JP6027508B2 - Suspension scaffold suspension structure - Google Patents

Description

  The present invention relates to a suspension structure for a suspension scaffold that is suspended by a suspension chain on a structure such as a bridge for maintenance work or the like under the bridge.

  A suspension scaffold that is suspended by a suspension chain on a structure such as a bridge is a secondary steel pipe (also called a rolling steel pipe) that is perpendicular to the main steel pipe on a horizontally placed main steel pipe (also called a parent steel pipe). The scaffolding plate is supported by the secondary steel pipe and is suspended by a suspension chain on a structure such as a bridge. At this time, if the main steel pipe is directly suspended by the suspension chain, the main steel pipe is located between the scaffold plates adjacent to both sides of the suspension chain with the scaffold plate placed on the secondary steel pipe in a direction parallel to the main steel pipe. Since a wide gap is formed in which two suspension chains that suspend the U-turn at the U-turn part are formed, not only the plate material and its laying work for closing this wide gap are required, but also the entire scaffold Safety will be adversely affected. In order to solve such a problem, a hanging metal fitting as described in Patent Document 1 has been proposed.

JP 2009-108473 A

  The conventional hanging metal fitting described in Patent Document 1 is fixed to a short pipe material fitted around a main steel pipe by welding the lower end of the belt-like plate in parallel with the axis of the pipe material (the axis of the main steel pipe). The hook formed on the free end of the lower screw shaft of the turnbuckle is hooked on the upper end of the belt-like plate, and the hook formed on the free end of the upper screw shaft of the turnbuckle is hooked on the hanging chain. Yes, since the strip plate is only sandwiched between the scaffold plates in the plate thickness direction, there is no longer a wide gap as in the prior art, but the strip plate must be joined and integrated with the pipe material by welding. Therefore, not only the manufacturing cost is increased, but also the load in the pulling direction acts on the welded portion, so that the safety is lowered unless the welding strength (quality) is sufficiently increased, and it cannot be put into practical use. In addition, since the hook formed on the free ends of the upper and lower screw shafts of the turnbuckle is hooked on the strip plate and the hanging chain, the hook is easily detached when an external force acts in the direction of removing the hook, It can be a very dangerous situation. Furthermore, since the suspension chain hung on the hook cannot be slid lightly and smoothly with respect to the hook, the suspension chain suspended from the structure is operated to increase the suspension height. Large adjustment is also difficult.

The present invention proposes a suspension scaffold suspension structure capable of solving the above-described conventional problems, and the suspension scaffold suspension structure according to the present invention is the same as the embodiment described later. In order to facilitate understanding of the relationship, the reference numerals used in the description of the examples are shown in parentheses, and the main steel pipe (22) is placed on the main steel pipe (22) arranged horizontally. A secondary steel pipe (23) is supported at right angles to the suspension, and a suspension means (1) for suspending the main steel pipe (22) of the suspension scaffold (16) in which the scaffold plate (27) is supported by the secondary steel pipe (23). ) Is an annular body (2) that is externally fitted to the main steel pipe (22), and a lower end of the annular body (2) is connected to the scaffolding plate (27) via the adjacent scaffolding plate (27). A hanging rod (3) extending upward, and a hanging ring connected to the hanging rod (3) via a length adjusting screw mechanism (4) and suspended by a hanging chain (18) (5) and In the scaffolding plate suspension structure, the annular body (2) is composed of a belt-like plate (6) that is bent in an annular shape and has both ends stacked one above the other, and at the lower end of the suspension rod (3), A threaded shaft portion (3b) that vertically penetrates the overlapping portion (6a) at both ends of the belt-like plate of the annular body (2) is provided, and the annular body (2) and the suspension rod (3) are the main steel pipe Within the range from the upper surface height of (22) to the upper surface height of the secondary steel pipe (23), it is screwed onto the screw shaft portion (3b) and overlaps both ends (6a) of the belt-like plate of the annular body (2) Is configured to be coupled by a pair of nuts (7a, 7b) sandwiching from above and below.

