JP2014101642A - Installation method of safety balustrade for working - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method of a safety balustrade for working which can be applied to a high steel girder in such a height that work on an upper flange becomes high-place work, while being placed on the ground, is capable of safely performing work for installing the steel girder onto the upper flange, and further, is unlikely to violate a height limitation in the case of transportation even when the safety balustrade for working is transported while being mounted to the steel girder.SOLUTION: In a method of installing a safety balustrade 10 for working to a steel girder 50, the steel girder 50 has such a height that work on an upper flange 50A becomes high-place work even in the state where the steel girder 50 is placed on the ground, and the safety balustrade 10 for working is foldable and comprises a clamp 12 which can be freely attached to and detached from the upper flange 50A of the steel girder 50. The installation method includes a mounting step of mounting the safety balustrade 10 for working onto the upper flange 50A of the steel girder 50 along a length direction of the steel girder 50 by means of a clamp 12, and the mounting step is implemented in a manufacture plant of the steel girder.

Description

  The present invention relates to a work safety handrail, and in particular, a work safety handrail attached to a high steel girder so that the work on the upper flange becomes a work at a high place even when placed on the ground. About.

  In addition, the height work in this specification means not only work in a height environment of 2 m or more based on the definition in the occupational safety and health regulations, but also use a safety belt in a height environment of less than 2 m. It is a concept that includes work in a height environment where it is preferable to work after taking measures.

  When the upper flange of a steel girder is used as a work passage, a handrail or a master rope facility is required at the edge. Conventionally, when attaching a safety handrail for work to the edge of the upper flange of a steel girder, the work safety handrail was attached to the upper flange of a steel girder by placing it on the ground at the construction site where the steel girder was installed. .

  Here, if the upper flange surface of the steel girder exceeds 2 m from the ground, even if the steel girder is placed on the ground before being lifted on the pier, work on the upper flange of the steel girder Therefore, when working on the upper flange of the steel girder, it is necessary to take measures for working at high places.

  When attaching the work safety handrail to the upper flange of the steel girder, specifically, the worker first climbs up to reach the upper flange of the steel girder using a ladder, At the girder manufacturing factory (hereinafter sometimes referred to simply as “manufacturing factory”), the safety band is attached to the suspension piece that has been attached to the steel girder in advance, and the column with clamp is placed on the steel girder by the worker. Attach and fasten to the flange, then attach the master rope to a clamped post fixed to the upper flange of the steel girder, the worker climbs on the upper flange of the steel girder, and on the upper flange of the steel girder The worker who climbed to the position attached a handrail between the columns with clamps fixed to the upper flange of the steel girder, and installed the work safety handrail on the upper flange of the steel girder.

  Thus, the work of attaching the work safety handrail to the upper flange of the steel girder in the field is dangerous work, especially when the steel girder is placed on the ground before being lifted on the pier. When the upper flange surface of the girder exceeds 2 m from the ground and becomes an altitude work according to the occupational safety and health regulations, it is necessary to take sufficient measures against the altitude work.

  On the other hand, if an aerial work vehicle is used, it is possible to safely install a work safety handrail, but this requires equipment costs.

  For this reason, in a steel girder manufacturing plant that is well equipped and always has an aerial work vehicle, it is desirable to attach a safety handrail to the upper flange of the steel girder and bring it into the field in that state. It was.

  However, if a safety handrail is attached to a high steel girder that is particularly desired to be installed at a manufacturing plant, it often violates the height limit during transportation. It was difficult to attach work safety handrails to high steel girders at the manufacturing plant.

  An invention described in Patent Document 1 is an invention that is likely to provide a clue for solving such a problem. Patent Document 1 describes an invention in which a handrail is safely installed on a beam immediately after the assembly of a column and a beam is completed and there is no floor around the beam.

  Specifically, as shown in FIG. 10 (FIG. 1 of Patent Document 1), a plurality of fixing pieces 102 are fixed on the upper flange of the beam 101 in two rows in the longitudinal direction of the beam 101 at a predetermined pitch. The invention is described in which the base 104 of the column 103 of the handrail 108 is disposed between the two rows of fixed pieces 102 and attached. Here, reference numeral 105 denotes a shaft provided at the lower end of the column base 104, and the column 103 is rotatable in the longitudinal direction of the beam 101 when the shaft 105 is fitted into a hole (not shown) of the fixed piece 102. Reference numeral 106 denotes a handrail attachment plate that is rotatably attached to the upper end of the support post 103 by a shaft 107 in the same plane as the support post 103. Reference numeral 109 denotes a holding screw attached to the handrail attachment plate 106. To fix. The handrail 108 and the column 103 can be folded as shown in FIG. 11 (FIG. 3 of Patent Document 1).

  In this invention, the handrail 108 and its column 103 are attached to the beam 101 before the beam 101 is lifted. When the beam 101 is lifted, the handrail 108 and its column 103 are folded so that the center of gravity is not raised, When the beam 101 is attached, it is difficult for the beam 101 to tilt, and after the beam 101 is attached to the column, as shown in FIG. 11, one end of the handrail 108 is caused from a place with a good footing in the vicinity of the column. Thus, the handrail 108 can be safely installed on the beam 101 to ensure the safety of the worker.

  However, the invention described in Patent Document 1 is a technique that eliminates the work at a high place by attaching a handrail to a beam placed on the ground. In other words, the work of attaching a handrail to a beam placed on the ground is a work at a high place. This technology cannot be applied to steel girders that are so high that the work on the upper flange becomes a work at a high place when placed on the ground.

JP-A-62-178657

  The present invention has been made in view of such problems, and is applied to a steel girder having a high height such that the work on the upper flange becomes a work at a high place when placed on the ground. It can be installed safely on the upper flange of the steel girder, and even if it is transported while attached to the steel girder, it does not conflict with height restrictions during transportation. It is an object to provide a safety handrail.

  This invention solves the said subject with the following safety handrails for work.

  That is, the work safety handrail according to the present invention is a work safety handrail attached to the upper flange of the steel girder, and the steel girder can be operated on the upper flange even when placed on the ground. The work safety handrail is attached in the longitudinal direction of the steel girder on the upper flange in the steel girder manufacturing factory, and is foldable. In addition, the work safety handrail includes a clamp detachably attached to the upper flange of the steel beam, and is attached to the upper flange of the steel beam by the clamp.

