JP4052466B2 - Reinforced handrail frame - Google Patents

Description

  The present invention relates to a reinforced leading handrail frame for fall prevention that is attached to a frame scaffold used in a construction site or the like.

  A framework scaffold is generally a standing frame after standing a plurality of torii-shaped building frames at right angles to the building, crossing the crossing diagonally on the building side to make it stand alone, and attaching a handrail on the road side A scaffolding plate is laid and fixed on the upper side (horizontal heel) of the base plate to form one unit of scaffolding, which is formed by repeating this multiple times. A handrail frame is attached to each stage of the scaffold in order to protect the safety of workers who work on the scaffold.

  When assembling this frame scaffold from the bottom, if the handrail frame is attached after the worker gets on the uppermost scaffold, there is a risk that the worker falls. In order to prevent the operator from falling, the operator can remove the handrail frame for the uppermost scaffold from the position of the scaffold one below the uppermost scaffold (the handrail frame is already attached to this scaffold). The preceding handrail frame has made it possible to protect the safety of the worker by going through the order in which the worker gets on the uppermost scaffold after being attached in advance.

  After the preceding handrail frame is attached to the uppermost scaffolding, when forming a frame scaffolding that is one step higher, the operator must attach a preceding handrail frame for the scaffolding that is one step higher, You will get on the top scaffolding formed in

  As described above, the preceding handrail frame is used when the frame scaffolding is sequentially assembled from the bottom, but after the frame scaffolding is assembled, it functions as a normal handrail frame.

  In addition, when removing the frame scaffold from the top in reverse, the operator can remove the handrail frame for the top scaffold from the position of the scaffold one below the top scaffold. Can keep people safe.

  Here, an example of a preceding handrail frame is shown in FIG. FIG. 8 is a front view showing an example of a preceding scaffold frame. The preceding scaffold frame 1 has a frame-shaped periphery composed of two left and right building materials 2, 2 and an upper horizontal material 3 and a lower horizontal material 4, and a pair of first reinforcements connecting the building material and the lower horizontal material. A second reinforcing member 6 that connects the members 5 and 5 and the pair of first reinforcing members 5 and 5 is provided in the frame. The building material is provided with an upper fixture 7, a positioning fixture 8, and a lower fixture 9 in order from the top outside the frame.

  FIG. 9 is a schematic diagram showing an operation of attaching the preceding handrail frame. The scaffold 51 for the current scaffold on which the worker 20 stands is the upper side of the lower scaffolding frame 43 after the worker attaches a plurality of preceding handrail frames 52 from the lower scaffold plate (not shown). The scaffolding plate 51 is formed on the horizontal rod). After the scaffold board 51 is formed, the worker rides on the scaffold board 51 and vertically connects the building frame 53 for the current scaffold onto the building frame 43 for the lower scaffold. After the installation, a brace (not shown) is obliquely attached to the building side between the building frames 53 and the building frame 53 is fixed. Before the worker gets on the scaffolding plate 51, the building frame 53 is fixed. It can be seen that a handrail frame is already installed in the current scaffold. The upper fixing bracket 7 of the preceding handrail frame 52 for the current scaffold is fixed to the fixed building frame 53.

  The worker 20 in this figure stands on the scaffolding plate 51 for the current scaffold, lifts the preceding handrail frame 62 for the upper scaffold, places the positioning bracket 8 at a predetermined position of the building frame, and places the positioning bracket 8 The leading handrail frame 62 is rotated about the fulcrum, and the lower fixing bracket 9 of the leading handrail frame 62 is fitted to the building frame 53 for the current scaffold. Thus, the leading handrail frame 62 for the upper scaffold is fixed to the building frame 53 for the current scaffold.

  On the other hand, when removing the frame scaffold from the top, the worker standing on the lower scaffold simply removes the lower fixing bracket from the building frame and then reverses the handrail frame with the positioning bracket as a fulcrum. Easy to remove.

  In Patent Document 1, as an example of the preceding handrail frame, a device in which the fixing bracket is devised to prevent the handrail frame from rolling is described.

JP-A-8-184177

  After the preceding handrail frame as described above is installed for the uppermost scaffold, the operator can get on the uppermost scaffold. Therefore, since the worker no longer gets on the uppermost scaffold without the handrail installed, there is no danger of the operator falling due to the absence of the handrail.