  In the structure of the present invention, the suspension means having the above structure is suspended from a structure such as a bridge by a suspension chain inserted through the suspension ring at the upper end to an appropriate height, and the annular body at the lower end of the suspension means. The main steel pipe is inserted into the main steel pipe, and the main steel pipe is suspended almost horizontally by a plurality of suspension means. After the secondary steel pipes are placed in parallel at appropriate intervals on the plurality of main steel pipes suspended in parallel in this way in a direction orthogonal to the main steel pipe, a scaffold is placed on the secondary steel pipes. The plate is placed in a direction parallel to the main steel pipe, and a coupling structure portion including a pair of upper and lower nuts for connecting the annular body at the lower end of each suspension means and the suspension rod is an upper surface of the main steel pipe. And the upper and lower surfaces of the secondary steel pipe supported by the main steel pipe are arranged in an upper and lower region, so that a coupling plate including a scaffold plate placed on the secondary steel pipe and the pair of upper and lower nuts, Will not interfere with each other. Moreover, since there is only a hanging rod between the coupling structure portion and the length adjusting screw mechanism in the height region where the scaffold plate is laid, the scaffold plate is sandwiched between the hanging plates. If laying down, only a narrow gap is formed between the scaffolding plates so that the hanging rod can pass.

  As described above, according to the configuration of the present invention, even when the outer diameter of the suspension rod is slightly larger than the thickness of the strip-shaped plate of the conventional suspension means, the main steel pipe is directly suspended by the suspension chain. In comparison, since the gap formed between the scaffolding plates is greatly reduced, special materials and work for closing the gaps between the scaffolding plates are not required. And it is the structure which connects the cyclic | annular body which penetrates a main steel pipe, and a hanging rod using the presence of the up-and-down area | region between the upper surface of a main steel pipe, and the upper surface of the said secondary steel pipe supported by the said main steel pipe. Thus, the annular body is formed by bending the belt-like plate, and the annular body and the pair of nuts are suspended by the screw shaft portion at the lower end of the suspension rod passing through the overlapping portion of the belt-like plate at both ends of the annular body. The structure which couple | bonds a hanging hook can be employ | adopted and cost reduction and the improvement of safety | security can be aimed at rather than using the conventional hanging means which had to couple | bond both by welding. In addition, since the suspension chain is inserted through the suspension ring at the upper end of the suspension means, not only is the safety improved compared to the conventional configuration in which the hook is hooked, but also the suspension means The suspension chain can be easily slid, and the suspension height suspended from the structure can be easily operated to easily adjust the suspension height.

  When carrying out the present invention, specifically, the distance from the upper surface of the main steel pipe (22) to the upper surface of the upper nut (7a) of the upper and lower pair of nuts is the outer surface of the auxiliary steel pipe (23). It can be configured not to be larger than the diameter. According to this configuration, regardless of the method of connecting the main steel pipe and the secondary steel pipe that intersect with each other, for example, even in a situation where the main steel pipe and the secondary steel pipe are in contact with each other, the hanging means can be used without hindrance. I can do it.

  Further, the belt-like plate (6) forming the annular body (2) is formed in an arc shape in which the cross section of the region excluding the overlapping portion (6a) at both ends is curved inwardly of the annular body (2). And while improving the intensity | strength of the said annular body, the sliding of the said annular body and the main steel pipe inserted and supported by this can be improved, and an assembly operation can be made easy.

Further, the length adjusting screw mechanism (4) includes a cylindrical body (8) having a lower end (10a) externally fitted to a head (3a) formed at an upper end of the hanging rod (3). A screw hole portion (8a) provided concentrically at the upper end of the cylindrical main body (8), and a screw shaft (9) screwed into the screw hole portion (8a) so as to be freely inserted into and removed from the cylindrical main body (8). The cylindrical body (8) and the hanging rod (3) are centered on the head (3a) and the relative rotation around the axis of the hanging rod (3). The hanging ring (5) is formed of a belt-like plate (14) which is bent in an annular shape and is overlapped with each other up and down. The upper end of the screw shaft (9) can be passed through the overlapping portion (14a) at both ends of the belt-like plate of the lower ring (5) and fixed by the nut (15). According to this configuration, the length adjusting screw mechanism is compared with a case where a general turnbuckle comprising a pair of upper and lower screw shafts and a long cylindrical female screw body for operation having screw holes at both ends is used. Thus, for example, the bolt in the bolt and nut for fastening and integrating the overlapping portions on both ends of the belt-like plate of the hanging ring can be used as the screw shaft of the length adjusting screw mechanism, thereby reducing the number of parts. In addition to cost reduction, the suspension chain is inserted into the suspension ring, so there is no risk that the suspension means of the scaffolding plate will come off unexpectedly from this suspension chain. Can be increased. Also in this case, the belt-like plate (14) forming the hanging ring (5) has a circular cross section of the region excluding the overlapping portion (14a) at both ends thereof, which protrudes inside the hanging ring (5). By forming it in an arc shape, it is possible to increase the strength of the suspension ring and improve the sliding of the suspension chain with respect to the suspension means of the scaffold plate, thereby facilitating the assembly work.

