JP2009287327A - Method for mending core hole in concrete skeleton, mending apparatus for core hole and filler-filling tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for mending a core hole in a concrete skeleton, wherein the core hole made for the purpose of taking a core sample is mended with high reliability by means of filler filling, a mending apparatus for the fore hole and also a filler-filling tool used for the mending. <P>SOLUTION: A core hole 1 bored in a concrete skeleton such as a column, beam or the like is mended by filling a filler 2. The apparatus used for mending the core hole is composed of a rod 4 mounted in the core hole 1, a pressure plate 3 placed at an entrance portion of the core hole 1 and pressing the filler 2 filled in the core hole 1, a pressure nut 6 screwed with the rod 4 for pressurizing the pressure plate 3 into the core hole 1. The pressure nut 6 screwed with the rod 4 is clamped down, and thus the filler 2 filled in the core hole 1 is pressed by the pressure plate 3 from the back, so as to improve filling property of the filler 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for repairing a core hole in a concrete frame, a core hole repair apparatus and a filling material jig used for repairing the core hole, and a core hole formed mainly for sampling purposes during seismic diagnosis. Is used for repairing by filling with a filler.

  In the case of building renovation or seismic reinforcement work, seismic diagnosis of buildings is required, and in recent years, the number of projects for seismic diagnosis of buildings is increasing. In particular, in the case of an RC structure, it may be necessary to confirm the strength of structural concrete such as columns and beams.

  The strength of structural concrete is generally confirmed by collecting core samples by core boring from the walls and / or pillars and beams, which are the main structural members, if there is unavoidable effect. The core hole is repaired by filling with a filler such as concrete or mortar.

Japanese Patent Laid-Open No. 11-326162 JP 2005-320689 A

  However, drilling a core hole in a main structural member such as a column or beam may cause a reduction in strength due to a cross-sectional defect of the member, and although its filling is repaired later, its reliability has been questioned, and in recent years from the owner side The number of cases where cross-sectional defect avoidance of main structural members and structural confirmation of repair methods are required is increasing rapidly.

  In addition, measures such as hitting a mortar or concrete filled in the core hole later with a pushing rod have been taken, but the filling property often lacks certainty. There is also a method of filling the grout material, but it is not practical because it costs much more than using ordinary mortar or concrete.

  The present invention has been made in view of such circumstances, and a method for repairing a core hole in a concrete frame that can reliably and inexpensively repair a core hole formed by a core boring, and repair of the core hole. An object of the present invention is to provide a filling material filling jig used in a repairing method for an apparatus and a core hole.

  The method for repairing a core hole in a concrete frame according to claim 1 is a method for repairing a core hole in a concrete frame in which the core hole provided in the concrete frame is repaired by filling with a filler, and a rod is inserted into the core hole. And a step of filling the core hole with a filler, and a step of applying a reaction force to the rod and pressing a pressure plate into the core hole to pressurize the filler in the core hole. It is a feature.

  The present invention mainly repairs the core hole formed by core boring at the time of earthquake resistance diagnosis by simply filling mortar or concrete, filling the core hole with a filler, and then pressurizing the core hole, The voids are eliminated and the filler is densely filled to improve the structural reliability after repair.

  In this case, it is preferable to use, for example, mortar or the like as the filler, and in particular, a kneaded material with less sagging (the pressed filler does not remain in its shape and collapses).

  The repair device for a core hole of a concrete case according to claim 2 is a repair device for a core hole used when repairing a core hole provided in a concrete case by filling with a filler, and is installed in the core hole. And a pressure plate that is installed at the entrance of the core hole and pressurizes the filler in the core hole, and a pressure nut that is screwed into the rod and pushes the pressure plate into the core hole. It is characterized by comprising.

  The present invention improves the structural reliability after repair by pressurizing the filler filled in the core hole, eliminating excess voids and unfilled locations, and enhancing the filling property of the filler. In particular, the pressure nut is used as a part that pressurizes the filler in the core hole through the pressurizing plate, so that the insufficiently tamped portion of the filler is compensated for, and the filler is filled densely. It becomes possible.

  In addition, by interposing a spring between the pressure plate and the pressure nut, the filler can be more evenly pressurized via the pressure plate.

  The filling material filling jig according to claim 3 is a filling material filling tool used when repairing a core hole provided in a concrete frame by filling with a filling material. A cylindrical body that is formed so as to be inserted into the core hole and pulled out from the core hole, and is inscribed in the cylindrical body, and the filler in the core hole is cored when the cylindrical body is pulled out from the core hole. It is comprised from the cover body formed so that it might hold | maintain in a hole, It is characterized by the above-mentioned.

  In the present invention, the core hole can be filled in a single operation so that the core hole can be repaired efficiently.

