JP4077464B2 - Safety handrail - Google Patents

Description

  The present invention relates to a safety handrail that is attached as a temporary temporary handrail of a newly installed upper stage side scaffolding plate from an existing lower stage side scaffolding plate when a frame scaffold is assembled in a multistage shape at a construction work site.

  As a conventional safety handrail of this type, there is one described in Patent Document 1, for example, which is shown in FIG. This safety handrail T has a pair of leg posts 1, 1 and a horizontal frame 2 connecting the upper ends of both leg posts 1, 1 and a gate-shaped building frame 4 (see FIG. 1) composed of a reinforcing frame 3. A handrail for attaching to a frame scaffold that is assembled in a multi-stage manner while spanning a scaffolding plate 6 (see FIG. 1) between the horizontal members 2 and 2 of both building frames 1 and 1, The handrail body 7 formed by the upper and lower horizontal frames 12 and 13 and the vertical and horizontal middle rails 14a, 14b and 14c, and disposed between the opposing pillars 11 and 11 of both building frames 4 and 4 (see FIG. 1), It is comprised from the attachment means which attaches the handrail main body 7 to the pedestals 11 and 11 which both frame frames 4 and 4 oppose. The attachment means is provided at a lower part of each vertical frame 11 of the handrail body 7, and is provided at a positioning hook 10 that is hooked on the horizontal member 2 of the building frame 4 and at a lower end portion of each vertical frame 11. A lower fixing bracket 8 for fixing the handrail main body 7 to the upper side of the pedestal 11 of the building frame 4, and an upper end portion of each vertical frame 11, and the handrail main body 7 is attached to the pedestal 1 of the upper stage building frame 4. It consists of an upper fixing bracket 9 to be fixed.

By the way, in order to ensure the safety at the time of use, such a safety handrail is subjected to a fall prevention performance test based on a certain use standard, and only the one adapted to this test can be used. The drop prevention performance test shown in FIG. 12 is a drop test to the side of the scaffolding board. As can be seen from FIGS. 12A and 12B, a safety handrail is attached to the test jig Z (framework scaffold). T is attached, and the hook F of the lanyard Y of the safety belt A is hooked at a predetermined position (20 cm from the end) of the upper horizontal frame 12 of the safety handrail T, and attached to the tip of the lanyard Y, for example, 100 kg The weight W is dropped from a predetermined height position 30 cm away from the safety handrail T and 30 cm away from the end of the wives side of the scaffold board 6 (90 cm height from the scaffold board 6) to prevent the fall. Check for presence. The length of the lanyard Y is 1.7 m, and the height of the scaffold board 6 from the ground is 3.425 m.
JP 2003-343079 A

  Therefore, when the conventional safety handrail as shown in FIG. 13 (a) described in Patent Document 1 is used and the fall prevention performance test as shown in FIG. 12 is performed, that is, the length is 1.7 m. The hook F of the safety belt A with a weight W of 100 kg attached to the tip of the lanyard Y is attached to the upper horizontal frame 12 of the handrail main body 7 shown in FIG. When a predetermined impact tensile load in the inner direction is applied, the vertical frame 11 of the handrail body 7 is hooked by the positioning hook 10 as shown by the phantom line on the lower side, that is, in FIG. The weight W may be bent from the portion where it falls and fall to the ground. At this time, the hook F slides on the upper horizontal frame 12 of the handrail main body 7 and is hooked on the upper fixing bracket 9 at the upper end of the vertical frame 11. In this state, the positioning hook 10 on which the vertical frame 11 is on the lower side. Therefore, although the height from the ground to the scaffolding plate 6 is 3.425 m, the weight W at the tip of the lanyard Y falls to the ground.