  Here, as described above, the high-altitude work uses a safety belt not only for work in a height environment of 2 m or more based on the definition in the occupational safety and health rules, but also in a height environment of less than 2 m. It is a concept including work in a high environment where it is preferable to work after taking such measures.

  When a steel girder is temporarily placed on the ground at a construction site, it is often placed on a table with a height of about 0.5 m, so a steel girder with a height of 1.5 m or more is temporarily placed on the ground at a construction site. In many cases, the work of attaching the handrail to the upper flange is a work at a high place in accordance with the occupational safety and health regulations.

  When the width of the upper flange in the direction orthogonal to the longitudinal direction of the steel beam is wide (when the width of the upper flange is specifically 1 m or more, for example), the direction in the direction orthogonal to the longitudinal direction of the steel beam By attaching the work safety handrail to both ends of the upper flange, the safety when using the upper flange as a work passage can be further improved.

  Specifically, the safety handrail for work includes, for example, two or more columns and one or more horizontal rails, and the columns and the horizontal rails are bolts at the intersections of the columns and the horizontal rails. And the bolts and nuts are connected so that the bolts and nuts can be tightened so that the columns and the horizontal rails can be rotated, and can be folded and raised. Yes.

  When the work safety handrail has a fixing member fixed to the upper flange of the steel girder by the clamp, and the lower end of the column is fixed to the fixing member by a plurality of sets of bolts and nuts. Leave only one set of bolts and nuts out of the plurality of sets of bolts and nuts, and remove the other bolts and nuts to rotate the support column with the remaining bolts as the central axis of rotation. The working safety handrail can be folded and raised.

  The work safety handrail has a fixing member fixed to the upper flange of the steel beam by the clamp, the lower end portion of the column is connected to the fixing member by a set of bolts and nuts, and the column When the diagonal member that connects the intersection of the horizontal beam and the upper flange of the steel girder is provided, the connection of one end of the diagonal member is released, so that the safety handrail can be folded and raised. Can be woken up.

  Here, the diagonal material is a rod-shaped member whose angle between the longitudinal direction of the steel beam and the longitudinal direction of the steel beam is less than 90 degrees, and the angle between the longitudinal direction of the diagonal material and the horizontal plane is 45, for example. It can be set to 60 degrees or more.

  It is preferable to mechanically connect adjacent ones of the horizontal rails in terms of improving safety as a handrail.

  Here, “mechanically connecting adjacent ones of the horizontal rails” is not only directly connecting the adjacent horizontal rails but also indirectly via other members. It is a concept that includes cases of connection.

  In the case where the horizontal rail is tubular and further includes a connecting single pipe connecting the adjacent horizontal bars among the horizontal bars, one end of the connecting single pipe is connected to one of the adjacent horizontal bars. The other one of the horizontal bars can be mechanically connected by mechanically connecting the other end of the connecting single pipe to the other of the adjacent horizontal bars.

  Here, “inserting one end of a connecting single pipe into one of the adjacent horizontal bars” means that the outer diameter of the connecting single pipe is smaller than the inner diameter of one of the adjacent horizontal bars, and the connecting single pipe Is not only inserted inside one of the cross rails, but also the inner diameter of the connecting single pipe is larger than the outer diameter of one of the adjacent cross bars, and one of the cross bars is inserted inside the connecting single pipe. It is a concept that includes cases where

  Further, when there is an overlapping portion when the adjacent ones of the horizontal rails are viewed from a direction orthogonal to the longitudinal direction of the horizontal rail, the adjacent horizontal rails are mechanically replaced by the overlapping portions. Can be linked to.

  In addition, it further includes a connecting member that connects adjacent horizontal rails, and when there is no overlapping portion when the adjacent ones of the horizontal rails are viewed from a direction orthogonal to the longitudinal direction of the horizontal rails, One end of the connecting member is mechanically connected to one of the adjacent horizontal bars, and the other end of the connecting member is mechanically connected to the other of the adjacent horizontal bars, thereby Can be mechanically connected to each other.

  The work safety handrail according to the present invention is mounted on the upper flange of the steel girder at the steel girder manufacturing factory and can be folded. Therefore, the work safety handrail is folded when used as a work safety handrail in the field. Since it only needs to be raised and fixed from the state, a safety handrail for work is provided on the upper flange of the high steel girder so that the work on the upper flange becomes a work at a high place when placed on the ground. Even in such cases, it is possible to greatly reduce the work at high places on the site for the installation of safety handrails for work, and the work content can be made simple. The safety of the installation work of the safety handrail can be greatly improved. Also, the work time at the site for installing the work safety handrail can be greatly reduced.

  Further, the work safety handrail according to the present invention includes a clamp that is detachable with respect to the upper flange of the steel girder, and is attached to the upper flange of the steel girder by the clamp, so that the work safety handrail is unnecessary. In this case, the work safety handrail can be easily removed simply by releasing the fixing by the clamp, and the removed work safety handrail can be used again at another site.

  In addition, when transported by attaching to a steel girder, the height restriction during transportation can be easily satisfied by lowering the height in the folded state.

