JPH033035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of construction in which a thin-film type membrane panel provided in a low-temperature tank is fixed to a tank side plate.

<Summary of the Summary> Accordingly, the invention of this application involves transporting a predetermined number of membrane panel blocks, which are prefabricated to a predetermined size in a factory, onto the bottom plate of a tank, and lifting them one by one to remove the membrane panel blocks from the tank. This invention relates to a membrane panel installation method in which a membrane panel block is aligned with and attached to a predetermined position of a cold insulating material in a side plate and installed on the side plate, and a device directly used in the installation method. It is lifted by a hoist crane etc. installed on the circumferential guide rail at the upper end of the side plate, and during the lifting process, the work floor is raised and lowered by a gondola type work floor which is also lifted and lowered from the guide rail by a hanging device via wire. The work floor and the cold insulating material of the side plate can be passed through and lifted relatively without contacting each other, and the membrane panel block can be installed on the side board via the cold insulating material of the membrane panel block through the working floor. This invention relates to a method for installing a membrane panel for a low temperature tank, and a device directly used for the installation method.

<Prior art> As is well known, in low-temperature tanks for storing LPG and LNG, a thin membrane panel is attached to the outer tank via a cold insulating material, rather than a side plate, in order to absorb thermal behavior. However, since the membrane panel has convex corrugations for absorbing complex thermal behavior during normal operation, it has to be pre-formed into a predetermined size shape such as a rectangle. A set number of membrane panel blocks are suspended in a tank, welded together, and attached and fixed to a side plate via a cold insulator.

In this case, it is easy to install a work floor for installing the membrane panel on the side plate via a cold insulating material because it is a so-called mounted type, but it is easier to install a membrane panel block of a predetermined size on the side plate. Since the attachment of each item takes the form of vertical attachment, many cumbersome operations are generally involved in each operation from carrying in, lifting, lifting, and fixing.

Such a technique is disclosed in, for example, Japanese Patent Laid-Open No. 155478/1983.

<Problem to be solved by the invention> Conventionally, such work has been separated into individual processes that are not related to each other. The delivered membrane panel blocks are temporarily placed using a crane, etc., and then placed temporarily in a temporary packaging storage area inside the tank side plate using a crawler crane, etc., where they are unpacked and separated into separate construction areas using forklifts, etc. They were then moved to the ground, lifted up by a crawler crane, etc., and attached and fixed to the side panels.

Therefore, each construction procedure requires a lot of time and effort, and is extremely inefficient. In addition, each membrane panel block must be unpacked at a temporary packaging storage area and lifted one by one using a crawler crane. In this process, a membrane panel block temporarily placed in a substantially flat state in a temporary packaging storage area is lifted by a crawler crane, so that the membrane panel block is lifted from a flat horizontal position to an inclined position and then to a vertical position. However, it was inevitable that bending stress would be applied to the membrane panel block in the middle of the process.

In other words, the membrane panel block is made as large as possible in order to improve construction efficiency and to avoid welding thermal stress when welding together in the subsequent process, and therefore requires a considerable area. It is heavy, so in the process of moving from a horizontal temporary position to a tilted state and then to a vertical lifting state,
The lifting force acting on the upper end of the membrane panel block and the gravity acting on the lower end apply a large bending stress to the entire membrane panel block, especially near the center of gravity. When the membrane panel block is attached and fixed to the side plate, there is a disadvantage that a considerable bending deformation that cannot be ignored is formed in the membrane panel block, and it is extremely difficult to correct the bending deformation when it is attached to the side plate. Moreover, there were problems in that it required skill, took a lot of man-hours, and was dangerous.

Furthermore, when attaching and fixing each membrane panel block to the cold insulation material on the side plate, it is normal practice to follow the process of attaching it from the upper side to the lower side from the viewpoint of safety and convenience of post-processing. However, in order to deal with the above-mentioned problem, for example,
As shown in the invention of Publication No. 155478, a guide rail is provided along the upper edge of the side plate, a hoist crane is movably provided on the guide rail, and the gondola is suspended from the hoist crane via a wire to attach the membrane panel. Techniques have been developed to perform this work, but as mentioned above, the membrane panel block has a considerable size and weight, so the membrane panel block installed at the top level has to be lifted up using a predetermined method to remove the side panels. Because the membrane panel block is too heavy to be fixed to the anchor metal fittings buried in the cold insulation material, the hoist crane needed to lift it is quite large. At the final stage of hoisting the membrane panel block, the upper end of the membrane panel block interferes with the hoist crane, making it difficult to attach the membrane panel.

Furthermore, mutual interference between the gondola and the membrane panel block being lifted is unavoidable, and due to these technical constraints, it is extremely impractical to attach and fix the top membrane panel block to the cold insulation material on the side plate. The inconvenience was that it was almost possible.

