JP2585194B2 - Scaffolding device inside spherical tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffold inside a spherical tank used for inspection and repair of the inside of an LNG tank or the like.

[0002]

2. Description of the Related Art Conventionally, as a facility for inspecting the inside of a spherical tank, for example, an apparatus as shown in FIG. 12 has been temporarily installed in the tank as an inspection facility for an LNG spherical tank. This apparatus is provided with two platforms 105, 1 above and below a pipe tower 103 of a spherical tank 100.
06 is provided in advance, one end of the beam 200 is supported by a central platform 105 so as to be rotatable around the pipe tower 103, a gondola type inspection cage 201 is attached to the other end of the beam 200, and the upper platform 106 is mounted. It is formed by locking the other end of the beam 200 with a wire 202 locked so as to be able to take up / rewind and turn around the pipe tower 103. According to this device, the entire inner surface of the spherical tank can be inspected by turning the beam and operating the wire.

[0003] However, such an inspection facility requires that the platforms 105 and 106 be provided on the pipe tower 103, and that the beam 200 is supported only at one end and the other end is locked by a wire. It is easy to shake and the workability of inspection etc. is not good, it can not be used for tanks equipped with a pipe tower without a platform or tanks with different tank dimensions, there is no versatility, and the structure is complicated and it breaks down It is easy to assemble, and it is possible to inspect the entire tank, so it is a gondola type, it is dangerous and it is not easy to assemble.Therefore, safety requirements are severe and require the approval of the Labor Standards Bureau, for example. In addition, there are problems that the structure becomes more complicated and expensive, and that the procedure for permitting and permitting is complicated.

[0004] In addition, Japanese Utility Model Application Laid-Open No. 55-108079 discloses a similar one, but the safety,
There is a problem similar to the above-described conventional technology in terms of the complexity of the structure and the like.

On the other hand, in an LNG tank and other spherical tanks, since the load of the entire tank is generally supported by the equatorial part of the tank, the part becomes important in terms of structure and strength. Inspection is often performed.
In addition, the need for testing is greater in the lower hemisphere than in the upper hemisphere. Therefore, the utility of the equipment capable of inspecting the southern hemisphere including the equator is high.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, has a simple structure, does not cause a failure or the like, has good stability, and can be diverted to another spherical tank.
It is an object of the present invention to provide a spherical tank internal scaffolding device that can be easily assembled without a special structure such as a platform in a pipe tower, and that can be inspected and repaired in the southern hemisphere of the spherical tank.

[0007]

According to the present invention, in order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a spherical tank internal scaffolding device is provided with a vertical cylindrical body provided at a central portion of a tank bottom. Having a bottom structure, a spherical upper structure, a reinforcing structure, and a spherical support member, wherein the lower structure is formed by coupling a plurality of elongated first members. It is supported so that it can rotate around the shape,
The spherical upper structure is formed by coupling a plurality of elongated second members, is coupled to the bottom structure, extends near the inner surface of the spherical tank to near the equator, and extends in the longitude line direction of the spherical tank. Wherein the reinforcing structure is formed by coupling a plurality of elongated third members to reinforce the spherical upper structure, and the reinforcing member above the spherical surface is rotatably coupled to the spherical surface at a plurality of positions. Is in contact with the inner surface of the tank, supports the vicinity of the connection of the spherical upper structure movably at least in the direction of the latitude line of the spherical tank, the spherical upper structure and the reinforcing structure are the bottom structure and The invention according to claim 2, characterized in that the second member is formed of a flat surface in addition to the rigidity described above, wherein the rigidity is such that the shape can be maintained integrally when supported by the support member on the spherical surface. Be rigid Characterized in that it has an assembly member formed in a child shape.

[0008]

According to the first aspect of the present invention, since the structure is formed by connecting a plurality of elongated first to third members, the spherical tank is provided for arranging a pipe or the like or for accessing the tank bottom. The first to third members of a single body are carried into the tank from the pipe tower opening of the cylindrical body provided in the center,
These can be assembled as a structure inside the tank. Since the bottom structure is provided at the center of the tank and is supported so as to be rotatable around the cylindrical body, it can be used by rotating it 360 ° about the bottom. Since the spherical upper structure is connected to the bottom structure and extends to the vicinity of the equator along the vicinity of the inner surface of the spherical tank, a suitable scaffold or the like is provided on the spherical upper structure, and the bottom structure is mounted on the spherical structure.
By rotating the tank, it becomes possible to perform operations such as inner surface inspection of the tank at least in the entire area of the southern hemisphere up to the equator.