The figure which looked at the safety handrail for work which concerns on embodiment of this invention from the longitudinal direction (longitudinal direction of a cross beam) of the steel beam 1 arrow view of FIG. The figure which looked at the crosspiece 16A from the longitudinal direction The figure which looked at the crosspiece 16B from the longitudinal direction A view of the safety handrail 10 in a folded state as viewed from the horizontal direction perpendicular to the longitudinal direction of the crosspiece 16 It is a figure for demonstrating the case where the adjacent crosspieces 16 are connected using the connecting single pipe 30, (A) is the figure which looked at the connecting single pipe 30 from the direction orthogonal to the longitudinal direction, (B) is the figure which looked at the edge part of the adjacent horizontal beam 16 before connecting from the horizontal direction orthogonal to the longitudinal direction of the horizontal beam 16, (C) is the single tube 30 for connecting adjacent horizontal beams 16 FIG. 6D is a view of the state after being connected at the horizontal direction perpendicular to the longitudinal direction of the horizontal crosspieces 16, and (D) shows the state after connecting the adjacent horizontal crosspieces 16 with the connecting single pipe 30 downward in the vertical direction. Viewed in The figure which looked at the site | part of the adjacent crosspieces 16 connected with the universal clamp 34 vertically downwards. The figure which looked at the site | part of the adjacent crosspieces 16 connected with the two universal clamps 36 and the single tube 38 for connection downwards perpendicularly | vertically. The figure which looked at the safety handrail 60 for work which is a modification of embodiment of this invention from the horizontal direction orthogonal to the longitudinal direction of the crosspiece 16 The figure which looked at the handrail of patent documents 1 from the longitudinal direction (the 1st figure of patent documents 1) The figure which shows the state which folded and raised the handrail of patent document 1 (FIG. 3 of patent document 1)

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view of a work safety handrail according to an embodiment of the present invention as viewed from the longitudinal direction of a steel girder (longitudinal direction of a cross beam), and FIG. 2 is a view taken in the direction of arrow A in FIG.

  The work safety handrail 10 according to the present embodiment includes a clamp 12, a column 14, and a crosspiece 16, and both ends of the upper flange 50 </ b> A of the steel beam 50 (longitudinal direction of the steel beam 50) by the clamp 12. Are attached to and fixed to “both ends of the upper flange 50A”). That is, the work safety handrail 10 is arranged in two rows along both end portions of the upper flange 50A of the steel girder 50, so that the upper flange 50A of the steel girder 50 can be suitably used as a work passage. It has become. However, in FIG. 1 and FIG. 2, only one work safety handrail 10 of the work safety handrails 10 arranged in two rows is illustrated for convenience of illustration. In addition, the description of the constituent members of the work safety handrail 10 described below will be made while paying attention to only one of the work safety handrails 10, but the other work safety handrail 10 is also composed of similar constituent members.

  Note that the steel girder 50 has such a height that the work on the upper flange 50A becomes a work at a high place even when placed on the ground (specifically, for example, a height of 1.5 m or more). However, the work safety handrail 10 is attached to the upper flange 50A of the steel girder 50 at the production factory of the steel girder 50, and is safely attached in an environment equipped with facilities such as an aerial work vehicle.

  The clamp 12 includes a tightening portion 12A and a column portion 12B.

  The fastening portion 12A of the clamp 12 has a role of fastening the upper flange 50A of the steel girder 50 in the thickness direction and fixing the work safety handrail 10 to the steel girder 50. If it can play this role, the shape and mechanism of the tightening portion 12A are not particularly limited.

  The column part 12B of the clamp 12 is formed of a square steel pipe, and an upper hole 12C and a lower hole 12D are formed in two upper surfaces of the column part 12B facing each other in the direction orthogonal to the cross rail 16 respectively. It has been. The upper hole 12C opened in each of the two side surfaces is positioned at the same height and is opposed horizontally, and the lower hole 12D opened in each of the two side surfaces is also the same height. Located and facing horizontally. Therefore, the bolt 18 can pass through the two upper holes 12C facing each other, and the bolt 20 can pass through the two lower holes 12D facing each other. For this reason, as will be described later, the bolt 14 is inserted into the hole 14B provided in the lower end portion of the support column 14 with the position of the upper hole 12C on the upper end portion of the clamp 12 and tightened with the nut 18A. The pillar 14 can be fixed to the pillar portion 12B of the clamp 12 by inserting the bolt 20 in accordance with the position of the lower hole 12D on the upper end portion of the clamp 12 and tightening with the nut 20A. .

  In this embodiment, a square steel pipe is used for the column portion 12B of the clamp 12, but the shape of the column portion 12B is not limited to this, and the column 14 can be safely fixed to the column portion 12B of the clamp 12. For example, a cylindrical steel pipe may be used.

  The support column 14 is made of angle steel, and a side surface 14A parallel to the longitudinal direction of the crosspiece 16 is provided with a hole 14B at its lower end corresponding to the upper hole 12C of the upper end of the clamp 12, A hole 14 </ b> C is formed corresponding to the lower hole 12 </ b> D on the upper end of the clamp 12. Further, a hole 14D for attaching the horizontal rail 16 with a bolt 22 is formed in the upper end portion of the side surface 14A, and a hole 14E for attaching the horizontal rail 16 with a bolt 24 is formed in an intermediate portion of the side surface 14A.

  The hole 14B at the lower end of the side surface 14A of the support 14 is aligned with the hole 12C at the upper end of the clamp 12 so that the bolt 18 penetrates, and the hole 14C at the lower end of the side 14A of the support 14 is clamped. 12 is inserted into the lower hole 12D of the upper end portion 12 so that the bolt 20 penetrates. The inserted bolts 18 and 20 are tightened by nuts 18A and 20A, respectively, and the column 14 is the column portion 12B of the clamp 12. It is fixed to. In this fixed state, as shown in FIG. 2, the work safety handrail 10 is raised. In FIG. 2, in the column portion 12 </ b> B and the column 14 of the clamp 12 on the left side, holes 12 </ b> C, 12 </ b> D, 14 </ b> B, 14 </ b> C, 14 </ b> D, 14 </ b> E and holes formed in the horizontal rail 16 described later are formed. For convenience of illustration of 16C and 16D, bolts and nuts are not drawn.

  In the present embodiment, angle steel is used for the support column 14, but the shape of the support column 14 is not limited to this, and a square steel pipe may be used as long as it can stably support the cross rail 16.

  The crosspiece 16 is a cylindrical steel pipe and is provided in two upper and lower stages in the direction along the longitudinal direction of the steel girder 50. It is directly recognized that an operator passing over the upper flange 50A of the steel girder 50 falls down. It has a role of preventing safety and ensuring safety.

  The upper horizontal rail 16A has two holes 16C that are opposed to each other in a direction perpendicular to the longitudinal direction thereof, as shown in FIG. 3 (a view of the horizontal rail 16A viewed from the longitudinal direction). The bolts 22 are inserted so as to pass through the two holes 16C and the hole 14D at the upper end of the side surface 14A of the column 14, and tightened by the nut 22A, so that the upper horizontal rail 16A is fixed to the column 14.

