JP2005188275A - Preceding handrail for temporary scaffold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preceding handrail for a temporary scaffold which enables a worker on an existing working floor to carry out a transfer work of the handrail when relocating the preceding handrail to the uppermost layer level for building up the scaffold on the uppermost layer. <P>SOLUTION: The preceding handrail 20 is provided on the temporary scaffold where upright posts of the uppermost layer are successively built up in accordance with a progress of the construction work, and projects upward from the working floor 9. The preceding handrail is composed of a preceding handrail pole 21 installed parallel to the upright post 2 and a handrail member 50 engageable to the preceding handrail pole. The preceding handrail has a first engaging part 30 for engaging the upright post relatively displaceable in a vertical direction, a second engaging part 40 for engaging the upright post to prevent the preceding handrail from descending, and an engaging means 22 for engaging detcahably an engaging part of the handrail member. The first engaging part is relatively and rotatably supported by the preceding handrail pole. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a preceding handrail of a temporary scaffold, and more particularly to a preceding handrail of a temporary scaffold configured to protrude upward from the uppermost work floor.

  As a temporary scaffold used for construction work of a building or a civil engineering structure, a frame scaffold and a single pipe scaffold are practically used. The frame scaffolding is built outside the building under construction by building the building frame and laying the floored cloth frame on each layer of the building frame as a working scaffold board, and dismantled at an appropriate time just before the completion of the construction work Is done. On the other hand, a single pipe scaffold is a temporary scaffold of a type in which single pipes (steel pipes) are sequentially built on the upper layer according to the progress of construction work. Single-pipe scaffolding consists of steel pipes that comprise fixed base metal fittings on the ground surface at predetermined intervals, erected steel pipe construction, and are used to form roots, arms, cloth, center rails, handrails, braces, etc. It is assembled by tying with a fastening fitting (clamp fitting) and laying the scaffolding board on the arm. Single pipe scaffolds, like the framework scaffolds, are dismantled at an appropriate time just prior to completion of construction work.

  A handrail must be provided on the uppermost work floor of the temporary scaffolding as a safety measure to prevent the crash. Since the uppermost handrail protrudes upward from the uppermost fabric frame, it is generally called a preceding handrail, a front handrail or a handrail preceding type scaffold (hereinafter simply referred to as “preceding handrail”). This leading handrail must be moved to the upper layer one by one when the scaffold is extended upward as the construction progresses. Conventionally, in any type of temporary scaffolding, a construction method has been employed in which a steel pipe is assembled in a handrail form as a leading handrail.

  Here, as for the frame scaffolding, a lifting / replacement type frame scaffolding handrail that simplifies the moving work of the preceding railings has been developed in recent years and is becoming popular in a relatively large number of construction sites. As this type of preceding handrail, an elevating-type preceding handrail having a guide roller that runs on a vertical column of a building frame is known (Japanese Patent Laid-Open No. 2003-41779). Another type of handrail for frame scaffolding is a refillable handrail composed of handrail struts that can be attached to vertical struts (buildings) of building frames and telescopic handrails built between handrail struts. Known (Japanese Patent Laid-Open No. 2001-288883).

On the other hand, in a single pipe scaffolding, fasteners, etc. for connecting scaffold components such as building land, arms, cloth, etc., are attached everywhere on the building ground, so the lifting and lowering handrails for framed scaffolds (These handrails have a portion that moves up and down while engaged with the building). For this reason, for single-pipe scaffolding, after assembling the upper building, rooting, braces, cloth, and scaffolding plate, a steel pipe for the handrail on the uppermost scaffolding plate is attached to the building with a tight fitting. Is still adopted. Such a handrail attachment work is a high place work that is performed without a handrail itself, so as a safety measure, it is attached to a master rope rope stretched between construction sites or at predetermined intervals on the construction site. The safety band locking metal fitting etc. which are used are used (Unexamined-Japanese-Patent No. 8-226226). For example, using a construction pipe in which a safety band former metal fitting called a rotary guide is attached in advance to a steel pipe for a single-ply scaffold at an interval of about 30 cm, or attaching a steel pipe fastening fitting to an appropriate place on a building, Measures to ensure the safety of work are actually taken by mooring hooks of safety belts to the metal fittings.
JP 2003-41779 A JP 2001-288883 JP-A-8-226226

  However, safety measures that depend on parent ropes have difficulties in terms of work efficiency and certainty. In addition, safety measures that use steel pipe tightening brackets as safety band locking brackets are not necessarily reliable in terms of strength or durability because they are used for purposes different from their intended use. Considering the point that it is difficult to install and remove the bracket, there is a possibility that it may interfere with the position of the scaffolding steel pipe, and the safety when mounting the bracket on the upper building. Then, there was also a difficulty in terms of practicality.

  For this reason, when moving the leading handrail to the uppermost layer to assemble the uppermost single-pipe scaffolding, such as a lifting handrail or a handrail for a frame scaffold, the existing work floor (i.e. There has been a demand for the development of a handrail for a single-pipe scaffolding that allows the worker on the lower work floor) to perform the work of moving the handrail.

  The present invention has been made in view of such problems, and the object of the present invention is to provide an existing work floor (i.e., when transferring a handrail to the uppermost level in order to assemble the uppermost scaffold. It is an object of the present invention to provide a temporary handrail for a temporary scaffold that allows an operator on the lower floor (the work floor below the uppermost layer) to perform a handrail transfer work.

In order to achieve the above object, the present invention is provided in a temporary scaffold that sequentially builds the upper building according to the progress of the construction work, and in the preceding handrail of the temporary scaffold protruding upward from the uppermost work floor,
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar is integrally connected to the building or the building so as to prevent the lowering of the preceding handrail pillar, and a first engaging portion that engages with the building so as to be relatively displaceable in a vertical direction. A second engaging portion that engages with the scaffold component; and a locking means that removably locks the locking portion of the handrail member, wherein the first engaging portion is a portion of the second engaging portion. Provided is a preceding handrail for a temporary scaffold, which is arranged on the upper side and is supported by a preceding handrail column main body so as to be relatively rotatable.

  According to the above configuration of the present invention, the worker on the existing work floor locks the locking portion of the handrail member with the locking means of the leading handrail column, and the first engaging portion of the leading handrail column is the uppermost layer. After attaching to the building site, the handrail pillar is raised by the guidance of the building site. Since the first engaging portion moves up the building ground while being rotationally displaced with respect to the preceding handrail column, the preceding handrail column is smoothly raised by the guidance of the building site. The operator attaches the second locking portion of the preceding handrail column to the building or scaffolding component (cloth, etc.) when the preceding handrail column rises to a predetermined position, and prevents the descending of the preceding handrail column, A leading handrail post can be attached to the top level.

  The operator further locks the other locking portion of the handrail member to the locking means of another preceding handrail column, and the first engaging portion of the preceding handrail column with respect to the adjacent uppermost building. And push up the handrail pillar along the building. The first engaging portion rises on the building ground while being rotationally displaced, and the leading handrail pillar rises smoothly along the building land. By attaching the second locking portion to the building when the preceding handrail column has risen to a predetermined position, the preceding handrail column can be attached to the upper part of the adjacent building. The handrail member is suspended horizontally between the preceding handrail pillars to form the uppermost level handrail.

The present invention is also provided in a temporary scaffolding that is provided in a temporary scaffolding that sequentially builds the upper building according to the progress of the construction work, and protrudes upward from the uppermost working floor.
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar includes a first engaging portion fixed to a scaffold component integrally connected to the building, and a second engaging portion engaged with the building to prevent the preceding handrail pillar from being lowered. And a locking means for removably locking the locking portion of the handrail member, wherein the first engagement portion is disposed on the upper side of the second engagement portion and is relative to the preceding handrail pillar body. Provided is a handrail for a temporary scaffold characterized by being rotatably supported.