  Further, the cylindrical body (8) of the length adjusting screw mechanism (4) includes a large-diameter cylindrical body (10) whose lower end is externally fitted to the upper end head (3a) of the suspension rod (3), and an upper end. And a small-diameter cylindrical body (11) having a screw hole (8a) and a lower end that is fitted in the large-diameter cylindrical body (10) and connected by a fixing pin (12) that penetrates in the diameter direction. The through-hole 13 for rotation can be provided in the small-diameter cylinder 11 protruding from the large-diameter cylinder 10. According to this structure, manufacture is easy compared with the case where the said cylindrical main body is comprised from one pipe material, and also the upper end head of a hanging rod can be enlarged, and it can also raise hanging strength. It becomes easy. In addition, it is difficult to rotate and operate the cylindrical main body as compared with the case where the cylindrical main body is made of a single pipe material. Since an appropriate rod-shaped tool can be inserted and rotated, it can be used practically without any problem.

FIG. 1A is a longitudinal front view of the hanging means, and FIG. 1B is a longitudinal side view of the same. FIG. 2A is a partially longitudinal front view showing a joint location between a main steel pipe and a secondary steel pipe, and FIG. 2B is a longitudinal sectional side view of the same part. FIG. 3 is a partially longitudinal front view showing the suspension structure of the suspension scaffold according to the present invention. FIG. 4 is a longitudinal front view showing a suspension scaffold suspended from a bridge by the suspension structure of the present invention.

  The suspension means 1 shown in FIG. 1 includes an annular body 2 fitted over the main steel pipe, a suspension rod 3 having a lower end connected to the annular body 2 and extending upward, and a length extending from the suspension rod 3. The suspension ring 5 is connected via a screw mechanism 4 for adjustment. The annular body 2 is composed of a belt-like plate 6 which is bent into a ring shape and whose both ends are stacked on top of each other. The belt-like plate 6 has a cross section in a region excluding its overlapping portion 6a. It is formed in the circular arc shape which curves inside. The hanging rod 3 is made of a round steel bar having a circular head portion 3a concentrically formed at the upper end and an appropriate length screw shaft portion 3b formed at the lower end. A pair of upper and lower nuts 7a and 7b screwed into the screw shaft portion 3b so as to sandwich the both-end overlapping portion 6a from above and below in a state of vertically penetrating the both-end overlapping portion 6c of the annular body 2 It is connected to the overlapping portion 6a. 3c is a protrusion formed integrally with the lower end of the screw shaft portion 3b in order to prevent the lower nut 7b from falling off. The head 3 a formed on the upper end of the hanging rod 3 has an outer shape corresponding to the lower half of a sphere whose center is located above the head 3 a and on the axial extension line of the hanging rod 3. .

  The length adjusting screw mechanism 4 includes a cylindrical main body 8, a screw hole portion 8 a concentrically provided at the upper end of the cylindrical main body 8, and the screw hole portion removably inserted into the cylindrical main body 8. It is comprised from the screw shaft 9 screwed to 8a. The cylindrical body 8 is connected to a large-diameter cylindrical body 10 by a fixed pin 12 having the screw hole portion 8a at the upper end and a lower end fitted into the large-diameter cylindrical body 8 and penetrating in the diameter direction. The through-hole 13 for rotation operation is provided in the location which consists of the cylindrical body 11 and protrudes from the said large diameter cylindrical body 8 of the small diameter cylindrical body 11. FIG. The lower end portion of the large-diameter cylindrical body 10 is externally fitted to the head portion 3a at the upper end of the hanging rod 3, and the relative rotation around the axis of the hanging rod 3 and 360 degrees centering on the head portion 3a. It is drawn into a hemispherical portion 10a that suspends the head 3a so as to freely swing in any direction.