The spherical upper structure is formed by combining a plurality of elongated second members, and is rotatable in a direction perpendicular to the spherical surface at a plurality of positions in the longitudinal direction so as to be adjusted according to the curvature inside the tank. It is connected in such a way that its vicinity is supported movably in the direction of the latitude line by the support member on the spherical surface, so that the plurality of support points are brought into contact with the spherical surface and assembled sequentially along the spherical surface, so that it is near the equator It can be extended up to. In this case, since the load of the structure on the spherical surface is supported by the spherical surface via the support member, strength such as bending rigidity of the entire structure in the spherical direction is not required. Therefore, the structure has a lightweight and simple structure and is easy to assemble. Since the support member is movable in the direction of the latitude line, the support member can easily turn in the direction of the latitude line within the spherical surface during work such as inspection.

On the other hand, the spherical upper structure is reinforced by a reinforcing structure, which has a rigidity capable of maintaining its shape as a single body when supported by the bottom structure and the spherical upper support member. In this case, the structural body is not largely deformed by the forces in the directions of the longitude, the longitude and the latitude along the spherical surface, and the safety of the structure is maintained. In this case, no external force is originally applied in the direction of reflection from the spherical surface and in the direction of the latitude line along the spherical surface, and the external force in the longitude line direction along the spherical surface due to its own weight is small because of its lightweight structure. It is. Therefore, complicated and heavy reinforcement is not required to maintain the strength of the structure.

According to the invention of claim 2, in addition to the above,
Since the second member forming the structure on the spherical surface has an assembly member formed in a ladder shape so as to have planar rigidity, the number of members required to maintain strength is reduced, and the structure and assembly are further simplified. can do. In addition, this assembly member can also be used as a scaffold for assembling and disassembling operations.

[0012]

FIG. 1 schematically shows the overall structure of a scaffolding device inside a spherical tank according to the present invention. The scaffolding device is disposed, for example, in a spherical tank 100 for an LNG ship, and includes a turning support portion 1 as a bottom structure, a plane portion 2 as a spherical upper structure,
And a three-dimensional part 3 as a reinforcing structure. The spherical tank 100 on which this scaffolding device is assembled has a bottom 101
Entrance 1 with door as opening provided in the center of the building
02 has a pipe tower 103 as a cylindrical body. The plane portion 2 is connected to the swivel support portion 1 and extends along the vicinity of the inner surface of the spherical tank 100 to the vicinity of the equator 104. The three-dimensional part 3 is connected to the flat part 2 to reinforce it. The plane portion 2 is movably supported on the inner surface of the spherical tank 100 via a support roller 4 as a support member on a spherical surface. A stage 5 and an enclosure 6 are provided at the top of the structure so that the equator can be inspected and repaired. Reference numeral 7 denotes a tow rope for turning the scaffold device in the direction of the latitude line as indicated by the arrow.

FIG. 2 shows the structure of the turning support 1. The turning support 1 is formed in an octagonal shape by a plurality of elongated pipes 11 as first members, and the respective pipes are joined by bolting a flange 12 welded to the pipe. A guide roller 13 that comes into contact with the pipe tower 103 and a turning roller 14 that comes into contact with the bottom 101 of the spherical tank are attached to the swivel support 1, as shown in FIG. 103 is rotatable. The guide rollers 13-1 and 13-2 of the guide rollers 13 attached to the pipe 11-1 to which the flat portion 2 is connected, support the pressing force from the flat portion 2 in a direction perpendicular to the plane of FIG. Are provided two by two in the vertical direction. The turning roller 14 may have a structure similar to that of the guide roller 13, but in the present embodiment, the turning roller 14 is a freely movable roller in any direction in order to rotate the circular orbit more smoothly.

FIG. 4 is an elevational view showing the structure of the swivel support portion 1 and the flat portion 2 as viewed from the inner surface of the spherical tank 100 at right angles to the inner surface. The flat portion 2 is formed by connecting pipe ladders 21 on both sides, which are a plurality of elongated second members and are assembly members, and a horizontal pipe 22 connecting them. Further, the pipe towers on both sides are used as a scaffold at the time of assembling and disassembling the scaffold device, as well as being a structural member of the flat portion. As shown in FIG. 8, the space between the pipe ladders 21 can be rotated in a direction perpendicular to the spherical surface so that the position can be adjusted at a plurality of positions P _{1 to} P ₄ in the longitude line direction according to the curvature inside the tank. together are joined, so that the length and weight is a suitable value of the degree does not hinder the transportation of the and the tank pipe tower are coupled even positions Q ₁ to Q ₅ longitude line direction. An elevating ladder 23 is provided at a central portion of the plane portion 2. The tip of the flat part 2 is a pipe 2 of vertical and oblique material as a second member.
4 and 25 are connected to each other. The pipe ladder 21 is made of a gas pipe or the like.
It is formed by welding a step pipe 21b between a. A wire stay 8 composed of a wire rope or the like stretched with an appropriate tension is provided between both sides of a portion near the tip of the flat portion 2 and both sides in the width direction of the turning support portion 1 to reinforce and swing the flat portion 2. It is also used as a stop.

