JP6924650B2 - Reinforcing hardware for pipe support - Google Patents

Description

The present invention relates to a reinforcing metal fitting that improves the yield strength of a pipe support used for formwork support for concrete work.

The strength of pipe supports used in formwork support for concrete work is stipulated in the Japanese Industrial Standards (A8561), and the application is arranged according to the structure and scale of each building. At that time, pipe supports may be connected to each other with horizontal members or braces, and buckling measures may be taken due to eccentric load or the like.

On the other hand, in Patent Document 1, by individually reinforcing the pipe support, the use of horizontal lumber, etc. is omitted as much as possible, thereby saving the time and personnel required for the installation and dismantling of the formwork support, and also. , Proposals have been made to secure a large flow line for work.

That is, the pipe support reinforcing cylinder of Patent Document 1 is configured to fix a tubular body that can be detachably attached to and detached from the intermediate position of the pipe support to the pipe support. Specifically, the tubular body is a pipe. It is said that it has an inner diameter larger than the outer diameter of the support and has a wall thickness and length sufficient to prevent its buckling, and the following two configurations are disclosed to fix this to the pipe support. Has been done. One is a tightening bolt that is screwed from the outside to the inside of the tubular body (Figs. 1 to 3 of the same document 1), and the other is that the tubular body itself is divided into two parts. A mold is used, and these are clamped together with a hinge, and the split molds are fastened with locking bolts and fixed by sandwiching a pipe support (Fig. 4 of the same document 1).

Jikkenhei 1-76952 Gazette

Since the reinforcing cylinder of Patent Document 1 is provided with two pairs of screw holes in three upper and lower stages in the tubular body in one fixing means (FIGS. 1 and 2 of the same document 1). The bending strength of the tubular body is impaired by the large number of screw holes of 6 in total, and the second fixing means adopts a configuration in which the split molds divided into two are connected by a hinge, so the hinge part can be parted with less force. In any case, the pipe support cannot be reliably prevented from buckling because it is deformed from the butt portion of the split type.

Further, when the reinforcing cylinder of Patent Document 1 is fixed in the middle of the insertion pipe of the pipe support as shown in FIG. 2, the tubular body has the total length even if the overlapping portion is reinforced. Since it is a straight tube with an inner diameter larger than the outer diameter of the pipe support, the insertion pipe is not restrained at the upper and lower ends, and the insertion pipe may buckle due to eccentric load with the boundary with this tubular body as a weak point. There is.

Further, since the reinforcing cylinder of Patent Document 1 requires a work of fixing the cylinder to the pipe support with a tightening bolt or a locking bolt, it takes time and effort to apply this to all pipe supports. It takes.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to disclose a reinforcing metal fitting that can be easily applied to a pipe support and can more reliably prevent buckling. Is.

In order to achieve the above-mentioned object, in the present invention, an insertion tube inserted into a conventionally known lumbar tube is fixed with a support pin via a pin hole, and the support pin is screwed into a male screw portion of the lumbar tube. It is used by inserting it into a pipe support whose total length is adjusted by setting it to an arbitrary height position with a nut, and a reinforcing metal fitting is constructed using a round steel pipe material typified by a drawn steel pipe as a foundation material.

That is, as shown in FIG. 6, the pipe support PS itself has a waist tube 10 having a pair of vertically long elongated holes 12 provided at symmetrical plane positions of the male threaded portion 11 with the upper part of the pipe as the male threaded portion 11. An insertion tube 20 having a plurality of pairs of pin holes 21 vertically inserted into the waist tube 10 from the male screw portion 11 side and communicating with the pair of elongated holes 12, and the elongated holes 12 and the pin holes. The support pin 30 that simultaneously penetrates the waist tube 10 and the insertion tube 20 in the horizontal direction via 21 and the support that is screwed into the male threaded portion 11 and protrudes from the male threaded portion 11 on the upper surface 41 thereof. It is a known configuration including an adjusting nut 40 that supports both ends 31 of the pin 30 from below and adjusts the support pin 30 to an arbitrary height position along the elongated hole 12. Reference numeral 13 is a base plate provided at the lower end of the waist tube 10, and 22 is a receiving plate provided at the upper end of the insertion tube 20. Then, when it is used as a support for a slab or a beam, the support pin 30 is penetrated through a pair of a plurality of pairs of pin holes 21 according to the floor height, and then the adjustment nut 40 is turned by a handle 42 or the like as a whole. Fine-tuning the length is the same as before.