  The suspension ring 5 is composed of a belt-like plate 14 that is bent in a ring shape and has both ends stacked one above the other, like the ring body 2 at the lower end. The cross section of the area to be removed is formed in an arc shape that projects inside the hanging ring 5. The screw shaft 9 of the length adjusting screw mechanism 4 is a bolt having a head portion 9a, and the screw shaft 9 is passed through the belt plate both ends overlapping portion 14a of the suspension ring 5 outward from the inside. In this state, the belt 15 is joined to the suspension ring 5 by fastening the band-like plate both ends overlapping portion 14a of the suspension ring 5 with the nut 15 screwed onto the screw shaft 9 and the head portion 9a. When the nut 15 is screwed into the screw hole 8a of the cylindrical main body 8 (small-diameter cylindrical body 11) to the limit position where the nut 15 contacts the end surface of the small-diameter cylindrical body 11, the tip portion of the screw shaft 9 is It has a length that reaches the inside of the through-hole 13 for rotating operation. The deformed portion 9b is formed by caulking on the tip peripheral surface of the screw shaft 9 through the through-hole 13 and the cylindrical body 8 is screwed When the screw 9 is rotated in the screw return direction, the deformed portion 9b prevents the distal end portion of the screw shaft 9 from entering the screw hole portion 8a.

  As shown in FIG. 4, the suspension means 1 having the above configuration is used to suspend a suspension scaffold 16 from a structure 17 such as a bridge pier through a suspension chain 18. The suspension chain 18 includes a chain suspension ring 21 attached by a U-shaped clamp 20 to the side of the lower horizontal plate portion 19a of the H-shaped steel 19 disposed on the lower side of the structure 17, and a suspension chain. By hooking a hook (not shown) that is inserted through the suspension ring 5 at the upper end of the lowering means 1 and is connected to one end of the suspension chain 18 into the loop of the suspension chain 18, It is a conventionally well-known thing that suspends the suspending means 1 at a predetermined height.

  If the suspending means 1 is suspended at appropriate intervals in the length direction of the H-shaped steel 19 in the above manner, the suspension means 1 is suspended on the side of the lower horizontal plate portion 19a of each H-shaped steel 19 and the H-shaped steel 19 The main steel pipe 22 is inserted into the annular body 2 at the lower end of each suspension means 1 in series in the length direction. When the main steel pipes 22 are suspended below the H-shaped steels 19 via the suspending means 1 in this way, the secondary steel pipes 23 oriented perpendicular to the main steel pipes 22 are located above the main steel pipes 22. In addition, the H-section steel 19 is placed at appropriate intervals in the length direction.

  For example, as shown in FIG. 2, the main steel pipe 22 and the secondary steel pipe 23 are coupled and integrated with each other by a conventionally known pipe clamp unit 24 at a location where both the steel pipes 22 and 23 intersect. The pipe clamp unit 24 is formed by connecting and integrating a pipe clamp 25 for holding the main steel pipe 22 and a pipe clamp 26 for holding the secondary steel pipe 23 in a back-to-back state. The base members 25a and 26a, the presser members 25b and 26b, and the fastening bolts 25c and 26c that are pivotally supported by the base members 25a and 26a and can be freely engaged with and disengaged from the presser members 25b and 26b. It is. The constituent members 25a to 26b of the pipe clamps 25 and 26 are formed of a plate material, but have a three-dimensional structure in which both sides are bent inward to obtain a required strength. The thickness is very large. Accordingly, a gap about half the diameter of each steel pipe is formed between the main steel pipe 22 and the secondary steel pipe 23 which are coupled to each other in the orthogonal direction by the pipe clamp unit 24 as shown in the figure.