  The lower horizontal rail 16B has two holes 16D that are opposed to each other in a direction perpendicular to the longitudinal direction thereof, as shown in FIG. 4 (a view of the horizontal rail 16B viewed from the longitudinal direction). The bolts 24 are inserted so as to penetrate through the two holes 16D and the hole 14E in the middle of the side surface 14A of the column 14, and are tightened by the nuts 24A, so that the lower horizontal rail 16B is fixed to the column 14.

  In the present embodiment, a cylindrical steel pipe is used for the horizontal rail 16. However, the shape of the horizontal rail 16 is not limited to this, and may be a square steel pipe or the like as long as it can function as a safety handrail. You may use a shape steel and a steel plate.

  The main components of the work safety handrail 10 according to the present embodiment have been described above. Next, the operation for folding the work safety handrail 10 and the operation for raising the work safety handrail 10 will be described.

  FIG. 5 is a view of the work safety handrail 10 in a folded state as viewed from the horizontal direction orthogonal to the longitudinal direction of the horizontal rail 16.

  In order to change the working safety handrail 10 from the upright state shown in FIG. 2 to the folded state shown in FIG. 5, the nut 20A is removed and the bolt 20 penetrating the holes 12D and 14C is removed, and the bolt The nuts 18A, 22A, and 24A tightening the bolts 18, 22, and 24 are loosened, and the support column 14 is rotated about the bolt 18 to be in the folded state shown in FIG. In the state where the work safety handrail 10 attached to the steel girder 50 is raised as shown in FIG. 2, even if the height girder violates the height limit during transportation of the steel girder 50, the folded state shown in FIG. It may be possible to meet the restrictions.

  The height of the steel girder 50 to which the work safety handrail 10 is attached is a height at which the work on the upper flange is a high place work even when the work girder 50 is placed on the ground at the construction site. Normally, a steel girder is temporarily placed on a stand of about 0.5 m above the ground at the construction site. Therefore, if the height of the steel girder 50 reaches 1.5 m or more, the steel girder is placed on the ground at the construction site. Often, the top of the girder exceeds 2.0m, which is a work at a height under the occupational safety and health regulations. Therefore, the work safety handrail 10 according to the present embodiment is particularly effective when it is attached to a steel girder having a height of 1.5 m or more.

  When transporting in the folded state shown in FIG. 5, if the nuts 18A, 22A, and 24A are tightened, rattling that occurs during transportation can be suppressed. Before the steel girder 50 is lifted on the pier and mounted on the ground at the site, the nuts 18A, 22A, 24A are loosened and the column 14 is rotated about the bolt 18 as shown in FIG. It is possible to use the work safety handrail 10 as a handrail simply by raising the bolt 20 through the holes 12D and 14C and tightening the nut 20A and tightening the nuts 18A, 22A and 24A.

  As described above, by using the work safety handrail 10 according to the present embodiment, the work of providing the work safety handrail on the upper flange 50A of the steel girder 50 temporarily placed on the ground of the installation site is a high place work. However, it is possible to safely install the work safety handrail on the upper flange 50A of the steel beam 50. Also, the work time for installing the work safety handrail can be greatly reduced.

  Also, since the work safety handrail 10 can be used as a handrail (the upright state shown in FIG. 2), the steel girder 50 is hung on the pier and installed, so that it is far away after installation. The installation work of the work safety handrail 10 is unnecessary.

  Here, even when the steel girder 50 is placed on the ground, the steel girder 50 has a height at which the work on the upper flange 50A becomes a work at a high place (specifically, for example, a height of 1.5 m or more). Therefore, when the work safety handrail 10 can be used as a handrail (the upright state shown in FIG. 2) and then lifted on the pier, the center of gravity of the steel girder 50 is increased and tilted. Is unlikely to occur. On the other hand, the handrail described in Patent Document 1 (Japanese Patent Application Laid-Open No. 62-178657) is folded when the beam is lifted to prevent the beam to which the handrail is attached from being tilted when the beam is lifted. It is necessary to keep it in a state.

  In the folded state shown in FIG. 5, the nut 20 </ b> A and the bolt 20 are removed, but instead of removing the nut 20 </ b> A and the bolt 20, the nut 18 </ b> A and the bolt 18 are removed, and the column 14 is pivoted on the bolt 20. The working safety handrail 10 can also be folded.

  The work safety handrail 10 described above includes two columns 14 and two-level horizontal rails 16 (16A and 16B). However, the number of the columns 14 and the horizontal rails 16 is not limited thereto, and The number of 14 may be more than two, and the number of steps of the crosspiece 16 may be one or three or more depending on the situation at the site.

  Next, a method for connecting the work safety handrail 10 in the longitudinal direction of the horizontal rail 16 will be described. By connecting the work safety handrail 10 in the longitudinal direction of the horizontal rail 16, safety as a handrail can be further improved.

  FIG. 6 is a diagram for explaining a case where adjacent crosspieces 16 are connected using a connecting single pipe 30, and FIG. 6A is a direction orthogonal to the longitudinal direction of the connecting single pipe 30. FIG. 6B is a view of the end portion of the adjacent horizontal beam 16 before connection from a horizontal direction orthogonal to the longitudinal direction of the horizontal beam 16, and FIG. 6C is adjacent to FIG. FIG. 6D is a view of the state after the horizontal rails 16 are connected to each other by the connecting single pipe 30 as viewed from the horizontal direction orthogonal to the longitudinal direction of the horizontal rails 16. FIG. It is the figure which looked at the state after connecting with the pipe | tube 30 in the perpendicular direction downward.

  As shown in FIG. 6A, the connecting single tube 30 is opened at two locations so that the holes 30A face each other in the direction orthogonal to the longitudinal direction of the connecting single tube 30 (two facing holes). When 30A is taken as one set, two sets of two opposing holes 30A are opened, and a total of four holes 30A are opened in the connecting single tube 30). Further, as shown in FIG. 6B, holes 16E facing the horizontal direction perpendicular to the longitudinal direction of the horizontal rail 16 are opened at two positions at the end of the horizontal rail 16 (two opposing When one set of the holes 16E is provided, two sets of two opposing holes 16E are opened at each end of the horizontal beam 16, and a total of four holes 16E are opened at each end of the horizontal beam 16. ).