  However, even if a handrail frame is installed, since it is a work at a high place, the worker wears a safety belt for preventing the fall and works or moves. A leading handrail frame is used as a base for the safety belt.

  FIG. 10 is a schematic diagram showing movement of an operator at a high place. Here, the worker 20 moves after attaching one end of the safety belt 70 to the waist and attaching the other end to a handrail or the like of the framework scaffold. As described above, the upper horizontal material 3 of the preceding handrail frame is used as a source of the safety belt for preventing the operator from falling.

  However, when the worker works or moves on the scaffold, the worker may stagger and the weight of the worker may be suddenly applied to the preceding handrail frame. Also, when the operator attaches or removes the handrail frame for the uppermost scaffold from the position of the scaffold one below the uppermost scaffold, the worker may fluctuate. Thus, the weight of the operator may be suddenly applied to the preceding handrail frame to which the operator is already attached.

  As described above, when a large load is suddenly applied to the preceding handrail frame, the preceding handrail frame may be broken and the operator may fall from the broken portion.

  Therefore, there is a demand for a handrail frame that does not break even when a large load is suddenly applied to the handrail frame so that the operator does not fall.

  As a result of various studies on means for obtaining a leading handrail frame having a high breaking strength, the present inventor has obtained the following knowledge.

  (1) The breaking strength required for the preceding handrail frame is instantaneously 3000 N, assuming that a sufficient load is applied to the preceding handrail frame as a safety belt suspension for preventing the operator from falling. Even if a load is applied to the preceding handrail frame, it is necessary to have a strength that does not break.

  (2) To increase the strength of the leading handrail frame so that it does not break even when a load of 3000 N is suddenly applied to the leading handrail frame, it is possible to increase the cross-sectional shape of the leading handrail frame or increase the material of the leading handrail frame. However, in both cases, the weight of the leading handrail frame itself is increased.

  As the material of the leading handrail frame, the weight has been conventionally reduced by using an aluminum tube, a high-tensile steel tube, or the like, but the weight of one leading handrail frame is still about 8 kg, and this can be reduced by the operator. Therefore, if the weight of the preceding handrail frame is further increased, the attachment work becomes unstable, and not only the workability but also the safety is lowered. From this point of view, the weight of the leading handrail frame itself is not allowed to increase.

  (3) When the material of the leading handrail frame itself is changed, all the existing leading handrail frames are discarded and a new leading handrail frame is recreated, which entails enormous costs.

  Under such circumstances, the present inventor does not need to increase the breaking strength of the preceding handrail frame itself, and the frame shape of the preceding handrail frame is maintained even if a crack occurs in the member of the preceding handrail frame itself. For example, the leading handrail frame did not break and the worker would not fall down.

  Then, as a means for maintaining the frame shape of the preceding handrail frame even when a crack occurs in the member of the preceding handrail frame, the idea is to pass a reinforcement line inside the member of the preceding handrail frame. As a result, even if a load of 3000 N is instantaneously applied to the preceding handrail frame and a crack occurs in the member of the preceding handrail frame, the frame shape is maintained by the reinforcing wire, so that the worker does not fall down. I understood.

  In addition, this method does not increase the weight of the leading handrail frame, and can be manufactured by modifying the existing leading handrail frame, and has the advantage that the existing leading handrail frame can be reused. Yes.

  Furthermore, according to this method, the frame shape is maintained by the reinforcing wire even if cracks occur in the members of the preceding handrail frame, so it is possible to use materials other than aluminum tubes and high-tensile steel tubes as materials for the preceding handrail frame. It becomes. For example, it is possible to manufacture the handrail frame using a low-priced and easy-to-process polymer material pipe such as a polyethylene pipe, a polypropylene pipe, or a polyvinyl chloride pipe.

  The present invention has been completed based on such knowledge and idea, and is a leading handrail frame having a frame formed from a building material and a horizontal material and a reinforcing material provided in the frame, and at least an upper part. It is characterized in that a reinforcing wire is passed through the inside of the horizontal material.

  In addition to the inside of the upper horizontal material, the reinforcing wire may be passed through a part or the whole of the building material, and further, the reinforcing wire may be passed through the lower horizontal material. The reinforcing wire may be passed through the inside of the reinforcing material.