  According to the above-described configuration of the present invention, the worker on the existing work floor locks the locking portion of the handrail member to the locking means of the preceding handrail pillar and is integrally connected to the uppermost building. The first engaging portion of the preceding handrail post is attached to the component member. In the case of a single-pipe scaffold constructed by tying each tubular body constituting the building site, the timber, and the cloth with a tying tool, the limb can be suitably used as such a scaffold component. Preferably, the first engaging portion is supported by the preceding handrail column so as to be rotatable about the vertical center axis and / or the horizontal axis of the preceding handrail column. More preferably, the second engaging portion is fixed to the building at a level below the uppermost work floor to which the leading handrail is to be transferred.

  Since the first engaging portion supported so as to be relatively rotatable with respect to the preceding handrail post body rotates when the first engaging portion is attached to the scaffold component, the mounting operation of the first engagement portion with respect to the scaffold component is It is relatively easy. The ease of work leads to ensuring safety, so it is very useful in practice. For example, since the operator can rotate the first engagement portion and quickly and appropriately attach it to the scaffold component member, the possibility that the leading handrail pillar will drop or drop during such work is greatly reduced. To do.

The present invention is further provided in a temporary scaffold that sequentially builds the upper building according to the progress of the construction work, and in the preceding handrail of the temporary scaffold protruding upward from the uppermost work floor,
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar includes a fixing portion fixed to a building, and a locking means for detachably locking the locking portion of the handrail member, and the fixing portion is an uppermost layer to which the leading handrail is to be transferred. A temporary handrail for a temporary scaffolding is provided, which is fixed to the building at a level below the work floor and supports the preceding handrail pillar.

  According to such a configuration of the present invention, the worker on the existing work floor can firmly fix the fixed portion provided on the preceding handrail pillar to the building floor at the lower level of the uppermost work floor during the moving operation of the preceding handrail. Can be fixed to. Therefore, the work efficiency, safety, and certainty of the handrail moving work are greatly improved.

  According to the present invention, when transferring the handrail to the top layer level to assemble the top layer scaffolding, a master rope or a construction pipe with a safety belt locking bracket as in the past is used, or The operator of the existing work floor can perform the handrail moving work without using the steel pipe binding metal fitting as the safety belt locking means. In addition, the preceding handrail of the present invention is lightweight, and the preceding handrail column can be raised smoothly, so that the moving operation of the preceding handrail can be performed with a relatively slight force. For this reason, the leading handrail of the present invention can be designed so that a female worker or the like having relatively weak arm strength can perform the leading handrail moving work alone, which is extremely advantageous practically.

  The preceding handrail of the present invention can be used in both the single tube scaffold and the frame scaffold, but when compared with the conventional handrail assembly method of the single tube scaffold, the preceding handrail of the present invention is used as the preceding handrail of the single tube scaffold. Particularly advantageous effects are obtained when used.

  In a preferred embodiment of the present invention, the preceding handrail column is deformed so as to project outward from the scaffold, and the first engagement portion is supported by a horizontal support member extending from the preceding handrail column body to the inside of the scaffold. . According to such a configuration, since the handrail member can be arranged outside the scaffold so that the scaffold component member and the handrail member do not interfere when the preceding handrail is raised, the preceding handrail can be raised relatively easily. it can.

  Preferably, the leading handrail post includes a safety belt mooring portion capable of mooring the safety belt. The safety belt mooring portion is made of a member capable of mooring the hook of the safety belt and is disposed at the upper end portion of the preceding handrail pillar. More preferably, the safety band mooring part has a form that can be gripped with fingers, and the operator can lift or move the preceding handrail pillar by holding the safety band mooring part with fingers. As a modified example, a parent rope guide portion capable of mooring the parent rope is provided on the preceding handrail pillar.

  According to a preferred embodiment of the present invention, the second engaging portion engages with the building site so as to be relatively displaceable in the vertical direction, and is prevented from descending by the fastening hardware attached to the building site, and the leading handrail. Due to its own weight, it rests on the fastening hardware in a stable state. According to another preferred embodiment of the present invention, the second engagement portion is composed of a fastening tool that can be fastened to the building site, and prevents the descending of the preceding handrail column by the fastening force with respect to the building site.

  Preferably, the engaging portion of the preceding handrail pillar includes a holding member that forms a recess capable of accommodating a building site, and an opening / closing member that prevents the building site accommodated in the recess from being detached from the recess. The opening / closing member is pivotally supported by the holding member and is displaced between a closed position for closing the recess and an open position for opening the recess. More preferably, the holding member includes a one-touch type locking mechanism that restrains the opening / closing member in the closed position. As this type of locking mechanism, for example, a plunger type locking mechanism or gravity that restrains the locked member by the elastic restoring force of the spring and releases the locking force of the locked member relatively easily by the external force deformation of the spring. A lock mechanism or the like can be suitably used.

  Preferably, the handrail member includes a locking portion having a locking hole at both ends, and the locking means of the preceding handrail column includes a horizontal shaft portion that can be inserted into the locking hole. The horizontal shaft portion includes a protruding or tongue-like member protruding from the shaft portion. The projecting or tongue-like member transiently retracts into the shaft portion when the shaft portion is inserted into the locking hole of the handrail member. When the shaft portion is completely inserted into the locking hole of the handrail member, the projecting or tongue-like member returns to the initial protruding form and prevents the engaging portion of the handrail member from being detached from the horizontal shaft portion. . As such a horizontal shaft portion locking mechanism, the above-described gravity lock mechanism or the like can be suitably used.

  The preceding handrail preferably includes an intermediate rail made of a handrail member, and the preceding handrail column includes second locking means capable of locking the locking portion of the handrail member at the intermediate height portion. The handrail member constituting the middle rail is locked to the preceding handrail pillar at the same time when the uppermost level handrail is formed. When the two handrail members are locked to the preceding handrail pillar in this way, when the preceding handrail is moved to the uppermost level, the handrail and the middle rail are assembled at the same time, so that the safety of the work after the dredging is further increased. If desired, after laying the uppermost level scaffolding plate, the middle rail is locked to the leading handrail pillar on the uppermost working floor, or an additional middle rail (second or third middle rail) is attached. It is also possible to engage with the leading handrail column, or to construct a bracing bar to be additionally locked to the preceding handrail column.

  As the handrail member, it is possible to use a relatively high-rigidity linear member that extends between adjacent preceding handrail columns and rotates, expands, contracts, or deforms following the change in the relative position of the preceding handrail columns. A typical example of this type of handrail member is an extendable handrail composed of an inner tube and an outer tube having a double-pipe structure assembled in a telescopic manner. The telescopic handrail extends by the protrusion of the inner tube from the outer tube, and is shortened by drawing the inner tube into the outer tube. Locking portions that can be locked to the locking means of the preceding handrail pillar are provided at both ends of the telescopic handrail. As a handrail member of another structure, for example, a high-strength linear member that can be elastically deformed, a relatively high-rigidity rope, a high-strength chain, or a bendable high-rigidity linear member that has a joint connecting means in the middle part Etc.

  In addition to the first and second engaging portions, the leading handrail pillar may further include a third engaging portion that engages with a scaffold component member integrally connected to the building site. For example, the third engaging portion is seated on the cloth and transmits the load of the preceding handrail pillar to the cloth.

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

  FIG. 1 is a perspective view and an elevation view showing the overall structure of a single tube scaffold.

  The single-pipe scaffolding 1 is constructed by assembling a building 2 made of steel pipe, a root tie 3, a cloth 4, a brace 5, a handrail 6, a middle rail 7, a brace 8, and a scaffolding board 9 in multiple layers (seven layers in FIG. 1). It is arranged along the outer wall surface of the building A under construction. Curing nets 15 and 16 (FIG. 1 (B)) for preventing tool dropping or the like are stretched on the outer surface or the like of the single pipe scaffold 1, and a wall connecting member 17 for preventing the single pipe scaffold 1 from being tilted is provided on the building 2 And the building A is arranged to be interconnected.

