Road structure – process – or apparatus – Traffic director – Attenuated lane marker type
Reexamination Certificate
2001-01-16
2003-11-18
Will, Thomas B. (Department: 3671)
Road structure, process, or apparatus
Traffic director
Attenuated lane marker type
Reexamination Certificate
active
06648546
ABSTRACT:
TECHNICAL FIELD
The present invention relates to inset lights embedded in the concrete pavement, such as runway, taxiway, apron and road in an airport, and more particularly to the embedded structure of embedded objects such as inset light embedded in the reinforced concrete pavement (hereinafter called RC pavement).
BACKGROUND ART
A conventional inset light has a structure as shown in FIG.
4
. This inset light
11
is buried in the runway in an airport, and is roughly composed of a cylindrical base
13
embedded in a concrete pavement
12
, and a lamp body
15
mounted on the base
13
through a lamp body holding member
14
called adjusting ring. The inset light
11
can be embedded easily in a specified position when overlayed concrete
12
is paved on the existing pavement.
In the conventional inset light
11
, however, since the outer circumference of the base
13
is a flat cylindrical body, the coupling force (engagement) between the outer circumference of the base
13
and the concrete pavement
12
is not strong by nature. When a heavy load of aircraft or the like is applied on the top of the light, since the resistance between the cylindrical outer circumference of the base
13
and the concrete pavement
12
is small, the majority of the load generates in the lower part of concentratedly the base
13
. As the load exceeding the strength of the concrete pavement at the lower side of the base
13
is applied from the bottom
13
a
of the base
13
, a large sinking shearing force acts on the inset light portion of the concrete pavement
12
, and thereby the concrete portion of the lower side of the base may be broken, and the light is likely to sink.
At this time, in the concrete pavement
12
beneath the base
13
, simultaneously with the load pressure acting directly from the lower side of the base
13
, a normal stress for direction of bottom (shearing force) acts from the edge portion at the lower end of the base
32
. Therefore, when a heavy load of aircraft or the repetition loading on the inset light
11
, the portion of the concrete pavement
12
supporting the base
13
may be cracked in a short period and be brittle, thereby plunging the inset light
11
.
An object of the invention is to present an embedded structure of embedded objects such as inset lights capable of preventing concentration of the load beneath the base of the inset lights if a heavy load of aircraft or the like is applied.
DISCLOSURE OF THE INVENTION
To solve the problems, a first aspect of the invention relates to an inset light comprising a cylindrical base embedded in a reinforced concrete pavement, and a lamp body held on the top of the base for emitting light to outside of the pavement surface, in which the end portions of the reinforcement of the reinforced concrete pavement and the base are fixed mutually.
A second aspect of the invention relates to the inset light of claim
1
, in which holes are formed in the side wall of the base, and the end portions of the reinforcement are inserted in the holes, and welded and fixed.
A third aspect of the invention relates to an embedded structure of an inset light of claim
1
or
2
being applied to a reinforced structure other than the reinforced concrete pavement.
A fourth aspect of the invention relates to an embedded structure of an inset light of claim
1
,
2
or
3
, being applied to an embedded structure other than the inset light.
REFERENCES:
patent: 207549 (1878-08-01), Powell
patent: 3881697 (1975-05-01), Glaesener
patent: 4140466 (1979-02-01), Snow et al.
patent: 4272799 (1981-06-01), Downing
patent: 4617616 (1986-10-01), Juell et al.
patent: 4622435 (1986-11-01), Trainor et al.
patent: 4879965 (1989-11-01), Valley
patent: 5426267 (1995-06-01), Underhill et al.
patent: 5582477 (1996-12-01), Reinert, Sr.
patent: 5779349 (1998-07-01), Reinert, Sr.
patent: 5785409 (1998-07-01), Reinert, Sr.
patent: 5957573 (1999-09-01), Wedekind et al.
patent: 6164865 (2000-12-01), McCallum
patent: 6196697 (2001-03-01), Reinert, Sr.
patent: 59-50703 (1984-04-01), None
patent: 3-84108 (1991-04-01), None
patent: 8-165671 (1996-06-01), None
patent: 9-209320 (1997-08-01), None
Patent Abstracts of Japan, Publication No. 09209320, Date of Publication Aug. 12, 1997, 2 pages.
English translation of the Abstract of PublicationNo. 3-84108, Date of Publication Apr. 9, 1991, 1 page.
Patent Abstracts of Japan, Publication No. 08165671, Date of Publication Jun. 25, 1996, 1 pages.
Abe Yoichi
Hagiwara Katsuhiko
Kameta Shoichi
Kawabata Shunji
Sato Ryoichi
Addie Raymond W
New Tokyo International Airport Authority
Rosenthal & Osha L.L.P.
Will Thomas B.
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