JP2006232330A - Ladder device of floating roof tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ladder device of floating tank which has improved safety and durability so as not to be damaged by a floating, derailment, or twisting under an excessive load applied to a rolling ladder constituting this ladder device when both a floating roof of the floating roof tank is oscillated by either strong wind or earthquake, and a smooth ascending or descending function of the floating roof is also improved in its usual application. <P>SOLUTION: A supporting angle 13 reinforced with a rib member is provided at the outer surface of a rail track 12 in such a way that wheels at the lower end of a rolling ladder 8 constituting a ladder device. There is provided a supporting member 15 integrally formed at a shaft of the wheel and an anti-derailment mechanism formed in such a way that the lower end of the supporting member may be hooked to the supporting angle 13 is provided outside the rail track 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In this invention, when the ladder device provided on the floating roof of the floating roof tank is swung by a strong wind or an earthquake, it is not damaged by receiving an excessive load, and a spark is generated by friction or collision. It relates to a structure that takes safety and durability into consideration.

As shown in FIG. 6, the floating roof tank main body 1 for storing crude oil and other volatile and flammable liquids includes a bottom plate 2 having a circular flat plate, a side plate 3 having a cylindrical shape, and a liquid 4 stored in the side plate 3. It is formed of a floating roof 5 that floats on the surface, a box-like pontoon 6, an elastic sealing device 7, and the like.
A ladder device pivotally supported on the upper end portion of the side plate 3 so as to follow the vertical movement of the floating roof 5 due to increase / decrease of the storage liquid 4 is formed on the upper portion of the floating roof 5, that is, this ladder device is configured. A step-like rolling ladder 8 provided with handrails, treads and the like is installed.
Using this rolling ladder 8, a worker such as an operator or an inspection worker can move up and down from the stage 9 provided at the upper end of the side plate 3 to the upper part of the floating roof 5.
A pair of wheels 10 are attached to the lower end portion of the rolling ladder 8, and the wheels 10 are in contact with a rail mount 11 provided at a predetermined position on the upper surface of the floating roof 5 so as to smoothly rotate and move. Has been.

  The invention of the prior art related to the rolling ladder and the ladder device of the floating roof tank includes the “floating roof type storage tank” disclosed in Japanese Utility Model Publication No. 63-23351 (see Patent Document 1) and Japanese Utility Model Publication No. 1-15669 (see Patent Document 2) There are inventions such as “floating roof type tank” and Japanese Utility Model Publication No. 60-47283 (see Patent Document 3) “floating roof type tank”.

The invention of the “floating roof storage tank” of Patent Document 1 includes a weir plate located immediately below the rolling ladder 4 so that the rolling ladder 4 shown in FIG. As shown in FIG. 4 to FIG. 9, a part of 9 is constituted by a partition wall 13 that is nonflammable and has tiltability or stretchability.

In addition, the invention of the “floating roof type tank” of Patent Document 2 has elasticity on the lower surface and side surface of the ladder 2 main body so that the ladder 2 shown in FIG. The weir plate 4 ′, which is covered with the soft material M and is located immediately below the ladder 2, is formed of the soft material M having elasticity.

Furthermore, in the invention of the “floating roof type tank” of Patent Document 3, the wheel 5 provided at the tip of the movable ladder 3 provided so as to be lowered onto the floating roof 2 shown in FIGS. 1 and 2. However, as shown in FIGS. 3 and 4, a stopper 8 is provided on both end protruding shaft portions 7a of the axle 7 so as not to be separated from the guide rail 6 on the floating roof and to prevent the floating roof itself from being damaged. The stopper 8 is formed by an L-shaped stopper body 10 having a sleeve 9 that is loosely fitted to the axle 7a, and a locking piece 11 that protrudes upward at the tip thereof.

JP-B 63-23351 Reality No.1-15669 Japanese Utility Model Publication No. 60-47283

The floating roof tank shown in FIG. 6 has the side plate 3 and the stored liquid 4 fluctuated due to strong winds and earthquakes in the event of a typhoon or the like, as shown in FIG. When the swaying, the rolling ladder 8 pivotally supported on the upper end of the side plate 3 is twisted by strong wind or swinging as indicated by X in the figure, or the floating roof as indicated by Y in the figure. In some cases, the rolling ladder 8 cannot be used due to damage or breakage of the wheel 10 from the rail mount 11 on the top surface.
Further, there is a concern that the vicinity of the mounting portion of the wheel 10 at the lower end portion of the rolling ladder 8 may generate heat or generate sparks due to friction or contact.

