JP2023007329A - Main rope post and clamp reinforcement jig - Google Patents

Abstract

To provide a main rope post and a clamp reinforcement jig which have a clamp mounted on a flange arranged parallel to a vertical plane in a horizontally installed H-steel, are used in the state where a main rope is expanded in a direction parallel or perpendicular to the longitudinal direction of the H-steel, and prevent removal of the clamp from the flange even when a post body is pulled by the main rope due to fall of a worker.SOLUTION: A main rope post 1a includes a clamp 2a which has three sets of fastening bolts and receiving bolts and is opened downward, and a connection fitting 3 which is installed on the upper side of the clamp 2a and is mounted on a lower end 10a of a post body 10. The connection fitting 3 has a substrate which is mounted on the lower end of a square cylindrical body and has substantially a rectangular shape, two support plates which have substantially the same shape in plan view and have upper ends joined to the lower surface of the substrate in the state of being assembled in a cross shape, and a connection plate which has fixed bolt insertion holes at four corners, and has the lower end of the support plat joined to the upper surface and has substantially a rectangular shape.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main rope stanchion for mooring a lifeline of a worker at a site where work is carried out at height, and more particularly to a main rope stanchion and a clamp reinforcing jig having excellent impact resistance.

Temporary scaffolding is often installed at construction sites, construction sites, etc. so that workers can easily move, but when working in high places, the worker's lifeline is moored to this temporary scaffolding. It is obligatory to set up a parent line for
Generally, the struts used to install the master rope on the temporary scaffolding are removed when the prescribed work is completed, so they must have a structure that can be easily removed from the temporary scaffolding. On the other hand, it is necessary that this post is attached to the temporary scaffolding in such a way that it will not come off easily even if a certain amount of load is applied to the master rope.

Regarding the posts for attaching the main rope, for example, Patent Document 1 describes a "handrail device", which includes a plurality of handrail posts attached to the flanges or slabs of steel beams via sandwiching members, and two handrail posts. An invention is disclosed which relates to a device consisting of a main rope strung between handrail posts.
The invention disclosed in Patent Document 1 is a handrail device in which a main rope is stretched between a plurality of handrail posts arranged along an extension direction of a member to be attached, and a connection portion is installed at the lower end of the handrail device. It has a structure in which a reinforcing frame perpendicular to the extension direction of the handrail is installed between the handrail support and the connecting part.

In addition, Patent Document 2 discloses a parapet on a roof (a roof or a roof edge) under the name of "parapet stanchion and temporary fence using the same" for the purpose of ensuring the safety of workers performing construction on the roof of a building. A stanchion (temporary post) installed on a low handrail wall attached) and a fence attached to it are disclosed.
The parapet stanchion disclosed in Patent Document 2 consists of a long strut having a ring at its upper end for locking one end of a master rope or a rope, and a horizontal protrusion protruding substantially horizontally from one side of the lower part of the strut. It has an arm and a vertical arm depending generally parallel to the post and fixedly or slidably attached at its upper end to the horizontally projecting arm. Also, both sides of the first contact seat provided on one end side of the lower part of the column project from the left and right sides of the column so as to face the vertical arm, and the projection length extends from support members provided on both sides of the lower part of the vertical arm. Two adjusting bolts are arranged horizontally so that the can be adjusted freely. Further, a pressure contact plate is provided at the tip of each adjustment bolt so as to face the first contact seat, and the lower surface near the base of the horizontally protruding arm is provided with a second plate protruding from both left and right sides of the horizontally protruding arm. Two abutment seats are provided. Then, with the first contact seat and the second contact seat in contact with the outside and the top of the parapet, each adjustment is made so that the pressure contact plates of the two adjustment bolts arranged side by side come into contact with the inside of the parapet. By adjusting the projecting length of the bolt, the parapet is sandwiched between the first contact seat, the pressure contact plate and the second contact seat.

Furthermore, Patent Document 3 relates to a jig used when attaching a main rope to which a worker's lifeline is moored or a support for installing a handrail to a temporary scaffold or a temporary staircase under the name of "temporary shock absorbing jig". An invention is disclosed.
The invention disclosed in Patent Document 3 includes a clamp for holding a plate material, a connecting fitting attached to the lower end of a support, a male screw provided upright on the upper surface of the clamp, and a second screw attached to the male screw. 1. A temporary shock absorbing jig comprising a nut, wherein the connecting fitting is installed so as to protrude downward from the lower end of the post, and the shaft is made of a rectangular flat plate material provided with a first through hole. A plate, a connecting bolt inserted through a first through hole of the shaft plate, and a second nut attached to the connecting bolt form an L shape in side view and are parallel to the shaft plate. A pair of connection plates having a mounting portion installed and a connection portion installed so as to be orthogonal to the longitudinal direction of the column are provided. In addition, the pair of connecting plates has a connecting portion fixed to the upper surface of the clamp by a male screw and a first nut, and a connecting bolt inserted through the first through hole so as to be perpendicular to the shaft plate. A second through hole is provided in the mounting portion so as to be able to be inserted therethrough. A second nut is attached to a portion of the connecting bolt protruding from the second through hole in a state in which the connecting bolt is inserted through the first through hole of the shaft plate and the second through hole of the pair of connecting plates. It has a structure.

Japanese Patent Application Laid-Open No. 2020-20256 Utility Model Registration No. 3186864 Japanese Patent No. 6584044

In the invention disclosed in Patent Document 1, when a worker falls from a member to be attached such as a steel beam or slab, the main rope is pulled by the weight of the worker, and the tension at that time acts on the main body of the column. In this case, the reinforcing frame installed between the handrail post and the connecting part so as to be perpendicular to the direction in which the main rope is extended acts to increase the bending rigidity of the main body of the post in the direction perpendicular to the direction in which the main rope is extended. However, it does not have the effect of increasing the bending rigidity of the support body in the direction parallel to the extension direction of the master rope. Therefore, when a moment that rotates the main rope in a vertical plane parallel to the extension direction of the main rope is applied to the main body of the support, the stress concentrates on the base end of the main body of the support, and there is a risk of breakage at that point. there were.
The parapet stanchion disclosed in Patent Document 2 has a structure with increased strength against the load in the longitudinal direction of the rosette. Since the force between the seat and the press contact seat is not enough to clamp the parapet, if a moment is generated that causes the column to rotate in the vertical plane parallel to the longitudinal direction of the parapet, the column may come off the parapet. is high.
The invention disclosed in Patent Document 3 is used by attaching it to a horizontally installed H steel flange or the like, but it is assumed that the main rope is extended parallel to the longitudinal direction of the H steel. Because of this structure, when the main rope is extended perpendicular to the longitudinal direction of the H steel, the holding force of the clamp on the plate material is insufficient, and the support body may come off the plate material.

The present invention has been made in response to such conventional circumstances, and a clamp is attached to a flange that is arranged parallel to a vertical plane in the horizontally installed H steel, and the longitudinal direction of the H steel is fixed. A master rope strut and a clamp reinforcement jig that are used with the master rope stretched in a parallel or orthogonal direction, and that prevent the clamp from coming off the flange even when the strut body is pulled by the master rope due to a fall of the worker, etc. intended to provide

In order to achieve the above object, the first invention is a main rope support installed on a plate-shaped member installed in parallel with the vertical direction, the main rope support having a first leg and a second leg facing each other. a clamp body that opens downward through a clamp body; a tightening bolt that is screwed into a tightening bolt hole provided in the first leg; A clamp consisting of a receiving bolt held at the tip of each clamp, a connecting metal fitting installed on the upper side of the clamp, and this connecting metal fitting attached to the lower end so that the longitudinal direction is parallel to the vertical direction. and a strut body, wherein multiple sets of tightening bolts and receiving bolts are installed, and their central axes are parallel to the strut body and within a plurality of virtual planes that are parallel to each other. The clamps are arranged respectively, and the clamps are attached to the plate-like member so that the imaginary plane and the plate-like member are perpendicular to each other.
In addition, when the main rope strut of the present invention is installed on the H steel in which the flange is parallel to the vertical plane and is installed horizontally, the flange is the above-mentioned "plate-shaped member installed parallel to the vertical plane Equivalent to In addition, in the present invention, the "support body installed parallel to the vertical direction" includes "support body installed substantially parallel to the vertical direction", and "a plate-like member installed parallel to the vertical direction". includes "a plate-like member installed substantially parallel to the vertical direction". Furthermore, in the present invention, the state in which the "virtual plane and the plate-like member are orthogonal" includes the state in which the "virtual plane and the plate-like member are substantially perpendicular to each other".

In the main rope strut with the above structure, the clamp is provided with a plurality of sets of tightening bolts and receiving bolts, so that the clamp has a strong holding force. Therefore, in the first invention, there is an effect that the column main body is difficult to come off from the plate-like member. In addition, since some conventional master rope struts are equipped with clamping means equivalent to two sets of tightening bolts and receiving bolts, it is possible that three or more sets of tightening bolts and receiving bolts are installed. desirable.

A second invention is characterized in that, in the first invention, the tightening bolt and the receiving bolt are installed with their central axes tilted with respect to the horizontal direction so that their tip ends face upward. is.
In the main rope strut having the above structure, when the clamp is pulled upward while the plate-like member is sandwiched between the tightening bolt and the receiving bolt, the tightening bolt and the receiving bolt are positioned between the first leg and the second leg. As the contact area between the tip of the tightening bolt and the receiving bolt and the plate-shaped member widens, a large frictional force is generated between them. As a result, the holding force of the clamp increases. Therefore, in the second invention, the effect of the first invention that the support main body is less likely to come off from the plate-like member than in the conventional master rope support is further exhibited.