  The material of the reinforcing wire is not particularly limited, but it is preferable to use a stainless steel wire or a stranded wire of stainless steel wire, or a polyamide resin fiber or a stranded wire of polyamide resin fiber.

  According to the present invention, it is possible to obtain a leading handrail frame that does not break even when a large load is suddenly applied. At this time, it can be obtained without increasing the weight of the preceding handrail frame and by modifying the existing preceding handrail frame.

  Furthermore, it is possible to manufacture a leading handrail frame using an inexpensive and easy-to-process polymer material tube such as a polyethylene tube as a material for the leading handrail frame.

  In the preceding handrail frame according to the present invention, the portions through which the reinforcing wire is passed through the members forming the frame are (1) the inside of the upper horizontal material, (2) the inside of the building material, and (3) the lower horizontal material. There are three inside. The leading handrail frame is easily deformed in the order of the upper horizontal material, the building material, and the lower horizontal material. Therefore, it is necessary to pass the reinforcing wire through the upper horizontal material. And it is preferable to let a reinforcement wire pass also into the inside of building material. Moreover, the crack generation | occurrence | production location of a preceding handrail frame is the order of the center part of an upper horizontal material, and then the intersection part of a building material and a reinforcing material. Therefore, when the reinforcing wire is passed through the interior of the building material, the reinforcing wire may be passed through the entire length of the building material, or only the intersection of the building material and the reinforcing material may be covered. In addition, about a lower horizontal ground material, since there is little deformation amount and the frequency of a crack generation is low, although the necessity of letting a reinforcement wire pass is small, you may let it pass also to the inside.

  In order to pass the reinforcing wire through the members of the preceding handrail frame, it is necessary to fix both ends of the reinforcing wire, and for that purpose, a fixing material such as a clip is required. When passing, no fixing material is required. At this time, the reinforcing wire in the lower part may pass through the lower horizontal material, or may pass through the lower horizontal material.

  Note that a reinforcing wire may be passed through the reinforcing material provided in the frame of the preceding handrail frame.

  The reinforcing wire may be any material that does not break when a load of 3000 N is instantaneously applied, but a metal material and a polymer material are preferable. A stainless steel wire (for example, SUS304) is preferable from the viewpoint of corrosion resistance and high tension, and a fiber made of a polyamide resin (for example, nylon 6) is preferable from the viewpoint of lightness. These reinforcing wires are particularly preferably used in the form of a stranded wire.

  And when twisting a reinforcement wire and using it as a twisted wire, as an outer diameter of a twisted wire, a 3.5-6 mm thing can be used. In particular, about 5 mm is preferable.

  1 to 4 show several examples of the leading handrail frame according to the present invention.

  FIG. 1 is a front view showing an example of a preceding handrail frame 1 in which only the upper horizontal material is reinforced. A frame-shaped periphery is constituted by two left and right building materials 2, 2 and an upper horizontal material 3 and a lower horizontal material 4, and a pair of first reinforcing members 5, 5 and a pair connecting the building material and the lower horizontal material Among the preceding scaffold frame 1 in which the second reinforcement member 6 connecting the first reinforcement members 5 and 5 is provided in the frame, the reinforcement wire 12 is passed through the inside of the upper horizontal ground member 3. Both ends of the reinforcing wire 12 are fixed by clips 10 and 10.

  FIG. 2 is a front view showing an example of the preceding handrail frame 1 in which the upper horizontal material and the building material are reinforced. Reinforcing wires 12 are passed through the upper horizontal material 3 and the building materials 2 and 2. Both ends of the reinforcing wire 12 are fixed by clips 10 and 10.

  FIG. 3 is also a front view showing an example of the preceding handrail frame 1 in which the upper horizontal material and the building material are reinforced. However, the reinforcing wire 12 passes through the interior of the upper horizontal material 3, but the interior of the left and right building materials 2, 2 only passes through a part of the upper part. This is because the breakage in the building material is likely to occur at the intersection 11 between the building material 2 and the first reinforcing material 5, so that at least the location of the intersection 11 is covered when reinforcing the building material. This is because there are cases where it is almost sufficient. Both ends of the reinforcing wire 12 are fixed by clips 10 and 10.

  FIG. 4 is also a front view showing an example of the preceding handrail frame 1 in which the upper horizontal material and the building material are reinforced. However, since the reinforcing wire 12 passes not only inside the upper horizontal material 3 and the left and right building materials 2 and 2 but also outside the lower horizontal material, and passes through the entire circumference of the frame of the preceding handrail frame. Clips that fix both ends of the wire are not required.

