JP2012144957A - Hole-in anchor and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hole-in anchor and a construction method thereof, capable of reducing generation of noise, vibration, and dust during construction.SOLUTION: A hole-in anchor 10 for use in integrating both of an existing skeleton 2 and a new construction skeleton 4 to form newly placed concrete comprises a rod-shaped anchor bar 12 and a steel plate 16 through which the anchor bar 12 penetrates to be fixed and which includes a projection 14 projecting toward the new construction skeleton 4. A construction method of the hole-in anchor 10 includes steps of embedding an end of the anchor bar 12 in the existing skeleton 2, disposing the steel plate 16 on the surface 2a of the existing skeleton, and injecting grout in a gap 18 between the anchor bar 12 and the existing skeleton 2.

Description

  The present invention relates to a post-construction anchor and a construction method thereof.

  Conventionally, in the seismic reinforcement work for concrete structures, it is known that anchor bars are placed on an existing frame and fixed and integrated with a new frame such as a seismic wall (for example, see Patent Document 1). In this case, in order to improve the adhesion between the existing frame and the new frame, the surface of the concrete of the existing frame is often roughed.

JP 2002-332750 A

  By the way, since the roughening of the surface of the existing frame is usually performed using an electric pick or the like, since noise and vibration are large and dust is generated, so-called `` construction in a state where the resident is in the building '' “Renovation while staying” is bad because the comfort of living is lost. Moreover, when performing roughening on the under beam, the worker is forced to work while dusting, which is not preferable as a work environment.

  This invention is made | formed in view of the above, Comprising: It aims at providing the post-construction anchor which can reduce generation | occurrence | production of the noise and vibration at the time of construction, and dust, and its construction method.

  In order to solve the above-mentioned problems and achieve the object, the post-construction anchor according to claim 1 of the present invention is a post-construction anchor used to integrate both when the new construction is added to the existing construction. Then, it is characterized by comprising a rod-shaped anchor bar and a steel plate having a protrusion projecting toward the new housing side, the anchor bar penetrating and fixing.

  Moreover, the post-construction anchor according to claim 2 of the present invention is the above-described anchor according to claim 1, wherein the steel plate has a grout injection hole for injecting grout into the gap between the anchor bar and the existing housing. It is provided.

  Further, the post-construction anchor according to claim 3 of the present invention is characterized in that, in the above-described claim 1 or 2, the anchor bar is threaded and the anchor bar and the steel plate are fixed by a nut. To do.

  Moreover, the post-construction anchor construction method according to claim 4 of the present invention is a method of constructing the post-construction anchor according to any one of claims 1 to 3 described above, wherein a new construction is attached to an existing construction. Before the additional striking, one end of the anchor bar is embedded in the existing frame, the steel plate is arranged on the surface of the existing frame, and grout is injected into the gap between the anchor bar and the existing frame. And

  The post-construction anchor construction method according to claim 5 of the present invention is characterized in that, in claim 4 described above, a reinforcing portion is provided around the anchor muscle embedded in the existing frame.

  According to the post-construction anchor according to the present invention, it is a post-construction anchor that is used to integrate both of the existing case when the new case is added to the existing case. Because it consists of a steel plate that is fixed and has projections that project toward the new chassis, the projections on the steel plate enhance the adhesion between the existing chassis and the new chassis, and roughen the surface of the existing chassis. There is an effect that it is possible to reduce the generation of noise / vibration and dust during construction.

  In addition, according to the post-installation anchor construction method according to the present invention, before the new housing is added to the existing housing, one end of the anchor bar is embedded in the existing housing and the steel plate is placed on the surface of the existing housing. Because it is placed and grout is injected into the gap between the anchor bar and the existing housing, it is not necessary to roughen the surface of the existing housing, reducing noise, vibration and dust generation during construction. There is an effect that can be.

FIG. 1 is a cross-sectional view showing an embodiment of a post-construction anchor and its construction method according to the present invention. FIG. 2 is a plan view showing an example of a circular steel plate. FIG. 3 is a plan view showing an example of a rectangular steel plate.

  Embodiments of a post-construction anchor and a construction method thereof according to the present invention will be described below in detail based on the drawings. Note that the present invention is not limited to the embodiments.

  As shown in FIG. 1, the post-construction anchor 10 according to the present invention is used for integrating both of the existing frame 2 and the new frame 4 in the seismic reinforcement work of a concrete structure. is there. The post-construction anchor 10 includes a rod-shaped anchor bar 12 and a steel plate 16 that is disposed in close contact with the surface 2a of the existing housing 2 and through which the anchor bar 12 passes.

  The steel plate 16 is provided with a protrusion 14 that protrudes toward the new housing 4 side. Since this protrusion 14 can be expected to have a dowel effect on the side of the newly installed casing 4, an effect equal to or greater than that obtained by roughening the surface 2 a of the existing casing 2 can be expected.