The invention of the “floating roof type storage tank” of Patent Document 1 described above is that a part of the weir plate 9 located immediately below the rolling ladder 4 is used so that the rolling ladder 4 does not damage or spark even if it collides with the weir plate 9. Although it is composed of partition walls 13 that are nonflammable and tiltable or stretchable, the rolling ladder 4 itself is damaged by twisting or breakage when subjected to a strong load due to liquid level fluctuations due to strong winds or earthquakes. May occur.

Further, the invention of the “floating roof type tank” of Patent Document 2 described above is such that the lower surface and the side surface of the ladder 2 main body are made of an elastic soft material M so that the ladder 2 does not collide with the weir plate 4 to generate a spark. The weir plate 4 ′, which is covered and formed immediately below the ladder 2, is formed of an elastic soft material M, but the rolling ladder 4 itself received a strong load due to liquid level fluctuations due to strong winds, earthquakes, and the like. In some cases, there was a concern of causing damage such as twisting or breakage.

Further, in the invention of the “floating roof type tank” of Patent Document 3 described above, the wheel 5 provided at the tip of the movable ladder 3 provided so as to be lowered onto the floating roof 2 is provided from the guide rail 6 on the floating roof. A stopper 8 is loosely fitted on the protruding shaft portion 7a on both ends of the axle 7 so as not to be detached. The stopper 8 has an L-shaped stopper body 10 having a sleeve 9 loosely fitted on the axle 7a, and a tip thereof. The locking piece 11 is formed so as to protrude upward. However, since the depth and width of the teeth of the wheel 5 are small, the wheel 5 is separated from the guide rail 6 by a large horizontal fluctuation or vertical fluctuation of the movable ladder 3. When the stored liquid is swung due to strong winds such as typhoons or earthquakes, the movable ladder 3 is twisted or the locking piece 11 is caught by the guide rail 6 or the flange portion 6a. Or worry about damage There was.
In addition, since the width of the both side flanges 5a of the wheel 5 matches the width of the flange portion 6a of the guide rail 6 and is sandwiched between the left and right sides, the movement of the wheel 5 in the left and right side directions is restricted. Damage may occur due to excessive force, rotation may be impaired due to strong frictional resistance, and smooth movement of the wheel 5 during normal use may be impaired because the stopper 8 restricts free movement. there were.

The object of the present invention has been made in view of the above-described problems of the prior art, and the rolling ladder that constitutes the ladder device when the floating roof and the ladder device of the floating roof tank are swung by strong wind or earthquake. Improves safety and durability so that it will not be damaged due to lift, derailment, twisting, etc. due to excessive load, and smoothness of floating roof during normal use without causing frictional resistance on wheels and mounting members The present invention relates to a ladder device for a floating roof tank that is also designed to improve the ascending / descending function.

The structure of the ladder device of the floating roof tank according to the invention of claim 1 is such that when the rolling ladder constituting the floating roof main body or the ladder device changes due to strong wind or earthquake, the wheel at the lower end of the rolling ladder on the floating roof is A support angle reinforced with a rib material is provided on the outer surface of the rail rail so as not to derail from the rail rail on the floating roof top surface, and a support member formed integrally with the shaft of the wheel is provided, and the lower end portion of the support member is A derailment prevention mechanism formed so as to be hooked on the support angle is provided on the outside of the rail rail.

The structure of the ladder apparatus for a floating roof tank according to the invention of claim 2 is such that the rolling ladder according to claim 1 has durability against bending load and torsion load caused by strong winds or the like. It is formed into a frame structure with an inclined member provided between them to increase the rigidity.

The structure of the ladder device of the floating roof tank according to the invention of claim 1 is such that when the rolling ladder constituting the floating roof main body or the ladder device changes due to strong wind or earthquake, the wheel at the lower end of the rolling ladder on the floating roof is A support angle reinforced with a rib material is provided on the outer surface of the rail rail so as not to be removed from the rail rail on the upper surface of the floating roof, and a support member formed integrally with the wheel shaft is provided, and a lower end portion of the support member Is provided on the outside of the rail rail so that the rail rail and the support angle are integrated by the rib material, so that the rigidity is increased and strong against bending and deformation. Since it has a structure and has freedom to play with respect to the lateral movement of the wheel and support member, the wheel is flexible and smooth during normal use The support member integrated with the wheel shaft is strong and resistant to bending and deformation, and the wheel at the lower end of the rolling ladder even under strong winds or earthquakes. Since the rolling ladder is stabilized without being twisted or subjected to a rotational load, the rolling ladder and the supporting member are not damaged or damaged.
Further, when the rolling ladder fluctuates due to a strong wind or the like, there is no fear of generating a spark and causing a disaster without causing friction, heating, or impact on the support member or the mounting member.