The reinforcing metal fitting of the present invention applied to such a pipe support has an inner diameter for inserting the male screw portion with almost no gap corresponding to the male screw portion and an outer diameter smaller than the upper surface of the adjusting nut. It is provided with a hardware body made of a round steel pipe material having a length that covers a part of the insertion pipe from the upper surface of the adjusting nut via the male screw portion. A pair of notches are formed on the lower end edge of the hardware body so as to fit on both ends of the support pin from above so that the hardware body can be placed on the upper surface of the adjusting nut.

Further, the opening on the upper surface of the hardware body is provided with at least a pair of arc-shaped steady rest portions in a plan view, or a ring-shaped steady rest portion in a plan view, facing inward in the radial direction and abutting on the outer peripheral surface of the insertion pipe. It is characterized by having.

The reinforcing metal fitting of the present invention is inserted into one of the waist pipes and the insertion pipes before being connected, and after installing the pipe support according to the conventional method, the metal fitting body is fitted into the notch formed at the lower end edge thereof. The set is completed just by aligning with.

By setting in this way, the reinforcing hardware is placed on the adjusting nut of the pipe support in a state where the lower end edge is in close contact, and covers the male screw portion and the insertion pipe by the length from the upper surface of the adjusting nut. At this time, the reinforcing hardware is restrained from wobbling by inserting the male screw portion of the lumbar tube from the lower side of the hardware body with almost no gap, and in this state, the insertion tube is restrained by the steady rest portion of the upper opening. It will be. Therefore, it is possible to improve the integrity of the waist tube and the insertion tube within the cover range of the reinforcing hardware.

When an eccentric load is generated during use as a support for slabs and beams, the pipe support uses the upper end of the insertion pipe (reception plate) or the lower end of the lumbar pipe (base plate) as the fulcrum, the support pin as the fulcrum, and the lumbar pipe (male). An attempt is made to buckle with the boundary between the threaded portion) and the outer diameter of the insertion pipe as the point of action, but since the reinforcing metal fitting of the present invention covers the fulcrum and the point of action, buckling within the range is reliably prevented. can do.

As mentioned above, this reinforcing hardware prevents buckling of the pipe support within its coverage range, and if its length covers the entire insertion pipe exposed from the adjusting nut, it is the most buckling-preventing. The effect is enhanced. However, since such a long reinforcing hardware is disadvantageous in terms of on-site handling and unit price of the reinforcing hardware, the hardware body should have a length that covers two or three pairs of upper and lower pin holes in the insertion pipe. It is appropriate to do.

In this case, the hardware body is provided with a through hole that communicates with the pin hole, and a fixing pin that penetrates the insertion pipe through the through hole and the pin hole is provided in addition to the support pin to provide the entire length of the pipe support by the adjusting nut. Reinforcing hardware can be fixed to the pipe support before adjustment. The fixing pin may be removed after adjusting the total length of the pipe support, or may be left in the inserted state as it is.

On the other hand, it is preferable that the steady rest portion has a lower end inside the main body of the hardware and has a length such that the upper end reaches at least the opening surface on the upper side of the main body of the hardware. This is because the strength of the steady rest portion itself can be increased as compared with the case where the steady rest portion is projected upward with the opening surface of the hardware body as the base end.

Further, the steady rest portion may be cylindrically provided on the entire circumference of the opening of the hardware body, but by adopting a steady rest portion having a central angle of an arc exceeding 90 degrees in a plan view, the restraint strength of the insertion pipe can be increased. Welding to the main body of the hardware can be easily performed without lowering it.

At that time, it is preferable that the steady rest portion is formed by welding a curved plate obtained by bending a flat bar of a steel plate having a predetermined thickness to the upper opening of the metal body.

On the other hand, the hardware body is preferably seamless or semi-seamless. This is because by adopting a seamless metal body, the strength of the reinforcing metal itself is increased, and buckling can be prevented more reliably.

According to the reinforcing metal fitting of the present invention, the bending strength against an eccentric load or the like is improved while improving the integrity of the waist pipe and the insertion pipe in a certain range including the adjustment nut that is most likely to buckle as a joint of the pipe support and the support pin above. By reinforcing the pipe support, the strength of the pipe support is improved and buckling is prevented more reliably. Therefore, the number of pipe supports used can be reduced as compared with the conventional case, and since it is easy to set the pipe support, the work time and the number of workers involved in the installation / disassembly can be significantly reduced.