In addition, from this point of view, each process of attaching and fixing the membrane panel blocks to the cold insulation material of the side plate is inevitably extremely dangerous as described above, and moreover, the number of membrane panel blocks is large, resulting in a large number of processes. However, as the capacity of the tank increases, there is also the disadvantage that the degree of danger increases.

Furthermore, the membrane panel is directly attached to its inner surface.
In order to store low-temperature liquids such as LPG and LNG in a contact state, it is necessary to perform smooth and precise machining on the corrugation as well as on the general surface around it, and to maintain such a machining state. Conventionally, in order to lift each membrane panel block along the inner surface of the cold insulation material on the side plate, it was necessary to attach a hanging piece such as a crawler crane or a hoist crane to the tip of the membrane panel.
There was also a risk that the general surface around the corrugation would be deformed or damaged, which would interfere with the operation of the tank after it was completed.

As mentioned above, for example, even if a guide rail is provided along the upper edge of the side plate and a hoist crane is used to lift the membrane panel block, the working gondola used for the operation is not attached to the membrane panel block as described above. In order to avoid interference when moving up and down relative to the block, the design structure is such that the guide rails are arranged in two rows, inside and outside, which makes the mechanism complicated, making maintenance complicated and increasing costs. It was hot too.

<Objective of the Invention> The object of the invention of this application is to solve the problems of the above-mentioned conventional technology in which a prefabricated membrane panel of a predetermined size is installed and fixed to a cold insulation material on the inner surface of a tank side plate, and Although the membrane panel block is lifted along the cold insulation material, it smoothly rises between the work floor and the side plate without interfering with the gondola-type work floor and the cold insulation material that are being raised and lowered, and, Work and operation on the membrane panel block from the work floor can be done smoothly, and the membrane panel block can be reliably installed and fixed to the cold insulation material of the side plate with high accuracy, which is an excellent feature that benefits the field of application of tank construction technology in the energy industry. The purpose of the present invention is to provide a method and apparatus for installing a membrane panel for a low-temperature tank.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the scope of the above-mentioned claims, is based on each membrane manufactured in a factory to a preset size. The panel blocks are packed in a predetermined number and transported to a temporary storage area on the bottom plate of the tank, where they are
They are unpacked, held one by one by an installation jig, and lifted up by a hoist crane or the like that engages with a guide rail installed along the upper edge of the side plate. The work is carried out from a gondola type work floor which is also suspended from a hanging device via wires so that it can be raised and lowered freely, and the membrane panel block to be lifted, together with its installation jig, does not have any cold insulation material on the side panels or It rises relatively without interfering with the work floor, and performs centering and temporary fixing of anchor hardware buried in the cold insulation material from the work surface of the work floor. Because the membrane panel block is quite large, the work floor has two levels of work surfaces, upper and lower, so that centering and tacking work on the membrane panel block can be performed safely, accurately, and smoothly. Furthermore, the work floor is equipped with a gap forming device that maintains a predetermined gap between the side plate and the cold insulation material, and a negative pressure generating device, so that the membrane panel block and the membrane panel block do not interfere with the installation jig. This is a technical measure that allows for a relative increase.

<Example> Next, an example of the invention of this application will be described below with reference to the drawings.

In the embodiment shown in Figure 1, 1 is LPG or LNG
It is a flat bottom cylindrical dome roof type low temperature tank for storage, and the dome roof is provided with a hanging deck 2 in the same manner as in the conventional embodiment, and in the illustrated embodiment, the membrane panel 7 on the periphery of the bottom plate 3 is not laid. Cold insulators 5 are attached and fixed to the inner surface of the side plate 4 one after another via gondolas 6 for attaching the cold insulators, and a membrane panel 7 is attached to the inner surface of the coolant 5. For attaching and fixing the membrane panel 7, an installation jig 8, which will be described later, and a work floor 9, which is installed on the installation jig 8 and serves as an installation device for the membrane panel block 7', are used. Furthermore, as these jigs, a receiving cart 10 and a supporting cart 11 are used for moving the membrane panel block 7' on the bottom plate 3.

Note that 12 is a pump barrel vertically installed inside the tank 1.

Next, we will explain in detail how to install the membrane panel block 7' on the inner surface of the cold insulation material 5 of the side plate 4 of the membrane panel block 7' shown in FIG. 3 is a partial front view of a membrane panel 7 attached to the membrane panel 7, which is a large-sized, heavy-weight membrane panel block 7' as shown in FIG. Each membrane panel block 7' is formed in advance at the factory into a rectangular unit of a set size according to the design, and each unit has corrugations 13 and side plates that intersect with each other in a twill pattern in appearance. Holes 14, 14, . . . for fixing anchor metal fittings (not shown), which are previously embedded in the cold insulating material 5 of No. 4, are bored in the plane portion between the corrugations 13, 13.

Then, the membrane panel blocks 7' of the unit are stacked in a predetermined number and packed in a factory, transported by truck, and transported to a temporary storage area in a tank as described later.