In a third invention based on the first invention, instead of the receiving bolt, the clamp comprises a receiving side pad, a screw member inserted into a screw insertion hole provided in the receiving side pad, and a screw member through which the screw member is inserted. A washer having a hole and having a wedge shape when viewed from the side is provided, and the second leg is provided with a screw hole into which a screw member is screwed and a concave holding portion in which a part of the washer can be arranged. The outline of the screw insertion hole, when viewed from above, has a shape in which two circles, at least one of which has a larger radius than the shank of the screw member, partially overlap each other. The part where the interval is narrow is narrower than the thickness of the shaft part of the screw member, and the washer is installed in the holding part so that the narrow side faces upward when viewed from the side.
In the main rope strut with the above structure, when the clamp is pulled upward while the plate member is sandwiched between the tightening bolt and the receiving pad, the shaft of the screw member deforms the screw insertion hole of the receiving pad. As a result, the washer functions as a wedge and presses the receiving pad toward the plate-like member. have

In a fourth aspect based on the third aspect, the clamp has a convex portion formed on the surface facing the second leg portion of the receiving side pad instead of the washer, and the convex portion is vertically extended. A guide part for guiding is provided on the second leg, the protrusion has a wedge shape when viewed from the side, and the distance between the bottom surface and the first leg of the guide part narrows toward the tip of the second leg. The receiving side pad is installed so that the narrower side faces downward when the projection is viewed from the side.
In the main rope strut with the above structure, when the clamp is pulled upward while the plate member is sandwiched between the tightening bolt and the receiving pad, the shaft of the screw member deforms the screw insertion hole of the receiving pad. As the second leg moves upward relative to the receiving pad, the second leg presses the receiving pad toward the plate member. have

According to a fifth aspect of the invention, in any one of the first to fourth aspects, the connecting fitting is joined to the lower surface of the substrate at the upper end in a criss-crossed state with the substrate installed at the lower end of the column body. and a connecting plate whose lower surface is connected to the clamp body and whose lower ends are joined to the upper surface. one of the support plates is arranged parallel to the imaginary plane.
In addition, in the present invention, notches are provided in the two support plates, and the notches are used to assemble the two support plates in a cross shape. If the cut piece is joined to the other support plate, and the support plate forms a cross when viewed from the upper or lower end side, it is also included in the above-mentioned "state of being crossed." and In addition, in the present invention, the state in which "one of the two support plates is arranged so as to be parallel to the imaginary plane" includes "a state in which one of the two support plates is substantially parallel to the imaginary plane." The state of "arranged so as to form" is also included.

Two main rope pillars of the above structure are installed on a plate-shaped member such as an H steel flange with a predetermined interval, and the worker's lifeline is moored to the main rope that is stretched between them. When the worker's weight is suddenly applied to the main rope due to, for example, stepping off the main rope, a moment is generated that rotates the support body around the portion where the plate-shaped member is held by the clamp. For example, when the extension direction of the main rope is parallel to the longitudinal direction of the plate-shaped member, the moment (described later with reference to FIG. When the extension direction of the master rope is perpendicular to the longitudinal direction of the plate-like member, the moment (the first moment to rotate the strut main body in the figure 9(b), a second moment) is generated.
In the third invention, since one of the two support plates is arranged parallel to the imaginary plane, the support plate is perpendicular to the longitudinal direction of the plate-like member, and the other support plate is It is parallel to the longitudinal direction of the plate member. In this case, the supporting plate orthogonal to the longitudinal direction of the plate-like member increases the rigidity of the connecting fitting against bending in a vertical plane orthogonal to the plate-like member, and the supporting plate parallel to the longitudinal direction of the plate-like member increases the rigidity of the plate-like member. It acts to stiffen the fitting against bending in a vertical plane parallel to the members. That is, in the third invention, since the rigidity of the connecting fitting against bending in a vertical plane perpendicular to the longitudinal direction of the plate-like member and bending in a vertical plane parallel to the longitudinal direction of the plate-like member is high, In addition to the action of any one of the inventions to the fourth invention, the action that the connecting fittings are hard to break regardless of whether the direction in which the main rope is stretched is perpendicular to or parallel to the plate-like member. have

In a sixth aspect based on the fifth aspect, the clamp body is provided with a fixing bolt hole into which the fixing bolt is screwed on the upper surface, and the connecting plate is provided with a fixing bolt insertion hole through which the fixing bolt is inserted. It is characterized by being
In addition to the effect of the fifth invention, the main rope strut having the structure described above has the effect that the connecting fitting and the clamp are detachably connected by the fixing bolt.

In a seventh invention, in any one of the first invention to the sixth invention, two annular members to which one ends of the main rope are respectively attached form a cross in plan view, and one of them is (a tightening bolt and It is characterized in that it is installed on the upper part of the column body so as to be parallel to the imaginary plane (described above) on which the central axis of the receiving bolt is arranged and the other to be perpendicular to the imaginary plane.
In addition, the "annular member" in the present invention includes a "substantially annular member", such as the case where the part connected to the upper part of the support body forms an annular shape, although it cannot be said that it is a perfect annular member by itself. "Eggplant member" is also included. The state in which "two annular members form a cross when viewed from above" also includes a state where "two annular members form a substantially cross when viewed from above".
In the seventh invention, one of the two annular members is arranged so as to be parallel to the imaginary plane. The other annular member is parallel to the longitudinal direction of the plate member. In this case, in two main rope supports installed on one plate-shaped member, if both ends of the main rope are attached to each ring-shaped member parallel to the longitudinal direction of the plate-shaped member, it will be parallel to the longitudinal direction of the plate-shaped member. The parent rope is extended to form a On the other hand, in two main rope supports installed on two plate-shaped members, if both ends of the main rope are attached to each annular member perpendicular to the longitudinal direction of the plate-shaped members, The parent rope is extended to do so.

An eighth invention is a clamp that opens downward and is provided with a tightening bolt, a connecting fitting that is detachably connected to the upper surface of the clamp, and the connecting fitting that is attached to the lower end and extends parallel to the vertical direction. and a support body to be installed, and a clamp reinforcing jig attached to a main rope support installed on a plate-shaped member installed in parallel with the vertical direction, arranged so as to face each other across a virtual plane of symmetry. A jig clamp body having a first jig leg portion and a second jig leg portion, which opens downward, and a jig screw screwed into a jig tightening bolt hole provided in the first jig leg portion a pair of jig clamps comprising a tightening bolt and a jig receiving bolt that is attached to a second jig leg portion and clamps a plate-shaped member together with the jig tightening bolt at its distal end portions; a connecting member that connects the upper parts together, the pair of jig clamps being arranged on both sides of the tightening bolt when the connecting member is installed on the upper surface of the clamp, and the jig tightening bolt and the jig receiving bolt , the respective center axes are arranged in the same imaginary plane orthogonal to the imaginary plane of symmetry, the connecting member is detachably installed between the clamp and the connecting fitting, and the connecting fitting is connected to the clamp via the connecting member. It is characterized by being
In the present invention, the "support body installed parallel to the vertical direction" includes "support body installed substantially parallel to the vertical direction", and "plate-shaped member installed parallel to the vertical direction". includes "a plate-like member installed substantially parallel to the vertical direction". In the present invention, the state of "virtual plane perpendicular to the virtual plane of symmetry" includes "virtual plane substantially perpendicular to the virtual plane of symmetry".
The clamp reinforcing jig having the above structure has the effect of increasing the holding force with respect to the plate-like member by attaching it to the conventional main rope strut in which the clamp is provided with the tightening bolt.

In a ninth aspect based on the eighth aspect, the jig tightening bolt and the jig receiving bolt are installed in a state in which the central axis is inclined with respect to a direction perpendicular to the virtual plane of symmetry so that the tip faces upward. It is characterized by being
In the clamp reinforcing jig with the above structure, when the jig clamp is pulled upward while the plate-shaped member is sandwiched between the jig tightening bolt and the jig receiving bolt, the jig tightening bolt and the jig receiving bolt will be pulled together. The tips of the jig tightening bolts and the jig receiving bolts are tilted so as to move downward about the portions held by the first jig leg portion and the second jig leg portion, and the tip portions of the jig tightening bolt and the jig receiving bolt and the plate member Since the contact area is widened, a large frictional force is generated between the two, resulting in an increase in the holding force of the jig clamp. Therefore, in the ninth invention, by attaching the clamp to the main rope post provided with the tightening bolt, the effect of the eighth invention that the holding force of the plate-like member is strengthened is further exhibited.

In the first invention, two plate-shaped members such as flanges of H steel are installed at a predetermined interval, and the worker's lifeline is moored to the main rope stretched between them, and the worker moves from the temporary scaffold. Even if the worker's weight is suddenly applied to the main rope due to the foot slipping off, the holding force of the clamp is strong because it is equipped with multiple sets of tightening bolts and receiving bolts, and the main body of the strut is separated from the plate-like member. Because it is hard to come off, it is excellent in safety.