  The present invention does not simply fill the core hole formed by core boring with a filler such as concrete or mortar and repairs it, but sufficiently pressurizes the filler in the core hole after filling with a constant pressure. Thus, by eliminating extra voids and unfilled portions in the filler and enhancing the filling property of the filler, there is an effect that the structural reliability after repair can be improved.

  1-3 show an example of the present invention. In the figure, reference numeral 1 denotes a core hole formed by core boring for the purpose of collecting a core sample in a concrete frame such as a column or a beam. Reference numeral 2 denotes a filler filled in the core hole 1 for the purpose of repair.

  Reference numeral 3 is a pressure plate for pressurizing the filler 2 filled in the core hole 1, and the pressure plate 3 is made of wood, metal, hard synthetic resin, or the like and has a diameter slightly smaller than the inner diameter of the core hole 1. It is formed in a disc shape.

  A through-hole 3 a through which a rod 4 described later passes is formed in the center of the pressure plate 3. In use, the pressure plate 3 is attached to the entrance of the core hole 1 with the rod 4 passing through the through hole 3a. One or a plurality of air vent holes (not shown) may be formed in the peripheral edge of the pressure plate.

  Reference numeral 4 denotes a rod for receiving a reaction force when the pressure plate 3 is pushed into the core hole 1. The rod 4 is formed with a male screw and a screw rod formed slightly longer than the depth of the core hole 1. It has been.

  In use, the rod 4 is installed at substantially the center of the core hole 1, and the tip 4 a is fixed to the bottom of the core hole 1 via an anchor 5 embedded in the bottom of the core hole 1. The anchor 5 is driven into the bottom of the core hole 1 in use.

  Reference numeral 6 denotes a pressure nut for taking a reaction force on the rod 4 and pushing the pressure plate 3 into the core hole 1, and the pressure nut 6 is screwed to the reaction force receiving rod 4 in use, and The pressure plate 3 is pushed into the core hole 1 via the spring 7 by tightening the pressure nut 6.

  The spring 7 is used to apply the pressure by the pressurizing nut 6 evenly to the filler 2 in the core hole 1 through the pressurizing plate 3.

  FIGS. 2A and 2B show a jig for filling the filler 2 into the core hole 1, and is composed of a cylindrical body 8 and a lid body 9. The cylindrical body 8 is formed in a cylindrical shape that can be inserted into the core hole 1, and a slit 8 a that is continuous in the axial direction is formed on one side or both sides thereof. Further, as shown in FIG. 2B, a gripping portion 8c is projected from the rear end portion as necessary.

  The lid body 9 is formed to be slightly smaller in diameter than the inner diameter of the cylindrical body 8, a through hole 9 a through which the rod 4 passes is formed at the center, and a slide projecting piece 9 b is projected from the side.

  In use, the cylindrical body 8 is inserted into the core hole 1 with the filler 2 inserted therein, and is pulled out leaving the filler 2 in the core hole 1. In use, the lid 9 is inscribed in the cylindrical body 8 by allowing the rod 4 to pass through the through hole 9 a and engaging the slide protrusion 9 b with the slit 8 a of the cylindrical body 8.

  Further, the lid body 9 is pressed against the entrance of the core hole 1 when the cylindrical body 8 a is pulled out from the core hole 1, so that the filler 2 in the core hole 1 is filled with the cylindrical body 8 so as not to come out. It serves to hold the material 2 in the core hole 1.

  Next, a method for repairing a core hole formed by core boring in such a configuration will be described.

  First, the reaction force receiving rod 4 is inserted into the core hole 1, and the tip 4 a is coupled to the anchor 5 that is back-filled at the bottom of the core hole 1.

  Next, the filler 2 is filled into the core hole 1. For filling the filler 2, a filling jig shown in FIGS. 2 (a) and 2 (b) is used.

  The filling method will be described. The lid body 9 is inscribed in the cylindrical body 8. Then, the filler 2 is packed into the cylindrical body 8 with the lid body 9 at the bottom. Next, the cylindrical body 8 filled with the filler 2 is inserted into the core hole 1. At that time, the rod 4 is passed through the through hole 9 a formed in the center of the lid body 9.

  Next, the cylindrical body 8 is pulled out from the core hole 1 by pressing the lid 9 against the entrance of the core hole 1 so that the filler 2 in the core hole 1 does not come out. Thus, the filling of the filler 2 is completed.

  Next, the pressure plate 3, the spring 7, and the pressure nut 6 are attached to the rod 4. Then, the filler 2 in the core hole 1 is pressurized by tightening the pressure nut 6 and gradually pushing the pressure plate 3 into the core hole 1.

  At that time, if the pressure plate 3 having a small hole at the peripheral edge is used, the air or excess water in the filler 2 can be quickly discharged from the periphery of the pressure plate 3.