The structure of the ladder apparatus for a floating roof tank according to the invention of claim 2 is such that the rolling ladder according to claim 1 has durability against bending load and torsion load caused by strong winds or the like. Since it is formed into a frame structure with a sloped material between them to increase the rigidity, when the rolling ladder that constitutes the floating roof body or ladder device fluctuates due to strong winds, earthquakes, etc., restoration to the deflection of the frame structure Therefore, the ladder device is not damaged such as twisting or breaking.

An embodiment of the structure of a floating roof tank ladder apparatus according to the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory perspective view showing the vicinity of the lower end of the ladder device.
As shown in FIG. 1, a wheel 10 is provided at the lower end portion of the rolling ladder 8 constituting the ladder apparatus, and the rail 10 is connected to the rail 10 so as to move horizontally and move in the direction of arrow L in the figure. A rail rail 12 is provided on the upper surface of the gantry 11.
Note that illustrations of the handrails on the both sides, the stair-shaped step board, etc. provided in the rolling ladder 8 are omitted.
A support angle 13 having an L-shaped cross section bent downward from the horizontal is provided on the outer surface of the rail rail 12. The L-shaped support angle 13 is provided with a plurality of rib members 17 separated from the rail rail 12 to the support angle 13.
As described above, since the plurality of rib members 17 are provided separately from the rail rail 12 to the support angle 13 to be integrated and reinforced, the rigidity of both the rail rail 12 and the support angle 13 is increased, and bending and deformation are performed. It has a strong structure.
An L-shaped support member 15 attached to the shaft 14 of the wheel 10 is provided so as to enter the support angle 13 from the lower side to the right and left sides, that is, with play.

Part A of FIG. 1 is enlarged and shown in FIG. 2, and will be described in more detail.
On the upper surface of the rail mount 11 located at the lower end of the wheel 10, a rail rail 12 formed of an angle material having a wide L-shaped cross section in the horizontal direction is provided, and the wheel 10 is guided from the outer surface and derailed. It is formed so as to travel smoothly without any problems.
A support angle 13 having an L-shaped cross section bent downward from the horizontal is provided on the outer surface of the rail rail 12, and a cross section U of the lower end portion of the support member 15 attached to the shaft 14 (shown in FIG. 1) of the wheel 10 is provided. The portion of the groove that is bent in a letter shape is formed so as to be hooked on the support angle 13 with a space from the bottom, that is, with play.

As shown in FIGS. 1 and 2, the support member 15 moves horizontally along the support angle 13 as the wheel 10 of the rolling ladder 8 rotates on the rail rail 12 (shown in the direction of arrow L in FIG. 1). To do. At this time, the wheel 10 and the support member 15 of the rolling ladder 8 move because the rail rail 12 and the support angle 13 have play in the lateral direction (shown in the direction of arrow W in FIGS. 1 and 2). There is a degree of freedom, and the rolling ladder 8 moves up and down smoothly following the lifting and lowering of the floating roof without receiving excessive force to the left and right.
Furthermore, even if the floating roof or the rolling ladder 8 swings due to strong winds or earthquakes, the wheel 10 does not come off from the rail rail 12, and the rolling ladder 8 receives a bending load and may be twisted or damaged. Absent.
Further, when the rolling ladder 8 fluctuates due to strong winds or the like, the rail rail 12 and the support angle 13 are free to play in the left and right side directions as described above. There is no fear of generating a spark and causing a disaster without causing friction, heating, or impact between adjacent members.

FIG. 3 is a perspective explanatory view showing an embodiment of the support member 15.
The support member 15 is formed by pressing or rolling (shown in FIGS. 1 and 2) a mounting member 15a suspended in a long arm shape, a bottom horizontal groove-shaped guide member 15b, and a hook member 15c rising vertically. 3 and FIG. 4, it is formed into an integral structure by welding or the like.
The support member 15 is rotatably fixed to the shaft 14 (indicated by an arrow O in the drawing) through an attachment hole 16 provided in the vicinity of the upper end of the attachment member 15a. The tip of the hook member 15c that rises vertically from the groove-shaped guide member 15b below the support member 15 rotates smoothly with the rotation indicated by the arrow O (shown by the arrow P in the figure). It is formed in the semi-disc shaped hook member 15c so as not to receive frictional resistance when contacting the member.
Further, in order to increase the bending strength of the integrally formed support member 15, a reinforcing rib member 18 is provided on the outer surface of the mounting member 15a as necessary.