In the second invention, when the clamp is pulled upward while the plate-like member is sandwiched between the tightening bolt and the receiving bolt, the clamping bolt and the receiving bolt increase the contact area between the tip portion and the plate-like member. When the receiving bolt tilts around the portion held by the first leg and the second leg, a large frictional force is generated between them, and as a result, the holding force of the clamp is increased, and the column body is further extended. It becomes difficult to remove from the plate member. Therefore, in the second invention, since the column main body is less likely to come off from the plate-like member, the effect of the first invention of being excellent in safety is exhibited even more.

According to the third invention, since the holding force of the clamp is increased and the support body becomes more difficult to come off from the plate-shaped member, the support body is less likely to come off from the plate-shaped member, and the effect of the first invention is excellent in safety. is further demonstrated.

In the fourth invention, as in the third invention, the holding force of the clamp is increased, making it more difficult for the post main body to come off from the plate member. Therefore, according to the fourth invention, the advantage of the first invention that the strut main body is difficult to come off from the plate-like member and the safety is excellent is further exhibited.

According to the fifth invention, regardless of whether the direction in which the master rope is extended is parallel to the longitudinal direction of the plate-shaped member or the direction in which the master rope is extended is orthogonal to the longitudinal direction of the plate-shaped member, Since the connecting fittings are hard to break, in addition to the effect of any one of the first to fourth inventions, the effect of being able to be used for a long period of time is obtained.

According to the sixth invention, since the clamp is detachably connected to the connecting fitting, in addition to the effect of the third invention, the clamp can be removed from the connecting fitting during transportation or storage. , there is an effect that it is possible to make it less bulky. It is also possible to prepare a plurality of clamps with different numbers of sets of tightening bolts and receiving bolts and different intervals between sets, select an appropriate clamp according to the application, and attach it to the connecting fitting.

According to the seventh invention, in addition to the effect of any one of the first invention to the sixth invention, when the master rope is extended in parallel with the longitudinal direction of the plate-shaped member, There is an effect that it can be used in any case when the master rope is stretched so as to be orthogonal to the longitudinal direction of the.

When the eighth invention is attached to a conventional master rope strut in which a clamp is provided with a tightening bolt, it is possible to strengthen the holding force with respect to the plate-like member and make it difficult for the strut main body to come off from the plate-like member.

When the ninth invention is attached to a conventional main rope strut in which a clamp is provided with a tightening bolt, the clamp is less likely to come off from the plate-shaped member, so safety during use of the main rope strut increases.

1(a) and 1(b) are a front view and a right side view, respectively, showing the appearance of the main rope support according to the first embodiment of the present invention. (a) is a diagram showing a state in which a part of the support body is cut along a plane perpendicular to the paper surface passing through the central axis of the connector in FIG. It is the figure which expanded a part of support|pillar main body. It is a perspective view of the connection metal fitting shown to Fig.1 (a) and FIG.1(b). (a) to (d) are perspective views showing an example of the appearance of a substrate, two supporting plates, and a connecting plate, respectively. (a) and (b) are a perspective view and a plan view of a clamp body, respectively. It is the figure which expanded the clamp in FIG.1(b). (a) is an enlarged view of the clamps and connecting metal fittings in the main rope strut of FIG. (b) and (d) are schematic diagrams showing the force that the clamp receives from the flange in the case of (a) and (c) of the same figure, respectively. (a) and (b) are enlarged views of a clamp and a connecting fitting in the master rope support of FIG. 1(b). (a) and (b) are the figures which showed the state in which the master rope support shown in FIG.1(a) and FIG.1(b) was installed in the flange of H steel. (a) and (b) are respectively a front view and a right side view showing the appearance of a main rope strut according to a second embodiment of the present invention to which a clamp reinforcing jig is attached. 10(a) and 10(b) are enlarged views of a clamp and a connecting fitting in the master rope support shown in FIGS. 10(a) and 10(b). FIG. (a) to (c) are a front view, a left side view and a top view, respectively, of a clamp reinforcing jig according to an embodiment of the present invention. 11(a) and 11(b) are enlarged views of a portion where a clamp reinforcing jig is attached to the clamp in FIGS. 11(a) and 11(b), respectively. (a) and (b) are respectively a front view and a right side view showing the appearance of a main rope support according to a third embodiment of the present invention. (a) and (b) are enlarged views of the clamp in FIGS. 14(a) and 14(b), respectively, and (c) is a cross-sectional view taken along line BB in FIG. 14(a). 15(a) and 15(b) are respectively a plan view and a side view of the receiving pad shown in FIG. 15(b), and FIG. 15(d) is an enlarged view of the clamp body in FIG. 15(c), (e) is a view in the direction of arrow C in FIG. It is a perspective view, and (g) is the figure which showed the state to which the washer was further attached in the same figure (c). 16(a) and 16(c) are diagrams in which the plan view of the receiving pad shown in FIG. It is an enlarged view of the part surrounded by the broken line in FIG.15(c), (d) is the figure which expanded a part of the same figure (b). (a) is a side view showing the appearance of a main rope support according to a fourth embodiment of the present invention, (b) is an enlarged view of a clamp in (a), and (c) is the same. It is sectional drawing corresponded to FIG.15(c) in FIG.(b). 18(a) and 18(b) are respectively a plan view and a side view of the receiving pad shown in FIG. 18(d) is an enlarged view of the clamp body in FIG. 18(c), and (e) is a view in the direction of arrow E in FIG. 18(d). 19(a) and 19(c) are diagrams in which a cross-sectional view of the shaft portion of the countersunk screw shown in FIG. It is an enlarged view of the part surrounded by the broken line in FIG.18(c), (d) is the figure which expanded a part of the same figure (b).

1 to 9, 14 to 20, and 10 to 13, the main rope strut and clamp reinforcing jig of the present invention will be described in detail.
In addition, the main rope post of the present invention is used when installing a main rope for mooring the lifeline of workers at construction sites, construction sites, etc. where work at height is performed, and the clamp of the present invention The reinforcing jig is attached to a conventional main rope support that is used for the same purpose as the main rope support of the present invention. Therefore, in this specification, assuming that the main rope strut of the present invention or the conventional main rope strut is actually attached to a flange of H steel, etc., "upper surface", "lower surface" or "upward" using expressions. That is, the description of "top" or "bottom" means the upper side or the lower side in the vertical direction, respectively.

FIG. 1(a) and FIG. 1(b) are a front view and a right side view, respectively, showing the appearance of a main rope support 1a according to the first embodiment of the present invention. FIG. 2(a) shows a state in which a part of the column main body 10 is cut along a plane that passes through the central axis of the connector 13 in FIG. 1(a) and is perpendicular to the paper surface, and FIG. The state which expanded a part of support|pillar main body 10 in (a) is shown. In addition, in FIG.2(b), illustration of the connection tool 13 shown to Fig.2 (a) is abbreviate|omitted.
As shown in FIGS. 1(a) and 1(b), the master rope support 1a of the present invention is made of a metal member in the shape of a rectangular tube, and is installed parallel to the vertical direction with a support body 10. , a clamp 2a that opens downward and clamps a flange parallel to the vertical direction on a horizontally installed H steel, and a connecting fitting 3 that is installed on the upper side of this clamp 2a and attached to the lower end 10a of the column body 10. It has The strut body 10 has two annular grips 12a and 12b to which one end of a master rope 23 (see FIG. 9(a) or 9(b)) is attached, respectively, forming a substantially cross shape in plan view, and a fastener to be described later. The gripping portion 12a is installed at the upper end 10b so as to be orthogonal to a virtual plane 28a (see FIG. 5(b)) on which the central axes 18b and 19b of the attachment bolt 18 and the receiving bolt 19 are arranged, and is parallel to the virtual plane 28a. and a lower support 11b having a grip 12c provided on a side surface 10c near the lower end 10a and into which the upper support 11a is slidably inserted from above. A coupler 13 is laid across a pair of parallel side surfaces 10c, 10c of the column body 10. As shown in FIG.
In this embodiment, the structure is such that the upper strut 11a is inserted into the lower strut 11b, but the structure may be such that the lower strut 11b is inserted into the upper strut 11a. Moreover, although both the upper strut 11a and the lower strut 11b are cylindrical, it is also possible to make only the inserted one cylindrical and the inserted one solid. Moreover, the gripping portions 12a and 12b are not limited to the structures shown in FIGS. 1(a) and 1(b). It may be formed of a substantially ring-shaped member, as in the case where the portion connected to the upper portion of the main body 10 together forms a ring.

As shown in FIGS. 2(a) and 2(b), the connector 13 has a pair of connecting holes 14a, 14a provided on the side surface of the upper support 11a and a pair of connecting holes provided on the side surface of the lower support 11b. It consists of a screw 13a inserted through 14b, 14b and a nut 13b attached to the tip of the screw 13a protruding from the side surface 10c of the column body 10. As shown in FIG.
The connecting fitting 3 (see FIG. 1(a) or FIG. 1(b)) includes a metal rectangular tube 4 inserted from the lower end 10a of the column main body 10 into the upper column 11a. A pair of parallel side surfaces 4a, 4a of the body 4 are provided with a pair of connecting holes 14a, 14a of the upper strut 11a and a pair of connecting holes 14b, 14b of the lower strut 11b, and a pair of connecting holes 4b through which screws 13a can be inserted. , 4b are provided.
As shown in FIG. 2(a), the rectangular tube 4 of the connecting fitting 3 (see FIG. 1(a) or FIG. 1(b)) to which the clamp 2a is connected extends from the lower end 10a of the column main body 10 to the inside of the upper column 11a. screw of the connector 13 into the pair of connecting holes 14a, 14a of the upper strut 11a, the pair of connecting holes 14b, 14b of the lower supporting strut 11b, and the pair of connecting holes 4b, 4b of the square cylinder 4. The clamp 2a and the connecting fitting 3 cannot be separated from the support body 10 when the support 13a is inserted.
On the other hand, as shown in FIG. 2(b), the screw 13a is inserted into the pair of connecting holes 14a, 14a of the upper strut 11a, the pair of connecting holes 14b, 14b of the lower strut 11b, and the connecting holes 4b, 4b of the square cylinder 4. The clamp 2a and the connecting fitting 3 can be separated from the column main body 10 when they are not inserted.