Perspective view of the reinforcing metal fitting according to the first embodiment of the present invention. Same as above, application diagram for pipe support Front view of the reinforcing metal fitting according to the second embodiment of the present invention. Front view of the reinforcing metal fitting according to the third embodiment of the present invention. Top view of the reinforcing metal fitting of the present invention Explanatory drawing of conventionally known pipe support

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a reinforcing metal fitting according to the first embodiment of the present invention, in which a round steel pipe material cut to a predetermined length is used as a foundation material of the metal fitting main body 1, and a pipe shaft C is centered on the lower end edge 1a thereof. A pair of notches 2 are formed at symmetrical positions, and a steady rest portion 3 made of a curved steel plate having an arcuate shape in a plan view is welded to the upper opening 1b so as to face each other inward in the radial direction. Further, the hardware body 1 is provided with a pair of through holes 4 communicating with each other directly above each of the notch portions 2.

This reinforcing hardware is used by inserting it into a conventionally known pipe support PS as shown in FIG. 6, and the hardware body 1 has an inner diameter corresponding to the male screw portion 11 of the waist pipe 10 and an adjusting nut 40. It is made of a round steel pipe material having an outer diameter smaller than that of the upper surface 41. Further, in the case of this embodiment, the length of the hardware body 1 is assumed to cover the pin holes 21 of the insertion pipe 20 for two upper and lower pairs.

In such a hardware body 1, each of the pair of notch portions 2 is formed in an inverted U shape, and is sized to be fitted into each of both end portions 31 of the support pin 30 of the pipe support PS from above.

Further, each of the pair of steady rest portions 3 is welded to a curved plate obtained by bending a flat bar of a steel plate having a predetermined thickness so that the lower end thereof is located inside the hardware body 1. Further, the steady rest portion 3 has a height at which the upper portion thereof protrudes upward from the upper opening 1b of the hardware main body 1, and the inner surface of these steady rest portions 3 abuts on the outer peripheral surface of the insertion pipe 20.

Further, the pair of through holes 4 communicate with the pin hole 21 of the insertion pipe 20 so that the distance from the notch portion 2 matches the vertical distance of the pin hole 21 in the insertion pipe 20.

FIG. 2 shows a reinforced state in which the reinforcing metal fitting is applied to the pipe support PS of FIG. 6, and the adjusting nut 40 is adjusted by adjusting the position so that the notch portion 2 is fitted into both end portions 31 of the support pin 30. It is placed in a state where the lower end edge is in close contact with the upper surface 41 of the above. Then, the male screw portion 11 of the waist tube 10 is inserted into the inside with almost no gap, and the wobbling of the hardware body 1 is restrained. Further, the wobbling of the insertion pipe 20 is restrained in the upper part by the contact with the steady rest portion 3. Therefore, the integrity of the waist tube 10 and the insertion tube 20 is improved in the coverage range of the reinforcing metal fittings, and buckling in the range is prevented.

On the other hand, before adjusting the length of the pipe support PS, it is preferable to temporarily fix the reinforcing metal fitting with a fixing pin (not shown) different from the support pin 30 by using the through hole 4. That is, although this reinforcing hardware is inserted and set in the pipe support PS in advance, if the pipe support PS is set up as it is, it will fall naturally, and when adjusting the length of the pipe support PS, the support pin 30 is used. It interferes with the work of inserting and turning the adjusting nut 40. Therefore, it is preferable to temporarily fix the pipe support PS at a certain position. Further, the fixing pin may be pulled out after adjusting the length of the pipe support PS, but if it is left in the inserted state as it is, the insertion tube 20 is strengthened against the waist tube 10 by both the fixing pin and the support pin 30. Can be connected to. That is, if a compressive force equal to or greater than the proof stress acts on the pipe support PS, the pin begins to bend and deform and contracts in the axial direction. However, as described above, if the fixing pin is left, the total of 2 with the support pin 30 is 2. The pipe support PS is supported by the book, and a mechanism for transmitting the load is configured by these two pins, and as a result, the effect of preventing buckling is enhanced without changing the material of the pins.