  The fact that the weight W falls to the ground in this way is a very fatal problem because the operator falls to the ground. In the present invention, in view of this problem, when a predetermined impact tensile load in the inner direction of the handrail is applied to the upper horizontal frame 12 side with the hook F of the safety belt A attached to the upper horizontal frame 12 of the handrail body 7. The vertical frame 11 of the handrail main body 7 is not bent at the lower end side, but is bent at the required height position on the upper side of the vertical frame 11 positioned above the mounting position of the horizontal center rail 14a. An object of the present invention is to provide a safety handrail T that can prevent a person from falling on the ground.

  Means for solving the above-described problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is a lateral connection between a pair of leg posts 1 on both sides and the upper ends of both leg posts 1, 1. A safety handrail attached to a frame scaffolding that is assembled in a multi-stage manner, with the scaffolding plate 6 being bridged between the horizontal frames 2 and 2 of the two building frames 4 and 4 with the building frame 4 made of the frame material 2 facing each other, A handrail body formed between left and right vertical frames 11, 11, upper and lower horizontal frames 12, 13 and vertical and horizontal center rails 14 a, 14 b made of steel pipes, and disposed between opposed pedestals 1, 1 of both building frames 4, 4. 7 and a safety handrail comprising a mounting means B for detachably attaching the handrail main body 7 to the opposing pedestals 1 and 1 of the two building frames 4 and 4, the left and right vertical frames 11 of the handrail main body 7 are connected to the horizontal center rail. 14a is divided into two at the upper required height position above the mounting position, and the split end 11 , 11b, a plate P made of steel plate is inserted so that the plate surface faces the inside / outside direction of the handrail, and this plate piece P is inserted into the upper side divided end 11a and the lower side divided end 11b of the vertical frame. The hook F of the safety belt A to be worn by the operator is attached to the upper horizontal frame 12 of the handrail main body 7 by being welded and fixed to the upper horizontal frame 12 in a predetermined impact tensile direction in the handrail inner direction. The plate piece P is bent between the split end portions 11a and 11b of the vertical frame 11 when a load is applied.

  According to a second aspect of the present invention, in the safety handrail according to the first aspect, the hook F of the safety belt A to be worn by the worker M is provided at a corner side required portion of each vertical frame 11 and the upper horizontal frame 12 of the handrail main body 7. Is attached to the upper horizontal frame 12 of the handrail main body 7 in order to hold the hook F so that the hook F is not damaged when a predetermined impact tensile load in the inner direction of the handrail is applied to the hook F. The diagonal member 15 made of a steel material having a lower bending strength than the upper horizontal frame 12 is integrally attached.

  The effect of the invention by the above-described solution means will be described with reference numerals in the embodiments described later. According to the safety handrail T of the invention according to claim 1, the left and right vertical frames 11 of the handrail main body 7 are connected to the horizontal center rail. 14a is divided into two at the required height position on the upper side above the mounting position, and the steel plate P is placed between the split end portions 11a and 11b so that the plate surface faces the inside / outside direction of the handrail. Since this plate piece P is welded and fixed to the upper-side divided end portion 11a and the lower-side divided end portion 11b of the vertical frame, the safety handrail T is used as shown in FIG. When the fall prevention performance test is performed, the upper horizontal frame 12 side with the hook F of the safety belt A having a weight W of, for example, 100 kg attached to the tip of the lanyard Y is attached to the upper horizontal frame 12 of the handrail body 7. When a predetermined impact tensile load is applied to the inside of the handrail, 11 divided ends 11a, results in the plate piece P is bent between 11b, as a result weight W at the tip portion of the lanyard Y is not able to fall from the scaffolding plate 6 to the ground, a state of suspended.

  Accordingly, when the worker M is working with the hook F of the safety belt A attached to his / her body attached to the upper horizontal frame 12 of the handrail body 7, the worker M slides his / her foot from the scaffold plate 6. Even if the vertical frame 11 of the handrail main body 7 is bent downward from the plate piece P between the divided end portions 11a and 11b, the worker can fall to the ground. Can be avoided.