In this way, the main rope support 1a has a structure in which the clamp 2a and the connecting fitting 3 are detachably attached to the support body 10. As shown in FIG. That is, the main rope support 1a is easy to handle because the clamp 2a and the connecting fittings 3 can be easily connected to the support main body 10 simply by inserting the rectangular tube 4 into the lower end 10a of the support main body 10. If the column body 10 has a solid structure, it is only necessary to provide an opening at the lower end 10a so that the square tubular body 4 can be inserted. In this case, there is an advantage that the processing cost of the support body 10 can be kept low.
In addition, when transporting or storing the main rope post 1a, the clamp 2a and the connecting fitting 3 can be removed from the post main body 10 to make it less bulky. Furthermore, in the master rope support 1a, if the clamp 2a or the connecting metal fitting 3 is damaged, it can be removed from the support main body 10, so that the clamp 2a and the connecting metal fitting 3 can be easily replaced. In addition, when the support body 10 is damaged, the clamp 2a and the connection metal fitting 3 can be reused by removing the clamp 2a and the connection metal fitting 3 from the support body 10 and replacing them with another support body 10. is.

3 is a perspective view of the connecting fitting 3, and FIGS. 4(a) to 4(d) are perspective views showing the appearance of the substrate 5, the two supporting plates 6 and 7, and the connecting plate 8, respectively.
As shown in FIGS. 3 and 4, the connecting fitting 3 has the rectangular tube 4 already described with reference to FIG. 11a and the lower support 11b to be connected to the lower end 10a of the support body 10 to form substantially the same shape in a plan view as the substantially rectangular substrate 5 installed at the lower end 10a of the support main body 10; Two support plates 6 and 7 whose 6a and 7a are joined to the lower surface 5b of the substrate 5 and fixing bolt insertion holes 8a at the four corners, respectively, and the lower ends 6b and 7b of the support plates 6 and 7 are joined to the upper surface 8b. A substantially rectangular connecting plate 8 is provided. When the clamp 2a is attached to a plate-like member such as an H steel flange while the connecting fitting 3 is attached to the column body 10, one of the two support plates 6 and 7 is parallel to the plate-like member. are arranged to form
The support plates 6 and 7 have a shape in which both sides of the lower side of an isosceles trapezoid are cut symmetrically about the axis of symmetry when viewed from above. A notch 6c is provided in parallel, and a notch 7c is formed in the support plate 7 from the upper end 7a toward the lower end 7b in parallel with the axis of symmetry. The notches 6c and 7c are formed symmetrically about the axis of symmetry, and the sum of their lengths is equal to the distance from the upper end 6a to the lower end 6b and from the upper end 7a to the lower end 7b.
In this embodiment, the support plates 6 and 7 are arranged in a cross shape using the cutouts 6c and 7c. By cutting in two at the position of the axis of symmetry and joining the two cut pieces generated by cutting the support plate to the position of the central axis of the other support plate, It can also be a structure that forms a cross when viewed.

5(a) and 5(b) are a perspective view and a plan view of the clamp body 15, respectively, and FIG. 6 is an enlarged view of the clamp 2a in FIG. 1(b). In addition, in FIG.5(b), the virtual plane 28a is shown with the dashed-dotted line. In FIG. 6, the square cylinder 4, the substrate 5, the support plates 6 and 7, the central shafts 18b and 19b, the connecting plate 8, and the H steel flange 22a, which constitute the connecting fitting 3, are indicated by dashed lines.
As shown in FIGS. 5A and 5B, the clamp body 15 has three first legs 20 and three second legs 21 facing each other. is provided with four fixing bolt holes 16a each having a female threaded portion formed on the inner peripheral surface thereof to be screwed into the male threaded portion of a fixing bolt 17 (see FIG. 6). In addition, the first leg 20 and the second leg 21 have internal female threaded portions that are screwed into the male threaded portions of the tightening bolt 18 (see FIG. 6) and the receiving bolt 19 (see FIG. 6), respectively. A tightening bolt hole 16b and a receiving bolt hole 16c are formed in the peripheral surface.
In this embodiment, each of the three first leg portions 20 and the three second leg portions 21 provided on the clamp body 15 is provided with the tightening bolt hole 16b and the receiving bolt hole 16c. Instead of dividing the first leg 20 and the second leg 21 into three as shown in FIG. A structure in which one tightening bolt hole 16b is provided and three receiving bolt holes 16c are provided in one second leg portion 21 may be employed.

As shown in FIG. 6, the fixing bolt 17 inserted into the fixing bolt insertion hole 8a of the connecting plate 8 with the flat washer 9a inserted is inserted into the fixing bolt 17 with the spring washer 9b and the plain washer 9a further inserted. It is screwed into the fixing bolt hole 16a of the clamp body 15 (see FIGS. 5(a) and 5(b)). That is, the connecting fitting 3 includes a fixing bolt 17 inserted through the bolt insertion hole 8a of the connecting plate 8 and screwed into the fixing bolt hole 16a of the clamp body 15 (see FIGS. 5A and 5B). is fixed to the clamp 2a by tightening the .
As described above, since the clamp 2a is detachably connected to the connecting metal fitting 3 in the master rope post 1a, the clamp 2a can be removed from the connecting metal fitting 3 when transporting or storing, thereby reducing the bulk. can be left without. In addition, a plurality of clamps are prepared in which the number of sets of the tightening bolts 18 and the receiving bolts 19 and the intervals between the sets are different from those of the clamp 2a. can also
The clamp body 15 has a tightening bolt hole 16b (see FIG. 5(a)), a receiving bolt hole 16c (see FIG. 5(a)), and a fixing bolt hole 16a (see FIGS. 5(a) and 5(b)). ), a high-tension bolt is used for the tightening bolt 18, the receiving bolt 19, and the fixing bolt 17, which are screwed into the respective parts. Pads 18a and 19a, which are circular in plan view, are attached to the distal ends of the tightening bolt 18 and the receiving bolt 19, respectively. That is, the clamp 2a has a structure in which an H steel flange 22a is clamped by pads 18a and 19a attached to the ends of three sets of tightening bolts 18 and receiving bolts 19, respectively.
Furthermore, the tightening bolt 18 and the receiving bolt 19 are parallel to the column body 10 installed in parallel with the vertical direction, and are the same bolts that are perpendicular to the plate-like member when the clamp 2a is attached to the plate-like member. center axes 18b and 19b are arranged in a virtual plane 28a (see FIG. 5(b)). The center shafts 18b and 19b are inclined with respect to the direction perpendicular to the flange 22a (horizontal direction) so that the tips of the tightening bolts 18 and the receiving bolts 19 face upward. The three sets of tightening bolts 18 and receiving bolts 19 are installed such that three imaginary planes 28a (see FIG. 5(b)) on which the central axes 18b and 19b are respectively arranged are parallel to each other.

Fig. 7(a) shows a state in which the clamp 2a and the connecting fitting 3 are enlarged in the master rope support 1a of Fig. 1(a), and Fig. 7(c) shows a state in which the clamp 2a is tightened more than the clamp 2a of Fig. 7(a). The clamp 2b is shown with one less set of bolts 18 and receiving bolts 19 (see FIG. 6). 7(b) and 7(d) schematically show the forces that the clamps 2a and 2b receive from the flange 22a in the cases of FIGS. 7(a) and 7(c), respectively.
7(a) and 7(c), the H-steel flange 22a is indicated by a broken line, and in FIGS. 7(b) and 7(d), the H-steel flange 22a is indicated by a solid line. 7(b) and 7(d), the locations (P1 to P5) where the flange 22a is held between the tightening bolts 18 and the receiving bolts 19 (see FIG. 6) are indicated by dashed circles. The solid line shows the line connecting the centers of

As shown in FIG. 7(a), when the support main body 10 is pulled in the left direction with respect to the paper surface by the master rope in a state where the flange 22a of the H steel is clamped by the clamp 2a of the master rope strut 1a, the clamp At 2a, an upward pulling force and a rotating moment in the direction indicated by the arrow A are generated.
When an upward pulling force is applied to the clamp 2a, a downward frictional force is generated between the clamp 2a and the flange 22a. At this time, if the magnitude of the frictional force generated by one set of the tightening bolt 18 and the receiving bolt 19 (see FIG. 6) is F, three sets of the tightening bolt 18 and the receiving bolt 19 (see FIG. 6) are attached to the clamp 2a. ) is provided, as shown in FIG. 7(b), a downward frictional force of magnitude F is generated at P1 to P3, respectively. Frictional force acts.
On the other hand, when the clamp 2b is provided with two sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6) as shown in FIG. 7(c), at P4 and P5 as shown in FIG. 7(d) Since a downward frictional force of magnitude F is generated respectively, a downward frictional force of magnitude 2F acts on the clamp 2b as a whole.
That is, in the clamp 2a provided with three sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6), when an upward force is applied, two sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6) ) is applied to the clamp 2b.
While the main rope strut 1a is provided with three sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6) on the clamp 2a, the conventional main rope strut usually has one or two sets. A clamping means corresponding to the tightening bolt 18 and the receiving bolt 19 (see FIG. 6) is provided. Therefore, the main rope support 1a generates a greater frictional force between the flange 22a and the clamp 2a than the frictional force generated in a conventional main rope support having such a structure. That is, since the main rope support 1a has a stronger holding force for the clamp 2a than the conventional main rope support, the support main body 10 is less likely to come off from the plate member than the conventional main rope support. Therefore, the main rope support 1a of the present invention is excellent in safety.

