Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Three-dimensional space-defining
Reexamination Certificate
2000-03-02
2001-12-18
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Three-dimensional space-defining
C052S514000, C052S167100, C052S749100, C052S698000, C052S649200
Reexamination Certificate
active
06330776
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a structure for reinforcing a concrete member and a reinforcing method which are suitable for reinforcing various concrete members.
BACKGROUND ART
As one conventional method for reinforcing a concrete member having a reinforced concrete structure or a steel framed reinforced concrete structure, such as a column, beam, bent, and stack, there is a method in which a reinforcing sheet made of reinforcing fibers, such as carbon fibers, aramid fibers, glass fibers, or the like is arranged and attached on the surface of the concrete member. In this method, in order to reinforce the concrete member against bending stress applied thereto, the reinforcing sheet is arranged and attached along the concrete member. In order to reinforce the concrete member against shearing stress applied thereto, the reinforcing sheet is arranged and attached so as to wrap around the concrete member.
In order to stably fix the reinforcing sheet onto the surface of the concrete member, an adhesive is often used. However, when the reinforcing sheet is merely attached to the concrete member using an adhesive and the reinforcing sheet (in particular, the edges thereof) peels from the surface of the concrete member due to any reasons, the reinforcing sheet cannot sufficiently exert its reinforcing effects. Therefore, the edges of the reinforcing sheet are reliably joined to the concrete member by joining the edges of the reinforcing sheet using an anchor hammered and joined into the concrete member and a steel plate.
However, the structure for reinforcing a concrete member and the reinforcing method using the reinforcing sheet have the following problems. Hammering the anchor for joining the edges of the reinforcing sheet using an anchor and steel plate requires a great deal of time. In addition, the anchor made of steel has a large diameter. Therefore, when the reinforcing sheet is joined in existing building, there are problems such as noise and vibration occur due to the anchor hammering under constructions. Moreover, the head portions of the anchors or the fitting members for the steel plates protrude from the surface of the concrete member. Therefore, when facings such as facing panel are joined, it is necessary to make and keep a clearance between the surface of the concrete member and the top portion of the anchor or the fitting members using brackets or the like, in order to avoid the top portion of the anchor or fitting members. The execution of this work requires a great deal of time.
Moreover, when the planar concrete members, such as a wall, floor, and the like are desired to be reinforced with the reinforcing sheet, it is impossible to wrap the concrete members similar to columns and beams. When the columns or the beams are integrated with the wall or the slab, the reinforcing sheet also cannot be wraped around the columns or the beams. In these cases, the edges of the reinforcing sheet should be more reliably joined. Therefore, in these cases, the problems are significant.
In order to solve the problems, a method in which the slits
3
are formed in the wall (beam, floor, or the like)
2
joined with the column (or beam)
1
, and the reinforcing sheet
4
is wrapped around the column
1
by passing the reinforcing sheet
4
through the slits
3
, can be expected. Then, the slits
3
are filled with a resin
8
, a mortar, or the like after passing the reinforcing sheet
4
through the slits
3
.
In the structure obtained by this method, the slits
3
are filled with resin or mortar; however, the reinforcing sheet
4
made of a combustible material is uncovered at both surfaces of the wall
2
. Therefore, the fire protecting performance of this structure must be improved by covering the bare reinforcing sheet
4
at at least one surface of the wall
2
with a covering portion
9
formed by coating with a non-combustible material such as mortar, and the like.
However, the coating of the non-combustible material for forming the covering portion
9
requires a great deal of time and great expense. In addition, the covering portion
9
protrudes from the surface of the wall
2
. Therefore, when facings such as facing panel are joined, it is necessary to make and maintain a clearance between the wall and the covering portion
9
using brackets or the like. The problem that the finished size of the structure increases arises.
There is a reinforcing method in which a wall of existing building is reinforced, and whereby the proof stress of existing building is increased, as a method for improving the earthquake resistance of existing building having a reinforced concrete structure. Specifically, concrete is coated on the surface of the wall, a steel plate is attached to the surface of the wall, or a reinforcing unit comprising a brace made of steel is arranged between the beam and the column positioned at the edges of the wall.
However, these reinforcing methods have the problems that they must be executed on a large scale, and long construction periods and great expense cost, are required. In addition, in the reinforcing method in which the steel plate and the reinforcing unit are used, these materials are heavy; therefore, these materials impose burdens on workers. Moreover, a jack is necessary and the problem of increasing the cost for equipment arises. Furthermore, welding at the construction site is necessary. The welding is accompanied by noise; therefore, the construction cannot be executed while the building in use.
In addition, the reinforced wall becomes thicker compared with the wall before the reinforcement; therefore, the room space becomes smaller. The materials used for reinforcing are heavy; therefore, it is necessary to consider problems due to the weight increase while the building is being reinforced. Consequently, these reinforcing methods have problems such as being inefficient.
DISCLOSURE OF INVENTION
A structure for reinforcing a concrete member according to claim
1
is the structure for reinforcing the concrete member characterized in that
a fixing anchor which comprises a plurality of reinforcing fibers such as carbon fibers, aramid fibers, glass fibers, and the like, and a part of which is bundled in the longitudinal direction, is arranged and joined so that at least the bundled portion is joined to the concrete member or the other concrete member surrounding the concrete member, and the unbundled portion is spread along the surface of the concrete member; and
a reinforcing member in the form of a plate or sheet is joined to the concrete member, via the fixing anchor by arranging and attaching to the concrete member, and superposing and joining at least the edges of the reinforcing member to the unbundled portion of the fixing anchor.
According to the structure for reinforcing a concrete member, the edges of the reinforcing member are securely joined to the concrete member by joining the reinforcing member to the concrete member, via the fixing anchor. The peeling of the edges of the reinforcing member can be prevented. It is possible to exert reliably reinforcing effects in the concrete member. Moreover, under a reinforcing construction, forming recesses for attaching the bundled portion of the fixing anchors is only source of the noise and vibration. And the holes have a smaller diameter than the diameter of the conventional anchors made of steel. It is possible to minimize the noise and the vibration. Therefore, it remains possible to easily adopt the structure for reinforcing a concrete member to existing buildings. There is no protrusion at the surface of the reinforcing member. Fixing the facings does not require a great deal of time.
A structure for reinforcing a concrete member according to claim
2
is the structure for reinforcing a concrete member according to claim
1
, characterized in that said reinforcing member is in the form of a sheet and comprises reinforcing fibers such as carbon fibers, aramid fibers, glass fibers, and the like. The reinforcing member has sufficient strength, and nevertheless it is light. Handl
Fujita Tadao
Iketani Jun′ichi
Inada Yasuo
Jinno Yasuo
Saito Hideto
Dorsey Dennis L.
Friedman Carl D.
Nippon Steel Corporation
Nixon & Vanderhye PC
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