JPH028001Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a welding embedding tool, which is a type of component for construction work, and in particular, the welding surface for welding mounting members such as handrail supports is a recess formed in a concrete surface. This invention relates to a welding embedding tool used to form a welding embed on a bottom surface.

The conventional welding embedding tool 1, as shown in FIG.
It consists of an embedded metal fitting 4 formed by welding a substantially L-shaped anchor reinforcing bar 3 to the center of the back surface of a metal plate 2 constituting a welding surface, and a concave part forming body 5 made of polystyrene foam. Place the recess forming body 5,
It is configured to be fixed with adhesive tape 6 or the like. This welding embedding tool 1 is manufactured by pouring concrete into formworks 8a, 8b, and 8c to form a veranda 7, as shown in FIG. The welding embedding tool 1 is placed by pushing it in so that it is flush with the welding embedding tool 1.
After the concrete has hardened, the formworks 8a, 8b, 8c are dismantled and the recess forming body 5 is removed, as shown in FIG. A recessed portion 9 is formed. After that, when attaching the handrail 10 to the balcony 7, the lower end of the handrail support 10a is welded to the metal plate 2, as shown in FIG.
The recess 9 is appropriately filled with mortar or the like.

By the way, when such a welding embedding device 1 is used, it is time-consuming to remove the recess forming body 5 made of styrofoam by breaking it, and the metal plate 2 of each embedding device is There was a problem in that the depth and parallelism were not accurate, which resulted in variations, and there were cases where welding could not be completed completely during installation. Furthermore, it was difficult to arrange the welding embedding tool 1 at an accurate pitch.

For this reason, as described in Japanese Utility Model Application Publication No. 56-74125, an embedded metal fitting in which an anchor part having a screw hole is hung vertically in the center of a metal plate constituting the welding surface, and a bottom part It consists of a cone with a bolt insertion hole in the center and a bolt that is screwed into the screw hole of the embedded fitting through the insertion hole of this cone. With the upper end surface of the cone in contact with the lower surface of the bolt insertion hole drilled in the plate, and the metal plate of the embedded fitting in contact with the outer bottom surface of the cone,
By screwing the bolt from the bolt insertion hole of the mounting plate through the bolt insertion hole of the cone and into the screw hole of the anchor part of the embedded metal fitting, the embedded metal fitting can be fixed in an accurate position on the underside of the mounting plate through the cone. Later, a metal fitting was devised in which the metal surface of the embedded fitting was exposed by pouring concrete and removing the bolts, mounting plate, and cone in sequence after the concrete had hardened.

However, according to such a structure, since the bolt is threaded from the bolt insertion hole of the mounting plate to the threaded hole of the anchor part of the embedded fitting through the bolt insertion hole of the cone, first, the bolt is inserted through the mounting plate. The cone and the embedded metal fittings must be placed one after the other in accurate positions on the bottom side of the hole, and then the bolts must be screwed into the threaded holes of the embedded metal fittings. Since the screw holes of the metal fittings are completely invisible from the outside, assembly work by screwing them cannot be easily performed, which poses a problem in that work efficiency is reduced.

Furthermore, after concrete is poured, it is difficult to remove the cone because it is integrated with the concrete, so the inner surface of the cone is struck with an appropriate tool to separate the concrete from the cone. After that, the cone can be removed, but this work requires considerable effort and the concrete surface of the recess formed at the cone removal site is destroyed, spoiling the appearance.
Furthermore, if the cone is made of synthetic resin, there is a problem that it will be damaged by hitting and cannot be reused.

The present invention was developed in view of these problems, and it enables the embedded metal fittings to be easily placed in the correct position, and the cone can be removed reliably and easily after the concrete has hardened without damaging the concrete surface. The object of the present invention is to provide an embedded tool for welding that can be used for welding.

In order to achieve this purpose, the welding embedding device of the present invention has an anchor 22 protruding from the back surface of a metal plate 21 constituting the welding surface, as shown in the drawings corresponding to the embodiment. An embedded fitting 20 is formed by drilling a screw hole 26 of an appropriate depth from the surface of the metal plate 21 in the center of the anchor 22, and a hollow interior whose outer bottom surface is in contact with the surface of the metal plate 21 so as to cover the surface of the metal plate 21. A truncated cone-shaped synthetic resin cone 23 with an open upper end integrally provided with a long nut 24 penetrating vertically in the center thereof, and a lower part of the long nut 24 of this cone 23 and the embedded metal fitting 20. screw hole 26
a first fixing bolt 25a that is screwed together to fix the metal plate 21 of the embedded fitting 20 in contact with the outer bottom surface of the cone 23; and the long nut 2 of the cone 23.
4 and a second fixing bolt 25b into which a mounting nut 28 is screwed.