The installation work of each membrane panel block 7' will be explained with reference to FIG. 4.The unitized membrane panel blocks 7' are fixed one by one to a frame-shaped installation jig 8, which will be explained in detail later. and is suspended by a hoist crane 16 as a main lifting device movably mounted on one guide rail 15 provided in an annular manner between the top of the side plate 4 and the periphery of the hanging deck 2. Similarly, it is operated from the work floor 9 as a gondola-type installation device that is mounted on the guide rail 15 and lifted and lowered by hanging devices 17, 17 provided before and after the setting position of the hoist crane 16. Then, the fixing work is carried out in which the membrane panel blocks 7' are attached to the upper, middle, and lower sections of the cold insulating material 5, and then the membrane panels 7 are attached all around the circumference by moving circumferentially in each work area. be made to be done.

So, to explain each major device,
First, as shown in FIGS. 5, 6, and 7, for the hoist crane 16 that suspends the installation jig 8, a roller (not shown) is attached to a guide rail 15 that is installed around the upper end of the side plate 4 and the suspension deck 2. A motor 19 is horizontally fixed to a frame 18 mounted through the frame 18, and a hoist crane main body 20 is suspended thereon, and a controller 2 operated by a worker on the work floor 9 of a gondola-type installation device is mounted at the lower end.
A cable 22 for suspending the membrane panel block 7' is installed vertically, and a wire 24 having a hook 23 at the tip for suspending the installation jig 8 for holding the membrane panel block 7' is wound thereon.

The hoist crane 16 integrally connects subframes 26, 26 of a pair of hanging devices 17, 17 via connecting fittings 25, 25 at the front and rear of the guide rail 15, Each subframe 26 has a motor 27 in the opposite direction to the motor 19.
A bracket 28 is fixedly mounted in a cantilever manner facing the motor 19, and a chain block 29 is fixedly mounted on the bracket 28 at a position offset from the guide rail 15 by a set distance toward the side plate 4.
From there, a wire 31 having a hook 30 for suspending a gondola-type work floor 9 is suspended so that it can be raised and lowered.

In addition, as shown in FIG. 7 in the subframe 26,
It has a roller 32 for the upper surface of the lower flange of the guide rail 15 and a roller 33 spanning the entire width of the lower surface to sandwich the lower flange of the guide rail 15, and prevents rattling of the chain block 29 due to the cantilever type bracket 28. It is designed to prevent tilting.

On the other hand, as shown in FIGS. 8, 9, and 10, a gondola-type work floor 9 serving as a membrane panel installation device has suspensions as shown in FIG. It is suspended from wires 31, 31 hanging from the lowering devices 17, 17 and can be raised and lowered freely, and the frame has two upper and lower stages: an upper horizontal work surface 35 and a lower vertical work surface 35'. The work surfaces 35, 35' are integrated and can be freely communicated with each other by means of a ladder 36.

Further, on the upper working surface 35, a pair of left and right push rods 38, 38 are provided on one side of the working surface 35 so as to be movable forward and backward with respect to the side plate 4 by means of a motor 37 via a ball screw mechanism (not shown). A pad-type negative pressure suction device connected via a hose to an appropriate negative pressure generating device 39 installed in the installation tool 8, which holds the membrane panel block 7', is installed on the work floor 9 and side plate 4 of the installation device. The upper work surface 35 is provided as a gap forming device 40 for relative passage between the upper work surface 35 and
are provided on both sides of the side plate 4 and opposite to the side plate 4.

Therefore, the width between the pair of push rods 38, 38 (circumferential width of the cold insulation material 5) is smaller than the width of the installation jig 8 of the membrane panel block 7', and as described later, the installation jig 8 can be kept cool. The gap forming devices 40 and 40 are arranged so that the lateral distance between them is sufficiently wider than the width of the installation jig 8, so that they can be relatively passed through. .

Reference numerals 42 and 42' are safety nets, which are designed to allow workers to carry out necessary work on the upper and lower work surfaces 35 and 35', and to ensure safety. Further, reference numeral 43 is an opening/closing lid provided on the work surface 35 so that workers can enter and exit the upper and lower work surfaces 35 and 35'.

What is shown in FIG. 11 is an installation jig 8 for the membrane panel 7 that clamps the membrane panel block 7' of the unit previously manufactured at the factory and attaches it to the cold insulation material 5. The size in plan view is almost the same as the membrane panel block 7', and therefore it has a rectangular shape like the membrane panel block 7' shown in FIG. 3, and its vertical and horizontal cross sections are C-shaped. mold frame 4
4, 45... are integrally welded to each other, and the two corners on one side are tilted at a set angle in the vertical direction, and are flattened on the same plane as the frame 44 by a predetermined spring mechanism (not shown). Rollers 46, 46 for preventing damage to the cold insulation material surface of the side plate 4 are provided on the arm that is folded and extended in the longitudinal direction.

