom surface 1.
The outriggers 52 mounted on the base 2 and expanded in four different directions at the base of the rectangular lifting device 50 are configured in multiple stages, each of which is (52a to 52c).
Is a rectangular cylinder part that can be extended and contracted, 53 is a support member formed by extending horizontally at the tip of the cylinder part 52, and 54 is a space at a predetermined position in the longitudinal direction of the support member 53. The hook holes 55 provided are wire ropes for suspending and supporting the heating pipe 11 in the hook holes 54. In the elevating device 50 of the present embodiment, the support member 53 is disposed above the heating pipe 11 at intervals close to the heating pipe 11, and is suspended by the hook holes 54 of the support member 53 via the wire rope 55. It can be moved up and down, and can be used instead of the above-mentioned mounting type elevating device 22.

The control device 23 shown in FIG. 4 is a device for controlling the operation of the lifting device 22 via the hydraulic pressure supplied from the hydraulic unit 25 to raise and lower the support member 21.
When a plurality of lifting devices are arranged in a large tank having a capacity exceeding 1,000 kL, the lifting device 2
Since the length of the high-pressure hose 29 from the hydraulic unit 25 serving as a drive source is different for each of the second and second 22a, the supporting members 21 driven by the respective lifting / lowering devices 22, 22a under the influence of pressure loss in the high-pressure hose, etc. The lifting speed of 21a may be different. For this reason, there is a danger that the heating pipe 11 to be lifted is raised and lowered in an inclined state, and the heating pipe 11 falls. Therefore, in order to raise the heating pipe 11 to a uniform height, it is necessary to control the lifting and lowering devices 22 and 22a in conjunction with each other.
For this purpose, the control device 23 for performing remote control of the elevating devices 22 and 22a is provided with a multi-stage cylinder 52.
It is preferable that the stroke for each of a, 52b, and 52c (see FIG. 7) be set within a certain length. In the control method of the control device 23, the lifting devices 22, 22
It is desirable to adopt an interlock control system that prevents the next stage from moving up and down until the cylinders 52a, 52b and 52c of each stage of a have completely moved up and down. by this,
Even if the control device 23 breaks down, since the vertical difference between the lifting devices 22 and 22a at the time of lifting and lowering is within a certain length, it is possible to prevent the heating pipes 11 and 11a from falling due to the inclination. In addition, each cylinder 52a, 5 of each lifting device 22,22a
A pressure sensor for detecting the hydraulic pressure supplied to the 2b and 52c and a distance sensor for detecting the amount of expansion and contraction of the cylinder are attached.
These data are taken into the control device 23, and based on these data, control is performed such that the ascending and descending speeds of the supporting members 21 and 21a which are raised and lowered by the respective lifting and lowering devices 22 and 22a and the cylinder extension length are operated in synchronization. You can also. In addition, when the entire lifting device can be seen, the control device 23 can be manually moved so as to align the lifting height while visually observing the height of the support members 21 and 21a.

In FIG. 4, a hydraulic unit 25 is installed outside the oil barrier 24 and is connected to the lifting devices 22 and 22a through a high-pressure hose 29 into the tank. Hydraulic unit 25
The number of installations depends on the pressure loss and flow rate in the high-pressure hose 29,
It is desirable to determine the size of the motor by examining the drive power of the motor for driving the hydraulic unit 25 and the like.
For example, one hydraulic unit can be operated in conjunction with two lifting devices. It is also preferable that the weight of the hydraulic unit 25 be within the range that can be moved by a small mobile crane truck or the like. The high-pressure hose 29 has a wire with a function of preventing static electricity explosion in terms of safety.
One layer thicker than normal high-pressure hose, taking into account twisting etc. 4
It is preferable to use a hose having a layer structure.

