Static structures (e.g. – buildings) – Animal blocking lateral projection – trap – or scarer
Reexamination Certificate
1999-10-01
2001-12-11
Chen, Jose V. (Department: 3636)
Static structures (e.g., buildings)
Animal blocking lateral projection, trap, or scarer
C052S169500
Reexamination Certificate
active
06327824
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a termite shielding structure for preventing termites from entering from underground into underfloor portions of a building, and particularly to a termite shielding structure and a method for constructing the same that is capable of preventing termite paths from being formed around piping piercing through underground beams of mat foundations in case a foundation for the building is formed of mat foundations of reinforced concrete.
In case ventilation of an underfloor portion in a building is poor, it is often the case that the building is eroded by termites. Termites favorably breed on temperate and humid soil, and by entering an underfloor portion from cracks in foundations or peripheries of underground piping, they erode buildings.
Thus, measures are usually taken in that termite shielding chemicals (repellents or insecticides) are dispersed on soil on underfloor portions of buildings to prevent termites from entering owing to their chemical efficacy. However, chemical efficacy of termite shielding chemicals vanish after a short term and when used in a large amount, these chemicals may pollute peripheral environments of the building or do harm to residents, persons performing the dispersion or any other creatures.
In case foundations of the building are mat foundations of reinforced concrete and outer peripheral portions of the building are surrounded by underground beams of these mat foundations, it is possible to prevent termites from entering at least in a range of several tens of centimeters from the ground surface by the use of these underground beams of reinforced concrete. However, in case piping for plumbing water, gas or others as well as guiding pipes for electric wiring cables that are embedded underground are arranged to pierce through underground beams, there still exists the danger that termite paths be formed in the periphery of these piping.
Thus, such problems are generally coped with by preliminarily embedding tubular sleeves into the underground beams at the time of installing concrete for the underground beams wherein these sleeves form hole portions for piping piercing through the underground beams, and after inserting piping such as steel pipes that are directly used for delivery of plumbing water or other fluids or vinyl chloride pipes that serve as guiding pipes for electric wiring cables, mortar is filled into clearances formed between inner peripheral surfaces of the hole portions and pipes for preventing the entry of termites.
However, in such a termite shielding structure, these operations of filling mortar into clearances formed between hole portions for the piping that are formed by the sleeves and pipes are troublesome and result in higher construction costs, and it was often the case that the filling of mortar into the hole portion interior was incomplete so that there was still a path left for the termites to enter.
PURPOSE AND SUMMARY OF THE INVENTION
It is a purpose of the present invention to provide a termite shielding structure for underground beams that can reliably prevent underfloor entering paths being formed by termites especially at piping portions piercing through underground beams of mat foundations formed of reinforced concrete and whose maintenance is also simple, and to provide a method for constructing the same.
For achieving these purposes, the termite shielding structure for underground beams according to the present invention is characterized in that underground beam piercing pipes constituting a part of pipes for guiding plumbing for water, gas or other fluid as well as electric wiring cables assume a length identical to a width of underground beams of a mat foundation of reinforced concrete, both ends of the underground beam piercing pipes being formed with connecting portions for joints, wherein these piercing pipes are embedded and fixed within the underground beams with both pipe ends thereof being aligned with respect to both lateral surfaces of the underground beams and wherein the piercing pipes are extended by connecting the guide pipes to the connecting portions for joints formed at both ends of the piercing pipes.
Here, underground beams of the mat foundation indicate portions of foundation beams of the mat foundation that are embedded underground and which are extended in a continuous manner between columns. At portions of the piping piercing through these underground beams, underground beam piercing pipes that are arranged to assume a length identical to a width of the underground beams are embedded and fixed to the underground beams simultaneously with installing the concrete of the underground beams so that the concrete closely fits to the periphery of the underground beam piercing pipes so that the periphery is almost completely shielded. With this arrangement, it can be prevented that termite paths be formed around piping portions piercing through the underground beams.
In this manner, the termite shielding structure for underground beams according to the present invention is capable of reliably shielding the periphery of piping portions piercing through underground beams of a mat foundation so as not to leave portions at which termite paths may be formed, and since this method does not rely on chemical efficacy of termite shielding chemicals that are dispersed into the soil or termite shielding sheets, it can be achieved for a long term and reliable protection against termites from entering.
It should be noted that connecting portions for joints that are provided at both pipe ends of underground beam piercing pipes are suitably selected from various pipe joints, depending on materials and diameters of pipes to which these joints are connected, such as connecting portions through screws, connecting portions through sleeve welding, or connecting portions through flange stud joints.
According to the constructing method for shielding termites underfloor of a building of the present invention, the method comprises the step of forming underground beam piercing pipes which constitute a part of pipes for guiding plumbing for water, gas or other fluid as well as electric wiring cables and which assume a length identical to a width of underground beams of a mat foundation of reinforced concrete, both ends of the underground beam piercing pipes being formed with connecting portions for joints, and further comprising the steps of erecting frameworks for the underground beams in which the piercing pipes are aligned in a transverse manner with respect to extending directions of the underground beams, installing concrete into the frameworks for embedding and fixing the piercing pipes within the underground beams, connecting the guide pipes to the connecting portions for joints formed at both ends of the piercing pipes after removing the frameworks from cured concrete, thereby extending the pipes towards indoor and outdoor sides of the building and raising the indoor pipes to an underfloor portion of the building, and filling back the indoor side of the underground beams up to sleeve crowns of the underground beams.
According to this invention, the above termite shielding structure for underground beams can be simply constructed through rational steps when assembling the structure of reinforced concrete. After forming underground beams by installing concrete, troublesome operations such as filling mortar into sleeves are no longer necessary and there is no fear that termite paths be formed through incompleteness of filling mortar.
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Chen José V.
Rader & Fishman & Grauer, PLLC
Shinyo Co., Ltd.
White Rodney B.
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