FIGS. 5A and 5B show the position P
3 and 4 show the structure of a joint between the pipe ladders 21 in Q. Pipe 21a of pipe ladder on both sides to be joined
, A steel plate 21c having a hole 21c-1 and a semicircular end is fixed by welding, and the pipe ladders 21 are joined by bolting the overlapped holes. I have. The joint at the position P has one hole, and the pipe ladders 21 on both sides are rotatable with each other, and can be adjusted to the curvature inside the tank, but the joint at the position Q does not rotate.

FIG. 6 shows the structure of the joint between the pipe ladder 21 and the pipe 11 at the position P 'where the turning support 1 and the plane 2 are connected. This part is also shown in FIG.
Like the joint shown in (a), the structure is adapted to the curvature inside the tank. In this part, the steel plate 11a
Is fixed by welding in a direction perpendicular to the pipe 11. At a position on one side of the pipe 21a of the pipe ladder 21, a turning roller mounting plate 11b also shown in FIG. 3 is fixed by welding.

FIG. 7 shows the structure of the joint between the pipe 21a of the pipe ladder 21 and the horizontal pipe 22 near the position P. Both pipes are connected by pipe clamps 23,24. At both ends of the horizontal pipe 22, a short pipe 22
a is welded and the pipe 21a of the pipe ladder 21
Is connected to this short pipe 22a. Below these pipes, a mounting plate 26 of the support roller 4 is fixed by welding. The support roller 4 is attached to the support plate 26 and supports the structure. Further, since these rollers are intended to make it easy to move the structure in the direction of the latitude line, it is essential that the rollers can travel in that direction. Since there is a possibility of expansion and contraction and displacement in the direction as well, in this embodiment, it is a free roller like the turning roller 14. However, a normal roller may be used.

FIG. 8 is a side view showing a schematic shape of the flat portion 2 and the three-dimensional portion 3 as viewed in a sectional direction of the spherical tank 100. 9 shows an elevational shape of the three-dimensional portion 3 in the tank inner surface direction, and FIG. 10 shows a cross-sectional shape of the flat portion 2 and the three-dimensional portion 3 at positions P and Q. The main part of the three-dimensional part 3 includes a plurality of elongated third members as triangle forming pipes 31,
It is composed of a connection pipe 32 and a vertex connection pipe 33. These pipes are all connected by pipe clamps. On top of the upper structure from the position Q _5,
As shown in FIG. 11 which is an elevation view of the R position,
An intermediate structure is provided with a lifting ladder 37 attached to a frame to which the horizontal and oblique pipes 34, 35, 36 are connected, and a step 5 and an enclosure 6 are provided at the top thereof. The flat part 2 and the three-dimensional part 3 rising from the flat part 2 are supported by the tank inner surface and the swivel support part 1 at positions P _{1 to} P ₄ and position P ′.

As described above, in this scaffolding device for inspecting the inner surface of a spherical tank, the structure is supported at a plurality of positions on the inner surface of the tank via the adjustable roller 4, so that the flat portion is bent at this portion. The scaffolding device can be easily assembled along the inner surface of the tank, and can be easily assembled along the inner surface of the spherical tank sequentially upward from the bottom. in this case,
Because of the multi-point support structure, the device is reduced in size and weight, and further easier to assemble. Also, since all members are elongated and have an appropriate length, the pipe tower 103
Can be carried in / out from the entrance 102 of the vehicle. This scaffolding device can be used for spherical tanks having different tank sizes and different diameters of pipe towers only by changing a part of a member such as a tip portion and a turning support portion.
Further, since the pipe ladder 21 is used for the flat portion, a large flat rigidity is obtained with a small number of members by connecting the pipe ladder 21 to the horizontal pipe 22.

