JP4875358B2 - Metal base for concrete formwork - Google Patents

Description

  The present invention is a metal for a concrete formwork that is used to fasten a concrete formwork at a predetermined interval by being attached to an end of a fastening rod such as a separator or an insert, or applied as a support material for a support bracket. It relates to the pedestal.

  For example, as a pedestal (generally referred to as a taper cone) that is screwed and assembled to the end of a separator to support a concrete formwork from the inside, a synthetic resin (polypropylene) truncated cone on the outside of an iron shaft There are some which are assembled and assembled, but because of lack of load resistance, the whole is integrally molded with metal (iron) instead of the cone (called plastic cone etc.) made mainly of resin. The pedestal is used in places where load resistance is required.

  The pedestal composed only of metal outline iron is superior to the former plastic pedestal in terms of load resistance, that is, strength, but easily adheres to the cast concrete, and is removed from the concrete body after demolding. Even if it is difficult to detach, even if it can detach, the concrete will be damaged by the concrete, and the damaged part will be filled with concrete when it is reused (it is reused because it is expensive). The withdrawal operation became more difficult, and there was a problem in reuse.

  The present invention has been devised to eliminate such drawbacks of the metal pedestal and to provide a metal pedestal for concrete formwork having load resistance without changing from the conventional one.

Screwed into the end of a fastening rod such as a separator or insert, and provided with a locking recess for a removal tool on the large-diameter end surface of a metal frustum-shaped main body. The peripheral side surface of the main body and the peripheral end portion of the end surface that is continuous with the peripheral side surface and surrounds the locking recess are formed in a truncated cone shape with respect to the protective film by a protective film formed by thermally shrinking a resin tube. The configuration is such that the main body is dressed so as to freely rotate .

According to the present invention, since the locking recess forming the tool locking portion is exposed to the outside, the tool is locked in the locking recess and rotated without damaging the protective film. It can be performed withdrawal from the concrete body by, during said leaving work, without contacting the concrete by frustoconical principal protective film, when leaving the operation from freely rotated against the protective film detached from the concrete Since the protective film is locked to the peripheral edge of the end surface of the main body, it can be detached from the concrete along with the main body, and the outer peripheral surface of the main body is generally damaged. We can provide products that can be reused reliably.

  The drawings show an embodiment of a metal base for a concrete form according to the present invention, and the base A of each embodiment is related to a separation tool on an end face 1a on the large diameter side (surface c ′ side of the concrete c). A frustoconical main body 1 made of metal (generally, iron) provided with a stop recess 2 is provided, and is continuous with the entire peripheral side surface 1b of the main body 1 and the peripheral side surface 1b. The peripheral end portion 1a 'of the end face 1a surrounding the outer periphery is covered with a protective film 3 formed by heat shrinking a resin (in the embodiment, polyolefin resin) tube.

First Embodiment A metal base A for concrete formwork shown in FIGS. 1 to 4 projects a screw rod 4 on an end surface 1c on the small diameter side of the main body 1 on the extension of the axis of the main body 1. A screw hole 5a is formed on the large-diameter side end surface 1a of the main body 1 on the axis, and the locking recess 2 is formed so as to surround the screw hole 5a. , The outer peripheral edge 2b forms a circle).

  The pedestal A of this first embodiment is constructed by screwing a screw rod 4 into a screw hole 11a provided on the end face of the insert 11 and assembling it at the end of the insert 11, and replacing the formwork (or slat) with concrete c. The fixing screw 12 is superposed on the surface c ′, for example, through a bracket b for scaffolding, and is screwed to the screw hole 5a of the base A so as to be used as a mounting base for the bracket b.

  Then, after removing the bracket b, an appropriate removal tool is locked to the locking recess 2 using the hexagonal inner peripheral edge 2a, the base A is rotated, and the screw rod 4 is detached from the insert 11; It prepares for the use of the stage.

Second Embodiment In the second embodiment shown in FIGS. 5 to 8, the metal base A according to the present invention is constituted only by the truncated cone-shaped main body 1 and the protective film 3 wearing this, and the main body 1 A screw hole 4b is provided on the axis of the screw hole 4b, and the locking recess 2 communicating with the screw hole 4b is provided on the large-diameter end surface 1a side of the screw hole 4b. A peripheral edge 2b 'surrounding 4b is formed in a hexagonal shape when viewed from the front, and the removal tool is locked.

  The pedestal A of this second embodiment is assembled to the end of the separator 13 by screwing one half of the screw hole 4b on the side of the small diameter side end face 1c of the main body 1 into the screw 13a at the end of the separator 13. A fastening rod 16 constituting a fastening device 15 of the mold 14 is screwed into the other half of the hole 4b on the large diameter side end 1a side through the mold 14, and the seat of the mold 14 is received. It is made to use as.

  In the figure, 17 is a vertical and horizontal pipe constituting the fastening device 15, and 18 is also a fastening device 15, and a pressing force that presses the mold 14 against the base A according to the present invention via the pipe 17. With the washer, the washer 18 is tightened with a nut 19.

  Then, after the mold 14 is removed from the mold, the proper locking tool 2 is used to lock and rotate the locking recesses 2 arranged and exposed at the appropriate positions on the surface of the concrete c using the hexagonal shape of the peripheral edge 2b ′. The base A is detached from the separator 13 to prepare for the use of the next stage.

The partial missing side view of a 1st Example. The front view of a 1st Example. Sectional drawing which shows the use condition of a 1st Example. Explanatory drawing which shows the state at the time of detachment | leave of a 1st Example. The partially missing side view of the second embodiment. The front view of a 2nd Example. Sectional drawing which shows the use condition of 2nd Example. Sectional drawing which shows the state at the time of detachment | leave of 2nd Example.

Explanation of symbols

1 frustoconical main body 1a end face 1b peripheral side face 2 locking recess 3 protective film

Claims (1)

Screwed into the end of a fastening rod such as a separator or insert, and provided with a locking recess for a removal tool on the large-diameter end surface of a metal frustum-shaped main body. The peripheral side surface of the main body and the peripheral end portion of the end surface that is continuous with the peripheral side surface and surrounds the locking recess are formed in a truncated cone shape with respect to the protective film by a protective film formed by thermally shrinking a resin tube. A metal pedestal for concrete formwork so that the main body can freely rotate .

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