  In the initial stage of assembling the single pipe scaffold 1, the floor board 11 is arranged on the ground according to the arrangement of the single pipe scaffold 1, and the fixed base metal fitting 12 is fixed to the floor board 11 by a locking tool such as a nail. . The root guard 3 is fastened to the lowermost part of the building 2 by a fastening fitting (clamp fitting) 13 and interconnects the building 2 near the ground level. The building 2 is arranged at an interval of about 0.9 to 1.2 m in the beam-to-beam direction and about 1.8 m in the beam direction. The cloth 4 and the braces 5 are fastened to the building 2 by the fastening fittings 13 and are laid between the buildings 2 in the beam-to-beam direction or the crossing direction.

  As the building A sequentially extends to the upper layer according to the progress of the building work, the building site 2 is successively added to the upper layer by the fittings. The cloth 4, the arm 5, the handrail 6, the middle rail 7, and the brace 8 of each layer are sequentially fastened to the building site 2 by fastening hardware. Scaffold plates 9 of each layer are laid between the arms 5 and a work floor or a work passage is formed in each layer. At a level higher than the second layer, the handrail 6 and the middle rail 7 are fastened to the building site 2 by the fastening hardware. The handrail 6 is disposed at a height of 90 cm or more from the scaffold plate 9.

  In the single-tube scaffold 1 shown in FIG. 1, the uppermost (seventh) scaffolding plate 9 is laid, and the uppermost part of the building 2 is a predetermined distance from the uppermost scaffolding plate 9, for example, about 1 to It protrudes upward about 1.5m. The leading handrail 20 of the present invention is disposed on the uppermost building 2.

  2 to 9 show a first embodiment of the leading handrail 20. FIG. 2 is an elevation view of the uppermost layer portion of the single-tube scaffold 1 showing the configuration of the leading handrail 20, and FIG. 3 is a perspective view, a front view, and a side view of the leading handrail column 21 that constitutes the leading handrail 20. is there.

  As shown in FIG. 2, the leading handrail 20 includes a leading handrail column 21 disposed on the work floor side (the side of the scaffolding plate 9) of each building 2, and two upper and lower stages in which both ends are locked to the preceding handrail column 21. It is comprised from the telescopic handrail 50 of a handrail and a middle rail. The leading handrail pillar 21 includes upper and lower holders 30 and 40 that engage with the building 2 at the upper end portion and the lower end portion, and the protrusions 22 constituting the locking means that can lock the telescopic handrail 50 are provided at the upper and middle portions. Prepare for the department. The telescopic handrail 50 constituting the handrail is disposed at a height of a distance H from the scaffold plate 9.

  As shown in FIG. 3, the main body portion of the leading handrail column 21 is made of a vertical steel square hollow member having a square cross section, and a U-shaped gripping portion 23 that can be gripped by a finger is formed by the leading handrail column. 21 is disposed at the upper end of the plate. The operator can hold the gripping part 23 with fingers and lift or carry the leading handrail pillar 21. The gripping portion 23 is disposed on the work floor side of the building 2 at the level of the handrail, and constitutes a safety belt mooring portion that can moor a hook of the safety belt.

  The upper and lower protrusions 22 have substantially the same structure, and each protrusion 22 includes a horizontal shaft portion 24 and a movable tongue portion 25. The horizontal shaft portion 24 protrudes horizontally from the surface of the preceding handrail pillar 21 on the work floor side (the scaffold plate 9 side). The movable tongue 25 is a triangular vertical movable plate that expands toward the proximal end of the horizontal shaft 24, and hangs down from the horizontal shaft 24. The movable tongue 25 is always urged downward by a spring (not shown) housed in the horizontal shaft 24, and the horizontal shaft 24 and the movable tongue 25 constitute a gravity lock mechanism.

  4A is a plan view showing the structure of the holder 30, and FIGS. 4B, 4C, and 4D are II lines shown in FIG. It is sectional drawing in the II-II line and the III-III line. 5A is a plan view showing the structure of the holder 40, and FIGS. 5B, 5C, and 5D are IV-IV lines shown in FIG. It is sectional drawing in a V-V line and a VI-VI line.

  As shown in FIG. 4, the upper holding tool 30 is pivotable about a rotation holding portion 31 rotatably supported by the horizontal support shaft 27 of the preceding handrail column 21 and a vertical pivot 33 of the rotation holding portion 31. The opening / closing portion 32 is supported, and a locking mechanism 34 that locks the opening / closing portion 32 at a closed position indicated by a solid line in FIG. The holder 30 constitutes a first engaging portion that engages with the building 2 so as to be relatively displaceable in the vertical direction.

  The support shaft 27 includes a bolt 27a that penetrates the upper end portion of the preceding handrail column 21, and a washer-attached nut 27b that is screwed into a tip portion of the bolt 27a. The rotation holding portion 31 has a configuration in which an upper plate 31a, a lower plate 31b, and a vertical base end portion 31c are integrated, and a bolt hole 31d through which the bolt 27a passes is formed in the base end portion 31c. The head portion of the bolt 27a rotatably supports the base end portion 31c by tightening the appropriate nut 27b, and the base end portion 31c rotates around the horizontal center axis of the bolt 27a.

  The upper plate 31a and the lower plate 31b form a substantially semicircular recess 38 capable of receiving the building 2 and the left and right arms 35 extending on both sides of the recess 38 so as to correspond to the circular section of the building 2; 36 is formed. The upper plate 31 a and the lower plate 31 b support the pivotal support portion 32 a of the opening / closing portion 32 by a pivot 33 disposed on the first arm portion 35, and can be pivoted by a locking mechanism 34 disposed on the second arm portion 36. The distal end portion 32 b of the opening / closing portion 32 is locked to the second arm portion 36.

  The pivot 33 is formed of a rivet that vertically penetrates the upper plate 31a and the lower plate 31b, and penetrates the circular opening 32c of the base end portion 32a as shown in FIG. 4C. As shown in FIG. 4D, the locking mechanism 34 includes a base 34a fixed to the upper plate 31a, a locking tool 34b screwed into the base 34a, and a downward projecting from the lower end of the locking tool 34b. Latch part 34c. The latch portion 34 c passes through the opening portion 31 d of the upper plate 31 a and extends into the locking hole 32 d of the opening / closing portion 32. The locking tool 34 b includes a spring (not shown) that constantly urges the latch portion 34 c downward, and the latch portion 34 c is locked to the opening / closing portion 32.

  When the disc-shaped knob portion 34f of the locking tool 34b is pulled upward with fingers, the latch portion 34c rises against the spring force of the spring and is detached from the locking hole 32d. The opening / closing part 32 rotates in the clockwise direction around the pivot 33 and moves to an open position indicated by a broken line in FIG. In the open position, the holder 30 can be disengaged from the building site 2 and detached from the building site 2.

  When the opening / closing portion 32 is rotated counterclockwise from the open position around the pivot 33, the inclined surface 32e of the opening / closing portion 32 abuts with the inclined surface 34e of the latch portion 34c, and the latch portion 34c is caused by the elasticity of the spring. Push up transiently against. When the latch portion 34c and the locking hole 32d are aligned, the latch portion 34c protrudes again due to the spring force of the spring and engages with the opening / closing portion 32 as shown in FIG. The holder 30 in the closed position holds the building 2 in the recess 38 by the rotation holding part 31 and the opening / closing part 32.

  The structure of the lower holder 40 that is paired with the upper holder 30 is shown in FIG. The holding tool 40 constitutes a second engaging portion that engages with the building site 2 so as to prevent the descending of the handrail pillar. The holding tool 40 is shown by a solid line in FIG. 5A, a fixed holding portion 41 fixed to the preceding handrail column 21, an opening / closing portion 42 supported so as to be pivotable about the vertical pivot 43 of the holding portion 41. The locking mechanism 44 locks the opening / closing part 42 in the closed position.

