JP6476749B2 - Cylindrical tank walkway - Google Patents

Description

  The present invention relates to a cylindrical tank walkway having a spherical roof.

  As the above ground type LNG tank and LPG tank, for example, a cylindrical tank having a side wall made of concrete and a spherical roof as an outer tank roof is used.

  In this type of cylindrical tank, a walkway extending in the circumferential direction is generally provided over the entire circumference on the upper side wall of the outer periphery of the spherical roof. As a result, the worker walks along the corridor and inspects equipment and instruments to be inspected.

  The walkway is usually provided with a walkway handrail for preventing the worker from falling on the outer peripheral side of the passage through which the worker passes.

  By the way, in a cylindrical tank having a spherical roof, the snow accumulated on the upper side of the spherical roof slides down along the inclination of the spherical roof during snowfall. Snow that has slipped down the spherical roof may accumulate in the corridors on the outer periphery of the spherical roof. In this way, the snow that accumulates in the corridor is sequentially pushed out toward the outer periphery by the snow newly sliding from the spherical roof.

  Therefore, the walkway handrail provided on the outer periphery of the walkway may receive an outward load due to the snow pushed outward on the walkway. If this load is excessive, the walkway handrail may be damaged. There is.

  In addition, in the cylindrical tank with a spherical roof, as a measure to prevent the occurrence of problems due to snow accumulation on the walkway, the passageway of the walkway is inclined so as to become lower toward the outside. Furthermore, it has been conventionally proposed to move the corridor handrail to a position other than the upright position during snowfall (see, for example, Patent Document 1).

  However, when the walkway handrail is moved to a position other than the upright position during snowfall, the walkway handrail cannot be used as a means for preventing the operator from falling. Therefore, in the thing shown in patent document 1, since it becomes difficult for an operator to go through a corridor at the time of snowfall, it is also difficult to carry out the inspection work of equipment and instruments provided on the spherical roof of the cylindrical tank. Become.

  In addition, if a large amount of snowfall occurs before moving the walkway rail to a position other than the upright position, as described above, the load on the walkway rail is greater than the snow that slides down from the spherical roof and accumulates in the walkway. May receive. Therefore, in this case, it is desired to confirm whether or not the corridor handrail is damaged. However, the work to confirm the soundness of the pedestrian handrail is a work that is performed in an unreliable state that the pedestrian handrail has a function to prevent the operator from falling down. It is difficult to secure means to prevent the person from falling.

  Further, in the technique disclosed in Patent Document 1, there is no idea to prevent the operator from falling when performing the work of moving the walkway handrail to a position other than the upright position or the work of returning the walkway handrail to the upright position. Not shown.

Japanese Patent No. 2974128

  Accordingly, the present invention is intended to provide a cylindrical tank corridor that allows an operator to pass in a state of ensuring safety of falling prevention regardless of the presence or absence of a handrail.

In order to solve the above-mentioned problem, the present invention is a walkway provided in the circumferential direction on the outer periphery of the spherical roof of the cylindrical tank, the upper side of the outer peripheral edge of the spherical roof and the top of the side wall of the cylindrical tank. A walkway body whose upper surface is provided as a passageway, a walkway handrail erected on the outer periphery side of the passageway in the walkway body, and an inner peripheral end portion of the walkway body. a plurality of support pieces provided in sequence on the outer periphery near point of the spherical roof to be near the circumferential direction, a connecting cord whose one end is connected to the respective support piece provided on the outer periphery near point of the spherical roof the corridor is placed so as to extend along the body on the inner circumference near location of the traffic channel, cylindrical with a configuration in which the longitudinal direction of the plurality of locations comprises a lifeline to which are connected to the other end of each connecting cord A tank walkway.

  In the above configuration, the support piece has a plate shape, and the support piece is fixed to the spherical roof in a posture arranged in a plane along the radial direction of the spherical roof.

  Further, in the above-described configuration, the support piece is disposed on a lower surface side of the roof plate at a location that does not overlap a welded joint with another adjacent roof plate in the roof plate constituting the spherical roof. It is set as the structure fixed to the location used as the vicinity of the roof bone to which the roofing board is being fixed.

  Furthermore, in the above-described configuration, the walkway handrail includes a handrail main body that can be erected and a storage portion that stores the handrail main body so as not to protrude into the passage.