  The outer diameter of the connecting single tube 30 is slightly smaller than the inner diameter of the horizontal rail 16, and the connecting single tube 30 can be inserted inside the horizontal rail 16.

  Adjacent horizontal rails 16 are arranged so as to be displaced in the horizontal direction by their outer diameters, and are adjacent when viewed from the horizontal direction perpendicular to the longitudinal direction of the horizontal rails 16. The end portions of the horizontal rail 16 are arranged with a certain distance therebetween. In this arrangement state, one end of the connecting single pipe 30 is inserted into one of the adjacent horizontal rails 16, and a hole 30 </ b> A opened in the connecting single pipe 30 is inserted into the connecting single pipe 30. The insertion amount of the connecting single pipe 30 is adjusted so as to be aligned with the hole 16E of the horizontal rail 16 not present. Then, the bolts 32 are inserted and tightened with the nuts 32A so as to pass through the holes 16E and 30A, thereby connecting the adjacent horizontal rails 16 to each other as shown in FIGS. 6 (C) and 6 (D). It can be connected via the single pipe 30 for use. Thus, when connecting the adjacent crosspieces 16 via the connecting single pipe 30, only one side of the connecting single pipe 30 is connected with a bolt and a nut, and the other side is only inserted. It becomes.

  In addition, when the crosspiece 16 uses a shape steel or a steel plate, since the connecting single pipe 30 cannot be inserted into the horizontal crosspiece 16, the length of the connecting single pipe 30 is shown in FIG. 6 (A). The holes 30A may be made shorter at both ends, bolts may be passed through the holes 30A at both ends of the connecting single tube 30, and both sides of the connecting single tube 30 may be connected by bolts.

  6 (C) and 6 (D), the adjacent horizontal beams 16 are arranged so as to be shifted in the horizontal direction, but the adjacent horizontal beams 16 are shifted in the vertical direction. In this case, holes are made in the crosspiece 16 and the connecting single pipe 30 so as to face each other in the vertical direction, and bolts are installed in the vertical direction so as to penetrate these holes. The crosspiece 16 and the connecting single pipe 30 are fixed by inserting and tightening with nuts.

  In this embodiment, the outer diameter of the connecting single tube 30 is slightly smaller than the inner diameter of the horizontal rail 16 and one end of the connecting single tube 30 is inserted into the inner side of the horizontal rail 16. The inner diameter of the single tube 30 may be slightly larger than the outer diameter of the horizontal beam 16, and the end of the horizontal beam 16 may be inserted into the inner side of the connecting single tube 30.

  FIG. 7 is a diagram for explaining a case where the adjacent horizontal rails 16 are connected to each other using the universal clamp 34, and is a view in which the portions of the horizontal rails 16 connected by the universal clamp 34 are viewed downward in the vertical direction. It is.

  Adjacent horizontal rails 16 are arranged so as to be shifted in the horizontal direction by a distance slightly larger than their outer diameter, and the adjacent horizontal rails 16 are viewed from the horizontal direction perpendicular to the longitudinal direction of the horizontal rails 16. At this time, the end portions of the adjacent horizontal rails 16 are arranged so as to overlap each other by a certain distance (overlapping by a distance enough to attach the universal clamp 34 to the overlapping portion). In this arrangement state, it is possible to connect the adjacent horizontal bars 16 by attaching the universal clamps 34 to the overlapping end portions of the adjacent horizontal bars 16.

  In the connecting structure of the horizontal crosspieces 16 shown in FIG. 7, the adjacent horizontal crosspieces 16 are arranged so as to be shifted in the horizontal direction, but the adjacent horizontal crosspieces 16 are arranged so as to be shifted in the vertical direction, and the free clamp 34 is provided. Alternatively, the adjacent horizontal rails 16 may be connected to each other by being attached to the end portions of the adjacent horizontal rails 16 overlapping in the vertical direction.

  FIG. 8 is a diagram for explaining a case where the adjacent cross rails 16 are connected to each other by using two universal clamps 36 and a single connecting pipe 38, and is connected by two universal clamps 36 and a single connecting pipe 38. It is the figure which looked at the site | part of adjacent horizontal crosspieces 16 made perpendicularly downward.

  The adjacent horizontal rails 16 are arranged in a straight line, and when the adjacent horizontal rails 16 are viewed from the horizontal direction perpendicular to the longitudinal direction of the horizontal rails 16, the ends of the adjacent horizontal rails 16 are They are arranged at some distance. In this arrangement state, one universal clamp 36 is attached to the end of one horizontal rail 16 and the connecting single tube 38, and the other universal clamp 36 is connected to the end of the other horizontal rail 16. It can attach to the single pipe 38 and can connect the adjacent crosspieces 16 mutually.

  In the connection structure of the horizontal rails 16 shown in FIG. 8, the adjacent horizontal rails 16 and the connecting single pipe 38 are both in the same horizontal plane, but the connecting single pipe 38 is directly above the adjacent horizontal bars 16 or It is also possible to connect the adjacent horizontal rails 16 with the two universal clamps 36 and the connecting single pipe 38 by arranging them directly below.

  The shape of the connecting single tube 38 is cylindrical, but a shape steel, a steel plate, a square steel tube or the like may be used instead of the connecting single tube 38.

  In FIG. 7, the adjacent horizontal beams 16 are secured using the universal clamp 34, but the adjacent horizontal beams 16 may be secured using a wire instead of the universal clamp 34. In FIG. 8, the horizontal beam 16 and the connecting single tube 38 are secured using the universal clamp 36. However, instead of the universal clamp 36, the horizontal beam 16 and the connecting single tube 38 are fixed. You may tie it up.

  Next, a work safety handrail 60 that is a modification of the work safety handrail 10 according to the present embodiment will be described. The same components as those of the work safety handrail 10 are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 9 is a view of the work safety handrail 60 as seen from the horizontal direction orthogonal to the longitudinal direction of the cross rail 16.