FIG. 3 shows the reinforcing hardware according to the second embodiment, and the length of the hardware main body 5 is longer than that of the first embodiment. The length is the difference between the upper and lower pairs of the pin holes 21 in the insertion tube 20, and in this embodiment, the length is set to cover a total of three pairs of pin holes 21.

If the length of the hardware body 5 is increased in this way, the range for preventing buckling is expanded. However, if it is made too long, the bending strength of the hardware body 5 decreases, so it is appropriate that the length of the hardware body 5 is 2 to 3 pairs above and below the pin hole 21.

FIG. 4 shows the reinforcing hardware according to the third embodiment, and the height of the steady rest portion 6 is smaller than that of the first and second embodiments. That is, the upper edge is flush with the upper opening surface of the hardware body 1, and the height is set so that the entire surface is buried in the hardware body 1. The advantage in this way is the saving of the steel material used for the steady rest portion 6, but it also has the technical significance of eliminating the deformation of the protruding portion that may occur when the upper portion is projected from the hardware body 1.

As a method of providing the steady rest portion on the hardware body 1, as shown in FIG. 5, a welding hole 7 is provided in the upper part of the hardware body 1, and this portion is welded to be integrated with the hardware body 1. There is a means. However, the steady rest portion may be fixed to the hardware body 1 by any other means as long as it does not fall off carelessly.

Further, in the above embodiment, since the central angle of the arc of each of the steady rest portions is 120 degrees, which is more than 90 degrees (see FIG. 5), a sufficient contact area with the outer peripheral surface of the insertion pipe 20 can be secured. It is not excluded from the present invention that the steady rest portions have a central angle of less than 90 degrees, and for example, three steady rest portions having a central angle of 60 degrees can be provided at equal intervals.

Further, the hardware body 1 can be based on a round steel pipe material represented by a drawn steel pipe, but from the viewpoint of ensuring its own bending strength, it is most preferable to be seamless, and it may be semi-seamless. preferable.

1.5 Hardware body 1a Lower edge 1b Upper opening 2 Notch 3/6 Steering part 4 Through hole 7 Welded hole PS Pipe support 10 Waist pipe 11 Male threaded part 12 Long hole 20 Insert pipe 21 Pin hole 30 Support pin 31 Both ends 40 Adjusting nut 41 Top surface

Claims (7)

The insertion tube inserted into the lumbar tube is fixed with a support pin via a pin hole, and the overall length is adjusted by setting the support pin to an arbitrary height position with an adjustment nut screwed into the male threaded portion of the lumbar tube. It is a reinforcing hardware to be inserted into the pipe support
It has an inner diameter corresponding to the male threaded portion of the lumbar tube and an outer diameter smaller than the upper surface of the adjusting nut, and is a part of the insertion tube from the upper surface of the adjusting nut via the male threaded portion. Equipped with a hardware body made of round steel pipe material with a length that covers
A pair of notches that fit into both ends of the support pin from above are formed on the lower end edge of the hardware body so that the round steel pipe material can be placed on the upper surface of the adjusting nut.
A reinforcing metal fitting for pipe support, characterized in that the upper opening of the metal fitting body is provided with a steady rest portion having an arc shape in a plan view that abuts on the outer peripheral surface of the insertion pipe inward in the radial direction. The reinforcing hardware for pipe support according to claim 1, wherein the hardware body has a length that covers two or three pairs of upper and lower pin holes in the insertion pipe. The reinforcing metal fitting for pipe support according to claim 1 or 2 , which is provided with a through hole that communicates with the pin hole in the hardware body and is provided with a fixing pin that penetrates the insertion pipe through the through hole and the pin hole in addition to the support pin. .. The reinforcing hardware for pipe support according to claim 1, 2 or 3, wherein the steady rest portion has a lower end inside the main body of the hardware and has a length at which the upper end reaches at least the upper opening surface of the main body of the hardware. The reinforcing hardware for pipe support according to any one of claims 1 to 4, wherein the steady rest portion has a central angle of more than 90 degrees in a plan view. The reinforcing metal fitting for pipe support according to claim 5, wherein the steady rest portion is formed by welding a curved plate obtained by bending a flat bar of a steel plate having a predetermined thickness to an upper opening of a metal fitting body. The reinforcing hardware for pipe support according to any one of claims 1 to 6, wherein the hardware body is made of seamless or semi-seamless round steel pipe material.

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