  The structure of the holder 40 is substantially the same as the structure of the holder 30 except that the holding portion 41 is fixed to the preceding handrail pillar 21. That is, the holding portion 41 has a configuration in which the upper plate 41a, the lower plate 41b, and the vertical base end portion 41c are integrated, and the base end portion 41c is fixed to the leading handrail column 21 by welding or a fixing bolt. The upper plate 41a and the lower plate 41b form a substantially semicircular recess 48 that can receive the building 2. The pivot 43 disposed on the first arm portion 45 of the holding portion 41 supports the base end portion 42 a of the opening / closing portion 42 so as to be pivotable, and the locking mechanism 44 disposed on the second arm portion 46 of the holding portion 41. Locks the distal end portion 42 b of the opening / closing portion 42 to the second arm portion 46. The pivot 43 passes through the circular opening 42c of the base end portion 42a, and the locking mechanism 44 includes a base 44a, a locking tool 44b, and a latch portion 44c. The latch portion 44c is a locking hole 42d of the opening / closing portion 42. Extend into.

  When the disc-shaped knob portion 44f of the locking tool 44b is pulled upward with fingers, the latch portion 44c rises against the spring force of the spring, and is detached from the locking hole 42d. The engagement with the ground 2 can be released and the building 2 can be detached. When the opening / closing portion 42 in the open position is rotated to the closed position around the pivot 43, the latch portion 44c is transiently pushed up by the contact of the inclined surfaces 42e, 44e, and the latch portion 44c is locked in the locking hole 42d. Thus, the holder 40 holds the building site 2 in the recess 48.

  FIG. 6 is a plan view, a front view, and a partially enlarged sectional view showing the structure of the telescopic handrail 50.

  The telescopic handrail 50 includes an inner pipe 51 and an outer pipe 52 assembled in a telescopic manner. The inner tube 51 is inserted into the outer tube 52 so as to be relatively displaceable. The telescopic handrail 50 is extended by the protrusion of the inner tube 51 from the open end of the outer tube 52 and is shortened by drawing the inner tube 51 into the outer tube 52. Locking portions 53 and 54 are provided at the outer end portions of the inner tube 51 and the outer tube 52, and a locking hole 55 into which the protrusion 22 of the preceding handrail column 21 can be inserted is a flat plate portion of the locking portions 53 and 54. 56 and 57 are respectively drilled. In use, the locking hole 55 allows the protrusion 22 (FIG. 3) to pass through in a loosely fitted state. The locking portion 53 has a tubular base 58 into which the outer end of the inner tube 51 can be inserted. The outer end of the inner tube 51 inserted into the base 58 is welded using a circular opening 59 for welding or the like. To the base 58.

  The locking pins 61 and 62 are fixed inside the inner tube 51 and the outer tube 52 and extend in the diameter direction of the tubes 51 and 52. The elastic member 60 goes around the locking pins 61 and 62 and extends between the locking pins 61 and 62. The elastic member 60 elastically frictionally engages with the inner peripheral surface of the outer tube 52 by its elastic restoring force to cause a smooth expansion and contraction of the inner tube 51 and prevents the inner tube 51 from dropping off from the outer tube 52. To do. The locking pin 62 also abuts on the inner end of the inner tube 51 drawn into the outer tube 52 and inhibits further pulling of the inner tube 51. Therefore, the maximum length of the telescopic handrail 50 is regulated by the elastic member 60, and the minimum length of the telescopic handrail 50 is determined by the position of the locking pin 62.

  FIG. 7 is a partial side view showing a mode in which the locking portions 53 and 54 of the telescopic handrail 50 are locked to the protrusion 22 of the preceding handrail pillar 21.

  When the locking portions 53 and 54 are engaged with the horizontal shaft portion 24 so as to insert the protrusions 22 into the locking holes 55 (FIG. 7A), the movable tongue 25 is moved to the locking portions 53 and 54. It collides and retracts into the horizontal shaft portion 24 (FIG. 7B). When the locking hole 55 exceeds the movable tongue 25, the movable tongue 25 is raised again by the elastic restoring force of the spring built in the horizontal shaft portion 24, and the locking portions 53, 54 are locked to the horizontal shaft portion 24. (FIG. 7C). When the locking portions 53 and 54 are removed from the protrusion 22, the movable tongue 25 may be retracted into the horizontal shaft portion 24 with fingers and the locking portions 53 and 54 may be detached from the horizontal shaft portion 24. The protrusions 22 engage with the extendable handrails 50 located on both sides of the preceding handrail column 21.

  Next, a method for using the leading handrail 20 will be described.

  8 and 9 are elevation views showing how to use the leading handrail 20.

  The operator attaches the upper holding tool 30 of the leading handrail column 21 to the upper building 2 (FIG. 8A), and the locking portions 53 or 54 of the telescopic handrails 50 for the handrail and the middle rail. Are respectively engaged with the upper and lower protrusions 22 and the lower part of the preceding handrail pillar 21 is held with fingers to push up the preceding handrail pillar 21 (FIG. 8B). The leading handrail column 21 is inclined with respect to the building site 2, and the inclination angle thereof changes when it rises. However, since the upper holding tool 30 rotates relative to the preceding handrail column 21, the preceding handrail column 21 rises by guiding the building site 2 while slightly changing the inclination angle with respect to the building site 2. When the lower end portion of the preceding handrail column 21 rises beyond the fastening fitting 13 disposed at the intersection of the building site 2 and the cloth 4, the building site 2 is accommodated in the lower holding tool 40 of the preceding handrail column 21. By closing the opening / closing part 42, the upper and lower holders 30, 40 can be attached to the building 2 so as to be movable up and down (FIG. 8C). Since the lower holding tool 40 is prevented from descending by the fastening fitting 13, the leading handrail column 21 is stationary at the level of the uppermost building 2. In addition, the attachment of the holders 30 and 40 to the building 2 is performed by rotating the open / closed portions 32 and 42 in the open position to the closed position and housing and holding the building 2 in the recesses 38 and 48 as described above. (FIGS. 4A and 5A).

  Next, the operator locks the locking portion 53 or 54 of each telescopic handrail 50 to the protrusion 22 of the preceding handrail column 21 in order to attach another (second) preceding handrail column 21 to the adjacent building 2. Then, the upper holding tool 30 is attached to the building 2 and the leading handrail pillar 21 is pushed up (FIG. 8D). The second leading handrail column 21 rises along the building site 2 while the tilt angle with respect to the building site 2 is slightly changed by the rotation of the holder 30. The operator further attaches the lower holding tool 40 of the preceding handrail column 21 to the building site 2 when the lower end portion of the preceding handrail column 21 rises beyond the fastening fitting 13 (FIG. 8E). The upper and lower holders 30 and 40 engage with the building 2 so as to be movable up and down. Since the lower holding tool 40 is prevented from descending by the fastening fitting 13, the leading handrail column 21 is stationary at the level of the uppermost building 2, and the telescopic handrail 50 is horizontally disposed between the preceding handrail columns 21. Extend.

  Subsequently, the operator hooks the locking portion 53 or 54 of another telescopic handrail 50 on the protrusion 22 of the second preceding handrail column 21 attached in advance so as to form the preceding handrail on the adjacent building span (see FIG. 9 (A)). This operation can be performed by holding one end portion of the telescopic handrail 50 with fingers and engaging the engaging portion 53 or 54 on the other end side with the protrusion 22. The telescopic handrail 50 may be locked to the protrusion 22 of the second preceding handrail column 21 before the work of attaching the second preceding handrail column 21 to the building 2 (FIG. 8D).

