JP2016160663A - Guard post - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessive bending stress, shear stress and others from acting on a base of a guard post by reducing a bending moment that acts on the base of the guard post.SOLUTION: A guard post (1) comprises: a base tube (2), which intersects with a parapet section (W) of an architectural structure (A) and substantially extends in a horizontal direction; a brace (3), which extends upward from the base tube; and a mooring tools (4, 5), which hold the parapet section between them in order to fix the base tube to the parapet section. The base tube is disposed on a top face of the parapet section. Supporting points (F) that support the base tube are formed by contact pressure between the parapet section and an abutting part of the mooring tool. A junction between the brace and the base tube is disposed at a region immediately above the parapet section. The brace is connected to the base tube so that a part extended from a center line (CL) of the brace passes through a region between supporting points.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a guard post, and more particularly, to a guard post that forms a fall guard on a roof or roof parapet of a building.

  In the repair and renovation of buildings such as apartment houses, in many cases, the roof or roof waterproof layer is repaired or refurbished. In such repair / renovation work, it is necessary for an operator to perform various work such as waterproofing work and painting work on a rooftop or roof surface that does not have an existing handrail. In general, parapets (walls) are arranged on the outer edge zone or outer peripheral zone of a building roof or the like for the completion or storage of a waterproof layer, but the parapet is a low hand with a height of about 450 mm to 700 mm. The sliding is only formed on the outer periphery such as the rooftop. For this reason, as a safety measure or safety measure for work on the rooftop or the like, it is necessary to form a temporary fall protection work on the outer edge of the rooftop or the like to ensure the safety of work at high places.

  As this type of crash prevention work, guard posts (also referred to as “stanns”) that are detachably installed on a parapet portion such as a rooftop of a building are known (Patent Documents 1 to 4). Usually, a large number of guard posts are arranged on the parapet portion at intervals. As described in “Chapter 6” of “Temporary Equipment Certification Criteria and Its Explanation (6th Edition)” (Non-Patent Document 1), “Guard Post” It is necessary that the mounting strength, bending rigidity, etc. of the guard post conform to the standards of the predetermined “slip test” and “deflection and bending strength test”.

  FIG. 6 is a partial cross-sectional view of the rooftop portion schematically showing the configuration of the conventional guard post P. As shown in FIG. FIG. 6 shows a parapet portion W and a structure K of a building A having a reinforced concrete (RC) structure, and a waterproof layer J, a heat insulating material I, and a waterproof presser constructed in association with the parapet portion W and the structure K. Concrete M, welded wire mesh N, expansion joint Q, extrusion-molded cement board U and the like are shown. Each component of the guard post P is conceptually shown as a single line in FIG. 6 for the sake of simplicity.

  The guard post P includes a base B that is detachably attached to a parapet portion W provided on the roof of the building A or the outer edge of the roof, and a column portion S that extends in the vertical direction. The guard posts P are disposed at a distance from the parapet portion W. A horizontal member E such as a single pipe (steel pipe) for temporary scaffolding is moored to each column portion S as an upper rail and a lower rail of a handrail so as to bridge adjacent guard posts P. Thus, the guard post P and the horizontal member E assembled in the shape of a handrail form a fall protection work along the parapet portion W in the outer peripheral zone of the roof or roof.

Utility Model Registration No. 3083493 Utility Model Registration No. 3184052 JP 2013-221300 A Utility Model Registration No. 3190038

“Temporary Equipment Certification Criteria and Explanations (6th Edition)” (issued by the Temporary Industrial Association on September 1, 2013)

  As described in Patent Documents 1 to 4, the conventional guard post P is configured to arrange the column portion S in the building inner region α of the parapet portion W, and the base B is an upper region of the parapet portion W. The column portion S projects from the inner projecting portion Ba of the base B upward. This is considered to be caused by considering the workability of the guard post installation work, the situation or state when the guard post is tilted, and the positional or structural interference between the parapet portion W and the column portion S. .