When a moment that rotates the clamp 2a shown in FIG. 7(a) in the direction indicated by the arrow A is applied, the tightening bolt 18 and the receiving bolt 19 (see FIG. 6) are arranged at P2 and P3 so as to cancel the moment. ) and the flange 22a creates a moment that tends to rotate the clamp 2a in the direction opposite to arrow A about the center of P1. Assuming that the magnitude of this moment is M1 and the distances between P1P2 and P2P3 are L1/2 as shown in FIG.
On the other hand, when a moment is applied to the clamp 2b shown in FIG. ) and the flange 22a generates a moment that tends to rotate the clamp 2b in the direction opposite to the arrow A around the center of P4. Assuming that the magnitude of this moment is M2 and the distance between P4 and P5 is L2 as shown in FIG. 7(d), M2 is expressed by Equation (2).

Since the clamp 2a shown in FIG. 7(a) has one more tightening bolt 18 and receiving bolt 19 (see FIG. 6) than the clamp 2b shown in FIG. 7(c), the distance L1 between P1 and P3 is generally It becomes longer than the distance L2 between P4 and P5. In this case, L1>L2. Applying this magnitude relationship to equations (1) and (2), it can be seen that M1>M2 holds.
That is, in the clamp 2a provided with three sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6), when a moment to rotate the clamp 2a in the direction indicated by the arrow A is applied, it is is larger than the moment generated in the clamp 2b provided with two sets of tightening bolts 18 and receiving bolts 19 (see FIG. 6). Therefore, compared to the conventional master rope strut 1a, which has two sets of clamping means corresponding to the tightening bolt 18 and the receiving bolt 19 (see FIG. 6), the master rope strut 1a is attached to the clamp 2a by the arrow A. When a moment to rotate in the indicated direction is applied, a large moment is generated to cancel it, so that the strut body 10 is less likely to come off from the flange 22a than the conventional master rope strut. As a result, the above-mentioned effect of the main rope strut 1a, which is excellent in safety, is further exhibited.
In this embodiment, the case where a moment to rotate the clamp 2a in the direction indicated by the arrow A (see FIG. 7A) is applied, but the clamp 2a is rotated in the direction opposite to the direction of the arrow A. Even if a moment that rotates to the right is applied, the effect of the main rope support 1a is to generate a moment larger than that of the conventional main rope support so as to cancel it.

Fig. 8(a) shows an enlarged view of the clamp 2a and the connecting fitting 3 in the main rope support 1a of Fig. 1(b), and Fig. 8(b) shows the clamp 2a in Fig. 8(a). shows a state of being pulled upward by 8(a) and 8(b), the H-steel flange 22a is indicated by a dashed line.
As shown in FIG. 8(a), when the clamp 2a is pulled upward with the flange 22a of the H steel clamped by the tightening bolt 18 and the receiving bolt 19, the first clamp 2a is held so that the tip faces upward. The tightening bolt 18 and the receiving bolt 19 attached to the leg 20 and the second leg 21, respectively, are shown by an arrow B centering on the portion held by the first leg 20 and the second leg 21. Tilt as shown. As a result, as shown in FIG. 8(b), the contact area of the pads 18a and 19a with the flange 22a increases, and a large frictional force is generated between the tightening bolt 18/receiving bolt 19 and the flange 22a. strengthens the holding power of Therefore, in the main rope support 1a, compared with the conventional main rope support, the above-mentioned effect that the main rope main body 10 is less likely to come off from the flange 22a and the above-described effect of being excellent in safety are further exhibited.

9(a) and 9(b) show the state of the two main rope supports 1a, 1a installed on the flange 22a of the H steel 22. FIG. However, FIG. 9(a) shows a case where the direction of extension of the master rope 23 is parallel to the longitudinal direction of the H steel 22, and FIG. It represents the case of orthogonality.
As shown in FIG. 9(a), two master rope supports 1a, 1a are installed on the flange 22a of the H steel 22, and the master rope 23 is attached to the pair of grips 12a, 12a parallel to the longitudinal direction of the flange 22a. , respectively, the main rope 23 is extended so as to be parallel to the longitudinal direction of the flange 22a. On the other hand, as shown in FIG. 9B, two H steels 22, 22 are parallel to each other, and each flange 22a is horizontally installed so that it is parallel to the vertical plane. When both ends of the main rope 23 are attached to a pair of gripping portions 12b, 12b that are perpendicular to the longitudinal direction of the flange 22a on the main rope supports 1a, 1a installed in 22, the main rope is attached so that the main rope is perpendicular to the longitudinal direction of the flange 22a. 23 is expanded. That is, since the main rope post 1a has a gripping portion 12a orthogonal to the virtual plane 28a and a gripping portion 12b parallel to the virtual plane 28a, the main rope 23 is held parallel to the longitudinal direction of the flange 22a. It can be used in both the case of stretching and the case of stretching the main rope 23 so as to be perpendicular to the longitudinal direction of the flange 22a.
As shown in FIG. 9(a), a worker walking on the H steel 22 with the lifeline moored to the main rope 23 stretched between the two main rope supports 1a, 1a loses his foot. Then, when it falls from the H steel 22, the operator's weight is suddenly added to the master rope 23. As a result, the strut body 10 is pulled by the main rope 23, thereby generating a moment that rotates the strut body 10 around the portion where the flange 22a is held by the clamp 2a.

When two master rope struts 1a, 1a are installed with a predetermined interval from the flange 22a of one H steel 22, the extension direction of the master rope 23 is the longitudinal direction of the H steel 22. become parallel. In this case, a moment (hereinafter referred to as a first moment) is generated in a vertical plane parallel to the flange 22a to rotate the column body 10 as indicated by an arrow C in FIG. 9(a). As already described, in the main rope support 1a, two support plates 6, 7 are arranged parallel to the virtual plane 28a (see FIG. 5(b)) parallel to the support main body 10 installed parallel to the vertical direction. (see FIG. 6) are arranged, and the other of the support plates 6 and 7 (see FIG. 6) is arranged so as to be orthogonal to the imaginary plane 28a (see FIG. 5(b)). . When the clamp 2a is installed on the flange 22a, the virtual plane 28a (see FIG. 5(b)) and the flange 22a are perpendicular to each other. (b)) is perpendicular to the support plate, which is parallel to the flange 22a. Of the support plates 6 and 7 (see FIG. 6), the support plate parallel to the flange 22a acts to increase the rigidity of the connecting fitting 3 against bending in the vertical plane parallel to the flange 22a. Therefore, the main rope support 1a is installed on the H steel 22 so that the extension direction of the main rope 23 is parallel to the flange 22a as shown in FIG. Even when the first moment to cause the connecting metal fitting 3 is generated, the connecting metal fitting 3 has a high rigidity against bending in the vertical plane on which the first moment acts, so that the connecting metal fitting 3 is less likely to be damaged.

As shown in FIG. 9(b), when the master rope 23 is stretched between the two master rope supports 1a, 1a, the direction in which the master rope 23 is stretched is parallel to the longitudinal direction of the H steel 22. In this case, a moment (hereinafter referred to as a second moment) is generated to rotate the column body 10 as indicated by an arrow D in a vertical plane perpendicular to the flange 22a. As already described, in the master rope support 1a, when the clamp 2a is installed on the flange 22a, one of the support plates 6 and 7 becomes parallel to the aforementioned imaginary plane 28a (see FIG. 5(b)). Therefore, it is perpendicular to the flange 22a. Of the support plates 6 and 7, the support plate perpendicular to the flange 22a acts to increase the rigidity of the connecting fitting 3 against bending in the vertical plane perpendicular to the flange 22a. Therefore, as shown in FIG. 9B, the main rope support 1a is installed on the H steel 22 so that the extension direction of the main rope 23 is perpendicular to the flange 22a, and the support main body 10 is rotated as shown by the arrow D. Even if a second moment is generated, the connecting metal fitting 3 has a high rigidity against bending in the vertical plane on which the second moment acts, so that the connecting metal fitting 3 is less likely to be damaged.
In this way, the master rope strut 1a is either when the extension direction of the master rope 23 is parallel to the flange 22a of the H steel 22 or when the extension direction of the master rope 23 is orthogonal to the flange 22a of the H steel 22. , since the connecting metal fittings 3 are hard to be damaged, they can be used for a long period of time. In the present embodiment, the same connecting fittings 3 as the main rope struts 1a are used for the main rope struts 1b. The above-described actions and effects of the master rope strut 1a are similarly exhibited.