  The operator further locks the other locking portion 53 or 54 of each telescopic handrail 50 to the protrusion 22 of another (third) preceding handrail column 21 and attaches the upper holding tool 30 to the building site 2. The handrail column 21 is pushed up (FIG. 9B). The leading handrail column 21 rises along the building site 2 while the inclination angle with respect to the building site 2 is slightly changed by the rotation of the upper holding tool 30. When the lower end portion of the leading handrail column 21 exceeds the binding fitting 13, the lower holding tool 40 of the leading handrail column 21 is attached to the building site 2 (FIG. 9C), and the upper and lower holding tools 30, 40 are Engage with the building 2 so as to be movable up and down. Since the lower holding tool 40 is prevented from descending by the fastening fitting 13, the leading handrail column 21 is stationary at the level of the uppermost building 2, and the telescopic handrail 50 is horizontally disposed between the preceding handrail columns 21. Extend.

  By repeating such a series of operations, the leading handrail 20 can be formed over the entire uppermost level. Thus, according to the preceding handrail 20 having the above-described configuration, the work of transferring the preceding handrail to the uppermost layer can be performed safely and quickly by the worker on the existing work floor. The preceding handrail column 21 and the telescopic handrail 50 are relatively lightweight, and the preceding handrail column 21 is smoothly raised, so that the handrail moving operation can be performed with a relatively small force. Further, when the single pipe scaffold 1 is dismantled, the leading handrail 20 is lowered entirely by lowering the leading handrail pillar 21 along the building 2, so that handling at the time of dismantling the scaffold is easy. . Moreover, according to the preceding handrail 20 having the above-described configuration, the attachment or removal of the preceding handrail 20 can be easily and quickly performed by closing and opening the holders 30 and 40 and locking and removing the telescopic handrail 50. In addition, since the number of parts is relatively small, it is possible to efficiently transfer the components or materials of the leading handrail between construction sites, and it is possible to reduce expenses such as movement and transportation between construction sites. It is extremely advantageous for practical use.

  FIG. 10 is a perspective view, a front view, and a side view of the leading handrail column 21 according to the second embodiment of the present invention.

  The leading handrail column 21 shown in FIG. 10 includes upper and lower holders 30 and 40 ′ that engage with the building site 2 at the upper end portion and the lower end portion, as in the above-described embodiment, and can lock the telescopic handrail 50. Protrusions 22 constituting locking means are provided in the upper part and the central part. However, the lower holding tool 40 ′ has a structure similar to a steel pipe binding metal fitting (clamp metal fitting), and a fixed holding portion 41 ′ fixed to the preceding handrail column 21 and a support portion 43 of the holding portion 41 ′. An opening / closing portion 42 'supported by' and a locking mechanism 44 'for locking the opening / closing portion 42'.

  FIG. 11 is a perspective view of the leading handrail column 21 according to the third embodiment of the present invention.

  The upper holding tool 30 ″ is supported on the rotation holding portion 31 ″ by a rotation holding portion 31 ″ attached to the upper portion of the preceding handrail column 21 so as to be rotatable about a horizontal axis, and a left and right locking mechanism 34 ″. The lower holding tool 40 ″ is supported by the fixed holding portion 41 ″ by the fixed holding portion 41 ″ fixed to the preceding handrail column 21 and the left and right locking mechanisms 44 ″. And an opening / closing part 42 ″.

  12 is a perspective view, a front view, and a side view of the preceding handrail pillar 21 according to the fourth embodiment of the present invention, and FIG. 13 is a single-tube scaffolding that shows a usage pattern of the preceding handrail pillar 21 shown in FIG. It is an elevation view of an upper layer part. 12 and 13, components that are substantially the same as those shown in FIGS. 2 to 11 are given the same reference numerals.

  In each of the above-described embodiments, the preceding handrail pillar that can be suitably used in a normal single pipe scaffold in which the upper end level of the building 2 is set uniformly has been described. On the other hand, as a method for assembling a single pipe scaffold, as shown in FIG. 13, a method for assembling a building zigzag assembly in which a height difference occurs at the upper end level of the building 2 is known. FIG. 13 shows a state in which the top handrail 20 is arranged on the uppermost scaffolding plate 9 and the upper cloth 4, the arm 5 and the building 2 (2a, 2b) are assembled in a zigzag group. . The size (upward projection amount) of the building site 2a protruding upward from the uppermost fastening metal fitting 13 is set to a relatively small size h1, and the upward projection amount of the building site 2b is set to a relatively large size h2. . The building sites 2 a and 2 b are alternately arranged in the longitudinal direction of the cloth 4. Since the upward protrusion amount (dimension h1) of the building 2a is normally set to about 150 to 300 mm, when the preceding handrail column of each of the above-described embodiments is used, the upper holding tool is raised when the preceding handrail column is raised. 30 exceeds the upper end of the building site 2a, and the leading handrail pillar falls off the building site 2a.

  FIG. 12 shows a leading handrail column 21 that can be applied to such a single-ply scaffolding of a built-up zigzag group. In the preceding handrail pillar 21 shown in FIG. 12, the upper holding tool 30 is disposed at a position of a predetermined dimension h3 from the lower end of the preceding handrail pillar 21, and the dimension h3 is smaller than the upward projecting amount h1 of the building 2a. The upper holding tool 30 is set to a dimension that does not drop off from the building 2a when the leading handrail column 21 is raised. Each structure of the leading handrail column 21, the upper holding tool 30, the lower holding tool 40, and the telescopic handrail 50 is substantially the same as that of the first embodiment shown in FIGS. As shown in FIG. 4, the leading handrail 20 is formed on the uppermost work floor (scaffold plate 9).

FIG. 14 is an elevation view showing how to use the leading handrail 20.
As in the previous embodiments, the operator attaches the upper holding tool 30 of the leading handrail pillar 21 to the upper building 2b (FIG. 14A), and each telescopic handrail for handrails and middle rails. The 50 locking portions 53 or 54 (FIG. 6) are locked to the upper and lower protrusions 22, respectively, and the lower portion of the preceding handrail column 21 is gripped by fingers to push up the preceding handrail column 21 (FIG. 14B). The leading handrail column 21 is raised by guiding the building site 2b while slightly changing the inclination angle with respect to the building site 2b. When the lower end portion of the leading handrail column 21 rises beyond the binding metal 13 at the intersection of the building land 2b and the cloth 4, the operator houses the building land 2b in the lower holding tool 40 of the preceding handrail column 21. Thus, the opening / closing part 42 is closed, whereby the upper and lower holders 30, 40 are attached to the building 2 so as to be movable up and down. Lowering of the lower holding tool 40 is blocked by the fastening fitting 13, and the leading handrail column 21 is stopped at the level of the uppermost building 2b.

  Next, the operator attaches the locking portion 53 or 54 of each telescopic handrail 50 to the protrusion 22 of the second preceding handrail pillar 21 in order to attach another (second) preceding handrail pillar 21 to the adjacent building 2a. The upper holding tool 30 is attached to the building site 2a, and the leading handrail column 21 is pushed up (FIG. 8C). The second leading handrail column 21 rises along the building 2 a while the inclination angle is slightly changed by the rotation of the holder 30. The operator further attaches the lower holding tool 40 of the preceding handrail column 21 to the building site 2b when the lower end portion of the preceding handrail column 21 exceeds the binding fitting 13 (FIG. 8D). The lower holding tool 40 accommodates the building site 2a and closes the opening / closing part 42. Thus, the upper and lower holding tools 30, 40 are engaged with the building site 2 so as to be movable up and down. Since the lower holding tool 40 is prevented from descending by the fastening fitting 13, the leading handrail column 21 is stationary at the level of the uppermost building 2 a, and the telescopic handrail 50 is horizontally disposed between the preceding handrail columns 21. Extend.