  When the filler 2 in the core hole 1 is cured and develops the required strength, the pressing nut 6, the spring 7 and the pressing plate 3 are removed. The portion protruding from the core hole 1 of the rod 4 is cut and finished with a surface.

  This completes the repair of the core hole. The pressure plate 3, the pressure nut 6 and the spring 7 can be used repeatedly.

  FIGS. 4A to 4F show a core hole repair method performed without using the jig shown in FIGS. 2A and 2B, and the construction procedure will be described below. In this repair method, a pushing jig 10 as shown in FIGS. 5 and 6 is used as a jig for filling the filler 2 into the core hole 1.

  The pushing jig 10 includes a pushing plate 10a that can be inscribed in the core hole 1 and a cylindrical handle 10b that protrudes from a central portion on one side of the pushing plate 10a.

  The pushing plate 10a is made of wood, a steel plate, a hard resin plate or the like, and a through hole 10c through which the rod 4 can penetrate is formed at the center. The handle 10b is formed of a hard resin tube such as a steel tube or a vinyl chloride tube through which the rod 4 can penetrate, and is formed in a columnar shape or a truncated cone shape.

  First, the reaction force receiving rod 4 is inserted into the core hole 1, and the tip 4 a is coupled to the anchor 5 that is back-filled at the bottom of the core hole 1.

  Next, the filler 2 is filled into the core hole 1. At that time, the filler 2 is filled in a plurality of times. Further, the filler 2 is carefully rolled by the pressing jig 10 every time. The filling amount of the filler 2 per one time is set to a depth of about 40 to 50 mm, and the filling is completed about 4 to 5 times.

  Further, when the pushing jig 10 is pulled out every time, the pushing jig 10 is pulled out while rotating in the core hole 1 so that the filler 2 does not adhere to the pushing plate 10a.

  When the filling of the filler 2 is completed in this way, the pressure plate 3, the spring 7, and the pressure nut 6 are then attached to the rod 4. Then, the filler 2 in the core hole 1 is pressurized by tightening the pressure nut 6 and gradually pushing the pressure plate 3 into the hole 1.

  At that time, if a pressure plate having a small hole at the peripheral edge is used, air and excess water in the filler 2 can be quickly discharged from the periphery of the pressure plate 3 and the core hole 1 is filled. The tightening condition of the material 2 can be confirmed visually.

  When the filler 2 in the core hole 1 is cured and reaches the required strength, the pressing nut 6, the spring 7 and the pressing plate 3 are removed. The protruding part of the rod 4 is cut and surface-finished.

  The present invention can reliably and efficiently repair a core hole formed in a concrete frame such as a column or a beam.

It is a disassembled perspective view of the repair apparatus used for repair of a core hole. (A), (b) is a perspective view which shows an example of the filling jig for filling a filler in a core hole. It is process drawing which shows the construction procedure of a repair method. It is process drawing which shows the construction procedure of another repair method. An example of the pushing jig | tool for pushing in the filler with which it filled in the core hole is shown, (a) is a partially broken front view, (b) is a side view. An example of the pushing jig | tool for pushing in the filler with which it filled in the core hole is shown, (a) is a partially broken front view, (b) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core hole 2 Filler 3 Pressure plate 3a Through-hole 4 Rod 5 Anchor 6 Pressurizing nut 7 Spring 8 Cylindrical body 8a Slit 8b Grip part 9 Lid 9a Through-hole 9b Slide protrusion 10 Pushing jig
10a Pushing plate
10b Handle
10c Through hole

Claims (3)

  A method of repairing a core hole of a concrete casing, wherein the core hole provided in the concrete casing is repaired by filling with a filler, the step of attaching a rod in the core hole, and the step of filling a filler in the core hole And a method of repairing the core hole of the concrete frame, comprising: a step of applying a reaction force to the rod and pressing a pressure plate into the core hole to pressurize the filler in the core hole.   An apparatus for repairing a core hole of a concrete frame used for repairing a core hole of a concrete frame for repairing the core hole provided in the concrete frame by filling with a filler, the rod mounted in the core hole, and the core A pressure plate that is installed at the entrance of the hole and pressurizes the filler in the core hole; and a pressure nut that is screwed into the rod and pushes the pressure plate into the core hole. A device for repairing a core hole in a concrete frame characterized by A filling material filling tool used when a core hole provided in a concrete frame is repaired by filling with a filler so that the filler is inserted into the core hole and pulled out of the core hole. The formed cylindrical body, and inscribed in the cylindrical body, are formed so as to hold the filler placed in the core hole in the core hole when the cylindrical body is pulled out from the core hole. And a filler filling jig characterized by comprising a lid.

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