  However, in the guard post P having such a configuration, the center of gravity G of the guard post P is located at a position that is relatively large and deviated in the horizontal direction (plan view) from the fulcrum center C of the base B (the midpoint of the fulcrum F). Therefore, a relatively large bending moment M caused by the vertical load Lv of the horizontal member E and the column portion S always acts on the base B. When the operator's weight or the like further acts on the horizontal member E, the bending moment M acting on the base B further increases as the vertical load Lv increases.

  Further, the safety of the guard post P needs to be evaluated by predetermined horizontal loads Lh and Lh ′ acting on the top of the column portion S in order to conform to the safety standard (Non-Patent Document 1). Note that the horizontal load Lh and the horizontal load Lh ′ are loads that selectively act in the opposite direction, and the guard post P is greatly tilted or bent or dropped from the parapet portion W with respect to any load. Etc. should be avoided.

  However, when the bending moment M acting on the base B increases, excessive bending stress, shear stress, etc. act on the base B in combination with the horizontal loads Lh and Lh ′, and the base B and the parapet portion W contact each other. Since an excessive structural load may be imposed on the portion (fulcrum F), it is desirable to reduce such a structural load and improve the proof stress or durability of the guard post P.

  The present invention has been made in view of such circumstances, and an object of the present invention is to bend a guard post that forms a fall protection work on a roof of a building or a parapet on a roof, and acts on the guard post. The object is to reduce the moment and prevent excessive bending stress, shearing stress and the like from acting on the base of the guard post.

In order to achieve the above object, the present invention is to fix a base tube to a parapet portion, a base tube extending perpendicularly to the parapet portion of the building and extending in a substantially horizontal direction, a column extending upward from the base tube, and the base tube. In a guard post having a mooring tool for sandwiching the parapet portion,
The base pipe is disposed on an upper surface of the parapet portion, and a fulcrum supporting the base pipe is formed by a contact pressure between the parapet portion and an abutting portion of the anchoring tool. A guard post is disposed in a region immediately above the parapet portion, and the support post is joined to the base pipe so that an extension portion of a center line thereof passes through a region between the fulcrums. provide.

  According to the guard post having the above configuration, since the joint portion between the support column and the base tube is located in the region directly above the parapet portion, the bending moment acting on the base tube is determined whether the operator's weight or the like acts on the support column. Regardless of, it is greatly reduced. For this reason, a phenomenon such as slipping hardly occurs at the fulcrum of the guard post, and therefore the guard post can be reliably supported by the parapet portion.

  Further, since the bending moment acting on the base tube is reduced, the scaffold plate or the like can be supported by the base tube or its extension. Therefore, according to the guard post having the above-described configuration, the working temporary scaffolding or the temporary passage can be formed in the outer peripheral zone of the building rooftop portion or the like by laying the scaffolding plate on the base pipe or its extension.

  Preferably, the base tube is seated on the upper surface of the parapet portion and is supported on the upper surface of the parapet portion. According to such a configuration, the support force (reaction force) of the guard post can be additionally ensured by the upper surface of the parapet portion.

  More preferably, the base tube has a support member that expands the contact area between the tube of the base tube and the parapet portion. The support member transiently stabilizes the posture of the guard post in a state where the base tube is temporarily placed on the parapet portion (a state before being fixed by the mooring tool). It is also possible to form an additional fulcrum supporting the base tube by means of a bearing member. If desired, a spacer, cushioning material or the like is interposed between the base tube or support member and the upper surface of the parapet portion. Desirably, the bearing member is integrally attached to the base tube and has a horizontal or flat lower surface.

  Preferably, the mooring device is composed of a fixed mooring device fixed to the base tube and a movable mooring device movable or movable along the base tube. According to such a structure, the parapet part of various sizes and forms can be reliably clamped by the mooring tool by adjusting or changing the position of the movable mooring tool.

  According to the above configuration of the present invention, in the guard post that forms the fall protection work on the roof or roof parapet of the building, the bending moment acting on the guard post is reduced, and excessive bending stress, shear stress, etc. are guarded. It can prevent acting on the base of the post.