Next, a method of elevating and lowering the article installed in the tank using the apparatus 20 for elevating and lowering the article stored in the tank configured as described above will be described with reference to FIGS. A heating pipe (installed in the tank) 11 in the tank 10 is formed by using a member carried into the tank 10 through the opening 13 or the like.
In consideration of the weight balance of a, the area in which the heating pipe 11a is installed, and the like, a predetermined number, in this case, six elevating devices 22, are arranged at predetermined positions on the tank bottom surface 12. The support members 21 and 21a are passed under several heating pipes 11a. The control device 23 is installed outside the opening 13 of the tank 10 and the high-pressure hose 29 is connected. The flange to which the heating pipe attached to the tank 10 is fixed is cut off, and the heating pipes 11 and 11a are separated.
From the side wall of the tank 10 (device preparation step). Next, after confirming that there is no worker in the tank 10, the supporting members 21 and 21a are raised using the control device 23 while maintaining the balance so as to interlock with each other, and stopped at a predetermined position. When the movement of the support members 21 and 21a is completed, the elevating device 2
Locking pins are set in lock holes 31a to 31d provided in the cylinders 30a to 30d of the cylinders 2 and 22a to lock the cylinder positions (support member setting step). Using the space for cleaning work secured in the support member setting process, the remaining of the tank contents accumulated on the tank bottom surface 12 and the anticorrosive material covering the surface are subjected to sandblasting, grid blasting, high-pressure jet peeling, and the like. (Residual removal step). Non-destructive inspection such as visual inspection, iron powder flaw detection test, vacuum test, etc. is performed on the weld line portion such as the bottom surface from which the residue has been removed to confirm the presence or absence of repair (inspection process). After the necessary repairs are performed, the inspection is performed again, and if there is no abnormality, an anticorrosive material such as an epoxy resin is sprayed onto the tank bottom surface 12 or the like to apply a coating or lining by a method such as painting to perform an anticorrosion treatment (repair, corrosion prevention) Process). Through the above steps 1 to 5, all the steps of the method of lifting and lowering the object installed in the tank are completed.

[0019]

The present invention will be described in more detail with reference to the following examples. In the present embodiment, the apparatus 20 for lifting and lowering the installed object in the tank and the method for raising and lowering the installed object in the tank are applied to a dangerous goods tank having a capacity of 20,000 kL class. The heating pipes arranged at the bottom of the dangerous goods tank were divided into two right and left parts in the tank, and the divided heating pipes 11a and 11b were separately raised by three lifting devices. The weight of the heating pipe 11a divided in half was about 6 tons. Choosing within the limits of cylinder weight and equipment size applicable to raising and lowering this weight, the maximum lifting load per lifting equipment is approximately 15,000 Newtons (150
0 kgf). The design lifting weight per lifting device is 1500 kg, and the heating pipe 11
The area of the area (half of the area in the tank) for raising the height was about 700 square meters. In consideration of the type of the processing member such as the heating pipe 11 and the lifting position (position of the lifting device), the lifting device 22 must be at least 6 as shown in FIG. It has been found that it is necessary to arrange the tables (three on the half side of the heating pipe) on the tank bottom surface 12 with a predetermined interval and arrangement in a well-balanced manner. If the height of the heating pipes pushed up for each lifting device is different from each other and the balance is poor, the heating pipes may fall and lead to a serious accident.
As mentioned above, in the tank open inspection, cleaning → polishing →
Work is performed in the order of inspection → repair → inspection → corrosion prevention.In the present invention, since the space for cleaning is safely secured,
The working environment in each work is greatly improved, the burden on the worker can be reduced, and the safety is greatly improved as compared with the case where the heating pipe is manually lifted. In this embodiment, a process for setting the plurality of lifting devices 22 in the tank in a predetermined arrangement is required. However, even if this process is deducted, the number of steps and processes are greatly reduced, and a significant cost reduction is achieved. Can be.