Therefore, since each roller 46 is folded in the longitudinal direction (vertical direction), it does not protrude in the lateral direction. Therefore, as will be described later, the gondola-type installation device can be operated by holding the membrane panel block 7' between the rollers 46. When relatively passing between the floor 9 and the cold insulating material 5 of the side plate 4, there is no interference with the push rods 38, 38 or the gap forming devices 40, 40 in the retracted position.

Also, the frames 44 on both sides of the installation jig 8 in the vertical direction,
As shown in FIG. 12, an intermediate roller 47 is provided at a predetermined portion of the vertical frame 4.
4, and a holder bracket 49 that is welded and fixed to the horizontal frame 45 integrally welded to the vertical frame 44 and extends parallel to the vertical frame 44.
The arm inserted through the round hole 50 of the vertical frame 44 has a stopper flange 51 at its base end, and is formed with a shank 52 having a rectangular cross section that is inserted into the round hole 48 of the vertical frame 44.
The shank 52 engages with a disk spring 53 provided therein to switch between the downward and sideways postures and maintain the switched posture, and a roller body 55 is disposed at the tip of a right-angled elbow portion 54 at the tip of the shank 52. It is rotatably supported.

Therefore, in FIG. 12, when the arm is manually bent downward from the illustrated state perpendicular to the plane of the paper, the shank 52 is placed in a hanging position with respect to the installation jig 8 by the spring 53, and the roller 4
Similar to 6 and 46, the roller main body 55 is vertically installed,
Moreover, by bending it horizontally, the horizontal state is maintained by the spring 53, and the frame 44
By pushing in the direction of the arrow, the elbow portion 5 is inserted into the frame 44, which has a U-shaped vertical cross section.
4, and the roller main body 55 is stored and the roller 4
6 and 46, the size of the installation jig 8 in the width direction is not substantially increased, and therefore, the installation jig 8 similarly holds the membrane panel block 7' and connects it to the gondola-type work floor 9. When relatively passing between the materials 5, there is no interference with the push rods 38, 38 or the gap forming devices 40, 40, and the relative passage can be performed smoothly.

In addition, each base end is connected to a pin 5 between a pair of frames 44, 44 provided vertically in the central part of the installation jig 8.
Arms 58, 58, .
It is rotatable by 90 degrees through the vertical frames 44, 44 in the open state, and extends between the hook 57 and the hook 57 in the closed state. The arm 58 has a lock nut 5 as shown in FIGS. 13 and 14.
An intermediate bolt 61 as a clamper whose tightening state is adjusted by screws 9 and 60 and can be raised and lowered and fixed is integrally provided with a handle 62 having a knurl formed on the circumferential surface at its lower end. The hollow bolt 61 is provided opposite to the fixing hole 14 bored in the corrugation 13 of the hollow bolt 61.
A forked fork 66 is provided with a pin 65 pivoted on the upper end of the fork 1, and the fixing hole 1 is provided at the tip of each fork 66.
Stopper 6 as a clamp that engages with the lower surface of 4
7,67, and the central fork 6
An adjustment handle 69 is provided on the male screw shaft 68 which is screwed into a female screw (not shown) provided in the fork 66, and can be rotated manually through a window 70 provided in the middle of the hollow bolt 61. The fixing hole 14 can be freely expanded or contracted.

Therefore, by adjusting the adjustment handle 69, the fork 66 is closed and the stoppers 67, 67 are moved to the thirteenth position.
As shown in the figure, the locking nuts 59, 6 are pulled together so that they come out of the fixing hole 14, and by rotating the knurled handle 62.
0, by lifting the hollow bolt 61 from the arm 58, the stoppers 67, 67 are pulled out from the fixing hole 14 of the membrane panel block 7',
Moreover, it is designed so that it can be removed from the top surface.

Then, by pivoting the arm 58 around the pin 56 parallel to the vertical frame 44 and folding it, the installation jig 8 can be attached to the membrane panel block 7' while it is being held there. Fixing hole 1 of membrane panel block 7'
4, 14... are exposed, and the cold insulating material 5 can be tack welded to an unillustrated anchor hardware.

Then, by performing the reverse operation to that described above, as shown in FIG.
It can then be clamped to the membrane panel block 7'.

Note that 71 is another lock nut.

As for clamping the peripheral part of the membrane panel block 7' to the peripheral part of the installation jig 8, as shown in FIGS. The block 7' is placed in light contact with the corrugation 13, the upper part 77 of the U-shaped bracket 76 is placed on the upper part of the frame 44 (45), and the lower part 77' is placed on the back side of the corrugation 13. along its longitudinal direction.

Then, the bolt 72 is screwed to the seat 73 of the clamper 74 through an elongated hole (not shown) drilled in the upper flange of the frame 44 (45). (The fork part of the frame is configured to move up and down in reverse.) is fixed to the frame 44 (45).