FIG. 1 is a side view and a partially enlarged front view showing the structure of a guard post according to a preferred embodiment of the present invention. 2 is a bottom view and a plan view of the guard post shown in FIG. FIG. 3 is an enlarged side view showing the structure of a mooring fixture for fixing the guard post to the parapet portion. FIG. 4 is a partial cross-sectional view of the rooftop portion schematically showing the configuration of the guard post shown in FIGS. 1 to 3. FIG. 5 is a side view showing another usage pattern of the guard post. FIG. 6 is a partial cross-sectional view of a rooftop portion schematically showing a configuration of a conventional guard post.

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

  1A and 1B are a side view and a partially enlarged front view showing the structure of a guard post according to a preferred embodiment of the present invention. FIG. 2A and FIG. FIG. 2 is a bottom view and a plan view of the guard post shown in FIG. 1. FIG. 3 is an enlarged side view showing the structure of a mooring fixture for fixing the guard post to the parapet portion.

  1 and 2 show a guard post 1 attached to a parapet (saddle wall) portion W of a building A. FIG. The building A is a building having a reinforced concrete (RC) structure, and the parapet portion W is integrated and vertical from the reinforced concrete structure K (concrete slab, beam, etc.) on the top layer of the building on the roof or the outer edge zone of the roof. Extends upward. The parapet portion W forms a rising portion of the waterproof layer J for finishing or fitting of the waterproof layer J on the structure K, and a low handrail of about 450 mm to 600 mm in height is formed on the outer periphery of the building A To do. The upper portion of the parapet portion W has a jaw portion Wa protruding inward of the building, and the upper surface depth dimension X1 of the parapet portion W is normally set to a dimension of about 300 to 500 mm. In addition, in FIG. 1, the heat insulating material I constructed | assembled in connection with the parapet part W, the structure K, and the waterproof layer J, waterproofing press concrete M, the welded wire mesh N, the expansion joint Q, the extrusion molding cement board U, etc. are shown. Although shown, the components of the building roof or building roof are well known to those skilled in the art and will not be described.

  As shown in FIG. 1A, the guard post 1 has a steel base 2 extending in a direction perpendicular to the parapet portion W, a steel support 3 extending vertically upward from the base 2, and the base 2 fixed to the jaw Wa. It comprises a fixed mooring tool 4 and a movable mooring tool 5. The base 2 is composed of a horizontal steel pipe 20 having a circular cross section, and the column 3 is composed of a vertical steel pipe 30 having a circular cross section. A binding tool 31 such as a temporary scaffolding clamp member is attached to the vertical steel pipe 30 with an interval in the vertical direction, and a steel pipe 6 such as a single temporary scaffolding pipe is horizontally attached to the column 3 by the binding tool 31.

  As shown in FIG. 2 (B), a plurality of guard posts 1 are arranged on the parapet portion W at intervals. The steel pipe 6 is constructed between adjacent columns 3 and forms handrails (upper rail and lower rail) extending in parallel with the parapet portion W in the upper region of the parapet portion W. If desired, a metal or wooden scaffolding plate 7 is laid on the base 2 as shown in phantom lines (dashed lines) in FIGS. 1 (A) and 2 (B) and laid between the adjacent bases 2. May be.

  The lower end of the vertical steel pipe 30 is firmly fixed to the upper surface of the base 2 by welding or the like. A triangular steel reinforcing plate 32 that reinforces the joint between the steel pipes 20 and 30 is fixed to the steel pipes 20 and 30 by welding or the like. The joint portion of the steel pipes 20 and 30 is positioned in a band within the range of the upper surface depth dimension X1 of the parapet portion W, that is, a zone β immediately above the parapet portion W. A support member 21 that expands the contact area between the horizontal steel pipe 20 and the parapet portion W is attached to the lower surface of the horizontal steel pipe 20 immediately below the vertical steel pipe 30. The support member 21 transiently stabilizes the posture of the guard post 1 in a state where the horizontal steel pipe 20 is temporarily placed on the parapet portion W (a state before the base portion 2 is fixed to the jaw portion Wa by the anchoring tools 4 and 5). Functions as a posture stabilization means. The support member 21 is made of a steel material having a groove shape or a concave cross section, and is fixed to the lower side of the horizontal steel pipe 20 by fixing means such as welding. The support member 21 has a horizontal flat surface 21a, and the flat surface 21a is seated on the upper surface of the parapet portion W.