  According to the invention of claim 2, the hook F of the safety belt A worn by the worker M on his / her body is attached to the inner side of the diagonal member 15 of the upper horizontal frame 12 of the handrail body 7. While working, the worker M slipped from the scaffolding plate 6 and fell into a state of falling, and on the hook F of the safety belt A in the handrail inner direction corresponding to the test load of the wife side drop test. When a predetermined impact tensile load is applied outward from the end of the handrail side, the hook F slides toward the end along the upper horizontal frame 12, but is caught by the diagonal member 15 during the sliding, The above sliding is prevented, so that the impact tensile load acts on the diagonal member 15 to deform the diagonal member 15 whose bending strength is weaker than that of the frames 11 and 12. The deformation of the diagonal member 15 reduces the impact when the hook F is hooked on the diagonal member 15, so that the hook F is in a normal state at the position where it is hooked on the diagonal member 15 without being broken and thus without opening the mouth. It is possible to prevent the worker M from falling.

  A preferred embodiment of the present invention will be described below with reference to the drawings. (A) and (b) of FIG. 1 are explanatory perspective views showing a mounting method of a safety handrail T according to the present invention. a) is a front view of the safety handrail T, (b) is a side view, and (c) is a plan view. As shown in FIGS. 1 (a) and 1 (b), the frame scaffold is a gate composed of a pair of leg posts 1 and 1 and a horizontal frame 2 connecting the upper ends of both leg posts 1 and 1, and a reinforcing frame 3. Shaped building frames 4 are arranged opposite to each other at regular intervals, a scaffolding plate 6 is bridged between the opposing horizontal members 2 and 2 of the two building frames 4 and 4, and a pair of braces 5 between the two pillars 1 and 1. , 5 are assembled in a multi-stage shape while being bridged in an X shape.

  As shown in FIG. 2 (a), the safety handrail T of the present invention attached to the frame scaffold is made of steel pipe left and right vertical frames 11 and 11, upper and lower horizontal frames 12 and 13, a horizontal center frame 14a and a vertical center frame. The handrail body 7 formed by the crosspieces 14b and 14b and disposed between the opposing pillars 1 and 1 of the two building frames 4 and 4, and the handrail main body 7 is connected to the opposite pillars 1 and 2 of the two building frames 4 and 4. 1 and the horizontal middle rail 14a is located at a required height position on the upper side located above the middle part (central part) of the vertical frame 11.

  The handrail body 7 of the safety handrail T will be described in detail. As can be seen from FIGS. 2 to 4, the left and right vertical frames 11 of the handrail body 7 are required to be located above the mounting position of the horizontal center rail 14a. The plate is divided into two at the height position, and a rectangular plate piece P made of steel plate is inserted between the divided end portions 11a and 11b so that the plate surface faces the inside and outside of the handrail. The part side and the lower end part side are welded and fixed to the upper side divided end part 11a and the lower side divided end part 11b of the vertical frame, respectively, and thereby the hook F of the safety belt A to be worn by the operator is attached to the handrail body 7 The plate piece P is bent between the divided end portions 11a and 11b of the vertical frame 11 when a predetermined impact tensile load in the inner direction of the handrail is applied to the upper horizontal frame 12 while attached to the upper horizontal frame 12. Is. The plate piece P has a width slightly larger than the diameter of the vertical frame 11.

