JP2008261153A - Reinforcing method of concrete skeleton - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate reinforcement of an existing concrete skeleton, for example, even when it is difficult to secure a sufficient work space around the concrete skeleton. <P>SOLUTION: In the reinforcing method of the concrete skeleton in which an anchor bar 3 is inserted into an anchor insertion hole h formed in the concrete skeleton 1 and is fixed for reinforcement, the anchor bar 3 comprises a plurality of hollow reinforcing bars 31 and cylindrical couplers 32 connecting them. A drilling bit 4 is fitted to a front end part of each of the hollow reinforcing bars 31 which are arranged at the forefront of the plurality of the hollow reinforcing bars 31, and the anchor insertion hole h is drilled with the bit 4. After the plurality of the hollow reinforcing bars 31 are inserted into the anchor insertion hole h while sequentially connecting the hollow reinforcing bars 31 by the couplers 32, the anchor insertion hole h is filled with an anchoring material g through the hollow reinforcing bars 31 and the hollow parts of the cylindrical couplers 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for reinforcing a concrete frame applied to, for example, repairing and reinforcing a concrete frame in an existing concrete building or structure, etc., or seismic reinforcement.

  Conventionally, for example, when reinforcing a concrete frame such as a column or beam in an existing concrete building or structure, as shown in Patent Document 1 below, the main bars adjacent to the surface on the opposite side from one side of the column or beam Proposed to increase the amount of reinforcing bars in the concrete frame and thereby increase the shear strength by forming anchor insertion holes near the position and inserting anchor bars with fixing materials into the insertion holes and fixing them. Has been.

JP 2000-110365 A

  However, there are many cases where the existing buildings and structures as described above are actually used according to their use, and when the reinforcement method as described above is applied, it is sufficient to surround the concrete frame. It is often difficult to secure a large work space. For example, when constructing an anchor insertion hole or anchor bar as described above in a column or beam of a concrete frame, the length from that surface is at least one side of the column or beam. It is necessary to secure a working space equal to or greater than that, but the surfaces of columns and beams that can be constructed in this way are limited in their own right, and there are other buildings and rooms in the vicinity of the surface. There are many cases where it is difficult to secure a sufficient working space on one side because of the proximity of equipment items.

  Therefore, there are not a few cases where it is difficult or impossible to construct a predetermined depth of drilling work or to construct a sufficiently long anchor bar. In particular, when earthquake-proof reinforcement of a building or a structure is performed, if even one pillar that cannot be constructed is left, the pillar remains fragile, leading to the collapse of the whole. For pillars that support railway overpasses and bridges, even a fragile pillar will affect all lines in the event of an earthquake.

  The present invention has been proposed in view of the above problems, and it is possible to easily reinforce a concrete frame that can be easily constructed even when it is difficult to secure a wide working space around the concrete frame to which the above-described reinforcement method is applied. The purpose is to provide a method of construction.

  In order to achieve the above object, a concrete frame reinforcing method according to the present invention has the following configuration. That is, in a reinforcing method of a concrete frame in which an anchor bar is inserted into an anchor insertion hole formed in the concrete frame and is fixed and reinforced, the anchor bar includes a plurality of hollow reinforcing bars and a cylindrical coupler connecting them. The drilling bit is attached to the front end portion of the hollow reinforcing bar disposed at the foremost portion of the plurality of hollow reinforcing bars, and the anchor insertion hole is drilled with the bit, and the plurality of hollow reinforcing bars are connected to the coupler. And inserting the fixing material into the anchor insertion hole via the hollow reinforcing bar and the hollow portion of the tubular coupler, and solidifying and fixing the fixing material. To do.

  As described above, the anchor bars for reinforcing the concrete frame are composed of a plurality of hollow reinforcing bars and a cylindrical coupler connecting them, and the hollow reinforcing bars arranged at the foremost part among the plurality of hollow reinforcing bars Since a drill bit is attached to the front end and an anchor insertion hole is drilled with the bit, and the plurality of hollow rebars are inserted into the anchor insertion hole while being sequentially connected by the coupler, the concrete to be reinforced Even if there is no large work space around the frame, it can be easily constructed. In addition, since the fixing material for fixing the anchor bars is filled in the anchor insertion hole through the hollow portion of the hollow reinforcing bar and the cylindrical coupler, an injection tube for filling the fixing material, There is an effect that filling can be easily and quickly without separately providing an injection hose or the like.

  Hereinafter, concrete concrete reinforcing methods according to the present invention will be described based on embodiments shown in the drawings. FIG. 1 is a cross-sectional plan view of a concrete frame subjected to a reinforcement method according to the present invention, FIG. 2 is a partially cutaway front view of a hollow reinforcing bar constituting an anchor bar used in the reinforcing method, and FIG. FIG. 4 is a front view of a drilling bit attached to one end of the hollow reinforcing bar.