  According to the cylindrical tank walkway of the present invention, an operator can pass in a state where safety of falling prevention is ensured regardless of the presence or absence of a handrail.

It is a cutting | disconnection side view which shows one Embodiment of the walkway of the cylindrical tank of this invention. It is an AA direction arrow line view of FIG. It is a schematic plan view of the cylindrical tank provided with the walkway of FIG. It is a cutting | disconnection side view which shows the other form of implementation of this invention. The further another form of implementation of this invention is shown, (a) is a cut side view, (b) is a figure which expands and shows the principal part in (a). FIG. 5 is a schematic plan view of a cylindrical tank including a walkway, showing an application example of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment of a cylindrical tank walkway according to the present invention.

  The cylindrical tank walkway of the present invention (hereinafter abbreviated as the walkway of the present invention) is denoted by reference numeral 1 in FIGS. 1 to 3, and is outside the spherical roof 2 in the cylindrical tank T provided with the spherical roof 2. A corridor body 4 having a passage 4a for the operator a on the upper surface is provided over the entire circumference in the circumferential direction of the cylindrical tank.

  A fixing member 4b is provided at the outer peripheral side position of the passage 4a. The base end side of the walkway handrail 5 in which the plurality of support posts 14 and the crosspieces 15 are combined is fixed to the fixing member 4b. Thereby, the walkway handrail 5 is erected in the outer peripheral side position of the passage 4a. In addition, when the walkway handrail 5 is removed from the fixing member 4b, the standing state with respect to the walkway body 4 is released. The removed pedestrian handrail 5 may be removed or stored, for example, until it is used again.

  Furthermore, a plurality of support pieces 6 are arranged at certain intervals in the circumferential direction at a location near the outer periphery of the spherical roof 2 in the vicinity of the inner peripheral end of the corridor body 4.

  The support piece 6 has a plate shape in which the upper part is semicircular and the lower part is square, and an eye 7 is formed at a location concentric with the upper semicircle.

  The support piece 6 having such a configuration is disposed in a plane along the radial direction of the spherical roof 2, and the lower end edge is fixed to the surface of the roof plate 8 constituting the spherical roof 2 by welding. The support piece 6 is arranged in a plane along the radial direction of the spherical roof 2 so that the support piece 6 does not resist the snow sliding down the spherical roof 2 as much as possible. This is to suppress deformation and damage.

  The fixing part of the support piece 6 in the roof plate 8 is a part that does not overlap with the welded joint between the adjacent roof plates 8, and is arranged on the lower surface side (rear surface side) of each roof plate 8 to fix each roof plate 8. It is set at a location that is in the vicinity of the roof bone 9. As a result, the roof plate 8 is usually formed of a steel plate having a thickness of about several millimeters. Even with the roof plate 8 having such a thickness, the load applied to the support piece 6 is applied to the roof plate 8 itself. This is transmitted to the roof bone 9 in a state in which the bending deformation is suppressed, and can be supported by the roof bone 9.

  A shackle 10 that passes through the eye 7 is attached to each support piece 6. Each shackle 10 is connected to one end of a connecting rope 11 having a certain length.

  A master rope 12 is disposed along the entire length of the corridor body 4 at a location near the inner periphery of the passage 4a. The master rope 12 is connected to the other ends of the connecting ropes 11 at a plurality of longitudinal positions arranged on the outer peripheral side of the support pieces 6.

  Thus, when a load in the outer circumferential direction acts on the master rope 12, the load is transmitted to and supported by the roof plate 8 of the spherical roof 2 via the connecting rope 11, the shackle 10, and the support piece 6.

  Since the master rope 12 and the connecting rope 11 are exposed to the external environment, it is preferable that the rope is a highly weather-resistant rope. As this type of cord-like object, for example, a weather-resistant wire may be used. The master rope 12 and the connecting rope 11 may be removed from the support piece 6 during a period (time) when it is clear that they are not used, and installed when necessary.

  The passage 4a has a surface (upper surface) inclined downward in the radial direction several degrees downward so that the outer peripheral side is lower than the inner peripheral side along the radial direction of the spherical roof 2. This is for improving drainage of the traffic path 4a and for urging the snow that has slipped from the spherical roof 2 to the traffic path 4a during snowfall to be removed to the outer peripheral side of the traffic path 4a.