In inserting the plate piece P between the divided end portions 11a and 11b of each vertical frame 11, (a) in FIG.
And, as shown in (b), the upper side divided end portion 11a of the vertical frame 11 has a slit width w slightly larger than the thickness t of the plate piece P and a slit of about ½ of the length l of the plate piece P. A slit 26 having a depth n is formed in the left-right direction of the handrail body 7 along the diameter direction of the vertical frame 11, and a slit having a slit width w and a slit depth n is also formed on the lower divided end portion 11 b of the vertical frame 11. 27 is formed in the left-right direction of the handrail main body 7 along the diameter direction of the vertical frame 11. Then, the upper half of the plate piece P is inserted into the slit 26 of the upper divided end portion 11a, and the lower half of the plate piece P is inserted into the slit 27 of the lower divided end portion 11b. As shown in (a) and (c) of the same figure, with both end portions of the plate piece P protruding from both sides of the slits 26 and 27, as shown in FIGS. And the lower end side is welded to the upper side divided end portion 11a and the lower side divided end portion 11b of the vertical frame respectively (the welded portion is indicated by 29), thereby the upper side divided end portion 11a of each vertical frame 11 and The lower divided end portion 11b is integrally connected. In this case, the entire plate piece P is not welded to the divided end portions 11a and 11b of the vertical frame 11, but as shown in FIGS. 3 (a) and 3 (c). It is preferable to weld the lower end portion to the divided end portions 11a and 11b.

  A diagonal member 15 made of a steel material having a lower bending strength than the frames 11 and 12 is integrally attached to the corner required portions of the vertical frames 11 and the upper horizontal frame 12 of the handrail body 7 by welding. The attachment means B is attached to the lower side of each vertical frame 11 of the handrail main body 7 and is positioned on the horizontal frame 2 of the building frame 4, and the vertical frames 11, 12 of the handrail main body 7. A lower fixing bracket 8 that is attached to the lower end portion of the door frame and fixes the handrail body 7 to the upper side of the pedestal 1 of the building frame 4 and the handrail body 7 is fixed to the lower side of the pedestal 1 of the upper building frame 4. The upper fixing bracket 9 is used.

  As shown in FIG. 2, the length of the center between the upper horizontal frame 12 and the lower horizontal frame 13 of the handrail body 7 is a, and the length of the center between the lower horizontal frame 13 and the horizontal middle rail 14a is b. The distance between the cores of the upper horizontal frame 12 and the horizontal middle crosspiece 14a is c, and the length between the axis of the upper horizontal frame 12 and the mounting position of the upper fixing bracket 9 is d. For example, a is 1184 mm, b is 740 mm, c is 444 mm, and d is 118 mm.

  Further, the vertical frame 11 and the upper and lower horizontal frames 12 and 13 of the handrail main body 7 are each made of a steel pipe having a diameter of 27.2 mm, for example, and the horizontal and horizontal bars 14a and 14b are each made of a steel pipe having a diameter of 20 mm, for example. The diagonal member 15 is made of a round bar-shaped steel material such as a reinforcing bar having a diameter of 8 mm, which has a lower bending strength than the frame members of the vertical frame 11 and the horizontal frames 12 and 13.

  When attaching the diagonal member 15 to the required corners of the vertical frame 11 and the upper horizontal frame 12 of the handrail body 7, the round bar-shaped steel material is cut into a predetermined length and both end surfaces of the round bar-shaped steel material are required. Cut diagonally at an inclination angle to form a slope. In this case, the diagonal member 15 forms a right triangle having an intersection angle of 30 ° with the vertical frame 11 and an intersection angle of 60 ° with the upper horizontal frame 12 at the corner portion of each vertical frame 11 and the upper horizontal frame 12. The lower end side slope is formed into a slope having an inclination angle of 30 ° with respect to the length direction of the diagonal member 15, and the upper end side slope is inclined with an angle of 60 ° with respect to the length direction of the diagonal member 15. It forms on the slope with.

  As described above, a round steel material is used as the diagonal member 15, both end surfaces thereof are formed into inclined surfaces having a required inclination angle, and both inclined surfaces are in contact with the inner surface of the vertical frame 11 and the lower surface of the upper horizontal frame 12, respectively. By doing so, both end portions of the diagonal member 15 can be attached to the vertical frame 11 and the upper horizontal frame 12 of the handrail body 7 very firmly and accurately, and the attachment can be easily and easily performed.