  In the present embodiment shown in FIG. 1, the column 11 in the existing concrete frame 1 is subjected to seismic reinforcement, and a large number of anchors formed substantially horizontally from one side surface 11a of the column 11 into the column 11 are inserted. Anchor holes 3 each having a predetermined length are inserted into the holes h and fixed by the fixing material g. Each of the anchor bars 3 is formed by connecting a plurality of (three in the illustrated example) hollow reinforcing bars 31 with cylindrical couplers 32 to a predetermined length, and the foremost part of each anchor bar 3 A drilling bit 4 for forming an anchor insertion hole h is attached to the front end portion of the hollow reinforcing bar 31 disposed on the (hole back side). In the figure, 12 indicates a wall.

  The anchor insertion holes h are provided so as not to interfere with the reinforcing bars 2 such as the main bars 21 and the hoop bars 22 embedded in the existing concrete frame 1 as shown in FIG. Each anchor insertion hole h is provided between the adjacent main bars 21 and 21 and between the hoop bars 22 and 22 adjacent in the vertical direction.

  Although the structure of the hollow reinforcing bar 31 and the coupler 32 which comprise the said anchor reinforcement 3 is appropriate, in this embodiment, the thing of the structure shown in FIG. 2 and FIG. 3 is used, respectively. That is, as the hollow rebar 31, as shown in FIG. 2, a deformed screw node hollow rebar having rough rolling screws 31 a and 31 b on both inner and outer peripheral surfaces is used, and as the coupler 32, the inner peripheral surface as shown in FIG. 3. The cylindrical thing which has the internal thread hole 32a screwed together with the said rolling screw 31b is used.

  The length of the hollow rebar 31 may be set as appropriate in consideration of the size of the work space S when the hollow rebar 31 is constructed, and the number of hollow rebars 31 should be constructed when the coupler 32 is connected. What is necessary is just to make it the anchor muscle 3 whole become predetermined length.

  Further, as shown in FIG. 4, the drilling bit 4 has a cross-shaped cutting blade 4a at the tip, and a female screw hole 4b screwed into the rolling screw 31b on the inner peripheral surface on the rear end side. Things are used. In the figure, reference numeral 4c denotes a communication hole having one end communicating with the female screw hole 4b and the other end branched and opened to the outer peripheral surface side of the bit 4.

  In constructing the anchor bars 3 configured as described above on the pillars 11 and the like of the existing concrete frame 1 shown in FIG. 1, the construction is performed using the space around the pillars 11 and the like. As shown in FIG. 5, when there is a space between the fixing member A and the existing fixing member A on one side surface of the column 11 to be replenished, the construction work may be performed with the space as the work space S. An example of the construction process will be described below in order.

  First, as shown in FIG. 5A, in the work space S, the front end of the hollow reinforcing bar 31 that is first inserted into the foremost part on the back side of the hole among the plurality of hollow reinforcing bars 31 constituting the anchor reinforcing bar 3. The drilling bit 4 is attached to the part, and the opposite end is connected to the drilling drill D. The drill D is driven in a state where the tip of the bit 4 is pressed against the surface 11a of the column 11 on the work space S side. As a result, the hollow reinforcing bar 31 functions as a drilling rod, and at the same time as the anchor insertion hole h is drilled into the column 11, the hollow reinforcing bar 31 is inserted into the anchor insertion hole h. Although the drilling bit 4 is screwed in the illustrated example, it may be integrally welded to the leading hollow reinforcing bar 31 in advance.

  When the substantially entire length excluding the rear end portion of the hollow reinforcing bar 31 is inserted into the anchor insertion hole h, the drill D is once removed from the hollow reinforcing bar 31, and the rear end portion of the hollow reinforcing bar 31 (the left end in FIG. 5). 5), another hollow reinforcing bar 31 is connected via a coupler 32 as shown in FIG. Next, by reconnecting and driving the drill D to the rear end portion of the connected hollow reinforcing bar 31, the anchor inserting hole h is continuously drilled, and at the same time, the hollow reinforcing bar 31 is inserted into the anchor inserting hole h. To go.

  In this way, while the hollow reinforcing bars 31 are sequentially connected by the coupler 32, the anchor insertion holes h are drilled, and at the same time, the hollow reinforcing bars 31 are inserted into the insertion holes h. As shown in FIG. The hollow reinforcing bars 31 are sequentially connected to form an anchor bar 3 having a predetermined length, and the drilling operation is completed when the entire length or substantially the entire length of the anchor bar 3 is inserted into the anchor insertion hole h. After completion of the drilling operation, the drill D attached to the rear end portion of the anchor bar 3 is removed from the hollow reinforcing bar 31. Note that the drilling bit 4 at the front end of the anchor bar 3 is left in the anchor insertion hole h as it is.

  Next, as shown by an arrow in FIG. 5D, a fixing material such as cement milk or mortar is injected from the hollow portion of the hollow reinforcing bar 31 at the rearmost portion, so that each of the hollow reinforcing bars 31 and the cylindrical coupler 32 are formed. The fixing material is filled into the hollow portion and the surrounding anchor insertion hole h via the anchor muscle 3, and the fixing material guided to the tip portion via the anchor muscle 3 is the anchor muscle 3. Are sequentially discharged and filled into the anchor insertion hole h via the female screw hole 4b and the communication hole 4c of the bit 4 at the tip of the first end. In addition, if the peripheral wall of the hollow reinforcing bar 31 is previously provided with a through hole for discharging the fixing material, the fixing material can be more reliably filled over the entire length.