This scaffolding device transmits the force by pulling the tow rope 7 to the structure on the spherical surface, and transmits the rotational force to the bottom structure via the joint at the position P 'and the wire stay 8, By rotating the swivel support 1 and rotating the entire scaffold structure 360 ° about the tank bottom, the equator 104 is used primarily for inspection and repair of the entire southern hemisphere below it. In this case, since the structure has sufficient plane rigidity, it can withstand acceleration due to turning and can maintain stability without swaying at the stopped position. Also, since the three-dimensional part 3 reinforces the planar structure,
Even if there is a structure such as the inspection stage 5 at the top protruding from the tank surface, it has sufficient bending rigidity against the moment generated in the tank center direction caused by the structure. As described above, by providing the rigidity necessary for maintaining the shape of the entire structure, the safety of the scaffolding device is ensured.

In the above description, an example in which the structure has a pipe structure using a pipe ladder or the like has been described. Alternatively, an angle, a channel material, or the like, or another structure such as a truss structure may be used. Of course, it may be adopted. Further, although the turning support portion is octagonal, other shapes such as hexagonal and circular may be used. In the case where the pipe tower is not cylindrical but rectangular, a similar turning support can be formed by additionally providing a cylindrical guide ring. Furthermore, even in a spherical tank without a pipe tower, a turning support can be formed by temporarily installing a cylindrical guide at the center of the tank as a vertical tubular body for construction.

[0022]

As described above, according to the present invention, since the structure is supported at a plurality of positions on the inner surface of the spherical tank, the scaffolding device inside the spherical tank can be easily assembled with a simple structure. , Good stability. In addition, one device can be used for all spherical tanks. Further, the swivel-type scaffolding device can be easily assembled even in a spherical tank in which the platform is not provided in the pipe tower. In the invention of claim 2,
In addition to the above, since the second member has the assembly member formed in a ladder shape, the number of members to be assembled in the tank can be reduced, the structure and the assembly can be further simplified, and the assembly member can be used when assembling the scaffolding device. It can also be used as a scaffold for dismantling.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall structure of a scaffolding device inside a spherical tank according to an embodiment.

FIG. 2 is a plan view of a turning support portion of the device.

FIG. 3 is a front view showing a structure of a turning roller section of a turning support section of the device.

FIG. 4 is an elevational view showing a structure of a plane portion of the device, and is a diagram in which a longitudinal direction is divided into (a) and (b).

FIG. 5 is a side view showing a structure of a joint portion of a pipe ladder of the above device.

FIG. 6 is a plan view showing a connection portion between a plane portion and a turning support portion of the device.

FIG. 7 is a front view showing a connecting portion between a pipe ladder and a horizontal pipe of the device.

FIG. 8 is a side view showing a structure of a plane portion and a three-dimensional portion of the device, and is a diagram in which a longitudinal direction is divided into (a) and (b).

FIG. 9 is an elevation view showing a structure of a three-dimensional part of the device.

FIG. 10 is a front view showing the structure of positions P and Q of the device.

FIG. 11 is an elevational view showing the structure of the upper part of the device.

FIG. 12 is an explanatory view showing a schematic structure of a conventional scaffolding device for inspecting the inside of a spherical tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation support part (bottom structure) 2 Plane part (spherical structure) 3 Solid part (reinforcement structure) 4 Support roller (spherical support member) 11 Pipe (first member) 21 Pipe ladder (second member) 31 triangle forming pipe (third member) 32 connecting pipe (third member) 33 vertex connecting pipe (third member) 100 spherical tank 101 bottom 102 doorway (opening) 103 pipe tower (tubular body)

Claims (2)

(57) [Claims] 1. A spherical tank having a vertical cylindrical body provided at a center portion of a tank bottom, and has a bottom structure, a spherical structure, a reinforcing structure, and a spherical support member. A scaffolding device inside a spherical tank, wherein the bottom structure is formed by coupling a plurality of elongated first members and is supported so as to be rotatable around the cylindrical body; It is formed by the connection of an elongated second member, is connected to the bottom structure, extends along the vicinity of the inner surface of the spherical tank to near the equator, and is perpendicular to the spherical surface at a plurality of positions in the longitude line direction of the spherical tank. The reinforcing structure is formed by combining a plurality of elongate third members to reinforce the spherical upper structure, and the spherical support member contacts the tank inner surface to contact the tank inner surface. Of the connection of the structure on the spherical surface The side structure is supported movably at least in the latitudinal direction of the spherical tank, and the spherical upper structure and the reinforcing structure can maintain the shape integrally when supported by the bottom structure and the spherical support member. A scaffold device inside a spherical tank, which is formed to have rigidity. 2. The scaffolding device according to claim 1, wherein the second member has a ladder-shaped assembly member having planar rigidity.