  FIG. 15 is a rear view, a side view, and a sectional view taken along line VII-VII of the preceding handrail pillar 21 according to the fifth embodiment of the present invention. 16 is a perspective view of the preceding handrail pillar 21 shown in FIG. 15, and FIG. 17 is a cross-sectional view of the uppermost layer portion of the single-tube scaffold showing the usage pattern of the preceding handrail pillar 21. In addition, in FIG. 16, the master rope guide tool 70 arrange | positioned at the upper end part of the preceding handrail pillar 21 is abbreviate | omitting illustration. 15 to 17, components that are substantially the same as the components illustrated in FIGS. 2 to 14 are denoted by the same reference numerals.

  The preceding handrail 20 of the present example has a structure similar to the upper holding tool 30 attached to the preceding handrail column 21 so as to be rotatable about the horizontal axis, and a steel pipe binding bracket, as in the second embodiment. Side holder 40 '. Further, the leading handrail 20 has a configuration that can be adapted to a single-pipe scaffolding of a building zigzag group as in the fourth embodiment, and the upper holding tool 30 is the upper end level ML of the fastening bracket 13 (FIG. 17). To a predetermined dimension h4. The dimension h4 is smaller than the upward protrusion amount h1 (FIG. 13) of the building 2a, and is set to a dimension that prevents the upper holding tool 30 from falling off the building 2a when the preceding handrail pillar 21 is lifted.

  As shown in FIG. 15, the leading handrail pillar 21 of this example is deformed to the outside of the scaffold by a predetermined distance S from the central axis CL of the building 2a (indicated by the imaginary line), and includes a vertical column portion 21a, an inclined portion 21b, the downward extension part 21c, and the horizontal extension part 21d. The distance S is set to a dimension of about 150 mm.

  The vertical column portion 21a extends vertically in parallel with the building site, and a master rope guide tool 70 is disposed at the upper end of the vertical column portion 21a. The master rope guide tool 70 is supported by a pair of plate-like support members 71 fixed to the upper end portion of the vertical column portion 21a, a horizontal support shaft 72 attached to the support member 71, and the horizontal support shaft 72 so as to be rotatable. The master rope guide roller 73 and the master rope slip prevention member 74 fixed to the support member 71 are configured. In use, the master rope (not shown) is inserted into a master rope passage hole 75 formed in the master rope prevention member 74 and stretched in the longitudinal direction of the cloth 4 (FIG. 17). The master rope guide roller 73 supports the master rope so that it can be displaced in the longitudinal direction of the cloth 4.

  As in the above-described embodiments, the protrusion 22 constituting the locking means that can lock the telescopic handrail 50 is provided on the inner side surface of the vertical column portion 21a. A horizontal extension 21 d is attached below the protrusion 22. The horizontal extension portion 21d extends horizontally in the direction of the arm 5 (indicated by a virtual line), and the upper holding tool 30 is rotatably supported by the distal end portion of the horizontal extension portion 21d by the horizontal support shaft 27. The upper holder 30 has substantially the same structure as the upper holder (FIG. 4) shown in the first embodiment. The inclined portion 21b extends downward and inward from the lower end portion of the vertical column portion 21a, and the vertical downward extending portion 21c hangs from the lower end of the inclined portion 21b. The connecting portion between the vertical column portion 21a and the inclined portion 21b is generally located in the vicinity of the level ML, and the inclined portion 21b and the downward extending portion 21c are disposed on the lower side of the arm 5. A lower holding tool 40 'is attached to the lower extension portion 21c. Similarly to the second embodiment (FIG. 10), the lower holding tool 40 ′ has a structure similar to the steel pipe fitting, and a fixed holding portion 41 ′ fixed to the lower extension portion 21c, and a holding portion. An opening / closing part 42 ′ supported by a support part 43 ′ of 41 ′ and a locking mechanism 44 ′ for locking the opening / closing part 42 ′. The upper and lower holders 30 and 40 ′ are aligned on the central axis CL of the building 2. The upper holding tool 30 engages with the building 2 on the uppermost floor so that the upper holding tool 30 can be relatively displaced in the vertical direction, and the lower holding tool 40 ′ is fastened to a portion of the lower building 2, The leading handrail column 21 is fixed to the building 2 by the binding force with respect to 2.

  FIG. 17 shows a method of using the preceding handrail 20 composed of the preceding handrail column 21 and the telescopic handrail 50 (FIG. 6).

  FIG. 17A shows a state in which the uppermost building 2 and the arm 5 are assembled. The uppermost scaffold board is not yet attached. At this stage, an operator (not shown) on the lower work floor (scaffold board 9) performs the upper layer transfer work of the leading handrail 20. The worker releases the holding tools 30 and 40 ′ and releases the engagement between the holding tools 30 and 40 ′ and the building site 2.

  The worker further raises the leading handrail column 21 as shown in FIG. As shown in FIG. 13, the telescopic handrail 50 is locked to the handrail support column 21, and the telescopic handrail 50 tilts and expands and contracts as the preceding handrail column 21 rises. Since the arm 5 partially extends outside the building 2, it is desirable to raise the handrail column 21 along a trajectory that slightly expands outward from the scaffolding so that the telescopic handrail 50 does not interfere with the arm 5.

  When the leading handrail column 21 is raised to a predetermined level, the worker engages the upper holding tool 30 with the portion of the building 2 that extends to the upper side of the arm 5 as shown in FIG. The holder 40 ′ is fastened to the portion of the building 2 that is located below the arm 5, and the handrail column 21 is fixed to the building 2.

  FIG. 18 is a side view of the leading handrail column 21 according to the sixth embodiment of the present invention, and FIG. 19 is an enlarged perspective view showing the structure of the lower end portion of the leading handrail column 21. In FIG. 18 and FIG. 19, the same reference numerals are assigned to substantially the same components as those of the above-described embodiments.

  The preceding handrail column 21 has substantially the same upper structure as the preceding handrail column shown in FIG. 15 and is disposed on the inner surface of the preceding handrail column 21 and the parent rope guide tool 70 disposed on the upper end portion. And a protrusion 22. However, the preceding handrail column 21 of this example is made of a steel pipe having a circular cross section, and a rotation support portion 85 that supports the brace engaging tool 80 is formed below the preceding handrail column 21 as shown in FIG. The rotation support portion 85 constituting the brace engaging tool 80 has substantially the same diameter as the outer peripheral surface of the preceding handrail column 21, and the outer peripheral surface of the rotation support portion 85 rotates around the central axis of the preceding handrail column 21. . A pair of upper and lower brackets 82 are fixed to the rotation support portion 85 and integrally support the holding portion 81 through which the arm 5 can be inserted. The holder 81 is provided with a fixture 83 for fixing the holder 81 to the arm 5.

  The leading handrail column 21 further includes a horizontal connecting pipe 28. A U-shaped connector 29 of the connecting pipe 28 is connected to the lower end of the main body portion of the preceding handrail column 21. The connection tool 29 includes a pair of left and right flange portions 29 b extending on the lower end side surface of the column main body portion, and a web portion 29 c fixed to one end of the connection pipe 28. A pair of upper and lower fixing bolts 29a penetrates the flange portion 29b and the column main body portion, and the connector 29 is fixed to the lower end of the column main body portion.

  A lower holding tool 40 ′ is attached to the other end of the connecting pipe 28. The lower holding tool 40 ′ has a structure similar to that of a steel pipe tightening fitting, and a fixed holding portion 41 ′ fixed to the connecting pipe 28 and an opening / closing portion 42 supported by a support portion 43 ′ of the holding portion 41 ′. 'And a locking mechanism 44' for locking the opening / closing part 42 '. The lower holding tool 40 ′ is fastened to the portion of the building site 2.