  FIG. 5 is a front view showing an example of the preceding handrail frame 1 in which the upper horizontal material, the building material, and the lower horizontal material are reinforced. In addition to the inside of the upper horizontal material 3 and the left and right building materials 2 and 2, the reinforcing wire 12 further passes through the inside of the lower horizontal material. Since the entire circumference of the preceding handrail frame is passed, there is no need for a clip for fixing both ends of the reinforcing wire.

  A drop test was performed using a leading handrail frame reinforced through a reinforcing wire inside the upper horizontal material and the building material shown in FIG.

  The drop test was performed by applying a falling body having a height of 90 cm to a weight of 100 kg to the preceding handrail frame. At this time, a load of 3000 N was applied to the leading handrail frame.

  As a result, as shown in FIG. 6, cracks 13 were observed in the upper horizontal material 3 and the building material 2, but the reinforcing wire 12 was not cut, so that the frame shape of the preceding handrail frame 1 was maintained. The leading handrail frame itself did not break. And the fallen body did not fall out from this crack part, and escaped the fall.

  For comparison, the same drop test was performed on the leading handrail frame 1 through which the reinforcing wire shown in FIG. 8 did not pass. As shown in FIG. 7, as shown in FIG. Cracks occurred at two locations in the center of the horizontal material 3, and the fallen body fell out of the crack and fell down.

  According to the present invention, it is possible to obtain a leading handrail frame that does not break even when a large load is suddenly applied. At this time, it can be obtained without increasing the weight of the preceding handrail frame and by modifying the existing preceding handrail frame.

  Furthermore, it is possible to manufacture a leading handrail frame using an inexpensive and easy-to-process polymer material tube such as a polyethylene tube as a material for the leading handrail frame.

It is a front view which shows an example of the preceding handrail frame in which only the upper horizontal ground material was reinforced. It is a front view which shows an example of the preceding handrail frame in which the upper horizontal material and the building material were reinforced. It is a front view which shows the other example of the preceding handrail frame in which the upper horizontal material and the building material were reinforced. It is a front view which shows the further another example of the preceding handrail frame in which the upper horizontal material and the building material were reinforced. It is a front view which shows an example of the preceding handrail frame which the upper horizontal material, the building material, and the lower horizontal material were reinforced. It is a front view which shows the condition after the drop test of the preceding handrail frame shown in FIG. It is a front view which shows the condition after the drop test of the preceding handrail frame which the reinforcement line has not passed. It is a front view which shows an example of the preceding handrail frame which the reinforcement line does not pass. It is a schematic diagram which shows the operation | work which attaches a preceding handrail frame. It is a schematic diagram which shows the movement of the operator in a high place.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leading handrail frame 2 Building material 3 Upper horizontal material 4 Lower horizontal material 5 First reinforcing material 6 Second reinforcing material 7 Upper fixing bracket 8 Positioning bracket 9 Lower fixing bracket 10 Clip 11 Intersection of building material and first reinforcing material DESCRIPTION OF SYMBOLS 12 Reinforcement line 13 Crack 20 Worker 43 Building frame for lower scaffolding 51 Scaffold plate 52 Leading handrail frame for current scaffolding 53 Building frame for current scaffolding 62 Handrailing frame for upper scaffolding 70 Safety belt

Claims (5)

  A preceding handrail frame having a frame formed from a building material and a horizontal material and a reinforcing material provided in the frame, wherein a reinforcing wire is passed through at least the upper horizontal material. .   A leading handrail frame having a frame formed from a building material and a horizontal material and a reinforcing material provided in the frame, wherein a reinforcing wire is passed through at least the building material and the upper horizontal material. The leading handrail frame.   It is a preceding handrail frame having a frame formed from building material and horizontal material and a reinforcing material provided in the frame, and at least a reinforcing wire passes through the building material and the upper and lower horizontal materials. A featured handrail frame.   The advance handrail frame according to any one of claims 1 to 3, wherein the reinforcing wire is a stainless steel wire or a stranded wire of a stainless steel wire.   The preceding handrail frame according to any one of claims 1 to 3, wherein the reinforcing wire is polyamide resin fiber or a twisted wire of polyamide resin fiber.

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