JP2020007862A - Lower crosspiece for framework scaffold and its end coupling metal fitting - Google Patents

Abstract

To provide a lower crosspiece for a framework scaffold and an end coupling metal fitting capable of folding a crossing diagonal brace compactly even arranged at the crossing diagonal brace arranged between building frames with a narrow installation interval and also allowing a retrofit to the existing crossing diagonal brace.SOLUTION: A lower crosspiece for a framework scaffold 4 consists of a lower crosspiece body 5 suspended horizontally near downward of a crossing diagonal brace 2 and an end coupling metal fitting 6 mounted to both ends of the lower crosspiece body 5 respectively and coupled to the diagonal brace 2a, 2a. The end coupling metal fitting 6 consists of a sliding metal fitting 7 and a linkage metal fitting 8. The sliding metal fitting 7 is mounted to the diagonal brace 2a slidably in its longitudinal direction. The linkage metal fitting 8 is arranged between the sliding metal fitting 7 and the end of the lower crosspiece body 5 and is coupled rotatably to the sliding metal fitting 7 and the end of the lower crosspiece body 5 in a plane of the crossing diagonal brace 2 by a coupling bolt 9, 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lower frame for a frame scaffold and an end connecting bracket of the lower frame for a frame scaffold which are installed for the purpose of preventing a worker from falling due to a crossing of a frame scaffold temporarily provided at a construction site such as a building or civil engineering. Even if it is installed in a cross brace installed especially between building frames with a narrow installation interval (for example, 1.2 m or less), the cross brace can be folded compactly, and it can be retrofitted to a ready-made cross brace. Things.

  The framework scaffold is constructed with predetermined steel pipes at predetermined intervals of factory-built units of the factory, fixed with cross braces between the respective frames, and a cloth frame with a clamp between the adjacent frames. It is temporarily installed in multiple spans and multiple steps by bridging “scaffold boards”, and is widely used in construction sites such as architecture and civil engineering.

  In addition, since this kind of framework scaffold has a large opening between the cross bracing between each of the building frames and the scaffolding plate located underneath, a worker from this opening particularly in high places. There was a risk of accidental falling and there was a safety issue for workers.

  For this reason, at the time of temporary construction of the framework scaffold, it is mandatory to install a lower frame for the framework scaffold at a position 40 cm or less in height from the floor surface of the scaffold plate on each floor for the purpose of preventing workers from falling down.

  As this type of frame scaffolding lower crosspiece, it is attached to the cross brace, and when the cross brace is rotated about an intermediate rotation pin as an axis and opened in an X shape, it can be installed horizontally near the lower part of the cross brace, and There is known a configuration in which a brace is folded so that the brace can be folded along a longitudinal direction of the cross brace.

  For example, Patent Literature 1 discloses a lower frame for a scaffold consisting of a lower bracket main body and a fixing bracket and a slide bracket attached to both ends of the lower rail main body and connected to the vicinity of an end flat portion of a cross brace, respectively. A bar is disclosed.

  Briefly, one end flat portion having one crossing streak penetrates the through hole of the slide fitting, and the slide fitting is positioned before the flat end portion having the cross streak.

  The fixing bracket is fixed by a tightening bolt in front of the other flat portion at the crossing streak, and the fixing bracket is a tightening bolt that also serves as a tightening bolt that determines the rotation range of the lower beam main body and a rotating shaft, and the fixing bracket itself. And a hinge for opening and closing.

  In particular, since there is a gap between the through hole of the slide fitting and the cross bracing (see FIG. 4 of Patent Document 1), and the fastening bolt of the fixing fitting is the rotation axis of the lower beam main body, the framework scaffold is provided. The lower rail can be folded together with the cross brace as long as the slide bracket can move with respect to the cross brace.

  Further, Patent Literature 2 discloses a cross bar for protecting a cross bar in which a slide fitting having a frame-shaped opening is fixed to both ends. The protective bar is slidably attached to the brace by inserting the slide fitting into each of the lower ends of the brace members opened in the X shape of the cross brace, and the frame-shaped opening of the slide bracket is attached. A metal fitting for preventing the bracing material from being pulled out is fixed to both ends of the protection bar.

  In particular, the slide fitting is slidably attached to the bracing material by penetrating the frame-shaped opening of the sliding fitting through the lower end of each of the bracing materials opened in the X shape of the cross braces. The protective bar is designed to be folded together with cross braces as long as the slide bracket can move with respect to the bracing material.