On the other hand, the lower part 77' of the U-shaped bracket 76, which has a long groove 75 perpendicular to the frame 44 (45), is shorter than the length of the long groove 75.
By forming the rubber lining on the upper surface in advance, the lower part 77' of the bracket 76 can be inserted into the back side of the corrugation 13 of the membrane panel block 7' through the rubber lining without damaging the bracket 76. The upper part 77 is pressed against the upper surface of the frame 44 (45).

In this state, a set gap is formed between the seat 73 and the bracket 76.

A tightening bolt 78 is installed in advance and extended in the vicinity of the seat 73 of the bracket 76, and the fork portion 80 of the clamper body of the clamper 74 is inserted between the pair of seats 79, 79 at the upper part of the bolt 78. It is designed to be inserted relatively.

In this state, as shown in FIG.
When pressed down, the tightening bolt 78 is raised using the bolt 72 as a fulcrum via the fork part 80 at the tip.
The lower part 77' of the bracket 76 is inserted into the back side of the corrugation 13 of the membrane panel block 7' and raised, and is pressed against the lower surface of the frame 44 (45) through the rubber lining, and the periphery of the membrane panel block 7' is pushed up. will be clamped to the periphery of the installation jig 8.

To release this, rotate the handle 81 in the opposite direction to lower the tightening bolt 78, thereby releasing the clamp around the installation jig 8 around the membrane panel block 7', and tightening the bolt 78.
Loosen 2 and insert the bracket 76 into the long groove 7 on the outside in Figure 15.
By sliding it out through 5,
Upper part 77 and lower part 7 of the bracket 76
7' is detached from the membrane panel block 7', and in this state, the bracket 76 is rotated by gravity relative to the bolt 72, and the frame 4 is
4 (45), interference with the push rods 38, 38 and gap forming devices 40, 40 of the gondola type work floor 9 is substantially avoided, and the installation jig 8, membrane panel block 7' allows for smooth passage.

The process of attaching and fixing the side plate 4 of the membrane panel block 7' to the cold insulation material 5 using the above-mentioned device will be explained with reference to the drawings from FIG. 16 onwards.
First, as shown in FIG. 16, left, right, upper, and lower writing marks 83, 83, 83', 83 for centering are placed on the membrane panel block 7' in order to position the attachment and fixing of the cold insulating material 5. ' side plate 4
It is formed to correspond to a predetermined position on the cold insulating material 5.

Of course, in this case, it is assumed that an unillustrated anchor metal fitting for the fixing hole 14 of the membrane panel block 7' is embedded in the cold insulation material 5.

Next, as shown in FIG. 17, a predetermined number of membrane panel blocks 7', which have been pre-fabricated in a factory to a predetermined size as described above, are packed and temporarily stored in a temporary storage area 84, 84 at the construction site of the tank 1. be done.

Further, work on the bottom plate 3 inside the tank 1 is carried in through a predetermined opening (not shown) in the side plate 4 of the tank 1, and as shown in FIG.
Placed in 5th place.

That is, as shown in No. 19, the bottom plate 3 inside the tank 1
Packing material 91, which is a set number of membrane panel blocks 7' piled up and packed, is loaded onto the forklift 86, truck 87, etc. carried into the tank by a crawler crane 90 through the opening 89 of the roof 88 of the tank. It is lifted and moved to a temporary storage area 85, 85 near the opening by a forklift 86, where it is wrapped in packing material 91 and the plate materials 92, 92 are placed in a second
Unpack the package as shown in Figure 0, and unravel the set number of membrane panel blocks 7'.

Therefore, as shown in FIG. 21, the gate structure 93 with rollers is moved by suspending the installation jig 8 by its chain blocks 94, 94, and is mounted on the membrane panel block 7' group. The installation jig 8 is placed on the uppermost membrane panel block 7' via the chain blocks 94, 94, . . . so that their peripheral parts are aligned.

Therefore, as shown in Fig. 22, the 11th, 13th,
14 and 15, as mentioned above, the membrane panel block 7' is clamped to the installation jig 8 using the hollow bolts 61 and the clampers 74 as each clamper, and the installation jig 8 is used to attach the top One membrane panel block 7' is held and integrated, and then the gate structure 93 is moved, and as shown in FIG. It is placed on the support cart 11.

In this state, the rollers 46, 47, .

Therefore, as shown in FIG. 24, the receiving cart 10,
The installation jig 8 holding the membrane panel block 7' on the supporting cart 11 is moved to the vertically attached part of the base of the predetermined section of the bottom plate 3 of the tank 1, and the hoist of the guide rail 15 is attached to the tip of the installation jig 8. Hook 2 of wire 24 hanging from crane 16
3, the lifting hooks are latched and connected to each other as shown in FIG. 24.