  As shown in FIG. 18, the leading handrail pillar 21 is supported by a lower holding tool 40 ′ fastened to the building 2 and an arm engaging tool 80 engaged with the arm 5. When the leading handrail column 21 is moved to the uppermost layer, the lower holding tool 40 ′ and the arm engaging member 80 are released from the building 2 and the arm 5 and the telescopic handrail 50 is inclined as in the method shown in FIG. Then, the leading handrail column 21 is raised while being extended and contracted, and the lower holding tool 40 ′ and the brace engaging tool 80 may be fixed to the uppermost building 2 and the brace 5.

  20 and 21 are side views showing modifications of the preceding handrail pillar shown in FIG.

  In the preceding handrail pillar 21 shown in FIG. 20, the horizontal connecting pipe 28 and the U-shaped connector 29 are omitted, and the structure of the preceding handrail pillar 21 is simplified as a whole. That is, the column main body portion of the leading handrail column 21 has a form in which the lower end portion is bent at right angles to the inside of the scaffold, and the lower holding tool 40 ′ is fixed to the tip of the horizontal portion of the preceding handrail column 21 extending horizontally. The

  The structure of the preceding handrail pillar 21 shown in FIG. 21 is a structure in which the arm engagement tool 80 and the rotation support portion 85 are omitted, and the structure of the preceding handrail pillar shown in FIG. 20 is further simplified. The lower holding tool 40 ′ fixed to the front end of the horizontal portion of the leading handrail column 21 is firmly tightened to the building site 2, and the leading handrail column 21 is built by the binding force of the lower holding tool 40 ′ with respect to the building site 2. Fixed to ground 2.

  22 is a side view, a rear view, and a sectional view taken along line VIII-VIII of a preceding handrail pillar according to a seventh embodiment of the present invention. FIGS. 23 and 24 are a plan view and a plan view showing the structure of the upper and lower holders, respectively. It is a bottom view. In each figure, the same reference numerals are given to the components that are substantially the same as the components of the above-described embodiments.

  The preceding handrail pillar 21 of the present example includes an upper holding tool 130, a lower holding tool 140, a protrusion 22, and a master rope guide tool 70, as well as left and right auxiliary columns 120, a horizontal reinforcing material 121, and a cloth material engaging portion 150. Prepare. The auxiliary strut 120 and the horizontal reinforcing member 121 are fixed symmetrically to the main body portion of the preceding handrail pillar 21, and the cloth material engaging portion 150 is disposed at the lower end of each auxiliary strut 120. The cloth material engaging portion 150 includes a cloth material hanging tool 151 fixed to the lower end of the auxiliary column 120 and a detachable fixing pin 152 that opens and closes the lower surface opening of the hanging tool 151. The fixing pin 152 accommodates the cloth 4 (indicated by a broken line) in the cloth material 151 and holds the cloth 4 in the cloth 151.

  As shown in FIG. 23A, the upper holding tool 130 includes gripping tools 131 and 132 fixed to the cylindrical rotary tubes 135 and 136, and a stopper 134 that regulates the closed position of the gripping tools 131 and 132, It comprises a gripping tool fixing pin 133 that restrains the rotation of the gripping tools 131 and 132. The rotary tubes 135 and 136 are supported so as to be rotatable around the handrail column main body. The building site 2 penetrates the building site accommodation space 138 formed by the left and right grippers 131 and 132 and is held in the building site accommodation space 138. The distal end portion 133a of the fixing pin 133 passes through the locking holes 137 of the gripping tools 131 and 132, and prohibits the opening of the gripping tools 131 and 132. The base end portion 133b of the fixing pin 133 is supported by the handrail column main body so as to be vertically movable and rotatable. When the fixing pin 133 is pulled upward as shown by the broken line in FIG. 22A and the distal end portion 133a is pulled out from the locking hole 137 of the gripping tools 131 and 132, the gripping tools 131 and 132 are connected to the rotary tubes 135 and 136, respectively. By the rotation, as shown in FIG. 23 (B), it can be rotated around the vertical central axis of the handrail column body. The building site accommodation space 138 is opened by such rotation of the gripping tools 131 and 132, whereby the holding tool 130 can be disengaged from the building site 2 and detached from the building site 2.

  As shown in FIG. 24A, the upper holding tool 140 includes gripping tools 141 and 142 fixed to the cylindrical rotary tubes 145 and 146, and a stopper 144 that regulates the closed position of the gripping tools 141 and 142, It is comprised from the holding tool fixing pin 143 which restrains rotation of the holding tools 141 and 142. The rotary tubes 145 and 146 are supported so as to be rotatable around the handrail post body. The building site 2 passes through the building site accommodation space 148 formed by the left and right grippers 141 and 142 and is held in the building site accommodation space 148. The distal end portion 143a of the fixing pin 143 passes through the locking holes 147 of the gripping tools 141 and 142, and prohibits the opening of the gripping tools 141 and 142. The base end portion 143b of the fixing pin 143 is supported by the handrail column main body so as to be vertically movable and rotatable. 22A, when the fixing pin 143 is pulled upward and the distal end portion 143a is pulled out from the locking hole 147 of the gripping tools 141, 142, the gripping tools 141, 142 are connected to the rotating tubes 145, 146. By the rotation, as shown in FIG. 24 (B), it can be rotated around the vertical central axis of the handrail column body. The building space 148 is opened by such rotation of the gripping tools 141, 142, whereby the holder 140 can be disengaged from the building 2 and detached from the building 2.

  The fixing pin 133 is rotated by the rotation of the base end portion 133b with respect to the handrail column main body and the elastic deformation of the fixing pin 133 itself as shown in FIG. Swinging or turning about the axis) is allowed to some extent.

  FIG. 25 is a side view showing a state in which the handrail support column 21 is attached to the single pipe scaffold.

  The upper and lower holders 130 and 140 are attached to the building 2, and the cloth material engaging portion 150 is seated on the cloth 4. The vertical load of the leading handrail column 21 is substantially supported by the cloth 4, and the tilt of the leading handrail column 21 is restrained by the holders 130 and 140. The locking portions 53 or 54 (FIG. 6) of the telescopic handrails 50 for the handrail and the middle rail are respectively locked to the upper and lower protrusions 22.

  At the time of moving the leading handrail, the operator pulls the fixing pins 133 and 143 upward, rotates the gripping tools 131, 132, 141, and 142 to open the building housing spaces 138 and 148, and pulls the fixing pin 152, The lower surface opening of the cloth material hanging tool 151 is opened. Thereby, the holders 130 and 140 are disengaged from the building site 2, and the cloth material engaging part 150 is disengaged from the cloth 4. The operator further pushes up the leading handrail column 21 and engages the holding tools 130 and 140 with the upper building 2 as described above. When the leading handrail column 21 rises to a desired level, the cloth material engaging portion 150 is engaged with the upper cloth 4. As shown in FIG. 23 (C), the holder 130 can swing or rotate left and right around the vertical center axis of the handrail column body. The engaging part 150 engages with the cloth 4 relatively easily.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications or changes can be made within the scope of the present invention described in the claims. Is possible.

  For example, the telescopic handrail 50 is not limited to one or two stages, and may be arranged in three or more stages.

  In addition, when the interval in the column direction of the building 2 is set to a relatively small size, it is possible to arrange the leading handrail pillars 21 every other span.

  Further, the preceding handrail in the direction between the beams may be formed by the preceding handrail 20 of the present invention.

  Furthermore, in the present invention, the numbers of the first engaging portion, the second engaging portion, the third engaging portion, and the fixing portion are not limited to the above-described embodiments, and a larger number of engaging portions or fixing portions. It is also possible to provide the part on the handrail pillar.

  The leading handrail of the present invention is a leading handrail formed in the uppermost layer in a single pipe scaffold that is installed as a temporary scaffold for construction, assembly, maintenance, or management of construction, civil engineering, large equipment, large machine tools, etc. Preferably used. The leading handrail of the present invention can also be used as a handrail for a frame scaffold if desired.