Utility Model Registration No. 3151937 JP-A-11-223011 JP 2010-275777 A

  The lower rails for framed scaffolds disclosed in Patent Literatures 1 and 2 (the “protection rails” in Patent Literature 2) are all provided with through holes (“Frame-shaped openings” in Patent Literature 2) of the slide fittings. The gap between the braces penetrating the hole allows the slide bracket to be folded together with the cross braces only within the range in which the slide bracket can move.

  For this reason, there is naturally a limit to the range in which the lower frame for the frame scaffold can be rotated around the end of the slide bracket side as a rotation axis, particularly at a cross brace installed between building frames with a narrow interval (1.2 m or less). Then, there was a problem that the cross bracing could not be folded compactly to the end.

  In addition, in order to install it on a ready-made cross brace, it is necessary to pass the brace from the end into the through hole of the slide bracket, so there is a problem that attachment to the ready-made cross brace is extremely troublesome or impossible. .

  The present invention has been made in order to solve the above-described problems.Especially, even if it is installed in a cross bracing that is installed between narrowly installed building frames (for example, 1.2 m or less), the cross bracing is folded compactly. It is an object of the present invention to provide a lower frame for a scaffolding scaffold, which can be retrofitted to an existing cross brace.

  The present invention relates to a frame scaffolding bottom rest installed below a crossed brace consisting of a set of foldable braces that crosses in an X-shape in an open state, and is horizontally hung below the crossed brace. A lower cross body to be passed, end fittings respectively attached to both ends of the lower cross body and connected to the brace, wherein the end connection metal is slidable in a longitudinal direction of the brace. An attached slide fitting, and a link fitting which is installed between the slide fitting and an end of the lower crosspiece main body, and is rotatably connected to an end of the slide fitting and the lower crosspiece main body in the plane of the cross brace. And characterized in that:

  In addition, the range of application can be expanded by detachably attaching the end connection fitting to the cross brace so that it can be retrofitted to a ready-made cross brace.

  According to the present invention, in particular, the end connection fittings attached to both ends of the lower cross main body are provided between the slide fitting slidably mounted on the cross brace and the end of the slide metal and the lower cross main body. The end of the lower beam main body is positioned with respect to the brace by being installed, and being constituted by the slide fitting and a link fitting rotatably connected to the end of the lower beam main body in the plane of the cross bracing. Since the lower beam body can be rotated at two positions, the lower beam body can freely rotate within a range of approximately 180 ° with respect to the brace.

  With this, even when installing on a cross brace installed between building frames with a narrow installation interval (1.2 m or less), when folding, it should be compactly folded almost completely along the side of the cross brace Can be.

  In addition, since the slide fitting is detachably attached to the brace, it can be retrofitted to a ready-made cross brace.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of the present invention and illustrates a framed scaffold on which a lower beam for a framed scaffold is installed, and FIGS. 1 (a) and (b) are partial front views of the framed scaffold. FIG. 2 is an end view taken along the line II in FIGS. 1 (a) and 1 (b). It is a front view of the cross brace and the lower crosspiece for framework scaffolds folded together with the cross brace. It is an exploded perspective view of an end connection metal fitting. FIG. 2 is an enlarged view of a portion b in FIGS. 1 (a) and 1 (b). FIG. 6 (a) and (b) are partial front views of a framework scaffold in which another embodiment of the present invention is a framework scaffold provided with a framework cross. FIG. 7 is an enlarged sectional view of a portion C in FIGS. 6 (a) and 6 (b). FIGS. 8 (a) and 8 (b) are a plan view and a side view, respectively, of a slide fitting. FIG. 9 (a) and FIG. 9 (b) are a plan view and a side view, respectively, of the link fitting.

  1 to 5 show one embodiment of the present invention and show a part of a framework scaffold. In the figure, a plurality of building frames 1 are arranged at predetermined intervals, each building frame 1,1 is fixed by a cross brace 2, and a scaffold plate 3 is placed between the horizontal lands 1a, 1a of each adjacent building frame 1,1. Are temporarily provided at a plurality of intervals and at a plurality of stages.

  The cross brace 2 is configured to be able to fold the two brace 2a, 2a by rotating about the middle connecting pin 2b. That is, the two braces 2a, 2a rotate about the connecting pin 2b and open in an X-shape (see FIGS. 1 (a) and 1 (b)), and rotate in the opposite direction to close in an I-shape (folding). (See FIG. 3).