  A large number of positioning holes 22 are formed in the horizontal steel pipe 20 at predetermined intervals. The positioning holes 22 are formed in the pipe wall portions on both sides of the horizontal steel pipe 20 in pairs. As shown in FIG. 1B, the toggle pin 81 of the locking tool 8 constituting the movable anchoring tool 5 is inserted into the positioning hole 22. As shown in FIG. 2, the locking tool 8 has a structure in which a pair of toggle pins 81 are interconnected by a connecting portion 80.

  As shown in FIG. 3, the movable anchoring tool 5 has a movable tube 50 that can move on the horizontal steel tube 20. The movable tube 50 is made of a steel short tube having a circular cross section. The horizontal steel pipe 20 penetrates the movable pipe 50, and the movable pipe 50 slides in the axial direction of the horizontal steel 20. A pin insertion hole 51 into which the toggle pin 81 can be inserted is formed in the tube wall portions on both sides of the movable tube 50. By aligning the pin insertion hole 51 with the positioning hole 22, the toggle pin 81 can be inserted into the pin insertion hole 51 and the positioning hole 22. The toggle pin 81 penetrating the pin insertion hole 51 and the positioning hole 22 functions to fix the relative positions of the movable tube 50 and the horizontal steel tube 20. On the other hand, by pulling out the toggle pin 81 from the pin insertion hole 51 and the positioning hole 22, the movable anchoring tool 5 can be moved or moved entirely along the horizontal steel pipe 20 as shown by a broken line in FIG. . Thus, the relative position of the mooring tools 4 and 5 can be adjusted according to the position of the movable mooring tool 5, so that the mutual distance X2 between the mooring tools 4 and 5 can be appropriately set and changed in accordance with the depth dimension X1 of the parapet portion. it can.

  FIG. 3 shows a state in which the movable anchoring tool 5 is moved to the column 3 side and the toggle pin 81 of the locking tool 8 is inserted into the positioning hole 22 closest to the fixed anchoring tool 4. Since each part structure of the anchoring tools 4 and 5 is described in detail in FIG. 3, each part structure of the anchoring tools 4 and 5 will be described with reference to FIG. 3.

  The anchoring tools 4 and 5 have adjuster bolts 42 and 52 provided with contact portions 43 and 53, respectively. The abutting portions 43 and 53 facing each other are configured to contact the parapet portion W under pressure and sandwich the parapet portion W. FIG. 3A shows a state in which the adjuster bolts 42 and 52 are relaxed and the mutual distance X2 between the contact portions 43 and 53 is maximized. FIG. 3B shows a state in which the adjuster bolts 42 and 52 are rotated in the tightening direction and the mutual distance X2 between the contact portions 43 and 53 is reduced to the minimum. In addition, the central axis line (extension line) CL of the vertical steel pipe 30 passes through the region γ immediately below the columns with the interval X2.

  The adjuster bolts 42 and 52 include shaft portions 44 and 54 with external screws each having a tip integrated with the contact portions 43 and 53, and plain washers 45 and 55 attached to the base end portions of the shaft portions 44 and 54, It consists of nuts 46 and 56 fixed to plain washers 45 and 55. The shaft portions 44, 54 are screwed into high nuts 48, 58 integrated with the lower ends of the steel brackets 47, 57 and penetrate the high nuts 48, 58. The upper end portions of the steel brackets 47 and 57 are fixed to the lower end surface of the horizontal steel pipe 20. The steel brackets 47 and 57 hang from the lower end surface of the horizontal steel pipe 20.

  The steel bracket 57 includes a mooring wire 9 for preventing the locking tool 8 from dropping off or being lost. The wire 9 is made of, for example, a steel wire, and the loop portion 91 formed at one end of the mooring wire 9 is moored in the mooring hole 59 of the steel bracket 57 and is formed at the other end of the mooring wire 9. The loop portion 92 is anchored in the anchoring hole 82 of the locking tool 8 via the ring member 93.