10(a) and 10(b) are respectively a front view and a left side view showing the appearance of the main rope support 1b to which the clamp reinforcing jig 24 according to the second embodiment of the present invention is attached. 11(a) and 11(b) are enlarged views of the clamp 2c and the connecting fitting 3 in the master rope support 1b shown in FIGS. 10(a) and 10(b), and FIG. 12(a) 12(c) are a front view, a left side view and a top view of the clamp reinforcing jig 24, respectively. Further, FIGS. 13(a) and 13(b) are enlarged views of a portion where the clamp reinforcing jig 24 is attached to the clamp 2c in FIGS. 11(a) and 11(b), respectively. It should be noted that illustration of the jig fastening bolt 32 and the jig receiving bolt 33 is omitted in FIG. 12(c).
As shown in FIGS. 10(a) and 10(b) and FIGS. 11(a) and 11(b), the main rope support 1b is the main rope support shown in FIGS. 1(a) and 1(b). Instead of the clamp 2a, the structure 1a is provided with a clamp 2c having two sets of tightening bolts 18 (see FIG. 11(b)). That is, the main rope support 1b has a downward opening, a clamp 2c provided with two tightening bolts 18 (see FIG. 11(b)), and a clamp body 25 (see FIG. 11(a)) constituting the clamp 2c. ) and FIG. 11(b)), and the connecting metal fitting 3 is detachably connected to the upper surface 25a (see FIGS. 11(a) and 11(b)), and the connecting metal fitting 3 is attached to the lower end 10a and vertically It has a column body 10 installed parallel to the direction, and is used in a state of being installed on a plate-like member installed parallel to the vertical direction, such as a flange of H steel.
As shown in FIGS. 11(a) and 11(b), the clamp 2c is provided with two first legs 26 and two second legs 27 facing each other, and a fixing bolt is attached to the upper surface 25a. 17 (see FIG. 6). A clamp body 25 provided with four fixing bolt holes (not shown) having a female thread formed on the inner peripheral surface to be screwed to the male thread 17 (see FIG. 6), and a first leg 26 It has a tightening bolt 18 which is screwed into a tightening bolt hole (not shown) provided in the body and has a pad 18a attached to its tip. In this embodiment, the same connecting fittings 3 as the main rope struts 1a are used for the main rope struts 1b, and the clamps 2c are used. The action and effect of the clamp reinforcing jig 24, which will be described below, are also exhibited in the same way when it is used or when the master rope strut 1b is provided with the clamp 2b instead of the clamp 2c.

As shown in FIGS. 12(a) to 12(c), the clamp reinforcing jig 24 comprises a pair of jig clamps 29, 29 and two connecting pieces 30a, 30a. A connecting member 30 connecting the upper parts is provided. The jig clamp 29 is composed of a jig clamp body 31, a jig tightening bolt 32 and a jig receiving bolt 33. The jig clamp body 31 has a virtual plane of symmetry 28c (see FIGS. 12(b) and 12(c)). It has a first jig leg portion 34 and a second jig leg portion 35 that are arranged to face each other with the gap between them, and has a downward opening structure. The jig tightening bolt 32 is screwed into a jig tightening bolt hole (not shown) provided in the first jig leg 34 , and the jig receiving bolt 33 is screwed into the second jig leg 35 . is attached to the The jig tightening bolt 32 and the jig receiving bolt 33 have pads 32a and 33a, which are circular in plan view, attached to their distal ends, respectively. That is, the jig tightening bolt 32 and the jig receiving bolt 33 of the jig clamp 29 have a structure in which a plate member such as an H-steel flange is sandwiched by pads 32a and 33a at the tip.
The jig tightening bolts 32 and the jig receiving bolts 33 are arranged so that they are perpendicular to the imaginary plane of symmetry 28c (see FIGS. 12(b) and 12(c)) and the column body 10 is parallel to the vertical direction. Central axes 32b, 33b (see FIG. 12(b)) in a virtual plane 28b (see FIG. 12(a)) parallel to the vertical direction when the clamp reinforcing jig 24 is attached to the main rope support 1b installed in the ) are placed. The central axes 32b and 33b are inclined with respect to the direction orthogonal to the imaginary plane of symmetry 28c so that the distal ends of the jig tightening bolt 32 and the jig receiving bolt 33 face upward.

The connecting piece 30a has a rectangular shape in plan view, and a flat portion and a bent portion are formed by bending one side of the rectangle at a substantially right angle. However, the bent portion is formed at a location that does not hinder the installation of the flat portion on the upper surface 25 a of the clamp body 25 . The flat portion is provided with two fixing bolt insertion holes 36 for inserting the fixing bolts 17 inserted in the fixing bolt insertion holes 8 a of the connecting plate 8 . That is, four fixing bolt insertion holes 36 are provided in the connecting member 30 consisting of two connecting pieces 30a, 30a. The four fixing bolt insertion holes 36 are formed by the four fixing bolt holes (not shown) of the clamp body 25 when the flat portions of the two connecting pieces 30a, 30a are installed on the upper surface 25a of the clamp body 25. ) is provided at a location where the four fixing bolts 17 screwed into it can be inserted at the same time. As a result, the connecting member 30 can be fixed to the upper surface 25a of the clamp body 25 using four fixing bolts 17 while being installed between the clamp 2c of the main rope support 1b and the connecting fitting 3. As shown in FIG. 13(a) and 13(b), a connecting member 30 is detachably installed between the clamp 2c and the connecting fitting 3, and the clamp reinforcing jig 24 is connected via the connecting member 30. It has a structure in which the fitting 3 is connected to the clamp 2c.

When the clamp reinforcing jig 24 is attached to the master rope pillar 1b by installing the connecting member 30 between the clamp 2c and the connecting fitting 3 as shown in FIGS. 13(a) and 13(b), A pair of jig clamps 29, 29 are arranged on both sides of the two tightening bolts 18, 18, respectively.
In this state, when the main rope support 1b to which the clamp reinforcing jig 24 is attached is installed on a plate-shaped member such as an H steel flange, in addition to the two tightening bolts 18 of the clamp 2c, two sets of jigs Since the plate-like member is clamped by the tightening bolts 32 and the jig receiving bolts 33, the force for holding the plate-like member is increased. Therefore, by attaching the clamp reinforcing jig 24 to the main rope support 1b, the support main body 10 can be made difficult to come off from the plate member.
Further, when the jig clamp 29 is pulled upward while the plate-like member is clamped by the jig tightening bolt 32 and the jig receiving bolt 33, the jig tightening bolt 32 and the jig receiving bolt 33 are pulled to the first position. tilts so that the tip portion moves downward around the portion held by the jig leg portion 34 and the second jig leg portion 35, and is attached to the tip portions of the jig tightening bolt 32 and the jig receiving bolt 33. Since the contact area between the pads 32a and 33a and the plate-shaped member is widened, a large frictional force is generated between them. As a result, the holding force of the jig clamp 29 is increased. As a result, the force for holding the plate-shaped member is further strengthened, and the clamp 2c is more difficult to come off from the plate-shaped member.
That is, by using the clamp reinforcing jig of the present invention for a conventional main rope post installed on a plate-like member, the clamp on the main rope post becomes difficult to come off from the plate-like member, so when using the main rope post It is possible to increase safety.

14(a) and 14(b) are respectively a front view and a right side view showing the appearance of a main rope support 1c according to a third embodiment of the present invention. FIGS. 15(a) and 15(b) are enlarged views of the clamps in FIGS. 14(a) and 14(b), respectively, and FIG. 15(c) is a view taken along line BB in FIG. It is a sectional view. 16(a) and 16(b) are respectively a plan view and a side view of the receiving pad shown in FIG. 15(b), and FIG. It is the figure which showed the state in which the countersunk screw was attached to. Furthermore, FIG.16(d) is an enlarged view of the clamp main body in FIG.15(c), and FIG.16(e) is a C direction arrow directional view of FIG.16(d). FIG. 16(f) is an external perspective view of the washer, and FIG. 16(g) shows a state in which the washer is further attached in FIG. 16(c). 17(a) and 17(c) are diagrams in which a cross-sectional view of the shaft portion of the countersunk screw shown in FIG. 16(c) is added to the plan view of the receiving pad shown in FIG. 16(a). 17(b) is an enlarged view of the portion surrounded by the dashed line in FIG. 15(c), and 17(d) is a partially enlarged view of FIG. 17(b). 15(c), 17(b), and 17(d), the tightening bolt 18, the pad 18a, the countersunk screw 37, and the receiving pad 38 are not shown in cross section, but shown in external view. 1 to 9 are given the same reference numerals, and description thereof will be omitted as appropriate.

As shown in FIGS. 14(a) and 14(b), the main rope support 1c of the present invention is characterized by having a clamp 2d instead of the clamp 2a in the main rope support 1a already described as the first embodiment. there is The connection fitting 3 of the main rope support 1c has a shape when the support plates 6 and 7 (see FIGS. 4(a) and 4(b)) are viewed from above. , but the rest of the structure is the same as that of the connecting fitting 3 of the main rope support 1a. The gripping portions 12a and 12b of the main rope support 1c are also slightly different in shape from the gripping portions 12a and 12b of the main rope support 1a in plan view, but the gripping portions of the main rope support 1a are otherwise Same as 12a and 12b.

As shown in FIG. 15(a), in the clamp 2d, when viewed from the front, among the three first legs 20, the distance between the two distal ends on both sides is wider than the distance between the proximal ends. It has a shape that looks like Although not shown, when the second leg 21 is viewed from the front, two of the three legs are arranged such that the distance between the distal ends is wider than the distance between the proximal ends. It has a shape.
As shown in FIGS. 15(b) and 15(c), the clamp 2d is provided with a receiving bolt hole 16c (see FIG. 5(a)) in the second leg 21 of the clamp body 15 in the clamp 2a. A screw hole 16d and a concave holding portion 16e (both see FIG. 16(d)) are provided, and countersunk screws 37, receiving pads 38 and washers 39 are provided instead of receiving bolts 19 and pads 19a. .