  Further, flat portions 2c, 2c are formed at both ends of each of the braces 2a, 2a, and the flat portions 2c, 2c are connected to the side surfaces of the vertical ground 1b, 1b of the adjacent building frames 1, 1 to form the building frame. It is installed detachably between 1,1. Note that the braces 2a, 2a are formed of steel pipes having a smaller diameter than the horizontal land 1a and the ground 1b of the building frame 1.

  In addition, in the opening A formed between each cross brace 2 and each scaffold plate 3, the lower beam 4 for the frame scaffold for preventing the fall of the worker is horizontally positioned at a height of 40 cm or less from the scaffold plate 3. is set up.

  The lower beam 4 for the framework scaffold is composed of a lower beam body 5 and a pair of connecting fittings 6, 6 attached to both ends of the lower beam body 5, respectively. The connecting fitting 6 is attached to the lower end of the brace 2a. It comprises a slide fitting 7 slidably attached in the longitudinal direction of the brace 2a and a link fitting 8 installed between the slide fitting 7 and an end of the lower beam main body 5 (see FIG. 4).

  The slide fitting 7 is formed in a groove shape that opens to the link fitting 8 side and surrounds three sides of the brace 2a excluding the link fitting 8 side. Further, flange portions 7a, 7a extending in parallel to the link fitting 8 side are formed, and the flange portions 7a, 7a are rotatably and rotatably provided by connecting bolts 9 inside the later-described flange portions 8a, 8a of the link fitting 8. It is detachably connected.

  The slide fitting 7 slides freely in the longitudinal direction of the brace 2a, but is positioned so as to be positioned at the flat portion 2c so as not to come off from the end of the brace 2a.

  The link fitting 8 is formed to have a predetermined length in the longitudinal direction of the lower beam main body 5. Further, it is formed in a groove shape opening on the side of the brace 2a, and has a groove width and depth capable of containing the brace 2a and the lower beam main body 5.

  Further, flanges 8a, 8a extending in parallel with the direction of the slide fitting 7 are formed at the end on the side of the slide fitting 7, and the flanges 8a, 8a are connected to the outside of the flanges 7a, 7a of the slide fitting 7 by connecting bolts 9. It is rotatably and detachably connected.

  The lower beam main body 5 is formed of a steel pipe having substantially the same diameter as the brace 2a, and is formed to have an optimum length in accordance with the interval between the ends of the X-shaped brace 2a.

  Both ends 5a, 5a of the lower beam main body 5 are inserted into end grooves of the link fitting 8, and are rotatably and detachably connected to both sides in the end grooves by connecting bolts 10.

  In such a configuration, the brace 2a, 2a rotates about the intermediate connecting pin 2b and opens in an X-shape, and at the same time, the slide fittings 7, 7 slide in the direction of the ends of the brace 2a, 2a, respectively. It stops at the position of the parts 2c, 2c.

  Also, in parallel with the movement of the slide fittings 7,7, the connecting part between the slide fitting 7 and the link fitting 8, and the connecting part between the end of the lower beam main body 5 and the link fitting 8 are connected with connecting bolts 9 and 10, respectively. As a result, the lower frame 4 for the framework scaffold is bridged near the lower part of the cross brace 2, that is, in a state of extending substantially horizontally between the lower ends of the brace 2a. Thereby, the opening A between the cross brace 2 and the scaffold 3 is narrowed, and the safety of the worker is ensured.

  In addition, as shown in the figure, when the opening of the X-shaped brace 2a, 2a is slightly narrow, the lower beam 4 for the framework scaffolding bridged between the lower ends of the brace 2a, 2a is not necessarily horizontal. The connecting portion between the slide fitting 7 and the link fitting 8 and the connecting portion between the end of the lower beam main body 5 and the link fitting 8 are slightly bent downward by their own weight. The bottom portion 8b abuts on the bottom 8b in the end groove of the link fitting 8 to prevent rotation at the connecting portion between the end of the lower crosspiece main body 5 and the link fitting 8 (see FIG. 5). Will not go down any further. Further, even if the worker puts his or her feet on the lower beam main body 5, the impact does not cause the lower beam main body 5 to keep shaking in the longitudinal direction.