  Next, the usage pattern of the guard post 1 configured as described above will be described.

  As shown in FIG. 1 (A), the guard post 1 is arranged or placed on the upper surface of the parapet portion W and the flat surface 21a of the support member 21 is seated on the parapet portion W. Positioned on W. The contact portion 43 (FIG. 3) of the fixed mooring tool 4 is disposed at a position slightly separated from the outer surface (surface on the outer wall surface side) of the parapet W. The movable anchor 4 is moved to a position close to the jaw Wa as indicated by an arrow in FIG. 1A and is locked to the horizontal steel pipe 20 by the lock 8. As a result, the abutment portion 53 (FIG. 3) of the anchoring tool 5 is disposed at a position slightly separated from the inner surface (the roof side or the roof-side surface Wc) of the jaw portion Wa.

  The adjuster bolts 42 and 52 are fastened to the high nuts 48 and 58 by rotating the nuts 46 and 56 with an appropriate tool as indicated by an arrow in FIG. As a result, the contact portions 43 and 53 strongly press the parapet portion W, and the parapet portion W is firmly held between the pair of contact portions 43 and 53 under the tightening pressure of the adjuster bolts 42 and 52. In such a state, the contact portion between the parapet portion W and the contact portions 43 and 53 constitutes a pair of fulcrums F, and the guard post 1 has a parapet portion unless a phenomenon such as slippage occurs at the fulcrum F. Stable support by W.

  FIG. 4 is a conceptual diagram schematically showing such a support structure for the guard post 1.

  As shown in FIG. 4A, the vertical load Lv of the steel pipe 6 and the column 3 acts on the base 2 in the zone β immediately above the parapet portion W. The bending moment M acting on the base 2 is extremely small regardless of whether the operator's weight or the like acts on the steel pipe 6. For this reason, a phenomenon such as slip is unlikely to occur at the fulcrum F, and therefore the guard post 1 can be reliably and stably supported by the parapet portion W. Such structural stability of the guard post 1 can be obtained similarly when the guard post 1 is attached to the parapet portion W in the reverse direction as shown in FIG.

  Further, since the bending moment M acting on the base 2 is reduced, the base 2 can support the vertical load Lv ′ of the scaffolding plate 7 laid on the extended portion of the base 2 as shown in FIG. it can. That is, according to the guard post 1 configured as described above, the scaffolding plate 7 is laid on the base 2 (on the horizontal steel pipe 20) along the parapet portion W as shown by the phantom line (dashed line) in FIG. A temporary scaffold or a temporary passage can be formed in the building A.

  FIG. 5A is a side view showing another usage pattern of the guard post 1. FIG. 5A shows a state in which the guard post 1 having the above-described configuration is attached to the parapet portion W having a configuration without the jaw portion Wa (FIG. 1). FIG. 5B shows a parapet portion W in a state before the guard post 1 is attached (a normal state before repair work). Note that, in FIG. 5, the same reference numerals are assigned to substantially the same or equivalent components or components as the components or components shown in FIGS. 1 to 4.

  As shown in FIG. 5, in the parapet portion W configured not to have the jaw portion Wa (FIG. 1), the edge of the waterproof layer J is subjected to rain or end treatment with a drained metal O or the like. Further, a metal headboard Wb is attached to the upper end portion of the parapet portion W, for example, as shown in FIG. The metal headboard Wb is removed from the parapet portion W before the guard post 1 is attached to the parapet portion W. The upper surface depth dimension X1 (FIG. 5A) of the parapet portion W is relatively small, about 150 mm to 200 mm, and the height of the parapet portion W is about 400 mm to 600 mm. FIG. 5A shows a drainage drain D for draining rainwater on the roof or roof.

  As shown in FIG. 5A, the guard post 1 is mounted on the parapet portion W by placing the horizontal steel pipe 20 on the upper surface of the parapet portion W and seating the flat surface 21a of the support member 21 on the parapet portion W. Is positioned. Similar to the above-described usage pattern, the contact portion 43 (FIG. 3) of the fixed mooring tool 4 is disposed at a position slightly separated from the outer surface of the parapet portion W. Further, the movable anchoring tool 5 is moved to a position close to the rooftop surface of the parapet portion W as shown by an arrow in FIG. 5A and is locked to the horizontal steel pipe 20 by the locking tool 8.