  The walkway handrail 5 is preferably a handrail of a type that does not include a toe plate. According to this type of walkway handrail 5, when snow is moved to the outer periphery of the passage 4a during snowfall, the toe plate does not hinder the snow, so that snow can be more efficiently removed to the outer periphery of the passage 4a. it can.

  When using the walkway 1 of the present invention having the above configuration, as shown in FIG. 1, the worker a attaches the hook d at the tip of the rope c of the safety belt b attached to the master rope 12 to the master rope 12. Multiply. In this state, the worker a walks along the traffic path 4a.

  When the hook d reaches the connection point of the connecting rope 11 in the longitudinal direction of the master rope 12 as the worker a walks, the worker a temporarily stops walking each time and the hook d is connected to the connecting rope 11. It is re-hanged to the parent rope 12 at a position beyond the connection point, and then walking is resumed.

  Thereby, the worker a who walks along the traffic path 4a is supported by the master rope 12 via the safety belt b, the rope c, and the hook d.

  Further, since the master rope 12 and the connecting rope 11 are smaller in diameter than the diameters of the support pillars 14 and the crosspieces 15 of the walkway handrail 5, even if the master rope 12 and the connecting rope 11 are buried under snow, the operator can remove a part of the master rope 12. By holding and pulling upward, the master rope 12 and the connecting rope 11 can be easily pulled out from under the snow and can be used.

  Thus, according to the walkway 1 of the present invention, the worker a wears the safety belt b and the hook d on the tip side of the rope c is hung on the master rope 12, thereby preventing the worker a from falling. be able to.

  Thereby, when the load of the snow sliding down the spherical roof 2 acts on the walkway handrail 5 during snowfall, the operator a can pass through the passage 4 a without depending on the walkway handrail 5.

  Therefore, the walkway 1 according to the present invention allows the operator a to reach the devices and instruments provided on the spherical roof 2 through the passage 4a even during snowfall. It is possible to carry out inspection work on equipment and instruments.

  Furthermore, in the walkway 1 of the present invention, the worker a can secure the safety of falling by the master rope 12 through the safety belt b, so that the load of snow that has slipped down from the spherical roof 2 to the passage 4a is reduced. When acting on the walkway handrail 5, it is possible to perform an operation of confirming the soundness of the walkway handrail 5.

  Therefore, in the walkway 1 of the present invention, the operator a can pass in a state where safety of falling prevention is ensured regardless of the presence or absence of the walkway handrail 5.

  In the above-described embodiment, the configuration in which the walkway handrail 5 is fixed to the walkway body 4 via the fixing member 4b has been described. The walkway handrail may be, for example, a walkway handrail 5a as illustrated in FIG. (A) As with the walkway handrail 5b as shown in (b), a handrail main body 13 that can be more easily switched between a standing state and a state where the standing state is released is provided, and the standing state is released. It is good also as a structure provided with the accommodating part which accommodates the handrail main body 13. FIG.

  That is, FIG. 4 shows another embodiment of the present invention. In the same structure as shown in FIGS. 1 to 3, a walkway handrail 5a having a rotatable storage handrail body 13 is provided.

  The handrail main body 13 is composed of two or more pillars 14 and laterally extending bars 15 that are arranged in a plurality of upper and lower stages between the pillars 14 and both ends are attached to the pillars 14. . In addition, each support | pillar 14 is set so that a certain dimension may become longer than the height dimension required for the corridor handrail 5a.

  On the surface of the passage 4a, a handrail storage groove 16 having a depth corresponding to the diameter of the column 14 and the crosspiece 15 of the handrail main body 13 is provided as a storage portion of the handrail main body 13.

  Further, a hollow column insertion pipe 17 having an inner diameter larger than the outer diameter of the column 14 is embedded in a portion near the outer periphery of the corridor body 4.

  The hollow column insertion tube 17 has a length sufficient to support the handrail body 13 in a standing state with the lower end of the column 14 inserted when the handrail body 13 is erected.

  The walkway handrail 5a having the above configuration is erected by inserting the lower end portion of each column 14 into the corresponding column insertion pipe 17 and standing. In this state, since the handrail main body 13 is prevented from being tilted, the handrail main body 13 exhibits a function of preventing the operator passing through the passage 4a from falling.