The hoist crane 16 that is stopped at a predetermined position on the guide rail 15 is similarly suspended from other hanging devices 17 and 17 that are stopped on the guide rail 15 via wires 31 and 31. The hoist crane 16 is actuated through operation by the controller 21 from the work floor 9 of a two-stage gondola-type installation device, and its wire 24 is raised, thereby lifting the membrane panel block 7'. As shown in FIG. 24, the integrally held installation jig 8 has its leading end raised, and its lower end begins to tilt with its lower end supported by the support cart 11.

Therefore, the receiving cart 10 is moved to the temporary storage area 85 via its rollers for the next preparation.

When the hoist crane 16 continues to operate, the installation jig 8 becomes suspended in a parallel position to the cold insulation material 5 of the side plate 4, and is gradually lifted up, as shown in FIG. .

Therefore, since the lower end of the installation jig 8 separates from the support cart 11, the support cart 11 is also moved to the temporary storage area 85.
I will move it to.

At this time, as shown in FIG. 24, the tip of the installation jig 8 rises and the lower end approaches the side plate 4, so a kind of rotational moment acts, and the lower roller 47 moves toward the side plate 4. As shown in FIG. 26, a worker 96 presses the lower part of the installation jig 8 to prevent it from coming into contact with the cold insulation material 5 in a light but shocking manner, while gently controlling the swinging of the jig 8. The lifting of the installation jig 8 is assisted.

As shown in Fig. 27, the installation order of attaching and fixing the side plate 4 of the membrane panel block 7' to the cold insulation material 5 in this way is indicated by circle numbers, . . . Do as you please.

That is, when attaching and fixing the first membrane panel block 7' on the uppermost stage to the cold insulating material 5, the negative pressure generating device is activated by operating the work surface 35 on the upper stage of the work floor 9 of the gondola type installation device. 39
The gap forming devices 40, 40 are activated to fix their tips to the cold insulating material 5 surface of the side plate 4, and as shown in FIG. By the continuous operation of the hoist crane 16, the installation jig 8 is lifted up while integrally holding the membrane panel block 7', and approaches the hoist crane 16 as shown in FIG.

However, in this state, the design height has not yet been reached, so we will have to carry out repositioning work, so we will temporarily stop the hoist crane 16 and move the chain blocks 29, 29 on both the front and rear sides to the work floor 9. The wires 31, 31 are lowered by operating the wires 31, 31, and are hooked onto other prepared hooks of the installation jig 8, thereby releasing the hoist crane 16 from the hooks.

When the reloading is completed in this way and the chain blocks 29, 29 are operated, the chain blocks 29, 29 are moved relative to the guide rail 15 as shown in FIG. 6, as shown in FIG. Since the installation jig 8 is offset toward the side plate 4 via the cantilever bracket 28, it is pulled up close to the inner surface of the cold insulating material 5.

At this time, the installation jig 8 relatively passes between the work floor 9 of the installation device and the cold insulation material 5 of the side plate 4, but at this time, the gap forming devices 40, 40 of the work floor 9
However, in order to maintain a sufficient distance between the work floor 9 and the cold insulation material 5 of the side plate 4 in the longitudinal direction and the width direction, and because the push rods 38, 38 are in a retracted state, , the installation jig 8 is lifted up smoothly without interference.

In the process of the installation jig 8 rising relative to the work floor 9, the worker 96 on the work floor 9 moves the installation jig 8 relative to the work floor 9. In the process of ascending, the hollow bolts 61, 61, which act as clampers for the frames 44, 44 in the vertical direction at the center of the installation jig 8, are attached to the membrane panel block 7' as explained in FIGS. 13 and 14 above. Release the clamp from above to make the arm 58 parallel to the frame 44, and then open the fixing holes 14, 14, . . . in the membrane panel block 7'.
Make sure to expose everything.

By doing this, as shown in FIGS. 30 and 31, the installation jig 8 is lifted to the set position on the uppermost stage of the cold insulation material 5, and there,
Chain blocks 29, 29 are temporarily stopped.

Next, on the upper work surface 35 of the work floor 9,
The push rods 38, 38 are pushed out through the worm mechanism by operating the motors 37, 37, and because they are provided with a width narrower than the width of the membrane panel block 7' as described above, the membrane panel block 7' is pushed out. While lightly pressing the inner surface of the cold insulating material 5 of the side plate 4, move the work floor 9 up and down slightly, and apply the vertical and horizontal markings made on the cold insulating material 5 of the side plate 4 to the part corresponding to the membrane panel block 7'. Formed Ikegaki marks 83, 83'
...Align.

At this time, if the inclination or the left and right positions of the membrane panel block 7' are uncertain, centering is ensured by independently operating the hanging devices 17, 17.