  As shown in FIG. 9, the work safety handrail 60 includes a column portion 12 </ b> B of the clamp 12 and a column 14 connected by one bolt 62 and one nut 62 </ b> A, and an intermediate portion of the column 14 by a diagonal member 64. And the upper flange 50A of the steel girder 50 are connected. Specifically, the diagonal member 64 is fixed at one end by the diagonal member 64 with the bolt 24 and the nut 24A at the intermediate portion of the column 14, and the other end of the diagonal member 64 is fixed to the clamp 66 fixed to the upper flange 50A of the steel beam 50. It is attached by bolts 68. The angle formed by the diagonal member 64 and the longitudinal direction of the steel beam 50 can be set to 45 degrees or more and 60 degrees or less, for example.

  When the work safety handrail 60 is folded, the bolt 68 is removed and the diagonal member 64 is removed from the clamp 66, and the nuts 62A, 22A, and 24A tightening the bolts 62, 22, and 24 are loosened to support the column. By turning 14 around the bolt 62, it can be folded.

  Finally, effects of the work safety handrails 10 and 60 according to the present embodiment will be described.

  Since the work safety handrails 10 and 60 are attached to the upper flange 50A of the steel girder 50 at the manufacturing factory of the steel girder 50 and can be folded, when used as a work safety handrail on site, Since it only needs to be raised and fixed from the folded state, the work safety handrail is placed on the upper flange of the steel girder with a high height so that the work on the upper flange becomes a work at a high place when placed on the ground. Even in the case of providing a safety handrail for work, it is possible to greatly reduce the work at high places on the site for installation of work safety handrails, and the work content can be made simple work content. The safety of the installation work of the work safety handrail can be greatly improved. Also, the work time at the site for installing the work safety handrail can be greatly reduced.

  In addition, when transported by attaching to a steel girder, the height restriction during transportation can be easily satisfied by lowering the height in the folded state.

  In addition, since the work safety handrail 10 is attached to the upper flange 50A of the steel girder 50 by the clamp 12, when the work safety handrail 10 is no longer necessary, the work safety handrail 10 can be operated simply by releasing the fixing by the clamp 12. The safety handrail 10 can be easily removed. Further, since the work safety handrail 60 is attached to the upper flange 50A of the steel beam 50 by the clamps 12 and 66, when the work safety handrail 60 becomes unnecessary, the fixation by the clamps 12 and 66 is released. Only by this, the work safety handrail 60 can be easily removed.

  Thus, the work safety handrails 10 and 60 are detachable from the upper flange 50A of the steel girder 50, and the removed work safety handrails 10 and 60 can be used again at another site.

  Further, the steel girder 50 has such a height that the work on the upper flange 50A becomes a work at a high place even when placed on the ground (specifically, for example, a height of 1.5 m or more). Therefore, when the work safety handrail 10 can be used as a handrail (the upright state shown in FIG. 2) and then lifted on the pier, the center of gravity of the steel girder 50 is increased and tilted. Since it is unlikely to occur, the work girder 10 can be used as a handrail (the upright state shown in FIG. 2), and then the steel girder 50 can be hung on the pier and installed. It is possible to eliminate the installation work of the safety handrail 10 for work in the far sky.

  In addition, both of the safety handrails 10 and 60 for work are arranged in two rows along both end portions of the upper flange 50A of the steel girder 50, and when using either the safety handrails 10 or 60 for work, The upper flange 50A of the steel beam 50 can be suitably used as a work passage.

  In the embodiment described above, the case where the work safety handrails 10 and 60 are arranged in two rows along the both ends of the upper flange 50A of the steel beam 50 has been described. 60 may be arranged in only one row. When only one row is arranged, the work is performed with a safety belt hooked on the crosspiece 16. If the width of the upper flange 50A of the steel girder 50 is narrow and it is difficult to use it as a work passage when arranged in two rows, it is better to arrange only one row.

10, 60 ... Safety handrail for work 12, 66 ... Clamp 12A ... Tightening part 12B ... Pillar part 12C, 12D ... Hole 14 ... Post 14A ... Side face 14B, 14C, 14D, 14E ... Hole 16, 16A, 16B ... Cross rail 16C , 16D, 16E ... holes 18, 20, 22, 24, 32, 62, 68 ... bolts 18A, 20A, 22A, 24A, 32A, 62A ... nuts 30, 38 ... single pipe for connection 30A ... holes 34, 36 ... free Clamp 50 ... Steel beam 50A ... Upper flange 64 ... Diagonal material

The present invention relates to a method for installing a work safety handrail, and in particular, a work safety for a steel girder having a high height so that work on the upper flange becomes a work at a high place even when placed on the ground. It is related with the installation method of a handrail.

Specifically, as shown in FIG. 10 (FIG. 1 of Patent Document 1), a plurality of fixing pieces 102 are fixed on the upper flange of the beam 101 in two rows in the longitudinal direction of the beam 101 at a predetermined pitch. The invention is described in which the base 104 of the column 103 of the handrail 108 is disposed between the two rows of fixed pieces 102 and attached. Here, reference numeral 105 denotes a shaft provided at the lower end of the column base 104. When the shaft 105 is fitted into a hole (not shown) of the fixed piece 102, the column 103 is rotatable in the longitudinal direction of the beam 101. Reference numeral 106 denotes a handrail attachment plate that is rotatably attached to the upper end of the support post 103 by a shaft 107 in the same plane as the support post 103. Reference numeral 109 denotes a holding screw attached to the handrail attachment plate 106. To fix. The handrail 108 and the column 103 can be folded as shown in FIG. 11 (FIG. 3 of Patent Document 1).

The present invention has been made in view of such problems, and is applied to a steel girder having a high height such that the work on the upper flange becomes a work at a high place when placed on the ground. It can be installed safely on the upper flange of the steel girder, and even if it is transported while attached to the steel girder, it does not conflict with height restrictions during transportation. It is an object to provide a method for installing a safety handrail.

This invention solves the said subject with the installation method of the following safety handrails for work.