  The action of the diagonal member 15 will be described. As described above, the diagonal parts of the vertical frame 11 and the upper horizontal frame 12 of the handrail main body 7 are provided with diagonal members made of a steel material having a bending strength lower than those of the frames 11 and 12. By attaching the material 15 integrally, as shown in FIG. 6, the hook F of the safety belt A worn by the worker M on his / her body is attached from the diagonal material 15 of the upper horizontal frame 12 of the handrail body 7. While working with the inner side attached, the worker M slipped from the scaffolding plate 6 and the like, and the wife described in FIG. When a predetermined impact tensile load is applied outwardly from the end of the scaffolding plate 6 in the handrail inner direction corresponding to the test load of the side drop test, the hook F extends along the upper horizontal frame 12 of the handrail body 7. It slides to the end side, but is caught on the diagonal 15 during the sliding process, Which is prevented or more slides.

  In this way, when the hook F is caught on the diagonal member 15 in the course of sliding and is prevented from sliding, the impact tensile load acts on the diagonal member 15 and the bending strength is weaker than the vertical frame 11 and the upper horizontal frame 12 of the handrail body 7. As shown in FIG. 7, the diagonal member 15 is deformed into a curved shape, and the deformation of the diagonal member 15 reduces the impact when the hook F is hooked on the diagonal member 15. As a result, the hook F is shown in FIG. Without being broken, and thus without opening the mouth, that is, without detaching the hook main body f1 from the anti-slip device f2, it is held at the position where it is caught by the diagonal member 15 in the normal state as shown in FIG. Can be prevented.

  As shown in FIG. 6, the safety belt A is provided with a lanyard Y having a length of 1.7 m and an attachment ring R that is provided at one end of the lanyard Y and is attached to the trunk belt N of the worker M. And a hook F provided at the tip of the lanyard Y and hooked on the safety handrail T. As shown in FIG. 7, the hook F includes a hook main body f1 and a detachment prevention device f2 with which the hook main body f1 can be freely engaged and disengaged. Moreover, the attachment position of the hook F of the safety belt A is on the inner side of the attachment position of the diagonal member 15 in the upper horizontal frame 12 of the handrail body 7, as shown in FIG.

  As shown in FIGS. 8A to 8D, the positioning hook 10 of the attachment means B of the safety handrail T is placed on the side of the building frame 4 below the tip of the mounting arm 10a attached to the vertical frame 11. The frame 2 has a hook portion 10b that is fitted and latched from above, and the upper end of the mounting arm 10a has the safety handrail T reversed when the safety handrail T2 is attached or removed. A hook portion 10c that is fitted and locked to the four horizontal members 2 is formed.

  The lower fixing bracket 8 and the upper fixing bracket 9 have the same structure, and details thereof are shown in FIGS. FIG. 9 is a front view when the fixtures 8 and 9 are in the fixed position, and FIG. 10 is a plan view. FIG. 11 is a front view when the fixtures 8 and 9 are in the storage position.

  Referring to FIGS. 9 to 11, each of the fixing brackets 8 and 9 includes a mounting member 16 fixed to the vertical frame 11 of the handrail body 7, and a pedestal that is detachably engaged with the pedestal 1 of the building frame 4. An engaging portion 17 is provided at one end, and a fixed position where the pedestal engaging portion 17 engages with the pedestal 1 and the pedestal engaging portion 17 is detached from the pedestal 1 and is attached to the vertical frame 11 of the handrail body 7. A rotating member 18 pivotally attached to the mounting member 16 by a pivot 28 so as to be rotatable between a storage position folded and stored along the lock, and a locking means for locking the rotating member 18 to a fixed position and a storage position. 19. The other end of the rotating member 18, that is, the end opposite to the pedestal engaging portion 17 is engaged with the vertical frame 11 of the handrail body 7 at the fixed position, and the vertical frame 11 of the handrail main body 7 at the storage position. A vertical frame engaging portion 25 is provided to be separated from the vertical frame engaging portion.