  As in the above-described usage pattern, the nuts 46 and 56 (FIG. 3) are rotated by an appropriate tool, and the contact portions 43 and 53 (FIG. 3) of the adjuster bolts 42 and 52 (FIG. 3) are moved to the high nuts 48 and 58. By tightening, the parapet portion W can be strongly pressed by the contact portions 43 and 53, and the parapet portion W can be firmly held by the contact portions 43 and 53. In such a state, the contact portion between the parapet portion W and the contact portions 43 and 53 constitutes a pair of fulcrums F, and the guard post 1 has a parapet portion unless a phenomenon such as slippage occurs at the fulcrum F. Stable support by W. 5A, a scaffold plate 7 can be laid on the base 2, and a temporary scaffold or a temporary passage along the parapet portion W can be formed in the building A.

  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, in the above embodiment, the guard post of the present invention is attached to the parapet portion of a building having a reinforced concrete structure. However, the guard post of the present invention has a steel structure or a steel reinforced structure (S structure or SR structure). It is also possible to attach to the parapet part of the building.

  Moreover, in the said Example, although the steel pipe of circular cross section is used as a base and a support | pillar, you may use a metal pipe etc. of another kind, a cross section, or a material as a base and a support | pillar.

  Furthermore, the support post of the guard post may be locked with an extendable handrail member, a brace or the like, or a mooring device for mooring a safety belt or a rope may be attached.

  In order to further improve the rigidity of the guard post, a reinforcing member such as a diagonal member or a cane may be connected to the base portion and the support column.

  The present invention applies to a guard post that forms a fall guard on a roof or rooftop parapet of a building. According to the present invention, the bending moment acting on the guard post can be reduced, and excessive bending stress, shear stress, etc. can be prevented from acting on the base of the guard post. Is remarkable.

DESCRIPTION OF SYMBOLS 1 Guard post 2 Steel base 3 Steel prop 4 Fixed mooring tool 5 Mooring mooring tool 6 Steel pipe (handrail)
7 Scaffolding plate 8 Locking tool 9 Mooring wire 20 Horizontal steel pipe 21 Bearing member 22 Positioning hole 30 Vertical steel pipe 42, 52 Adjuster bolt 43, 53 Abutting area α Building inner area β Parapet section area γ Immediately below strut A area (Building)
C fulcrum center F fulcrum G center of gravity W parapet part Lh horizontal load Lv vertical load X1 depth dimension X2 interval

Claims (5)

A base tube extending in a direction substantially perpendicular to the parapet portion of the building and extending in a substantially horizontal direction; a post extending upward from the base tube; and a tether for clamping the parapet portion to fix the base tube to the parapet portion. In the guard post,
The base pipe is disposed on an upper surface of the parapet portion, and a fulcrum supporting the base pipe is formed by a contact pressure between the parapet portion and an abutting portion of the anchoring tool. A guard post, wherein a joint portion is disposed in a region immediately above the parapet portion, and the support column is joined to the base pipe so that an extension portion of a center line thereof passes through a region between the fulcrums.   The guard post according to claim 1, wherein the base pipe is seated on an upper surface of the parapet portion and is supported on the upper surface of the parapet portion.   A support member that transiently stabilizes the posture of the guard post in a state in which the base tube is temporarily placed on the parapet portion while the contact area between the tubular body of the base tube and the parapet portion is temporarily placed on the base tube. The guard post according to claim 2, wherein the guard member is integrally attached to the base tube and has a horizontal or flat lower surface seated on an upper surface of the parapet portion.   The said mooring tool is comprised from the fixed mooring tool fixed to the said base pipe | tube, and the movable mooring tool which can move or transfer along this base pipe | tube. The guard post according to item 1.   The guard post according to any one of claims 1 to 4, wherein a scaffold plate is laid on the base pipe, and a temporary scaffold or a temporary passage is formed along the parapet portion.

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