That is, the work safety handrail installation method according to the present invention is a work safety handrail installation method installed on a steel girder, and the steel girder is placed on its upper flange even when it is placed on the ground. The work safety handrail is foldable and includes a clamp that is detachable with respect to the upper flange of the steel girder, and the installation method includes the work And a safety handrail for mounting on the upper flange of the steel girder by the clamp in the longitudinal direction of the steel girder, and the mounting step is carried out at the steel girder manufacturing plant. This is a method of installing a safety handrail .

Specifically, the work safety handrail is composed of, for example, two or more columns and one or more horizontal rails, and the columns and the horizontal rails are bolts at the intersections of the columns and the horizontal rails. It is connected by a nut, and the bolt and nut are tightened to weaken the connection so that the column and the cross rail can be rotated, thereby being configured to be folded and raised. It is good also as what was done .

Wherein the working safety handrail has a fixed member fixed to the flange on the steel girder by the clamp, and the lower end of the strut so as to fix the plurality of sets of bolts and nuts to the fixed member, wherein By leaving only one set of bolts and nuts out of a plurality of sets of bolts and nuts and removing the other bolts and nuts, the post is rotated with the remaining bolts as the central axis of rotation. it can be, thereby may be those adapted to allow in fold folded and erected raised.

The working safety handrail has a fixed member fixed to the flange on the steel girder by the clamp, connected by a set of bolts and nuts lower end of the strut to the fixed member, and said post the set of diagonal member for connecting the intersections between the lateral beam and the upper flange of the steel girder only, by releasing the connection of one end of the diagonal member, in fold folded and erected raised as capable and It is good also as what was comprised.

When the horizontal rail is tubular and the work safety handrail further includes a connecting single pipe that connects the adjacent horizontal bars among the horizontal bars, one end of the connecting single pipe is adjacent to each other. By inserting the other end of the connecting single pipe into the other of the horizontal bars and mechanically connecting the other of the adjacent horizontal bars to each other, the adjacent ones of the horizontal bars are mechanically connected. May be .

Further, when there is an overlapping portion when the adjacent ones of the horizontal rails are viewed from a direction orthogonal to the longitudinal direction of the horizontal rail, the adjacent horizontal rails are mechanically replaced by the overlapping portions. You may connect to .

Moreover, further comprising a connecting member for connecting the lateral桟同workers that the work safety handrails are adjacent, and the adjacent groups of the rung when seen from a direction perpendicular to the longitudinal direction of the rungs When there is no overlapping portion, one end of the connecting member is mechanically connected to one of the adjacent horizontal bars, and the other end of the connecting member is mechanically connected to the other of the adjacent horizontal bars. By connecting, adjacent ones of the cross rails may be mechanically connected.

The work safety handrail installed using the present invention is attached to the upper flange of the steel girder at the steel girder manufacturing factory and can be folded, so that it can be used as a work safety handrail on site. Can be fixed on the upper flange of a high steel girder with a high height so that the work on the upper flange becomes a work at a high place when placed on the ground. Even when a safety handrail is provided, it is possible to greatly reduce the work at high places on site for the installation of a safety handrail for work, and the work content can be made simple work content, It is possible to greatly improve the safety of installation work safety handrails on site. Also, the work time at the site for installing the work safety handrail can be greatly reduced.

The work safety handrail installed using the present invention includes a clamp that is detachable with respect to the upper flange of the steel girder, and is attached to the upper flange of the steel girder by the clamp. When the handrail is no longer needed, the work safety handrail can be easily removed simply by releasing the fixing by the clamp, and the removed work safety handrail can be used again at another site. .

The figure which looked at an example of the safety handrail for work which can be used for the present invention from the longitudinal direction (longitudinal direction of a cross beam) of a steel beam 1 arrow view of FIG. The figure which looked at the crosspiece 16A from the longitudinal direction The figure which looked at the crosspiece 16B from the longitudinal direction A view of the safety handrail 10 in a folded state as viewed from the horizontal direction perpendicular to the longitudinal direction of the crosspiece 16 It is a figure for demonstrating the case where the adjacent crosspieces 16 are connected using the connecting single pipe 30, (A) is the figure which looked at the connecting single pipe 30 from the direction orthogonal to the longitudinal direction, (B) is the figure which looked at the edge part of the adjacent horizontal beam 16 before connecting from the horizontal direction orthogonal to the longitudinal direction of the horizontal beam 16, (C) is the single tube 30 for connecting adjacent horizontal beams 16 FIG. 6D is a view of the state after being connected at the horizontal direction perpendicular to the longitudinal direction of the horizontal crosspieces 16, and (D) shows the state after connecting the adjacent horizontal crosspieces 16 with the connecting single pipe 30 downward in the vertical direction. Viewed in The figure which looked at the site | part of the adjacent crosspieces 16 connected with the universal clamp 34 vertically downwards. The figure which looked at the site | part of the adjacent crosspieces 16 connected with the two universal clamps 36 and the single tube 38 for connection downwards perpendicularly | vertically. The figure which looked at the work safety handrail 60 which is another example of the work safety handrail which can be used for this invention from the horizontal direction orthogonal to the longitudinal direction of the crosspiece 16. The figure which looked at the handrail of patent documents 1 from the longitudinal direction (the 1st figure of patent documents 1) The figure which shows the state which raised and the state which raised the handrail of patent document 1

Hereinafter, a working safety handrail that can be used in the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view of an example of a work safety handrail that can be used in the present invention , as viewed from the longitudinal direction of a steel beam (longitudinal direction of a cross beam), and FIG. 2 is a view taken in the direction of arrow A in FIG.

The work safety handrail 10 that can be used in the present invention includes a clamp 12, a column 14, and a crosspiece 16, and both ends of the upper flange 50 </ b> A of the steel beam 50 (the steel beam 50). It is the both ends of the upper flange 50A in the direction orthogonal to the longitudinal direction, and hereinafter, this portion is simply attached to and fixed to “both ends of the upper flange 50A”. That is, the work safety handrail 10 is arranged in two rows along both end portions of the upper flange 50A of the steel girder 50, so that the upper flange 50A of the steel girder 50 can be suitably used as a work passage. It has become. However, in FIG. 1 and FIG. 2, only one work safety handrail 10 of the work safety handrails 10 arranged in two rows is illustrated for convenience of illustration. In addition, the description of the constituent members of the work safety handrail 10 described below will be made while paying attention to only one of the work safety handrails 10, but the other work safety handrail 10 is also composed of similar constituent members.