  On the other hand, the handrail main body 13 is lifted from the standing state, and after pulling out each support column 14 from the support plug insertion tube 17, the handrail main body 13 is tilted to the passage 4 a side, as shown by the two-dot chain line in FIG. 4. 13 is stored in the handrail storage groove 16. In this state, there is no thing protruding above the passage 4a on the outer peripheral side of the passage 4a. It is assumed that the handrail main body 13 is connected to the walkway main body 4 by a cord-like object (not shown) so as to prevent the handrail main body 13 itself from falling.

  FIGS. 5A and 5B show still another embodiment of the present invention. In the same configuration as shown in FIGS. 1 to 3, a walkway handrail 5b having a vertically retractable handrail body 13 is provided. Is.

  The handrail body 13 has the same configuration as the handrail body 13 shown in FIG. Further, as shown in FIG. 5B, a pin insertion hole 18 penetrating inward and outward (radial direction of the corridor 1) is provided at a position near the lower end of each column 14.

  As shown in FIG. 5 (a), on the outer peripheral surface of the concrete side wall 3 that is the outside of the walkway main body 4, the entire handrail main body 13 is inserted from the upper end opening 19a as a storage portion for the handrail main body 13, as shown in FIG. A storable handrail storage container 19 is provided. The handrail storage container 19 has an inner dimension in a direction along the radial direction of the spherical roof 2 that is larger than the outer diameter of the column 14 of the handrail main body 13.

  On the periphery of the upper end opening 19a of the handrail storage container 19, as shown in FIG. 5 (b), a locking pin storage groove 20 is formed as a notch at a position corresponding to (opposite to) the column 14 of the handrail main body 13. Is provided. Thus, both end portions of the locking pin 21 inserted so as to penetrate the pin insertion hole 18 of the column 14 of the handrail main body 13 can be stored inside the locking pin storage groove 20.

  Further, for example, a stopper (not shown) is provided between the inside of the upper end opening 19 a of the handrail storage container 19 and the support column 14 so that the lower end portion of the support column 14 does not completely come out of the handrail storage container 19. Is desirable.

  In the walkway handrail 5b configured as described above, with the handrail main body 13 pulled up above the handrail storage container 19, the locking pin 21 is inserted into the pin insertion hole 18 of the column 14, and then the handrail main body 13 is lowered. Thus, both end portions of the locking pin 21 are stored inside the locking pin storage groove 20. In this state, in the walkway handrail 5b, the handrail body 13 is erected so as to protrude upward from the passage 4a of the walkway 1. In this state, since the handrail main body 13 is prevented from being tilted, the handrail main body 13 exhibits a function of preventing the operator passing through the passage 4a from falling.

  On the other hand, the handrail main body 13 is lifted from the standing state, and the locking pin 21 is extracted from the pin insertion hole 18 of the support column 14 and then lowered into the handrail storage container 19. As indicated by the chain line, the handrail body 13 is stored in the handrail storage container 19. In this state, there is no thing protruding above the passage 4a on the outer peripheral side of the passage 4a.

  Therefore, both the walkway 1 of the embodiment shown in FIG. 4 and the walkway 1 of the embodiment shown in FIGS. 5A and 5B are provided in the storage portions of the walkway handrails 5a and 5b during snowfall. The handrail main body 13 can be stored. For this reason, it is possible to prevent damage to the walkway handrail 5a and the walkway handrail 5b due to snow that slides down the spherical roof 2 and accumulates in the passage 4a during snowfall.

  In addition, the snow that has slipped down the spherical roof 2 and reached the passage 4a during snowfall can pass through the passage 4a and be urged to fall to the outer peripheral side.

  Furthermore, in the walkway 1 of the embodiment shown in FIG. 4 and the walkway 1 of the embodiment shown in FIGS. 5A and 5B, even if the handrail main body 13 is stored, FIG. Similar to the embodiment of FIG. 3, the worker a can pass through the passage 4 a in a state where safety is ensured to prevent falling by the master rope 12 and the safety belt b (see FIG. 1).

  Therefore, even when it is snowing, the operator a can pass through the passage 4a and reach the equipment and instruments provided on the spherical roof 2, so that the equipment and instruments are inspected. Can do.

  Furthermore, in the walkway 1 of the embodiment shown in FIG. 4 and the walkway 1 of the embodiment shown in FIGS. 5A and 5B, the worker a falls by the master rope 12 through the safety belt b. With the prevention of ensuring safety, the work of standing the handrail main body 13 or the work of releasing the standing state of the handrail main body 13 and storing it in the storage portion can be performed.