As shown in FIGS. 16(a) to 16(c), the receiving pad 38 is cut by a plane parallel to the plane passing through the center of the sphere (hereinafter referred to as a first cutting plane). The part on the side that includes the center of the cut surface) is excised, and a part of the convex outer surface side (the part on the side that does not include the cut surface by the first cutting plane) is a predetermined portion with respect to the first cutting plane The shape is further cut by a second cutting plane forming an angle (eg, 5 degrees). Further, the receiving pad 38 is provided with a screw insertion hole 38a through which the shaft portion 37b of the countersunk screw 37 is inserted. It has a shape in which two circles, each of which can be inserted, partially overlap each other. The countersunk screw 37 has a structure in which the head portion 37a is arranged inside the receiving side pad 38 while the shaft portion 37b is inserted into the screw insertion hole 38a. Further, the screw insertion hole 38a may have a structure in which the shaft portion 37b of the countersunk screw 37 can be inserted only inside the lower arc shown in FIG. 19(a) when viewed from above.

As shown in FIG. 16(d), when the countersunk screw 37 is screwed into the screw hole 16d, the central axis 37c and the central axis 18b of the tightening bolt 18 are aligned on the virtual plane 28a (see FIG. 5(b)). It is provided on the inner surface 21a of the second leg 21 of the clamp body 15 so as to be parallel to the horizontal direction when the column body 10 is parallel to the vertical direction. Although the screw hole 16d is a bottomed hole in this embodiment, the screw hole 16d is not limited to such a structure, and may be a through hole. Also, although the countersunk screw 37 is used in this embodiment, a screw member other than the countersunk screw can also be used as long as it has a structure having a head portion and a shaft portion.
As shown in FIG. 16(e), on the inner surface 21a of the second leg portion 21 of the clamp body 15, a holding portion 16e having a rectangular shape in a plan view and a predetermined depth is provided to partially hold the washer 39 inside. It is arranged so that it can be arranged. Further, as shown in FIG. 16(f), the washer 39 has a rectangular shape in plan view, and the first contact surface 39a and the second contact surface 39b are not parallel (that is, the first contact surface 39a is included). with the plane containing the plane and the second contact surface 39b arranged at the same angle as the angle they make to the first cutting plane and the second cutting plane), the first contact surface 39a and An insertion hole 39c for the countersunk screw 37 is provided approximately in the center of the second contact surface. That is, the washer 39 has a wedge shape when viewed from the side.
As shown in FIG. 16(g), the washer 39 has an insertion hole 39c into which the shaft portion 37b of the countersunk screw 37 is inserted, and a contact surface 38b of the receiving pad 38 (which is cut along the above-described second cutting plane). equivalent) (see FIGS. 16(b) and 16(c)) so that the first contact surface 39a is in a contactable state and the narrower side faces upward when viewed from the side. is installed in the holding portion 16e.

As shown in FIG. 17(a), the outline of the screw insertion hole 38a of the receiving pad 38 in plan view is formed by two circular arcs, at least one of which has a larger radius than the shaft portion 37b of the countersunk screw 37. However, the distance between the connecting portions (that is, the portion where the distance is the narrowest) between the two arcs is narrower than the thickness of the shaft portion 37b of the countersunk screw 37 . The contact surface 38b of the receiving pad 38 has a rectangular shape in plan view, and two of the four sides forming the rectangle are formed so as to be parallel to the line segment connecting the centers of the arcs. there is
One of the two arcs forming the contour line when the screw insertion hole 38a of the receiving pad 38 is viewed from above has its center passing through the central axis of the receiving pad 38 (passing through the center of the sphere described above) and straight line perpendicular to the first cutting plane). Therefore, when the shaft portion 37b is inserted into the screw insertion hole 38a of the receiving pad 38 so that the central axis 37c of the countersunk screw 37 coincides with the central axis of the receiving pad 38, as shown in FIG. A shaft portion 37b of the countersunk screw 37 is arranged within the one arc.

When the H-steel flange 22a is clamped by the clamp 2d configured as described above, the contact surface 38c of the receiving pad 38 (corresponding to the cut surface by the above-described first cut plane) (Fig. 16 ( b) and FIG. 16(c)) abut the side of the flange 22a. In this state, when the support main body 10 (see FIGS. 14(a) and 14(b)) of the main rope support 1c is pulled by the main rope in either the left or right direction with respect to the paper surface, the three At least one of the two legs 21 generates a force that tends to move it upward as indicated by an arrow D. FIG. At this time, the countersunk screw 37 has its shaft portion 37b screwed into the screw hole 16d (see FIGS. 16(d) and 16(e)) provided in the second leg portion 21, and the washer 39 16(d) and 16(e)) provided on the leg 21 of the second leg 21, the countersunk screw 37 and the washer 39 are held by the second leg An upward force acts from 21 . On the other hand, the frictional force generated between the contact surface 38c and the side surface of the flange 22a acts downward on the receiving pad 38. As shown in FIG. As a result, as shown in FIGS. 17(c) and 17(d), the shaft portion 37b of the countersunk screw 37 deforms the screw insertion hole 38a of the receiving pad 38 and moves upward therein. The washer 39 with the shaft portion 37b of the countersunk screw 37 inserted into the insertion hole 39c also moves upward together with the countersunk screw 37 and the second leg portion 21 .
When the washer 39 moves upward relative to the receiving pad 38 in this way, the receiving pad 38 whose contact surface 38b is in contact with the first contact surface 39a functions as a wedge. As a result, a force is applied from the washer 39 to push it toward the flange 22a. As a result, the holding force of the clamp 2d is strengthened, so that in the main rope support 1c, the effect that the support main body 10 is less likely to come off from the flange 22a and the effect of being superior in safety can be exhibited more effectively than in the main rope support 1a.

FIG. 18(a) is a side view showing the appearance of a main rope support post according to a fourth embodiment of the present invention, and FIG. 18(b) is an enlarged view of a clamp in FIG. 18(a). 18(c) is a sectional view of FIG. 18(b) and corresponds to FIG. 15(c) of the third embodiment. 19(a) and 19(b) are respectively a plan view and a side view of the receiving pad shown in FIG. 18(b), and FIG. 19(d) is an enlarged view of the clamp main body in FIG. 18(c), and FIG. 19(e) is an E direction arrow in FIG. 19(d). It is a perspective view. Further, FIGS. 20(a) and 20(c) are diagrams in which a cross-sectional view of the shaft portion of the countersunk screw shown in FIG. 19(c) is added to the plan view of the receiving pad shown in FIG. 19(a). 20(b) is an enlarged view of the portion surrounded by the dashed line in FIG. 18(c), and FIG. 20(d) is an enlarged view of a portion of FIG. 20(b). 18(c), 20(b) and 20(d), the tightening bolt 18, the pad 18a, the countersunk screw 37, and the receiving pad 40 are not shown in cross section, but shown externally. 1 to 9 and 14 to 17 are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 18(a), the main rope support 1d of the present invention is characterized by having a clamp 2e instead of the clamp 2d in the main rope support 1c already described as the third embodiment. Since the front view of the main rope support 1d is the same as the front view of the main rope support 1c shown in FIG. 14(a), the description thereof will be omitted.
As shown in FIGS. 18(b) and 18(c), the clamp 2e has a recessed holding portion 16e (FIGS. 16(d) and 16(e)) in the second leg 21 of the clamp body 15 in the clamp 2d. ) is provided, a concave guide portion 16f (see FIGS. 19(d) and 19(E)) is provided, and a receiving side pad 40 is provided instead of the receiving side pad 38 and the washer 39. ing.

As shown in FIGS. 19(a) to 19(c), the receiving pad 40 has a convex portion 40d instead of the contact surface 38b of the receiving pad 38 so as to protrude in the direction perpendicular to the first cutting plane. is formed, and a surface (contact surface 40b) in contact with the second leg portion 21 is provided on the convex portion 40d so as to form a predetermined angle (eg, 5 degrees) with respect to the first cut surface. ing. Further, the receiving side pad 40 is provided with a screw insertion hole 40 a having the same shape as the screw insertion hole 38 a of the receiving side pad 38 . That is, when viewed from above, the screw insertion hole 40a has such a shape that parts of two circles through which the shaft portion 37b of the countersunk screw 37 can be inserted overlap each other. The countersunk screw 37 has a structure in which the head portion 37a is arranged inside the receiving side pad 40 while the shaft portion 37b is inserted into the screw insertion hole 40a.