In this case, the work surfaces 35, 3 above and below the work floor 9
Since 5' is horizontal in the upper part and vertical in the lower part,
As shown in FIG. 32, center the left and right writing marks 38, 38' on the upper working surface 35, and center the lower writing marks 8 on the lower working surface 35'.
By centering 3 and 83', three-point centering can be performed automatically, and as a result, centering of the upper stage can be performed.

When the centering is completed in this way, as shown in FIG. 33, in this state, anchor metal fittings (not shown) buried in the cold insulation material 5 are attached to the respective fixing holes 14, 14, . . . of the membrane panel block 7'. Insert the minimum required number of temporary fixing bolts and tighten nuts 98, 98.
...Temporarily tighten and fix.

In this case, if necessary, the work floor 9 is raised as shown in FIG. 34 to perform upper alignment.

In this way, as shown in FIG. 35, the uppermost membrane panel block 7' can be aligned and temporarily fixed to the side plate 4 via the cold insulating material 5.

Next, the hollow bolts 61, 61, 61, 61, .
8, 58... are closed parallel to the frame 44, so that they are all exposed, and the fixing holes 14, 14... are then temporarily welded to the anchor hardware.

The welding order in this case is as shown in Fig. 36. First, as shown in Fig. 37, the groove part of the fixing hole 14 is appropriately cleaned, and the predetermined skin alignment treatment is performed. Tack welding 100 is performed using a tool to maintain the gap between the anchor hardware and the membrane panel block 7' within an allowable range as shown in FIG.

In this case, the previously temporarily tightened bolts are removed and tack welding 100 is performed in the same manner.

In this way, all the fixing holes 14, 14...
By performing tack welding 100 on the membrane panel block 7', the membrane panel block 7' is fixed to the side plate 4 through the cold insulation material 5, and the
9. There is no longer a need for a suspended state due to...

Therefore, all the remaining clampers 74 for the membrane panel block 7' of the installation jig 8 are removed one by one, and the brackets 76, 76... are attached to the frame 4.
4, 45, suspend the installation jig 8 by the reverse process to the above-mentioned process, lower it, unhang it, place it on the receiving cart 10 and the supporting cart 11 which are waiting at the lower end, and move it to the temporary storage area. 85 for the next work.

Note that, as mentioned above, in the work of lifting and attaching the membrane panel block 7' of the installation jig 8 on the second and subsequent stages while it is being held in place, unlike the attachment and fixing of the uppermost end, the work is carried out by lifting only with the hoist crane 16. In this case, welding 101 may be performed on the upper and lower ends of the existing upper membrane panel block 7' and the lower membrane panel block 7', as shown in FIG.

In addition, as shown in Figure 1, the hanging deck 2 and the bottom plate 3
A pump barrel 12 is suspended vertically between the pump barrel 12 and the side plate 4 or its cold insulating material 5. Due to design conditions, there is not a sufficient gap between the pump barrel 12 and the side plate 4 or its cold insulating material 5. As shown in FIGS. 4, 24, and 25, the wire 24 is removed by a hoist crane 16 from a horizontal state in which the installation jig 8 integrally holding the membrane panel block 7' is supported by the receiving cart 10 and the supporting cart 11. In the step of moving from the tilted state to the lifted state through the pump, the pump barrel 12 may interfere within the triangular area shown in FIG. 24.

In such a case, the pump barrel 1
The hoist crane 16 and the chain blocks 29, 29 are integrally moved along the guide rail 15 to areas other than the construction zone order, avoiding the area 2, and of course, the hanging devices 17, 17 are also integrally moved. Then, the gondola-type work floor 9 was also moved, and the installation jig 8 was moved from the horizontal state to the tilted state and then to the lifted state, as described above, that is, as shown in FIGS. 4, 24, and 25. Guide rail 1
5, the installation jig 8 and the work floor 9 are moved in parallel to the attached position of the work section in the set order, and moved between the cold insulation material 5 of the side plate 4 and the pump barrel 12, and there, the membrane panel block is After lifting the installation jig 8 which is integrated with the membrane panel block 7' by holding it in place, raising and lowering the work floor 9 and performing the attachment fixing work similar to the above, and releasing the membrane panel block 7' from the installation jig 8. Regarding the suspension of the installation jig 8, the installation jig 8 is shifted in the circumferential direction of the cold insulation material 5 again, and the hanging position of the installation jig 8 relative to the bottom plate 3 changes from a vertical state to a tilted state and then horizontally at a part outside the construction area. state,
Interference with the pump barrel 12 can be avoided when the pump is placed on the receiving cart 10 or the like.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments, and various embodiments can be adopted.

<Effects of the Invention> According to the invention of this application, basically, during the process in which one membrane panel block is integrally clamped by an installation jig and lifted along the side plate, the membrane panel block and the side plate are kept cool. Since the membrane panel block is lifted and raised without contacting or interfering with the work floor, such as a gondola type, the membrane panel block will not be damaged by interference until it is installed in the specified position. Not only does it not undergo deformation and, therefore, will not cause deformed parts or cracks in the membrane panel after the tank is completed, ensuring high precision and reliable quality, but it also This has the excellent effect of making the temporary equipment durable and providing enough usable capacity for the next construction work without damaging the type of work floor.