  The locking means 19 of each of the fixing brackets 8 and 9 is adapted to elastically contact the engaging projection piece 21 on one side of the sliding contact surface portion of the mounting member 16 and the rotating member 18 with the spring 20 on the other sliding contact surface portion side. And the engaging protrusion 21 is engaged when the rotating member 18 is rotated to the fixed position and the storage position, and the rotating member 18 is fixed to the fixed position and the storage position. The fixed position lock hole 22A and the storage position lock hole 22B are provided respectively.

  By rotating the rotating member 18 by 90 ° from the storage position shown in FIG. 11, the leg column engaging portion 17 of the rotating member 18 engages with the leg column 1 of the building frame 4 and at the same time, the vertical frame engaging portion. 25 is engaged with the vertical frame 11 of the handrail main body 7, and at the same time, the tip hemispherical portion 21 a of the engaging protrusion 21 is engaged with the lock hole 22 </ b> A for the fixed position of the rotating member 18. Is changed from the storage position to the fixed position and simultaneously locked to the fixed position, resulting in a state as shown in FIG.

  If the usage method of the safety handrail T comprised as mentioned above is demonstrated, first, as shown to (a) of FIG. 1, a pair of building frames 4,4 will be opposingly arranged, and both building frames 4,4 will be shown. After the braces 5 and 5 are stretched in an X shape between the opposite pedestals 1 and 1, the safety handrail T1 is attached to both the building frames 4 and 4, and then the horizontal members facing the both building frames 4 and 4. Assemble the scaffolding board 6 between 2 and 2, and assemble the first stage scaffolding. When mounting the safety handrail T1, the upper and lower fixing brackets 8 and 9 of the mounting means B are both set in the storage position where the rotating member 18 is folded along the vertical frame 11 of the handrail body 7 as shown in FIG. Then, in the state locked by the locking means 19, the positioning hooks 10, 10 on both sides of the handrail body 7 are opposed to the both building frames 4, 4 as shown in FIG. 1 (a) and FIG. 2 (a). The position of the handrail main body 7 is determined by hooking on the horizontal members 2 and 2 to be performed.

  When the positioning hooks 10 and 10 are hooked on the opposing horizontal members 2 and 2 of the building frames 4 and 4 and positioned as described above, the rotating member 18 of each lower fixing bracket 8 is turned to the fixed position. The pedestal engaging portion 17 at one end of the rotating member 18 is engaged with the pedestal 1 of the building frame 4 and the vertical frame engaging portion 25 at the other end is engaged with the vertical frame of the handrail main body 7 by moving. 11 and at the same time, the locking member 19 locks the rotating member 18 in a fixed position, thereby fixing each lower fixing bracket 8 to the pedestal 1 of the first-stage scaffolding building frame 4.

  Next, ascending to the scaffold 1 of the first-stage scaffolding as shown in FIG. 1 (a), the second-stage building frames 4 and 4 are respectively added to the first-stage building frames 4 and 4, and The upper fixing brackets 9 and 9 of the safety handrail T that have not been fixed yet are fixed to the pedestals 1 of the second-stage building frames 4 and 4 in the same manner as the lower fixing bracket 8 described above. The braces 5 and 5 are stretched in an X shape between the opposite pillars 1 and 1 of the step-side building frames 4 and 4 so as to be in a state as shown in FIG.

  The assembly work of the second stage scaffold is carried out on the scaffold board 6 of the first stage scaffold, and the second stage scaffold is provided on the upper side of the pillar 1 of the building frame 4 by the lower fixing bracket 8. Since the upper half or more of the safety handrail T protrudes upward from the scaffolding plate 6, the work can be performed safely. Further, the handrail body 7 of the safety handrail T is securely fixed between the building frames 4 and 4 of the first stage scaffolding and the building frames 4 and 4 of the second stage scaffolding by the upper and lower fixing brackets 8 and 9. Will be.