In the work safety handrail 10 , a square steel pipe is used for the column portion 12 </ b> B of the clamp 12, but the shape of the column portion 12 </ b> B is not limited to this, and the column 14 can be safely fixed to the column portion 12 </ b> B of the clamp 12. If possible, for example, a cylindrical steel pipe may be used.

In the work safety handrail 10 , angle steel is used for the column 14, but the shape of the column 14 is not limited to this, and a square steel pipe may be used as long as the horizontal beam 16 can be stably supported. .

In the work safety handrail 10 , a cylindrical steel pipe is used for the crosspiece 16. However, the shape of the crosspiece 16 is not limited to this, and a square steel pipe can be used as long as it can function as a safety handrail. You may use shape steel and steel plates, such as.

The main components of the work safety handrail 10 that can be used in the present invention have been described above. Next, the operation for folding the work safety handrail 10 and the operation for raising the work safety handrail 10 will be described.

The height of the steel girder 50 to which the work safety handrail 10 is attached is a height at which the work on the upper flange is a high place work even when the work girder 50 is placed on the ground at the construction site. Normally, a steel girder is temporarily placed on a stand of about 0.5 m above the ground at the construction site. Therefore, if the height of the steel girder 50 reaches 1.5 m or more, the steel girder is placed on the ground at the construction site. Often, the top of the girder exceeds 2.0m, which is a work at a height under the occupational safety and health regulations. Therefore, the work safety handrail 10, when the height is attached to the above steel girder 1.5 m, the effect of the present invention is particularly large.

Thus, by using the work safety handrail 10 that can be used in the present invention, the work of providing the work safety handrail on the upper flange 50A of the steel girder 50 temporarily placed on the ground at the construction site is the work at a high place. Even if it becomes, the safety handrail for work can be safely installed on the upper flange 50A of the steel beam 50. Also, the work time for installing the work safety handrail can be greatly reduced.

In the connection structure shown in FIG. 6, the outer diameter of the connecting single tube 30 is slightly smaller than the inner diameter of the horizontal beam 16, and one end of the connecting single tube 30 is inserted inside the horizontal beam 16. Alternatively, the inner diameter of the connecting single pipe 30 may be slightly larger than the outer diameter of the horizontal crosspiece 16, and the end of the horizontal crosspiece 16 may be inserted into the inside of the single connecting pipe 30.

Next, a work safety handrail 60 that is a modified example of the work safety handrail 10 that is another example that can be used in the present invention will be described. The same components as those of the work safety handrail 10 are denoted by the same reference numerals, and description thereof is omitted.

Finally, the effects of the work safety handrails 10 and 60 that can be used in the present invention will be described to explain the effects of the present invention (work safety handrail installation method) .

In the above, work safety handrails 10, 60 along the opposite ends of the upper flange 50A of the steel girder 50, but if you described that are arranged in two rows, the working safety handrails 10, 60 1 Only the columns may be arranged. When only one row is arranged, the work is performed with a safety belt hooked on the crosspiece 16. If the width of the upper flange 50A of the steel girder 50 is narrow and it is difficult to use it as a work passage when arranged in two rows, it is better to arrange only one row.

Claims (9)

A safety handrail for work attached to the upper flange of a steel girder,
The steel girder has a height at which the work on the upper flange becomes a work at a high place even when placed on the ground,
The work safety handrail is attached in the longitudinal direction of the steel girder on the upper flange at the steel girder manufacturing factory, and is foldable and attachable to and detachable from the upper flange of the steel girder. A work safety handrail comprising a free clamp and attached to the upper flange of the steel girder by the clamp.   2. The work safety handrail according to claim 1, wherein the work safety handrail is attached to both end portions of the upper flange in a direction orthogonal to a longitudinal direction of the steel beam. The work safety handrail consists of two or more struts and one or more horizontal rails,
The column and the horizontal beam are connected by a bolt and a nut at an intersection of the column and the horizontal beam, and the column and the horizontal beam can be rotated by weakening the tightening of the bolt and the nut. The work safety handrail according to claim 1, wherein the work safety handrail is capable of being folded and raised. The work safety handrail has a fixing member fixed to the upper flange of the steel girder with the clamp,
The lower end of the column is fixed to the fixing member by a plurality of sets of bolts and nuts, leaving only one set of bolts and nuts of the plurality of sets of bolts and nuts, and the other bolts and nuts. 4. The work safety handrail according to claim 3, wherein the safety handrail can be folded and erected by being removed. The work safety handrail has a fixing member fixed to the upper flange of the steel girder with the clamp,
The lower end portion of the support column is connected to the fixing member by a set of bolts and nuts, and is an oblique connection between the intersection of the support column and the cross beam and the upper flange of the steel beam. The work safety handrail according to claim 3, wherein a material is provided, and when the folding material is folded or raised, connection of one end of the diagonal material is released.   6. The work safety handrail according to claim 3, wherein adjacent ones of the cross rails are mechanically connected to each other. The horizontal beam is tubular, and further includes a connecting single pipe that connects adjacent horizontal beams among the horizontal beams,
One end of the connecting single pipe is inserted into one of the adjacent horizontal bars, and the other end of the connecting single pipe is mechanically connected to the other of the adjacent horizontal bars. The work safety handrail according to claim 6.   There is an overlapping part when adjacent ones of the horizontal bars are viewed from a direction perpendicular to the longitudinal direction of the horizontal bars, and the adjacent horizontal bars are mechanically connected at the overlapping part. The work safety handrail according to claim 6, wherein the work safety handrail is provided. It further includes a connecting member that connects adjacent horizontal rails,
There is no overlapping portion when the adjacent ones of the horizontal rails are viewed from the direction perpendicular to the longitudinal direction of the horizontal rails,
One end of the connecting member is mechanically connected to one of the adjacent horizontal bars, and the other end of the connecting member is mechanically connected to the other of the adjacent horizontal bars. The work safety handrail according to claim 6.

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