When the scaffolding plate supporting structure composed of the main steel pipe 22 and the secondary steel pipe 23 is suspended almost horizontally by the suspending means 1 as described above, as shown in FIG. The portion connecting the annular body 2 supporting the suspension rod 22 and the suspension rod 3, that is, the portion from the lower end of the screw shaft portion 3b of the suspension rod 3 to the upper surface of the upper nut 7a is the height of the upper surface of the main steel pipe 22. from which it falls within the range S to the upper surface height of the auxiliary steel pipe 23, never above the upper surface of the sub-steel pipe 23, such as the upper nut 7a protrudes. Of course, in the illustrated embodiment, the distance from the upper surface height of the main steel pipe 22 which is suspended by the hanging means 1 as described above to the upper surface height of the upper nut 7a is than the outer diameter of the auxiliary steel pipe 23 Since it is configured not to be large, the upper nut 7 a protrudes above the upper surface of the secondary steel pipe 23 even in a situation where the secondary steel pipe 23 is placed directly on the main steel pipe 22. There is no.

  Therefore, the scaffolding plate 27 is laid on the secondary steel pipe 23 so that the length direction of the scaffolding plate 27 is parallel to the length direction of the main steel pipe 22 and the adjacent scaffolding plates 27 are in contact with each other. When 16 is completed, the scaffolding plate 27 may be placed on the secondary steel pipe 23 so that the suspension rod 3 protruding vertically upward from the secondary steel pipe 23 is sandwiched at the position of the suspension means 1. On the secondary steel pipe 23, the holding member 26b of the pipe clamp 26 of the pipe clamp unit 24 and the free end portion of the fastening bolt 26c protrude above the upper surface of the secondary steel pipe 23, and the side of the holding member 26b Since the width (the width in the length direction of the secondary steel pipe 23) is slightly larger than the outer diameter of the suspension rod 3 of the suspension means 1, when laying the scaffold plate 27, as shown in FIG. In order to narrow the gap between the scaffolding plates 27 located on both sides of the hanging rod 3 to the minimum, the side edges 27a and 27b adjacent to each other of the scaffolding plate 27 located on both sides of the hanging rod 3 are connected to the pipe. The clamp unit 24 is placed on the pressing member 26b of the pipe clamp 26. Of course, even if the side edges 27a and 27b of the scaffolding plate 27 located on both sides of the suspension rod 3 are arranged so as to sandwich the pressing member 26b of the pipe clamp 26 in the pipe clamp unit 24 from both sides, If the clearance formed in is only a little wider than the outer diameter of the suspension rod 3 of the suspension means 1, and if measures to close the clearance are unnecessary, the scaffold plate 27 is laid in this way. Also good.

  As described above, the suspension scaffold 16 composed of the main steel pipe 22, the secondary steel pipe 23, and the scaffold plate 27 can be suspended by the suspension means 1 and the suspension chain 18. If there is a slack in the hanging chain 18 that is being hung, the length adjusting screw mechanism 4 of the hanging means 1 located in that place or the periphery thereof is operated to operate the hanging means 1. The overall length can be adjusted, and the slack of the hanging chain 18 can be eliminated. Therefore, the length adjusting screw mechanism 4 of each suspending means 1 is used in a state in which the screw shaft 9 is positioned at an intermediate position in the adjustment range of the screw shaft 9 with respect to the screw hole portion 8a of the cylindrical body 8. Is desirable. If used in this way, in the suspending means 1 at a position where it is desired to extend the entire length and lower the suspending height of the main steel pipe 22, the cylindrical body 8 is rotated in the twisting-back direction with respect to the screw shaft 9, In the suspending means 1 where the cylindrical main body 8 is lowered with respect to the screw shaft 9 and the main steel pipe 22 is desired to be increased in height by shortening the entire length, the cylindrical main body 8 is moved relative to the screw shaft 9. What is necessary is just to raise the cylindrical main body 8 with respect to the screw shaft 9 by rotating in the direction to screw. At this time, an appropriate rod-shaped tool is passed through the through-hole 13 included in the small-diameter cylindrical body 11 of the cylindrical main body 8, and the cylindrical main body 8 can be strongly rotated with the rod-shaped tool.