  When the fixing material filled in the anchor insertion hole h is solidified, the anchor bar 3 composed of the plurality of hollow reinforcing bars 31, the coupler 32, and the drilling bit 4 left as necessary becomes the anchor. It is fixed in the insertion hole h. In this state, a desired tension can be applied to the anchor bar 3 by screwing the nut 5 into the hollow reinforcing bar 31 at the rear end of the anchor bar as shown in FIG. If necessary, a reinforcing material such as a steel plate or a fiber reinforced sheet is attached to or disposed on the surface 11a of the column 11 on the nut 5 side, and is fixed between the surface 11a and the nut 5. Also good.

  As described above, the method for reinforcing a concrete frame according to the present invention includes a predetermined length of the anchor bar 3 inserted into the anchor insertion hole h, a plurality of hollow reinforcing bars 31 shorter than the anchor bar 3 and a cylindrical shape connecting them. The coupler insertion hole h is drilled by the drilling bit 4 attached to the foremost hollow rebar 31 and the plurality of hollow rebars 31 are sequentially connected by the coupler 32 into the anchor insertion hole. Since it is inserted, it can be easily and quickly constructed without a large work space around the concrete frame to be reinforced.

  Further, the fixing material g for fixing the anchor bars 3 is inserted into the anchor bars around the hollow reinforcing bars 31 and the couplers 32 through the hollow portions of the hollow reinforcing bars 31 and the tubular couplers 32 constituting the anchor bars 3. Since the holes h are filled, the filling can be performed without separately providing an injection tube, an injection hose or the like for filling the fixing material g. Therefore, when using an injection tube, an injection hose, or the like as described above, the diameter of the anchor insertion hole h must be increased by that amount, which increases the labor of drilling work, and the existing rebar at the time of drilling. Although there is a problem that the probability of interference increases and workability and durability decrease, the present invention can eliminate all such problems.

  In addition, although the said embodiment used the atypical screw node hollow reinforcing bar which has the rough rolling screw 31a, 31b on both inner and outer peripheral surfaces as the hollow reinforcing bar 31, not only this but various hollow reinforcing bars can be used, For example, a full screw bolt having a hollow portion inside, a deformed rebar, or the like may be used, and a screw for connection by the coupler 32 may be provided only at the end of the hollow rebar. Further, in the case of the figure, the cylindrical coupler 32 is screwed to the outer peripheral surface side of the hollow reinforcing bar 31, but may be screwed to the inner peripheral surface.

  Moreover, although the said embodiment was constructed from the one side surface 11a of the pillar 11 of the concrete frame 1, if the work space S can be secured, it may be constructed from a plurality of surfaces. Furthermore, although the said embodiment was applied to the pillar 1a of the concrete housing 1, it is also possible to apply to a beam, a wall, and another site | part.

  As described above, according to the method for reinforcing a concrete frame according to the present invention, the anchor bar 3 having a predetermined length is composed of a plurality of hollow reinforcing bars 31 shorter than that and a cylindrical coupler 32 connecting them. Therefore, the construction can be easily performed without a large work space around the concrete frame to be reinforced. In addition, since the fixing material for fixing the anchor bars is filled via the hollow reinforcing bar constituting the anchor bars and a cylindrical coupler, an injection tube, an injection hose, etc. for filling the fixing material, etc. Can be filled easily and quickly without the need for a separate material. As a result, for example, the present invention can be effectively applied to a case where a concrete frame in an existing building or a house is seismically reinforced.

The cross-sectional top view of the concrete frame which constructed the reinforcement construction method by this invention. The partially cutaway front view of the hollow reinforcing bar used by said reinforcement construction method. The longitudinal cross-sectional front view of the said coupler for hollow rebar connection. FIG. 3 is a front view of a drilling bit attached to one end of the hollow reinforcing bar. Explanatory drawing which shows an example of the construction process of the reinforcement construction method by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete frame 11 Column 12 Wall 2 Reinforcement reinforcement 21 Main reinforcement 22 Loop reinforcement 3 Anchor reinforcement 31 Hollow reinforcement 32 Coupler 4 Drilling bit 5 Nut h Anchor insertion hole g Fixing material

Claims (1)

In the reinforcement method of the concrete frame, which is anchored and anchored in the anchor insertion hole formed in the concrete frame,
The anchor bar is composed of a plurality of hollow reinforcing bars and a cylindrical coupler connecting them, and a drilling bit is attached to the front end of the hollow reinforcing bar arranged at the foremost part of the plurality of hollow reinforcing bars And drilling the anchor insertion hole with the bit, and inserting the plurality of hollow rebars into the anchor insertion hole while sequentially connecting with the coupler, and then inserting the anchor through the hollow rebar and the hollow portion of the tubular coupler. A method for reinforcing a concrete frame, characterized in that a fixing material is filled in an insertion hole and solidified to be fixed.

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