It is the perspective view and elevation which show the whole structure of a single pipe | tube scaffold. It is an elevation view of the uppermost layer part of a single pipe scaffold which shows the composition of the preceding handrail concerning the 1st example of the present invention. FIG. 3 is a perspective view, a front view, and a side view of a preceding handrail column constituting the preceding handrail shown in FIG. 2. It is a top view, II line sectional view, II-II line sectional view, and III-III line sectional view which shows the structure of the rotation holder of a preceding handrail pillar. It is a top view, IV-IV sectional view, V-V sectional view, and VI-VI sectional view which show the structure of a fixed handrail pillar holding fixture It is the top view which shows the structure of an expansion-contraction handrail, a front view, and a partial expanded sectional view. It is a partial side view which shows the aspect which latches the latching | locking part of an expansion-and-contraction handrail to the protrusion of a preceding handrail pillar. It is an elevation which shows the usage method of a preceding handrail, and the work procedure at the time of a preceding handrail assembly is shown. It is an elevation view which shows the usage method of a prior handrail, and the procedure of the operation | work following the operation | work shown in FIG. 8 is shown. It is a perspective view, a front view, and a side view of a preceding handrail pillar according to a second embodiment of the present invention. It is a perspective view of the preceding handrail pillar concerning the 3rd example of the present invention. It is a perspective view, a front view, and a side view of a preceding handrail pillar according to a fourth embodiment of the present invention. It is an elevational view of the uppermost layer part of the single pipe scaffold showing the usage pattern of the leading handrail pillar shown in FIG. FIG. 13 is an elevation view showing a method of using the leading handrail shown in FIG. 12. It is the rear view, side view, and VII-VII sectional view taken on the front handrail pillar which concerns on 5th Example of this invention. It is a perspective view of the preceding handrail pillar shown in FIG. It is sectional drawing of the single-pipe scaffold uppermost layer part which shows the usage pattern of a preceding handrail pillar. It is a side view of the preceding handrail pillar concerning the 6th example of the present invention. It is an expansion perspective view which shows the structure of the lower end part of the preceding handrail pillar shown in FIG. It is a side view which shows the modification of the preceding handrail pillar shown in FIG. It is a side view which shows the other modification of the preceding handrail pillar shown in FIG. It is the side view, rear view, and VIII-VIII sectional view taken on the front handrail pillar which concerns on 7th Example of this invention. It is a top view which shows the structure of an upper holder. It is a bottom view which shows the structure of a lower holder. It is a side view which shows the state which attached the preceding handrail pillar to the single pipe | tube scaffold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single-tube scaffold 2 Building land 4 Cloth 5 Arm 7 7 Middle rail 9 Scaffolding board (work floor)
20 Leading handrail 21 Leading handrail pillar 22 Protrusion (locking means)
30, 130 Upper holder (first engaging portion)
31 Rotation holding part 32 Opening / closing part 40, 140 Lower holding tool (second engagement part)
40 'lower holder (fixed part)
41 fixed holding part 42 opening and closing part 50 telescopic handrail (handrail member)
70 Parent rope guide tool 80 Arm engagement tool (first engagement part)
150 Cloth material engaging part (2nd or 3rd engaging part)

Claims (15)

According to the progress of the construction work, in the temporary handrail of the temporary scaffolding that is provided in the temporary scaffolding that sequentially builds the upper building, and projects upward from the uppermost work floor,
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar is integrally connected to the building or the building so as to prevent the lowering of the preceding handrail pillar, and a first engaging portion that engages with the building so as to be relatively displaceable in a vertical direction. A second engaging portion that engages with the scaffold component; and a locking means that removably locks the locking portion of the handrail member, wherein the first engaging portion is a second engaging portion of the second engaging portion. A preceding handrail for a temporary scaffold, wherein the preceding handrail is disposed on the upper side and is supported by a preceding handrail column main body so as to be relatively rotatable. According to the progress of the construction work, in the temporary handrail of the temporary scaffolding that is provided in the temporary scaffolding that sequentially builds the upper building, and projects upward from the uppermost work floor,
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar includes a first engaging portion fixed to a scaffold component integrally connected to the building, and a second engaging portion engaged with the building to prevent the preceding handrail pillar from being lowered. And a locking means for removably locking the locking portion of the handrail member, wherein the first engagement portion is disposed on the upper side of the second engagement portion and is relative to the preceding handrail pillar body. A preceding handrail of a temporary scaffold characterized by being rotatably supported.   The preceding second of the temporary scaffold according to claim 1 or 2, wherein the second engaging portion is fixed to the building at a level below the uppermost work floor to which a preceding handrail is to be transferred. handrail.   The preceding first of the temporary scaffolding according to claim 1 or 2, wherein the first engaging portion is supported by the preceding handrail column so as to be rotatable around a vertical center axis and / or a horizontal axis of the preceding handrail column. handrail.   The temporary scaffold is a single-pipe scaffold, and is constructed by fastening each tubular body constituting a building site, arms and cloth with a fastening tool, and the scaffold component is the arms. Item 5. The preceding handrail of the temporary scaffold according to Item 2 or 4. According to the progress of the construction work, in the temporary handrail of the temporary scaffolding that is provided in the temporary scaffolding that sequentially builds the upper building, and projects upward from the uppermost work floor,
It is composed of a preceding handrail column attached in parallel to the building site, and a handrail member that can be locked to the preceding handrail column,
The preceding handrail pillar includes a fixing portion fixed to a building, and a locking means for detachably locking the locking portion of the handrail member, and the fixing portion is an uppermost layer to which the leading handrail is to be transferred. A preceding handrail of a temporary scaffold, which is fixed to the building at a lower level of the work floor and supports a preceding handrail pillar body.   The preceding handrail pillar according to any one of claims 1 to 6, wherein the preceding handrail pillar includes a safety belt mooring portion or a master rope guide portion capable of mooring a safety belt or a parent rope.   The second engaging portion is engaged with a building site so as to be relatively displaceable in the vertical direction, and is prevented from descending by a binding tool or a scaffold component member attached to the building. Leading handrail for temporary scaffolding as described in.   The preceding handrail of the temporary scaffold according to claim 1 or 2, wherein the second engaging portion is tightly coupled to the building site and prevents the leading handrail column from being lowered by a binding force with respect to the building site.   The said engaging part has a holding member which forms the recessed part which can accommodate a building, and an opening-and-closing member which prevents that the building house accommodated in the recessed part remove | deviates from a recessed part. The preceding handrail of the temporary scaffold as described in 2.   The preceding handrail pillar is deformed so as to project outward from the scaffold, and the first engagement portion is supported by a horizontal support member that extends from the preceding handrail pillar body to the inside of the scaffold. Item 14. The preceding handrail of the temporary scaffold according to any one of Items 1 to 3.   The handrail member includes a locking portion having a locking hole at both ends, and the locking means of the preceding handrail column has a horizontal shaft portion that can be inserted into the locking hole, and the horizontal shaft portion has a shaft A protrusion or tongue-like member protruding from the portion is provided, and the protrusion or tongue-like member transiently retracts into the shaft portion when the shaft portion is inserted into the locking hole of the handrail member. The preceding handrail of the temporary scaffold of any one of thru | or 11.   An intermediate rail made of a handrail member is further provided, and the preceding handrail pillar includes a second locking means capable of locking a locking portion of the handrail member of the middle rail at an intermediate height portion. Item 13. The preceding handrail of the temporary scaffold according to any one of Items 1 to 12.   The preceding handrail of the temporary scaffold according to any one of claims 1 to 13, wherein the handrail member is a telescopic handrail having a double-pipe structure assembled in a telescoping manner. The preceding handrail of a temporary scaffold according to claim 1, wherein the preceding handrail column includes a third engaging portion that engages with a scaffold component member integrally connected to a building site.

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