  The suspension structure of the suspension scaffold according to the present invention is designed to narrow a gap formed between the scaffolding plates when the suspension scaffold is suspended from a structure such as a bridge via a suspension chain, and in particular to close the gap. It can be used as a means that can eliminate the need for members and work.

DESCRIPTION OF SYMBOLS 1 Hanging means 2 Ring body 3 Hanging rod 3a Head of hanging rod 3b Screw shaft part of hanging rod 4 Length adjusting screw mechanism 5 Hanging ring 6, 14 Strip plate 6a, 14a Both ends overlapping portion 7a, 7b, 15 Nut 8 Cylindrical body 8a Screw hole portion 9 Screw shaft 9a Screw shaft head 10 Large-diameter cylindrical body 10a Hemispherical portion 11 Small-diameter cylindrical body 12 Fixing pin 13 Through lateral hole 16 Suspended scaffold 17 Structure body 18 such as pier Chain for suspension 19 H-shape steel 20 C-shaped clamp 21 Chain suspension ring 22 Main steel pipe 23 Secondary steel pipe 24 Pipe clamp unit 25, 26 Pipe clamp 27 Scaffolding plate

Claims (6)

On the horizontally disposed main steel pipe, a secondary steel pipe is supported at a right angle to the main steel pipe, and a suspension means for suspending the main steel pipe of a suspension scaffold in which a scaffold plate is supported by the secondary steel pipe, An annular body externally fitted to the main steel pipe, a suspension rod having a lower end connected to the annular body and extending above the scaffold plate via the adjacent scaffold plates, and a length adjustment to the suspension rod In the scaffolding plate suspension structure comprising a suspension ring connected via a screw mechanism and suspended by a suspension chain, the annular body is formed from a belt-like plate that is bent into an annular shape and has both ends stacked one above the other. The lower end of the suspension rod is provided with a screw shaft portion penetrating in an up-down direction through the overlapping portion of both ends of the belt-like plate of the annular body, and the annular body and the suspension rod have a height higher than the upper surface of the main steel pipe. within the range up to the upper surface height of the auxiliary steel pipe from being, on the screw shaft portion Fitted has been coupled by a pair of nuts sandwiching the strip-shaped plate ends overlapping portion of the annular body from above and below, hanging suspended structure of the scaffold.   The suspension scaffold suspension according to claim 1, wherein a distance from an upper surface of the main steel pipe to an upper surface of an upper nut of the pair of upper and lower nuts is not larger than an outer diameter of the sub steel pipe. Construction.   The suspension scaffold according to claim 1 or 2, wherein the belt-like plate forming the annular body is formed in an arc shape in which a cross section of a region excluding overlapping portions thereof is bent inward of the annular body. Hanging structure. The length adjusting screw mechanism includes a cylindrical main body having a lower end externally fitted to a head formed at the upper end of the hanging rod, and a screw hole provided concentrically at the upper end of the cylindrical main body. The cylindrical main body and the hanging rod are formed by a relative rotation around the axis of the hanging rod, and The outer ring is fitted so as to be capable of relative bending movement in an arbitrary direction of 360 degrees around the head, and the suspension ring is formed of a belt-like plate that is bent in an annular shape and has both ends stacked one above the other. The suspension structure for a suspension scaffold according to claim 1 or 2, wherein an upper end of the screw shaft passes through an overlapping portion of both ends of the belt-like plate of the ring and is fixed by a nut.   The suspension scaffold according to claim 4, wherein the belt-like plate forming the suspension ring is formed in an arc shape in which a cross section of a region excluding overlapping portions thereof is bent inwardly of the suspension ring. Hanging structure.   The cylindrical body of the length adjusting screw mechanism has a large-diameter cylindrical body whose lower end is fitted around the upper end head of the hanging rod, the upper end is provided with the screw hole portion, and the lower end is located inside the large-diameter cylindrical body. 5. A small-diameter cylindrical body connected by a fixed pin that is fitted and penetrates in a diametrical direction, and a through-lateral hole for rotational operation is provided in the small-diameter cylindrical body protruding from the large-diameter cylindrical body. Or the suspension structure of the suspension scaffold as described in 5.

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