JP4053035B2 - 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 pillars 1 and a column-shaped building frame 4 composed of a reinforcing frame 3 and a horizontal frame 2 connecting the upper ends of both leg pillars 1, 1. A handrail that is attached to a frame scaffolding that is assembled in a multistage manner with the scaffolding plate 6 being bridged between the horizontal members 2 and 2, and includes left and right vertical frames 11, 11, upper and lower horizontal frames 12 and 13, and vertical and horizontal inner frames 14 a and 14 b. The handrail main body 7 formed between the two building frames 4, 4 and disposed between the opposed pedestals 1, 1, and the handrail main body 7 can be freely attached to and detached from the opposed pedestal columns 1, 1 of both the building frames 4, 4. And mounting means B to be attached to. Further, the attachment means B is provided at an intermediate portion of each vertical frame 11 of the handrail body 7, and a positioning hook 10 that is hooked on the horizontal member 2 of the building frame 4 and a lower end portion of each vertical frame 11. Provided, a lower fixing bracket 8 for fixing the handrail main body 7 to the upper side of the pedestal 1 of the building frame 4 and an upper end portion of each vertical frame 11, and the handrail main body 7 is connected to the pedestal 1 of the upper stage building frame 4. And an upper fixing metal fitting 9 to be fixed to.

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. 9 is a drop test to the side of the scaffolding plate. As can be seen from FIGS. 9 (a) and 9 (b), a safety handrail is attached to the test jig Z (framework scaffold). Attach T, hook the hook F of the lanyard Y of the safety belt A to a predetermined position (at 20 cm from the end) of the upper horizontal frame 12 of the safety handrail T, and attach a 100 kg weight attached to the tip of the lanyard Y W is intended to drop from a predetermined height position (height position of 90 cm from the scaffolding board 6) 30 cm away from the safety handrail T and 30 cm away from the end of the wives side of the scaffolding board 6, If the fall of the weight W can be prevented, the safety handrail T is safe in strength and can be used. In addition, the height of the scaffold board 6 from the ground is 3.425 m.
JP 2003-343079 A

  However, in the conventional safety handrail as described in Patent Document 1, the handrail body 7 itself has sufficient strength to withstand the drop prevention performance test as described above, and when the weight W is dropped. As shown in FIG. 10 (b), the hook F of the safety belt A is broken and the mouth is opened due to the impact tensile load, which causes a problem that the weight W falls. The cause of the opening of the hook F in this way is that, in the drop test, the hook F of the safety belt A starts from the predetermined position on the end side of the upper horizontal frame 12 as indicated by the arrow in FIG. The hook F is squeezed and hooked on the upper fixing bracket 9, where the hook F is twisted because an impact tensile load is applied to the hook F in the direction of the inside of the safety handrail T and outward from the end of the scaffolding plate 6. It turned out that it was twisted sideways, which opened the mouth of the hook F, which was dangerous.

  In view of the above-described problems, the present invention does not cause the hook of the safety belt to be particularly sturdy, and the hook breaks even if a predetermined impact tensile load is applied in the wife side drop test as described above. Therefore, an object of the present invention is to provide a safety handrail that can prevent a weight from falling and reliably prevent an operator from falling.

  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 both side pillars 1 and the upper ends of both leg pillars 1 and 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 both building frames 4 and 4 with the building frame 4 made of the frame material 2 facing each other, A handrail body 7 formed between left and right vertical frames 11, 11, upper and lower horizontal frames 12, 13 and middle rails 14 a, 14 b made of steel pipes, and disposed between opposed pillars 1, 1 of both building frames 4, 4; In the safety handrail comprising the attachment 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 vertical frame 11 and the upper horizontal frame 12 of the handrail main body 7 The hook F of the safety belt A to be worn by the worker M is attached to the corner side required portion 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 is applied to the hook F in the inner direction of the handrail in the direction of the inner side of the handrail in the state of being attached to the horizontal frame 12, An oblique member 15 made of a steel material having a lower bending strength than the vertical frame 11 and the upper horizontal frame 12 is integrally attached.

  Claim 2 is the safety handrail according to claim 1, wherein the diagonal member 15 is made of a round steel material, and both end surfaces 15 a and 15 b are formed on inclined surfaces having a required inclination angle. 15b is characterized in that it is in contact with and welded to the inner surface of the vertical frame 11 and the lower surface of the upper horizontal frame 12, respectively.

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, the corners of the vertical frames 11 and the upper horizontal frames 12 of the handrail body 7 are required. Since the diagonal member 15 made of a steel material whose bending strength is weaker than those of the frames 11 and 12 is integrally attached to the part, the hook F of the safety belt A worn by the worker M is attached to the handrail main body. When the operator M is working with the upper horizontal frame 12 attached to the inner side of the diagonal member 15, the worker M is in a fallen state by sliding his / her foot from the scaffold plate 6, etc. When a predetermined impact tensile load is applied to the hook F of A in the handrail inner side direction corresponding to the test load of the wife side drop test, the hook F moves along the upper horizontal frame 12 along the upper horizontal frame 12. Although it slides to the end side, it is caught on the diagonal 15 in the course of sliding, and Is prevented more slides, therefore by the tensile impact load is applied to the diagonal member 15 deforms the diagonal members 15 weak bending strength than the frame 11. 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.

  According to the invention of claim 2, a round steel material is used as the diagonal member 15, both end surfaces 15 a and 15 b are formed on inclined surfaces having a required inclination angle, and both inclined surfaces 15 a and 15 b are formed on the inner surface of the vertical frame 11. And by abutting and welding to the lower side of the upper horizontal frame 12 respectively, both ends of the diagonal member 15 can be attached extremely firmly and accurately to the vertical frame 11 and the upper horizontal frame 12 of the handrail body 7, Moreover, the installation becomes easy and easy.