  On the other hand, at the same time that the brace 2a, 2a rotates about the connecting pin 2b and closes in an I-shape, the slide fittings 7, 7 slide toward the center of the brace 2a, 2a, and the slide fitting 7 and the link fitting 8 The connecting portion and the connecting portion between the end of the lower beam main body 5 and the link fitting 8 are rotated around the connecting bolts 9 and 10, respectively, so that the lower beam main body 5 and the link fitting 8 of the lower beam 4 for the framework scaffolding are connected. It is attached to the side portions of the braces 2a, 2a in a substantially rod-like manner (see FIG. 3).

  In this case, in particular, the connecting fitting 6 is freely rotated at two points, that is, the connecting part between the slide fitting 7 and the link fitting 8 and the connecting part between the end of the lower beam main body 5 and the link fitting 8, so that the lower part is formed. Since the beam main body 5 can rotate in a range of approximately 180 degrees with respect to the brace 2a, the lower beam 4 for the framed scaffold is in a state of being substantially in contact with the sides of the beams 2a, 2a even if the lower beam body 5 is short. Can be folded.

  Note that FIG. 3 illustrates a state before being completely folded so that the positional relationship between the brace 2a, 2a of the cross brace 2 and the lower beam 4 for the framework scaffold can be easily understood.

  FIGS. 6 to 8 illustrate another embodiment of the present invention, in which the connecting fitting 6 includes a link fitting 11 instead of the link fitting 8 described in the above embodiment.

  The link fitting 11 is formed to have a predetermined length in the longitudinal direction of the lower beam main body 5, is formed in a groove shape opened on the side of the brace 2 a, and has an inner width capable of enclosing the brace 2 a and the lower beam main body 5. It is formed wide.

  Further, flange portions 11a, 11a extending parallel to the direction of the slide metal fitting 7 are formed at the end on the side of the slide metal fitting 7, and a flange portion 11b extending parallel to the direction of the lower rail main body 5 at the end portion on the side of the lower beam main body 5. , 11b are formed.

  The flange portions 11a, 11a are rotatably and detachably connected to the inside of the flange portions 7a, 7a of the slide fitting 7 by connecting bolts 9, and the flange portions 11b, 11b are connected to both ends of the lower beam main body 5. Are rotatably and detachably connected to each other by connecting bolts 10. Other configurations are almost the same as those of the embodiment described with reference to FIGS.

  According to this embodiment, in particular, since the connecting portion between the end of the lower beam main body 5 and the link fitting 11 freely rotates by approximately 360 °, it is possible to freely cope with a change in the interval between the building frames 1 and 1. it can. That is, it is possible to cope with a case where the distance between the building frames 1 and 1 is reduced to a position where the connecting portion between the lower beam main body 5 and the link fitting 11 is at a right angle.

  The present invention can be compactly folded even if it is installed in a cross brace installed between building frames with a narrow installation interval (1.2 m or less), and can be retrofitted to a ready-made cross brace. .

1 building frame
1a Building 2 Cross Bracing
2a brace
2b Connecting pin
2c Flat part 3 Scaffolding plate 4 Lower crossing 5 for framed scaffold Lower crossing main body 6 Connection metal fitting 7 Slide metal fitting
7a Flange part 8 Link bracket
8a Flange 9 Connecting bolt
10 Connecting bolt
11 Link bracket
11a Flange
11b Flange

Claims (3)

  A lower part for a framework scaffold installed near a lower part of an intersecting brace composed of a pair of foldable braces that intersects in an X shape in an open state, and a lower part horizontally hung near the lower part of the crossing brace. A crosspiece main body, and end connection fittings respectively attached to both ends of the lower crosspiece main body and connected to the brace, respectively, and the end connection fitting is slidably mounted in a longitudinal direction of the brace. A slide fitting and a link fitting that is provided between the slide fitting and an end of the lower crosspiece main body, and that is rotatably connected to an end of the slide fitting and the lower crosspiece main body in a plane of the cross brace. A lower beam for a framework scaffold, which is characterized in that:   2. The lower scaffold for a scaffold according to claim 1, wherein the slide fitting is detachably attached to the brace. 3.   An end of a lower frame for a scaffold for scaffolding, which crosses an X-shape in an open state and is connected to an end of a lower frame for a scaffold installed near the lower part of a crossed brace composed of a pair of foldable braces. A connection fitting, which is provided between a slide fitting slidably mounted in the longitudinal direction of the brace and an end of the slide fitting and the lower crosspiece main body, and is provided at an end of the slide fitting and the lower crosspiece main body portion. A link fitting rotatably connected in the plane of the cross brace, and an end connecting fitting of the lower beam for the framework scaffold.

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