The apparatus for elevating and lowering the items stored in the tank and the method for raising and lowering the items installed in the tank according to the present invention are configured as described above, and have the following operational effects. (1) Since the heating pipes 11a and 11b have the elevating devices 22 and 22a for raising and lowering the support members 21 and 21a on which the heating pipes 11a and 11b are placed, the heating pipes 11a and 22a are easily slipped by oil or the like.
11b can be safely moved and supported at a predetermined position in the tank 10 with good balance. (2) When cleaning the tank, there is no need to weld and secure the heating pipe to the tank side plate or the like by fixing the heating pipe, so that damage due to welding or load due to hanging of the processing member may be applied to the tank side wall or the like. Therefore, the cost of the maintenance of the tank 10 is excellent. (3) Connecting the heating pipes 11 and 11a to the support members 21 and 21a
Is pushed up in a state where it is placed on the upper part of the pipe, so that a pushing force is applied with a wide contact area, and the heating pipes 11 and 11a
Since it does not swing, it is possible to effectively prevent damage or the like during movement or holding. (4) The lifting devices 22 and 22a are sized so that they can be arranged in a space having a predetermined distance from the tank bottom surface 12, and are easily carried in and assembled from openings such as manholes provided in the side wall portions of the tank. The setting work can be easily performed by a small number of people. (5) Since there is a control device 23 that can move the plurality of support members 21 and 21a up and down in conjunction with each other, the height of each of the support members 21 and 21a that mounts and supports an object installed in the tank is provided. Can be raised and lowered in an interlocked state while aligning them, and it is possible to reliably prevent the object installed in the tank from tilting or falling off from the support members 21 and 21a to further enhance safety. (6) Since the lifting device has a plurality of nested cylinders 30a to 30d that expand and contract in multiple stages, when a large number of lifting devices are arranged on the tank bottom surface, even if there is some error in the movement of each stage. Since the difference is limited to the length of each step at the maximum, the inclination between the support members is also limited in a narrow range, and the stability of holding the processing member is excellent. Further, each of the hydraulic cylinders 30a to 30d is connected to each of the lock holes 31a to 3d.
Since the locking pin can be inserted and fixed at the position 1d, when a plurality of lifting devices are driven by hydraulic pressure, air pressure, etc., and the whole is held, the pressure of a part of the lifting device decreases, and the supporting member is lowered. Can be reliably prevented from falling down and the overall balance being lost. (7) Since the lifting device has a hydraulic cylinder that is hydraulically driven, even when flammable gas may be generated in the tank, the operation can be performed safely, and the responsiveness in the operation of raising and lowering the support member can be improved. Control can be performed, and the reliability of the lifting operation can be increased. (8) Since there is an installation step of installing a plurality of elevating devices for elevating and lowering the support member between the tank bottom surface and the installation object in the tank, the installation positions of the elevating devices are set in a well-balanced state on the tank bottom surface. Thus, the subsequent cleaning preparation process can be performed smoothly and efficiently. (9) There is no need to fix the fasteners to the tank side wall by welding when cleaning the tank, and no damage or load is applied to the tank side wall, so that the repair cost for this can be reduced and the economy during tank cleaning is reduced. Is excellent. (10) The elevating device has a size that can be arranged in a space having a predetermined distance from the bottom of the tank, and can be easily loaded and assembled through an opening such as a manhole provided on a side wall of the tank. Excellent workability. (11) Since there is a cleaning preparation step of controlling a plurality of lifting / lowering devices to move a supporting member to a predetermined position in conjunction with the supporting member to secure a space for a cleaning operation at the bottom of the tank, it is hung by the plurality of supporting members. It is possible to prevent the processing member from dropping due to a part of the object installed in the tank being lowered and tilted, and it is possible to safely secure a working space for cleaning the tank bottom. (12) Since the in-tank object can be pushed up while being placed on the upper part of the support member having a large contact area, the force applied to the in-tank object may concentrate on one point as compared with the case of lifting. In addition, the load applied to the processing member during the moving operation or holding can be reduced, and breakage or the like can be effectively prevented. (13) Since it has a cleaning preparation step for securing a working space and a residue removal step for removing the residue in the tank,
By improving the working environment at the time of tank cleaning, the welding line portion on the bottom of the tank can be easily inspected by a nondestructive test or the like.