  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 front view of a diagonal member 15 to be described later attached to the handrail body 7, and (c) is a side view thereof. 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 is a steel member having a bending strength lower than those of the frames 11 and 12 at a corner required portion of each vertical frame 11 and the upper horizontal frame 12 of the handrail body 7. The diagonal 15 which consists of is attached integrally by welding. The attachment means B is attached to an intermediate portion of each vertical frame 11 of the handrail main body 7, and a positioning hook 10 that is hooked on the horizontal member 2 of the building frame 4, and each vertical frame 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.

  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, for example, 27.2 mm, whereas the diagonal member 15 includes the vertical frame 11 and the horizontal frames 12 and 13. It is made of a round bar-shaped steel material such as a rebar with a diameter of 8 mm, which has a lower bending strength than the material.

  In attaching the diagonal member 15 made of the round bar-shaped steel material as described above to the corner required portion of each 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, Both end surfaces of the round bar-shaped steel material are obliquely cut at a required inclination angle to form the inclined surfaces 15a and 15b. 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 slope 15a is formed into a slope having an inclination angle of 30 ° with respect to the length direction of the diagonal 15 and the upper slope 15b is 60 ° with respect to the length of the diagonal 15. It is formed on a slope with an inclination angle.

  Thus, at the corners of each vertical frame 11 and the upper horizontal frame 12, the inner side of the upper horizontal frame 12 extends in the length direction from the extreme end position of the upper horizontal frame 12 (on the extension line of the vertical frame 11). The upper slope 15b of the diagonal member 15 is brought into contact with the lower side surface at a position separated by about 20 mm toward the side, and the lower slope 15a of the diagonal member 15 is brought into contact with the inner side surface of the vertical frame 11. The upper and lower ends of the material 15 are welded to the vertical frame 11 and the upper horizontal frame 12 and are integrally attached in a state as shown in FIG.

  In this way, a round steel material is used as the diagonal member 15, and both end surfaces 15 a and 15 b are formed on inclined surfaces having a required inclination angle, and both the inclined surfaces 15 a and 15 b are formed below the inner side surface of the vertical frame 11 and the upper horizontal frame 12. By welding in contact with the side surfaces, both ends 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 mounting can be made easily and easily. Become.

  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 steel material having a lower bending strength than the frames 11 and 12. By attaching the material 15 integrally, as shown in FIG. 3, 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, It 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. The diagonal member 15 is deformed into a curved shape as shown in FIG. 4, and the deformation of the diagonal member 15 reduces the impact when the hook F is hooked on the diagonal member 15, thereby causing the hook F to be deformed as 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. 3, the safety belt A is provided at a lanyard Y, one end of the lanyard Y, an attachment ring R for attaching to the body belt N of the worker M, and the tip of the lanyard Y. And a hook F hooked on the safety handrail T. The hook F includes a hook main body f1 and a detachment prevention device f2 that allows the hook main body f1 to 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. 5A to 5D, the hook 10 of the attachment means B of the safety handrail T is placed on the lower side of the tip of the attachment arm 10a attached to the vertical frame 11, and the horizontal member of the building frame 4 is attached. 2 has a hook portion 10b that is fitted and latched from above, and on the upper end of the mounting arm 10a, when the safety handrail T2 is attached or removed, the safety handrail T is reversed and the building frame 4 is reversed. A hook portion 10c that is fitted and locked to the horizontal member 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. 6 is a front view when the fixtures 8 and 9 are in the fixed position, and FIG. 7 is a plan view. FIG. 8 is a front view when the fixtures 8 and 9 are in the storage position.

  Referring to FIGS. 6 to 8, each of the fixing brackets 8 and 9 includes a mounting member 16 fixed to the vertical frame 11 of the handrail main 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. 8, 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. 3, when working on the frame scaffolding in which the safety handrail T is attached to the scaffold building 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.

(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 front view of a diagonal member to be described later attached to the handrail body, and (c) is a side view thereof. 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 the parts indicated by a and b in FIG. 2 (a), 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 perspective view showing a frame scaffold with a conventional safety handrail attached, (b) is an explanatory view showing a dangerous state in which the hook of the safety belt hooked on the handrail body is broken and the mouth is opened. is there.

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 12 Upper horizontal frame 13 of handrail main body Lower horizontal frame 14a of handrail main body Horizontal crosspiece 14b Vertical central crosspiece 15 Diagonal material

Claims (2)

Safety that attaches to a frame scaffolding 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, which is formed by steel pipe left and right vertical frames, upper and lower horizontal frames, and a middle rail, respectively, and is disposed between the opposite pillars of both building frames, and the handrail main body is opposed to both building frames. In a safety handrail comprising attachment means that is detachably attached to the pedestal,
At the corner side required part of each vertical frame and upper horizontal frame of the handrail body, a safety band hook attached to the operator is attached to the upper horizontal frame of the handrail body, and the scaffolding wife In order to hold the hook so that it does not break when a predetermined impact tensile load is applied from the side end to the outside, an oblique material made of steel material with lower bending strength than the vertical frame and upper horizontal frame of the handrail body is integrated. A safety handrail characterized by being attached to. The diagonal member is made of a round steel material, and both end surfaces thereof are respectively formed into inclined surfaces having a required inclination angle, and both inclined surfaces are in contact with and welded to the inner side surface of the vertical frame and the lower side surface of the upper horizontal frame, respectively. The safety handrail according to claim 1, wherein the safety handrail is provided.

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