  By the way, when the cylindrical tank T is provided in an area where wind (seasonal wind) in a substantially fixed direction is blown, such as a direction from the sea side to the mountain side, for example, during snowfall, the cylindrical tank T There is a tendency that snow does not easily accumulate in the semicircular portion on the upstream side in the wind blowing direction of the spherical roof 2, while snow tends to accumulate in the semicircular portion on the downstream side in the wind blowing direction.

  Therefore, as an application example of the walkway 1 of the present invention, as shown in FIG. 6, when the direction of the wind blowing in the area where the cylindrical tank T is provided during the snowfall time is almost determined in the direction indicated by the arrow D, The support piece 6, the connecting rope 11, and the master rope 12 may be provided only in the semicircular portion on the downstream side in the wind blowing direction of the spherical roof 2 of the cylindrical tank T.

  Although not shown, in this case, the corridor shown in FIG. 4 is used only in the semicircular portion on the downstream side in the wind blowing direction of the corridor body 4 of the cylindrical tank T, instead of the fixed walkway handrail 5. It is good also as a structure provided with the handrail 5a and the corridor handrail 5b shown to Fig.5 (a) (b).

  In addition, this invention is not limited only to the said embodiment, You may change suitably the number of arrangement | positioning of the direction along the corridor main body 4 of the support piece 6 according to the size of the cylindrical tank T. FIG.

  The support piece 6 may have a shape other than that shown in the figure as long as the support piece 6 is installed on the roof plate 8 and can be connected to one end of the connecting rope 11.

  The walkway 1 according to the present invention is formed with the handrail body 13 in a state where the standing state is released in the passageway 4a as shown in FIG. 4 in order to eliminate the protrusions on the passageway 4a of the walkway body 4 during the snowfall period. It is good also as a form accommodated in arbitrary storage parts other than the handrail storage groove | channel 16 and the handrail storage container 19 as shown to Fig.5 (a) (b). Alternatively, the pedestrian handrail may be of a type in which the handrail main body 13 is not housed but tilted toward the outer peripheral side of the gallery main body 4.

  In order to illustrate the inclination angle of the spherical roof 2, the thickness of the concrete side wall 3, the cross-sectional shape of the corridor body 4, the width dimension of the passage 4 a, etc., the shape and dimensions of the illustrated ones, and the dimensional ratio between the members However, it does not reflect actual dimensions and ratios.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Walkway, 2 spherical roof, 4 walkway main body, 4a passage, 5, 5a, 5b walkway handrail, 6 support piece, 8 roof plate, 9 roof bone, 11 connection rope, 12 master rope, 16 handrail storage groove (storage part) ), 19 Handrail storage container (storage part), T Cylindrical tank

Claims (4)

A walkway provided circumferentially on the outer periphery of a spherical roof of a cylindrical tank
A walkway body in which the upper surface provided on the upper surface of the upper part of the outer peripheral edge of the spherical roof and the top of the side wall of the cylindrical tank is a passage,
On the outer peripheral side of the passage in the walkway body, a walkway handrail erected in a releasable manner,
A plurality of support pieces provided in sequence on the outer periphery near locations in the circumferential direction of the spherical roof to be near the inner peripheral edge portion of the corridor body,
A connecting rope having one end connected to each of the support pieces provided on the outer periphery of the spherical roof ,
The walkway is arranged so as to extend along the body on the inner circumference near location of the traffic channel, cylinder longitudinal plurality of locations is characterized by comprising a lifeline to which are connected to the other end of each connecting cord Shaped tank walkway. The cylinder according to claim 1, wherein the support piece has a plate shape, and is fixed to the spherical roof in a posture in which the support piece is disposed in a plane along a radial direction of the spherical roof. Shaped tank walkway. The support piece is disposed on the lower surface side of the roof plate at a position where it does not overlap with a welded joint with another adjacent roof plate in the roof plate constituting the spherical roof, and the roof plate is fixed. The cylindrical tank walkway according to claim 1, wherein the cylindrical tank walkway is fixed at a location near a roof bone. 4. The walkway handrail includes a handrail main body that can be erected and a storage portion that stores the handrail main body so as not to protrude into the passage. 5. A cylindrical tank walkway as described in 1.

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