FIG. 4 shows a case where the covering members 19 and 20 are provided on the support member 15.
The covering material 19 is formed by a cylindrical bush 19 a that is attached to the attachment hole 16 of the support member 15 to protect the outer surface of the shaft 14, and a flat ring-shaped presser plate 19 b that covers the outer periphery of the attachment hole 16. .
When the covering material 19 is provided in the mounting hole 16 in this way, the contact with the shaft 14 is relaxed and protected smoothly.
Further, the covering member 20 includes a thin plate member 20a covering the inner surface of the support member 15 from the inner surface of the mounting member 15a to the upper surface of the guide member 15b and the groove member extending from the inner surface of the hook member 15c, and the bottom portion from the side end surface of the guide member 15b. It forms with the thin plate material 20b which coat | covers a lower surface. Thus, the covering material 20 provided on the support member 15 cushions and protects against contact and impact with the support angle 13.

The covering materials 19 and 20 are formed of a soft member such as a non-ferrous metal material such as copper or aluminum that does not generate heat or spark even when it collides with a member such as a surrounding steel material.
As described above, when the covering members 19 and 20 made of the non-ferrous metal member are provided at the attachment portion of the support member 15 and the place where the support angle 13 is brought into contact, the floating roof body or the ladder device is configured by strong wind or earthquake. When the rolling ladder 8 to be moved fluctuates, heat and sparks are not generated due to friction or collision with the attachment portion of the support member 15 to the shaft 14 and members around the support angle 13, so that a disaster such as a fire Can be prevented.

FIG. 5 shows a frame structure 21 that reinforces the lower part of the main body of the rolling ladder 8 and improves rigidity.
22 and 22 are side frame members provided on both side surfaces of the frame structure 21, 23 is a partition member provided orthogonally between the side frame members 22 and 22, and 24, 24 a and 24 b are between the side frame members 22 and 22. It is an inclined material that crosses and passes.
The inclined member 24a corresponds to the rotation in the direction of the arrow Q in the figure, and the inclined member 24b is restored in response to the rotation in the direction of the arrow R in the figure. Therefore, the torsional rigidity and the resilience to the deflection of the frame structure 21 are improved. Increased durability.
By forming the frame structure 21 in this way, the bending rigidity and torsional rigidity of the rolling ladder 8 are improved, so that when the rolling ladder 8 constituting the floating roof body or the ladder device is changed due to a strong wind, an earthquake, or the like. No damage such as twisting or breakage occurs in the ladder device.

The floating roof tank ladder device according to the present invention is not only applied to a newly installed floating roof tank ladder device, but also includes a reinforcing member such as a simple support angle or a support member for an existing floating roof tank ladder device. By remodeling and repairing the structure, it is possible to obtain a ladder device structure that is excellent in durability and safety against strong winds and earthquakes.

It is an isometric view explanatory drawing which shows the lower end part vicinity of the rolling ladder which comprises the ladder apparatus of the floating roof tank which concerns on this invention. It is a longitudinal cross-sectional explanatory drawing which expands and shows the A section of FIG. It is a perspective explanatory view showing a support member. It is perspective explanatory drawing which provided the coating | covering material in the supporting member. It is explanatory drawing which shows the framework structure of a rolling ladder lower part. It is longitudinal cross-sectional explanatory drawing which shows the floating roof type tank of a prior art example. FIG. 7 is a perspective explanatory view showing a state where the rolling ladder of the conventional floating roof type tank shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floating roof tank main body 2 Bottom plate 3 Side plate 4 Storage liquid 5 Floating roof 6 Pontoon 7 Sealing device 8 Rolling ladder 9 Stage 10 Wheel 11 Rail mount 12 Rail rail 13 Support angle 14 Shaft 15 Support member 15a Mounting member 15b Guide member 15c Hook member 16 Mounting hole 17 Rib material 18 Reinforcing rib material 19 Cover material 19a Bush 19b Holding plate 20 Cover material 20a Thin plate material 20b Thin plate material 21 Frame structure 22 Side frame material 23 Partition material 24 Slope material 24a Slope material 24b Slope material

Claims (2)

When the rolling ladder that makes up the floating roof body or ladder device changes due to strong winds or earthquakes, the rail rails should not be removed from the rail rail on the upper surface of the floating roof. A support angle reinforced with a rib material is provided on the outer surface, a support member integrally formed with the wheel shaft is provided, and a derailment prevention mechanism formed so that a lower end portion of the support member is hooked on the support angle is provided on the rail rail. A ladder apparatus for a floating roof tank, which is provided outside. Rigidity is increased by forming a frame structure in which an inclined material is provided between the side frames of the rolling ladder so that the rolling ladder has durability against bending load and torsional load due to strong wind or the like. The ladder apparatus for a floating roof tank according to claim 1.