The welding embedding device configured in this manner is fixed in advance with the first fixing bolt 25a with the metal plate 21 of the embedding fitting 20 in running contact with the outer bottom surface of the cone 23, and is also installed inside the cone 23. A second fixing bolt 25b is screwed into the upper part of the long nut 24 with the upper part thereof protruding from the open end of the cone 25.

After the embedded fitting 20 and the cone 25 are integrally connected in this way, the protruding end of the second fixing bolt 25b protruding from the cone 25 is inserted into a predetermined location of the mounting plate installed between the formwork. The embedded fitting is fixed to the mounting plate by inserting it into the provided hole from the bottom side and screwing the mounting nut 28 onto the end of the bolt protruding from the hole.

Next, concrete is poured into the formwork, and after the concrete has hardened, the mounting nuts 28 and mounting plates are sequentially removed, and a box spanner or the like is attached to the outer peripheral surface of the long nut 24 that is integrally provided in the center of the cone 25. By fitting and rotating the appropriate tool, cone 2
5 can be peeled off from the concrete and extracted by its rotational force.

Since the welding surface of the metal plate 21 is exposed at this extraction mark, handrail supports and the like are welded to this welding surface.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 8. 11a, 11b are formworks that partition the concrete casting space, and crosspieces 12a, 12b are arranged on the outer surface of the upper end of the formworks 11a, 11b.
11b is supported. 13 is both crosspieces 12a, 1
This is a mounting plate for a welding embedding tool 15 that is horizontally suspended between 2b, and is fixed to the crosspieces 12a and 12b with nails 14. V-shaped notches 16 are formed at both ends of the mounting plate 13, and the mounting plate 13 has these notches in markings 17 drawn on the outer surfaces of the crosspieces 12a and 12b to match the mounting pitch L of the handrail support 10a. 16 are arranged so that they match. The welding embedding device 15 includes an embedding device 20 consisting of a metal plate 21 constituting a welding surface, an anchor 22 welded to the center of the metal plate so as to protrude toward the back side, and a metal plate 20 made of synthetic resin on the small diameter side. A large truncated cone-shaped cone 23 having an area such that the end surface covers the welding surface of the metal plate 21.
A first fixing bolt 25a that fixes the embedded fitting 20 and a long nut 24 embedded so as to pass through the axial center position of the cone 23 is screwed into the long nut 24 to fix the embedded fitting 15. A second fixing bolt 25b fixes the entire body. Note that a single fixing bolt passing through the long nut 24 can also be used as the fixing bolt. In order to attach the welding embedding tool 15 to the mounting plate 13, a mounting hole 18 through which the second fixing bolt 25b passes is bored at the center of a straight line connecting the notches 17, 17. The first fixing bolt 2 is attached to one end surface of the anchor 22 facing the surface of the metal plate 21.
A screw hole 26 into which the screw 5a is screwed is formed, and an enlarged portion 27 is formed at the other end. Note that the shape of the anchor 22 is not limited to the shape shown in the drawings, but can be arbitrarily changed such as an L-shaped metal fitting. 28 is a mounting nut screwed onto the second fixing bolt 25b.
Since the cone 23 is large in size, an annular recess 29a is formed on the large-diameter end face to save synthetic resin, and reinforcing ribs 29b are formed radially in the annular recess 29a to withstand concrete pressure.

In the above configuration, the first fixing bolt 25a
One end of the cone 23 is screwed into the cone small diameter side of the long nut 24 in advance and caulked.
The other end of the fixing bolt 25a is screwed into the screw hole 26 of the embedded fitting 22, and the second fixing bolt 25b is screwed into the large cone side of the long nut 24, and this second fixing bolt 25b is attached to the mounting plate. The mounting nuts 28 are screwed through the mounting holes 18 of 13, and the welding embeddings 15 are attached to the mounting plate 13. After assembling the formworks 11a and 11b and before concrete pouring, the mounting plate 13 is attached to the crosspieces 12a and 12b. Ink stroke 17 drawn on
Welding embedding tool 1 by fixing it according to
5 accurately in the predetermined position. Thereafter, by pouring concrete 30 to the upper ends of formworks 11a and 11b, embedding fittings 20 and cones 23 are embedded in the concrete, but these are fixed bolts 2.
Since it is firmly fixed to the mounting plate 13 at 5a and 25b, it will not move or tilt during concrete pouring, and the embedded fitting 20 will not move or tilt when pouring concrete.
3, it is accurately positioned and held fixed. When the concrete 30 hardens, the mounting nuts 28 and second fixing bolts 25b are removed, and the mounting plates 13, formworks 11a, 11b, and crosspieces 12a, 1 are removed.
After disassembling the cone 2b, the long nut 2 of the cone 23 is
The cone 23 is pulled out from the concrete 30 by fitting a box spanner into the protrusion 24a of the cone 23 and turning it, and the first fixing bolt 25a is removed. By using the cone 23 in this way, it can be easily extracted, and a recess 31 is formed on the concrete surface, and the metal plate 21 forming the welding surface faces the bottom of the recess 31. In addition, the depth and parallelism of the welding surface are accurate,
Furthermore, the arrangement pitch L is also accurate. Thus, when the handrail 10 is arranged as shown in FIG. 8, the lower end of each support column 10a is located precisely and perpendicularly in the center of the metal plate 22 of each recess 31, and the metal plate 2 is easily and reliably positioned.
2 and the support column 10a can be welded. After that, the recess 31
is filled with mortar 32, etc. In addition, cone 2
3 and fixing bolts 25a, 25b can be reused any number of times.