  In the second stage scaffolding, the scaffolding plate 6 is laid over the opposite horizontal members 2 and 2 of the two building frames 4 and 4, and then the safety handrail T1 is placed on the two building frames 4 and 4 as described above. Attach in the same way as the eyes. Thereafter, the scaffolding is assembled in a multistage manner while the safety handrail T1 is installed by the same method as described above. In this embodiment, since the display of the drawing is complicated, a minimum scaffold in which the scaffolding plate 6 is bridged between the pair of building frames 4 and 4 on both sides is illustrated, and only the front side of the scaffold is safe. Although the state in which the handrail T1 is installed is shown, actually, the scaffold is continuously connected in a continuous span in the horizontal direction, and the safety handrail T is installed on both the front side and the back side of each scaffold. .

  As shown in FIG. 6, when working on the frame scaffolding in which the safety handrail T is attached to the scaffolding frame 4 as described above, the worker M attaches one end of the safety belt A to his / her trunk belt. At the same time as attaching to N, the hook F of the safety belt A is attached to the upper horizontal frame 12 of the handrail body 7 to perform the work.

  When the worker M is working in a state where the hook F of the safety belt A attached to his / her body is attached to the inner side of the diagonal member 15 of the upper horizontal frame 12 of the handrail body 7, M falls into a fallen state by, for example, sliding the foot from the scaffolding plate 6, and the hook F of the safety belt A has a predetermined direction from the end of the handrail wife side to the outside in the handrail inner direction corresponding to the test load of the wife side drop test. When the impact tensile load is applied, the hook F slides along the upper horizontal frame 12 toward the end thereof, but is caught on the diagonal member 15 in the course of the sliding and is prevented from further sliding, so that the impact tensile load is reduced. It acts on the diagonal 15 and deforms the diagonal 15. Due to the deformation of the diagonal member 15, the impact when the hook F is caught on the diagonal member 15 is mitigated, so that the hook F opens the mouth without breaking the hook main body f1 and detaching from the locking device f2. Without being held by the diagonal member 15, the operator M can be prevented from falling.

  In addition, the safety handrail T is divided into two left and right vertical frames 11 of the handrail main body 7 at the required height position on the upper side located above the mounting position of the horizontal center rail 14a, and between the divided end portions 11a and 11b. The plate P made of steel plate is inserted so that the plate surface faces the inside / outside direction of the handrail, and the upper end side and the lower end side of the plate piece P are divided into the upper side split end 11a and the lower side split of the vertical frame. Since this safety handrail T is used to perform the fall prevention performance test as shown in FIG. 12, that is, a lanyard having a length of 1.7 m, since it has a structure that is welded and fixed to the end portions 11b. The hook F of the safety belt A with a weight W of 100 kg attached to the tip end portion of Y is attached to the upper horizontal frame 12 of the handrail body 7 shown in FIG. When an impact tensile load is applied, the vertical frame 11 of the handrail body 7 is As shown in the phantom lines in FIGS. 3A and 3B, and further referring to FIG. 3, the plate connecting the upper side divided end 11a and the lower side divided end 11b of the vertical frame 11 is connected. Bending stress concentrates on the central portion of the piece P, and the vertical frame 11 is bent downward from the central portion of the plate piece P toward the inside of the handrail as shown by the phantom line in FIG.

  At this time, the hook F of the safety belt A slides on the upper horizontal frame 12 of the handrail body 7 and is hooked on the diagonal member 15 at the end of the upper horizontal frame 12 as shown in FIG. As described above, since it bends downward from the center portion of the plate piece P inserted between the upper side divided end portion 11a and the lower side divided end portion 11b inward of the handrail, as can be seen with reference to FIG. The weight W at the tip of the lanyard Y having a length of 1.7 m does not fall from the scaffold plate 6 having a height of 3.425 m to the ground, and is suspended. Therefore, it is possible to avoid the worker falling on the ground.