As shown in FIG. 19(d), the threaded hole 16d has a central axis 37c that is aligned with the central axis 18b of the tightening bolt 18 on a virtual plane 28a (see FIG. 5(b)) when the countersunk screw 37 is screwed into the screw hole 16d. It is provided on the inner surface 21a of the second leg 21 of the clamp body 15 so as to be parallel to the horizontal direction when the column body 10 is parallel to the vertical direction. Although the screw hole 16d is a bottomed hole in this embodiment, the screw hole 16d is not limited to such a structure, and may be a through hole.
As shown in FIG. 19(e), on the inner surface 21a of the second leg portion 21 of the clamp body 15, a guide portion 16f having a predetermined depth is provided inside a portion of the convex portion 40d of the receiving pad 40. provided as possible. The guide portion 16f is formed such that the distance between the bottom surface and the first leg portion 20 becomes narrower toward the distal end side of the second leg portion 21. As shown in FIG.
The contour line of the screw insertion hole 40a of the receiving pad 40 in plan view is formed by two arcs having a radius larger than the radius of the shaft portion 37b of the countersunk screw 37. is narrower than the thickness of the shaft portion 37b of the countersunk screw 37. The contact surface 40b of the receiving pad 40 has a rectangular shape in plan view, and two of the four sides forming the rectangle are formed so as to be parallel to the line segment connecting the centers of the arcs. there is
One of the two arcs forming the contour line when the screw insertion hole 40a of the receiving pad 40 is viewed from above has its center centered on the central axis of the receiving pad 40 (passing through the center of the sphere described above). , and a straight line perpendicular to the first cutting plane). Therefore, when the shaft portion 37b is inserted into the screw insertion hole 40a of the receiving pad 40 so that the central axis 37c of the countersunk screw 37 coincides with the central axis of the receiving pad 40, as shown in FIG. A shaft portion 37b of the countersunk screw 37 is arranged within the one arc.
Further, as shown in FIG. 20(b), the receiving pad 40 is positioned so that the bottom surface of the guide portion 16f of the second leg portion 21 with respect to the contact surface 40b (see FIGS. 19(b) and 19(c)). are in contact with each other, and the narrow side faces downward when the convex portion 40d is viewed from the side.

When the H steel flange 22a is clamped by the clamp 2e having the above structure, the contact surface 40c of the receiving pad 40 comes into contact with the side surface of the flange 22a as shown in FIG. 20(b). In this state, when the support body 10 (see FIG. 18(a)) of the main rope support 1d is pulled by the main rope in a direction perpendicular to the plane of the paper, at least one of the three second legs 21 A force is generated in the book to move it upward as indicated by an arrow F. At this time, since the countersunk screw 37 has its shaft portion 37b screwed into the screw hole 16d (see FIGS. 19(d) and 19(e)) provided in the second leg portion 21, the countersunk screw 37 is An upward force from the second leg 21 acts on . On the other hand, the frictional force generated between the contact surface 40c and the side surface of the flange 22a acts downward on the receiving pad 40. As shown in FIG. As a result, as shown in FIGS. 20(c) and 20(d), the shaft portion 37b of the countersunk screw 37 moves upward while deforming the screw insertion hole 40a of the receiving side pad 40. As a result of the upward movement of the second leg 21 relative to the pad 40, a force is applied by the second leg 21 to push the receiving pad 40 toward the flange 22a. As a result, the holding force of the clamp 2e is strengthened, so that in the master rope strut 1d, the effect that the strut main body 10 is less likely to come off from the flange 22a and the effect of being superior in safety is exhibited more effectively than in the master rope strut 1a.

INDUSTRIAL APPLICABILITY The present invention is applicable to the installation of a master rope for mooring the lifeline of a worker at a site where work at height is performed.

Reference Signs List 1a to 1d Master rope struts 2a to 2e Clamp 3 Connecting fitting 4 Rectangular tube 4a Side surface 4b Connecting hole 4c Lower end 5 Substrate 5a Upper surface 5b Lower surface 6, 7 Supporting plate 6a, 7a Upper end 6b, 7b Lower end 6c, 7c Notch 8 Connecting plate 8a Fixing bolt insertion hole 8b Upper surface 9a Plain washer 9b Spring washer 10 Column body 10a Lower end 10b Upper end 10c Side 10d Connection hole 11a Upper column 11b Lower column 12a to 12c Grip 13 Connector 13a Screw 13b Nut 14a, 14b Connecting hole 15 Clamp body 15a Upper surface 16a Fixing bolt hole 16b Tightening bolt hole 16c Receiving bolt hole 16d Screw hole 16e Holding part 16f Guide part 17 Fixing bolt 18 Tightening bolt 18a Pad 18b Center shaft 19 Receiving bolt 19a Pad 19b Central shaft 20 First leg 21 Second leg 21a Inner surface 22 H steel 22a Flange 23 Main rope 24 Clamp reinforcing jig 25 Clamp main body 25a Upper surface 26 First leg 27 Second leg 28a, 28b Virtual plane 28c Virtual plane of symmetry 29 Jig clamp 30 Connecting member 30a Connecting piece 31 Jig clamp body 32 Tightening bolt for jig 32a Pad 32b Central axis 33 Receiving bolt for jig 33a Pad 33b Center Axis 34 First jig leg 35 Second jig leg 36 Fixing bolt insertion hole 37 Countersunk screw 37a Head 37b Shaft 37c Center shaft 38 Receiving pad 38a Screw insertion hole 38b , 38c... Contact surface 39... Washer 39a... First contact surface 39b... Second contact surface 39c... Insertion hole 40... Receiving side pad 40a... Screw insertion hole 40b, 40c... Contact surface 40d... Convex part

Claims (9)

A main rope post installed on a plate-shaped member installed parallel to the vertical direction,
a clamp body having first and second legs facing each other and opening downward; a tightening bolt screwed into a tightening bolt hole provided in the first leg; a clamp comprising a receiving bolt mounted on a second leg portion and holding the plate-like member together with the tightening bolt at each tip end thereof;
A connecting fitting installed on the upper side of this clamp,
a column body to which the connecting metal fitting is attached at the lower end and which is installed so that the longitudinal direction is parallel to the vertical direction;
A plurality of sets of the tightening bolts and the receiving bolts are installed, and their respective central axes are arranged in a plurality of imaginary planes parallel to the column body and parallel to each other, A main rope strut, wherein the clamp is attached to the plate-like member so that the imaginary plane and the plate-like member are perpendicular to each other. 2. The main rope strut according to claim 1, wherein the tightening bolt and the receiving bolt are installed with the central axis inclined with respect to the horizontal direction so that the tip portion faces upward. . Instead of the receiving bolt, the clamp has a receiving pad, a screw member inserted into a screw insertion hole provided in the receiving side pad, and an insertion hole for the screw member, and has a wedge shape when viewed from the side. washer and provision,
The second leg is provided with a screw hole into which the screw member is screwed, and a recessed holding portion in which a part of the washer can be arranged,
The screw insertion hole has a contour line in a plan view that is formed by partially overlapping two circles, at least one of which has a larger radius than the shaft portion of the screw member. the portion of the narrow interval is narrower than the thickness of the shaft portion of the screw member;
2. The main rope post according to claim 1, wherein the washer is installed in the holding part so that the narrower side faces upward when viewed from the side. Instead of having the washer, the clamp has a convex portion formed on the surface of the receiving pad facing the second leg portion, and a guide portion for guiding the convex portion in the vertical direction is provided with the second leg portion. provided on the leg of
The convex portion has a wedge shape when viewed from the side,
The guide portion is formed so that the distance between the bottom surface and the first leg portion becomes narrower toward the tip side of the second leg portion,
4. The main rope strut according to claim 3, wherein the receiving side pad is installed so that the narrow side faces downward when the convex portion is viewed from the side. The connecting fitting is
a substrate installed at the lower end of the support body;
two support plates having upper ends joined to the lower surface of the substrate in a cross-assembled state;
a connecting plate whose lower surface is connected to the clamp main body and whose lower ends of the two support plates are joined to the upper surface, and the two support plates are connected to each other in a state of being installed on the upper side of the clamp. 5. The main rope support according to any one of claims 1 to 4, wherein one of the two is arranged so as to be parallel to the virtual plane. The clamp body is provided with a fixing bolt hole into which a fixing bolt is screwed on the upper surface,
The main rope strut according to claim 5, wherein the connecting plate is provided with a fixing bolt insertion hole through which the fixing bolt is inserted. Two annular members to which one end of the main rope is attached respectively form a cross in plan view, and are installed on the upper part of the pillar body so that one of them is parallel to the virtual plane and the other is orthogonal to the virtual plane. 7. The main rope strut according to any one of claims 1 to 6, characterized in that the main rope strut is . A clamp that opens downward and is provided with a tightening bolt, a connecting metal fitting that is detachably connected to the upper surface of the clamp, and a column body that is installed parallel to the vertical direction with the connecting metal fitting attached to the lower end. , A clamp reinforcing jig attached to a main rope support installed on a plate-shaped member installed parallel to the vertical direction,
a downwardly opening jig clamp body having a first jig leg portion and a second jig leg portion arranged to face each other across a virtual plane of symmetry;
a jig tightening bolt screwed into a jig tightening bolt hole provided in the first jig leg;
a pair of jig clamps comprising: a jig receiving bolt that is mounted on the second jig leg portion and clamps the plate-shaped member between tip portions together with the jig tightening bolt;
a connecting member that connects the upper parts of the pair of jig clamps,
The pair of jig clamps are arranged on both sides of the tightening bolt when the connecting member is installed on the upper surface of the clamp,
center axes of the jig tightening bolt and the jig receiving bolt are arranged in the same imaginary plane perpendicular to the imaginary plane of symmetry;
The connecting member is detachably installed between the clamp and the connecting fitting,
A clamp reinforcing jig, wherein the connecting fitting is connected to the clamp via the connecting member. The jig tightening bolt and the jig receiving bolt are installed in a state in which the central axis is inclined with respect to a direction orthogonal to the virtual plane of symmetry so that the tip portion faces upward. The clamp reinforcing jig according to claim 8.

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