Static molds – Miscellaneous mold adjuncts – In situ construction engineering or building type
Patent
1988-07-05
1989-12-26
Housel, James C.
Static molds
Miscellaneous mold adjuncts
In situ construction engineering or building type
52232, 249 42, E04G 1708
Patent
active
048893129
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to a device for preventing, in a concrete structure such as a concrete wall, rainwater or like from penetrating through a concrete wall surface into the concrete structure around each separator which has been left embedded therein.
2. Description of the Prior Art:
In constructing the above-mentioned concrete structure such as the concrete wall, the separator is usually used to hold each pair of molds opposed to each other at a predetermined distance and such separator is left embedded in the concrete structure after completion of this structure. More particularly, each separator is provided on its opposed ends with separator terminals, respectively, and these separator terminals are removed when the molds are disassembled upon completion of the construction. This results in formation of a recess in the concrete wall in a region which has been occupied by each of the separator terminals. Such recess must be filled up in a suitable manner for water-sealing effect.
One well-known device for prevention of rainwater or like from penetrating in the region of each separator into the concrete structure has already been described in Utility Model Publication No. 43-27286, published in Japan on Nov. 12, 1968.
However, in this device of well known art, plugs are secured with adhesive into the recesses formed in the concrete wall surface after the separator terminals have been removed from the respective separators. Such feature leads to various problems as follow:
(1) It is difficult for adhesive to spread uniformly between the inner surface of the recess and the associated plug and often a gap is formed therebetween.
(2) A gap is progressively formed between the inner surface of the recess and adhesive as the years go by, due to factors such as contraction of concrete and adhesive occurring during hardening thereof.
(3) A gap is formed also between the concrete wall and the separator.
(4) A covering depth between the concrete wall surface and the separator is relatively poor.
In consequence, said gaps serve as water passages by which rainwater or like penetrates from the wall surface through the gap between the recess in the concrete wall and the plug into the other gap between the concrete wall and the separator, causing the separator to be rusted.
These problems result in:
(a) Durability of the structure deteriorates.
(b) Rust containing water exudes over the wall surface and injures the beauty of the wall surface.
SUMMARY OF THE INVENTION
A principal object of the present invention is, therefore, to provide a device adapted to effectively prevent rainwater or like from penetrating through the wall surface into the concrete wall around each separator left therein and thereby to overcome the problems as set forth above.
The present invention provides a device for prevention of rainwater or like from penetrating into a concrete structure around each separator left embedded therein, said device comprising a hollow cylinder of synthetic resin, the latter including a female threaded cylinder made of metal or other material embedded in the interior at one end thereof and water-swollen damming-up outer rings fixed on the outer periphery so as to serve together as terminals, a threaded cylindrical portion formed at one end of each of said terminals being engaged with a male threaded portion formed around the corresponding end of the separator, and said cylinder of synthetic resin further including a plug provided with a water-swollen damming-up inner ring fixed into the interior at the other end thereof.
When each of the separator terminals is incorporated with the device according to the present invention, any quantity of water having penetrated into the gap defined between the concrete wall A and the cylinder 1 of the terminal 4 is dammed up by the water-swollen damming-up outer ring 3 against further penetration further inwards.
On the other hand, any quantity of water having penetrated into the gap defined between the cylinder 1 o
REFERENCES:
patent: 4186906 (1980-02-01), Koga
patent: 4234156 (1980-11-01), Wepf
Fukushima Takuo
Hayashida Yasumasa
Ishii Shigemichi
Ogou Sunoo
Tagomori Sadaaki
Asahi Denka Kogyo Kabushiki Kaisha
Housel James C.
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