In the above embodiment, the case where the concave part and the welding surface are facing upward has been explained, but it is obvious that it can be similarly applied to the case where the concave part and the welding surface are facing sideways, as shown in FIG. Mounting plate 1
The mounting holes 18 formed in 3 are drilled in the formwork. Also, in this case, the embedded metal fitting 20 is firmly held by the cone 23 and the fixing bolts 25a and 25b, so it will not move or tilt during concrete pouring, and will not move or tilt from the formwork of the metal plate 22 or the concrete surface. The depth and parallelism are accurate. Therefore, the attachment member 33 can be attached by welding easily and reliably.

Further, as shown in FIGS. 10 and 11, if a spiral ridge 34 extending over the entire height or a short spiral ridge 35 is provided on the circumferential surface of the cone 23, the cone 23 can be rotated. Cone 23 by washing
Since the force to pull out is applied, it is easy to pull out.

According to the welding embedding device of the present invention, as is clear from the above description, the metal plate 21 of the embedding fitting 20 is brought into contact with the outer bottom surface of the cone 23 in advance, and then the first fixing bolt 25a is tightened. Fix it and cone 2
A second nut is attached to the top of the long nut 24 provided inside 3.
After screwing together the fixing bolt 25b with its upper part protruding from the open end of the cone 25, and thus integrally connecting the embedded fitting 20 and the cone 25, The projecting end of the second fixing bolt 25b is inserted from the bottom side into the hole 18 bored at a predetermined location of the mounting plate 13 installed between the forms, and the bolt end protruding from the hole 18 is fitted with a mounting nut. 28 can be screwed,
The mounting work of the embedded metal fittings to the mounting plate 13 can be done easily and reliably, improving the work efficiency.Furthermore, since it is firmly mounted, there is no chance of accidental movement during concrete pouring, etc. It can be fixed in a precise position without tilting or tilting.

Further, after the concrete cast in the formwork hardens, the mounting nuts 28 and the mounting plates are sequentially removed, and the long nuts 24 integrally provided in the center of the cone 25 are removed.
If a suitable tool such as a box spanner is fitted to the outer peripheral surface of the cone 25 and rotated, the cone 25 will peel off from the concrete surface due to the rotational force, and the cone can be easily removed without chipping the concrete or damaging the cone. This improves work efficiency, provides a beautiful finish, and allows the cone 25 to be reused.

[Brief explanation of the drawing]

1 to 4 show conventional examples, FIG. 1 is a perspective view of a welding embedding device, FIG. 2 is a longitudinal sectional view showing an example of the arrangement of the welding embedding device, and FIG. Fig. 2 is a vertical cross-sectional view of the example with the formwork and recess forming body removed after the concrete has hardened, Fig. 4 is a longitudinal cross-sectional view of the same example with handrails attached, and Figs. 5 to 8 are the main parts. 5 is a perspective view showing the installed state of the welding embedding device, FIG. 6 is a longitudinal cross-sectional view of the same, FIG. 7 is an exploded front view of the welding embedding device, and FIG. 9 is a longitudinal sectional view showing another example of use, and FIGS. 10 and 11 are front views of other embodiments, respectively. 15... Welding embedding tool, 20... Embedding metal fitting, 2
1... Metal plate, 22... Anchor, 23... Cone, 25a, 25b... Fixing bolt, 26... Screw hole.

Claims (1)

[Scope of utility model registration request] An embedded fitting 20 having an anchor 22 protruding from the back surface of a metal plate 21 constituting a welding surface, and a screw hole 26 having an appropriate depth drilled in the center of the anchor 22 from the surface of the metal plate 21; A truncated cone-shaped synthetic resin cone with an open upper end, whose outer bottom surface is in contact with the surface of the metal plate 21 and which is integrally provided with a long nut 24 that penetrates vertically in the center of the hollow interior. 23, and the lower part of the long nut 24 of this cone 23 is screwed into the screw hole 26 of the embedded fitting 20 to fix the metal plate 21 of the embedded fitting 20 in contact with the outer bottom surface of the cone 23. the first fixing bolt 25a and the long nut 24 of the cone 23.
and a second fixing bolt 25b which is screwed into the upper part of the holder and into which a mounting nut 28 is screwed.