Therefore, the gondola type work floor is provided with a gap forming device for the cold insulation material, so that a predetermined space or gap can be actively formed between the cold insulation material on the side plate and this gap can be maintained. Therefore, as described above, an excellent effect is produced in that the installation jig that integrally holds the membrane panel can be allowed to pass relative to the work floor.

Therefore, since the work floor has a gap forming device and can actively form a space or gap for the relative passage of the membrane panel block between it and the cold insulation material of the side plate,
There is also the effect that there is more freedom in designing the position of the guide rail provided at the upper end of the side plate, and the design of the hanging deck becomes easier.

In addition, by making the work surface of the work floor into two stages (upper and lower), the work space can be increased vertically, so the space facing the cold insulation material can be made relatively small. As a result, the membrane panel block can be raised and lowered vertically, avoiding obstacles such as the pump barrel, and then the guide rail can be moved in the circumferential direction. Not only can a gondola-type work floor be raised and lowered between the pump barrel and the cold insulation material on the side plate, but also a membrane panel block can be passed relatively between the work floor and the side plate. The excellent effect of being able to perform the work and smoothly perform operations for the work is also achieved.

Furthermore, since a sufficient space and gap can be formed between the work floor and the side plate, when attaching and fixing a membrane panel block between the pump barrel and the side plate, the existing membrane panel Another excellent effect is that the next membrane panel block can be passed through with a margin between the inner surface of the block and the work floor, making work easier.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view of the low temperature tank of the invention of this application, Fig. 2 is an overall side view of the membrane panel, Fig. 3 is a front view of the membrane panel block, and Fig. 4 is a partial cross-sectional view of the low temperature tank of the invention of this application. Construction explanation schematic perspective view, Figure 5 is a side view of the guide rail lifting device, Figure 6 is a sectional view of the same side, Figure 7 is a partial sectional view of the connection between the subframe and the guide rail, and Figure 8 is a view of the gondola. A perspective view, FIGS. 9 and 10 are partial side views of the spacer, FIG. 11 is an overall explanatory perspective view of the installation jig, FIG. 12 is a partial cross-sectional view of the roller structure, and FIG. 13 is a central part of the installation jig. side view of the clamp,
Fig. 14 is a partial cross-sectional view of the same, Fig. 15 is a partial cross-sectional view explaining the structure of the clamp around the installation jig, Fig. 16 is a front view of the membrane panel block, and Fig. 17 is a plan view explaining the temporary packaging material storage area. Fig. 18
The figure is a plan view of the temporary storage area inside the tank, Figure 19 is a side view of hanging packaging materials, Figure 20 is a perspective view explaining unpacking of packaging materials, and Figures 21, 22, and 23 are the installation process of the installation jig to the membrane panel block. The perspective view, FIGS. 24, 25, and 26 are side views of lifting the installation jig, and FIGS. 27 to 39 are process diagrams of attaching and fixing the membrane panel work floor. 7'... Membrane panel block, 1... Tank, 4... Side plate, 5... Cold insulation material, 9... Working floor (membrane panel installation device), 35, 35'...
Work surface, 38... Push rod, 39... Negative pressure generator, 40... Gap forming device, 17... Hanging device,
31...Wire, 7...Membrane panel.

Claims (1)

[Scope of Claims] 1. A method in which a prefabricated membrane panel block is lifted along a tank side plate and fixed to an anchor metal fitting planted in a cold insulation material of the side plate at a set position. However, a hoist installed on the guide rail can be used to move between the tank side plate and a gondola-type work floor that is vertically movable and is suspended from a hanging device installed on the guide rail on the tank side plate, without touching the tank side plate. Membrane panel installation of a low-temperature tank, characterized in that it is lifted by a crane and operations such as centering and temporary fixing to anchor hardware are performed when installing the membrane panel block on the tank side plate via the work floor. Method. 2 In an installation device in which a prefabricated membrane panel block is hoisted along the tank side plate by a hoist crane installed on a guide rail on the tank side plate and fixed at a set position, the membrane panel block is The gondola-type work floor, which is suspended so that its relative position can be changed, is equipped with a negative pressure generator and a gap forming device, and the installation jig that holds the membrane panel block is installed between the work floor and the tank side plate to keep it cool. The above-mentioned gap forming device that allows passage between the membrane panel block and the membrane panel block is connected to a negative pressure generating device and is installed at intervals wider than the width of the membrane panel block. A membrane panel installation device for a low-temperature tank, which is installed on the working floor, and is characterized in that the working floor has two upper and lower working surfaces that can be ascended and descended via a ladder.