[0021]

According to the present invention, it is possible to secure a space for cleaning work by safely moving an installation object such as a heating pipe disposed at the bottom of the tank to the top of the tank before cleaning the tank. By cleaning the bottom of the tank in this manner, the working environment in the tank opening inspection can be improved, the cleaning operation can be performed speedily and safely, and the cost and the construction period of the tank maintenance can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a tank to which a device for elevating and lowering an object installed in a tank according to an embodiment of the present invention is applied.

FIG. 2 is a front view of a tank to which a device for lifting an object installed in a tank according to an embodiment of the present invention is applied.

FIG. 3 is a plan view showing an arrangement of a device for elevating and lowering an article installed in a tank according to an embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a method of lifting and lowering an object installed in a tank according to an embodiment of the present invention.

FIG. 5 is an enlarged front view of a lifting device according to an embodiment of the present invention.

FIG. 6 is a conceptual diagram of a hydraulic unit control method according to an embodiment of the present invention.

FIG. 7 is a perspective view of a lifting device according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a conventional example of a method of elevating and lowering an object installed in a tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tank 11 Heating pipe (installed thing in tank) 11a, 11b Heating pipe 12 Tank bottom 13 Opening 20 Lifting device 21 of tank installed thing 21, 21a Supporting member 22, 22a Lifting device 23 Control device 24 Oil barrier 25 Hydraulic unit 29 High-pressure hose 30a-30d Hydraulic cylinder 31a-31d Lock hole 32 High-pressure hose connection part 33 Base part 34 Intermediate joining member 40 Hydraulic unit 41 First-stage hydraulic supply units 42a-42c Second hydraulic supply unit 50 Lifting device Reference Signs List 51 Outrigger 52a to 52c Cylinder part 53 Support member 54 Hook hole 55 Wire 60 Heating pipe 61 Wire rope 62 Hook frame 63 Pulley 64 Support member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masashi Nakamitsu 443 Hirata, Kudamatsu City, Yamaguchi Prefecture Nisshin Kogyo Co., Ltd. F-term (reference) 3E070 AA03 AB03 BK00 BK10 DA01 EA01 EB03 RA01 RA30

Claims (6)

[Claims] 1. An apparatus for elevating and lowering an object installed in a tank, which is installed inside the tank at a predetermined distance from a bottom surface of the tank, comprising: a support member for supporting the installed object; And an elevating device for raising and lowering the support member. 2. The tank according to claim 1, wherein the tank is a tank for storing petroleum, and the object installed in the tank is a heating pipe for heating petroleum and the like to a predetermined temperature. Elevating device for internal installation. 3. The apparatus according to claim 1, wherein a plurality of said lifting devices are provided on a bottom surface of said tank, and a control device is provided for controlling each of said lifting devices to raise and lower said supporting members in conjunction with each other. 3. The elevating and lowering device for an in-tank object according to 2. 4. The apparatus according to claim 1, wherein said lifting device has a plurality of cylinders which extend and contract in multiple stages, and has a locking pin for locking each of said cylinders at a respective stop position. The lifting device for the in-tank installation according to the above. 5. An apparatus for lifting an object installed in an oil tank according to claim 1, wherein said lifting apparatus has a hydraulic cylinder driven by hydraulic pressure. 6. A method for elevating and lowering an article installed in a tank installed inside a tank at a predetermined distance from a bottom surface of the tank, comprising: a support member for hanging the article installed in the tank; A device preparation step of arranging a plurality of elevating devices for raising and lowering on the bottom surface of the tank, and controlling the plurality of elevating devices to move the supporting member to a predetermined position in cooperation with each other, thereby providing a space for cleaning work at the tank bottom. A tank, comprising: a supporting member setting step for securing; and a residue removing step for removing a residue of the contents stored in the tank at the bottom of the tank using the secured space for the cleaning operation. How to raise and lower objects installed inside.