  In the safety handrail T of this embodiment, since the diagonal member 15 is integrally attached to the corner side required portions of the vertical frames 11 and the upper horizontal frame 12 of the handrail main body 7, the diagonal member 15 is not attached. In this case, the hook F of the safety belt A slides on the upper horizontal frame 12 of the handrail body 7 and is hooked on the upper fixing bracket 9 at the upper end of the vertical frame 11, but the height position at which the hook F is hooked is This is almost the same as when the diagonal member 15 is attached.

(a) And (b) is a description perspective view explaining the attachment method of the safety handrail which concerns on this invention. (a) is a front view of the safety handrail T, (b) is a side view, and (c) is a plan view. (a) is an enlarged front view of the portion indicated by arrow A in FIG. 2, (b) is a sectional view of the knee line of (a), (c) is a side view of the portion indicated by (a) in FIG. (C) is a sectional view taken along the ho-ho line. It is explanatory front view which shows the state which inserts a plate piece between the upper side division | segmentation edge part and lower part side division | segmentation edge part of the vertical frame of a handrail main body. (a) is an enlarged front view showing a state in which a plate piece is inserted between the upper divided end and the lower divided end of the vertical frame of the handrail body, and (b) is an enlarged side view showing the same state. is there. It is a front view which shows the state which attached the safety belt to the safety handrail. It is explanatory drawing explaining the effect | action of the diagonal material attached to the handrail main body. (a) and (b) are enlarged views of portions indicated by (b) and (c) in FIG. 2 (c), and (c) and (d) are plan views of (a) and (b), respectively. It is an enlarged front view of the upper and lower fixing brackets in the fixing position. It is an enlarged plan view of the upper and lower fixing brackets in the fixing position. It is an enlarged front view of the upper and lower fixing brackets in the storage position. (a) is a front view showing test equipment for a safety handrail fall prevention performance test, and (b) is a plan view. (a) is a front view showing a conventional safety handrail, and (b) is a side view.

Explanation of symbols

T safety handrail A safety belt F safety belt hook 1 pedestal 2 horizontal frame 4 scaffolding frame 6 scaffolding plate 7 handrail body B mounting means 8 lower fixing bracket 9 upper fixing bracket 10 positioning hook 11 vertical direction of the handrail body Frame 11a Upper side divided end 11b of vertical frame Lower side divided end P of vertical frame Plate piece 12 Upper horizontal frame 13 of handrail body Lower horizontal frame 14a of handrail body Horizontal middle beam 14b Vertical middle beam 15 Diagonal material

Claims (2)

Safety that attaches to a frame scaffold that is assembled in a multi-stage manner with a scaffolding plate that spans between the horizontal members of both building frames with the building frame consisting of a pair of pedestals on both sides and a horizontal frame that connects the upper ends of both columnars facing each other A handrail body, which is formed by steel pipe left and right vertical frames, upper and lower horizontal frames, and vertical and horizontal center rails, and is disposed between the opposite pedestals of both building frames, In a safety handrail comprising attachment means that is detachably attached to the opposite pedestal,
The left and right vertical frames of the handrail main body are divided into two at the required height position on the upper side above the horizontal center rail mounting position. By inserting the plate pieces so as to face each other and welding and fixing them to the upper divided end and the lower divided end, the hook of the safety band to be worn by the operator is attached to the upper horizontal frame of the handrail body. A safety handrail characterized in that when a predetermined impact tensile load in the inner direction of the handrail is applied to the upper horizontal frame side in the attached state, the plate piece is bent between the divided end portions of the vertical frame. At the corner side required part of each vertical frame and upper horizontal frame of the handrail body, a hook of a safety belt to be worn by the operator is attached to the upper horizontal frame of the handrail body with a predetermined direction in the direction inside the handrail. In order to hold the hook so that it is not damaged when an impact tensile load is applied, a diagonal member made of a steel material whose bending strength is weaker than that of the vertical frame and upper horizontal frame of the handrail body is integrally attached. Item 2. The safety handrail according to Item 1.

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