  Thereby, it is not necessary to carry out the roughening necessary for the integration with the new housing 4 and it is possible to avoid the generation of noise / vibration and dust associated with the roughing work. Therefore, it is possible to reduce noise / vibration and dust generation at the time of additional hammering. In particular, the merit of avoiding the roughing work under the beam or slab is great in terms of the safety and health of the workers.

  Here, the number of protrusions 14 and the length of the anchor bars 12 protruding to the new housing 4 can be appropriately changed according to the size of the steel plate 16 and the diameter of the anchor bars 12. Further, the thickness and shape of the steel plate 16 can be appropriately changed according to the dimensions of the anchor bars 12 and the like.

  A grout injection hole 20 is formed in the steel plate 16. It is possible to inject grout into the gap 18 between the anchor muscle 12 and the existing housing 2 through the grout injection hole 20. The steel plate 16 is disposed in close contact with the existing housing 2 and prevents the grout from leaking out from around the anchor muscle 12. For this reason, the construction quality of the anchor muscle 12 can be improved.

  Further, a part of the anchor bar 12 is threaded, the nut 22 connects the anchor bar 12 and the steel plate 16, and the steel plate 16 is fixed to the existing housing 2 side. By fixing the steel plate 16 with the nut 22, it is possible to easily grout the anchor bars 12 around the beam.

  A reinforcing portion 24 is provided around the anchor muscle 12 near the surface 2a in the existing housing 2. The reinforcing portion 24 is for improving the anchoring performance of the anchor muscle 12 by expanding the control area of the top of the anchor muscle 12, and the periphery of the top of the anchor muscle 12 is replaced with concrete grout. . Since the fixing reinforcement effect is enhanced, it is particularly effective when the concrete strength of the existing frame 2 is low. The grout injection into the reinforcing portion 24 can be performed through the grout injection hole 20 of the steel plate 16.

  In the above embodiment, the steel plate 16 may be a circular or rectangular plate as shown in FIGS. Although the size of the steel plate 16 varies depending on the diameter of the anchor bar 12, for example, when the diameter of the anchor bar 12 is about φ16 mm, a steel plate having a size of about φ150 mm or 150 mm square can be used. Its thickness can be about 5 to 6 mm. Two or more grout injection holes 20 are preferably opened, and the filled state can be confirmed by overflowing the injected grout from the holes 20.

  In addition, the post-installation anchor construction method according to the present invention includes embedding one end of the anchor bar 12 in the existing housing 2 and adding the steel plate 16 to the existing housing 2 before the concrete of the new housing 4 is added to the existing housing 2. The post-construction anchor 10 is constructed by injecting the grout into the gap 18 between the anchor muscle 12 and the existing housing 2. By doing so, the steel plate 16 having the protrusions 14 is sandwiched between the existing housing 2 and the new housing 4 so that both are integrated, and the conventional roughing operation is unnecessary. Can be.

  As described above, according to the post-construction anchor according to the present invention, it is a post-construction anchor used to integrate both when the new construction is added to the existing construction. The anchor bar penetrates and is fixed, and consists of a steel plate with protrusions that project toward the new housing side, so the adhesion of the existing housing and the new housing is enhanced by the projections on the steel plate, and the surface of the existing housing However, it is possible to reduce the generation of noise / vibration and dust during construction.

  In addition, according to the post-installation anchor construction method according to the present invention, before the new housing is added to the existing housing, one end of the anchor bar is embedded in the existing housing and the steel plate is placed on the surface of the existing housing. Because it is placed and grout is injected into the gap between the anchor bar and the existing housing, it is not necessary to roughen the surface of the existing housing, reducing noise, vibration and dust generation during construction. Can do.

  As described above, the post-construction anchor and the construction method according to the present invention are useful for improving the workability of anchor construction frequently used in the seismic reinforcement work of concrete structures and the roughing of existing structures. In particular, there is no need to tamper with the surface of the existing housing, and no noise, vibration, or dust is generated during the construction. Suitable for

2 Existing housing 4 New housing 2a Surface 10 Post-installed anchor 12 Anchor bar 14 Protrusion 16 Steel plate 18 Gap 20 Grout injection hole 22 Nut 24 Reinforcement part

Claims (5)

It is a post-construction anchor that is used to integrate both sides when adding a new case to an existing case,
A post-construction anchor comprising a rod-shaped anchor bar and a steel plate having a protrusion projecting toward the new housing side, the anchor bar penetrating and fixing.   The post-construction anchor according to claim 1, wherein a grout injection hole for injecting grout into the gap between the anchor bar and the existing housing is provided in the steel plate.   The post-construction anchor according to claim 1 or 2, wherein the anchor bar is threaded and the anchor bar and the steel plate are fixed by a nut. A method for constructing a post-construction anchor according to any one of claims 1 to 3,
Before adding a new case to the existing case, bury one end of the anchor bars in the existing case and place the steel plate on the surface of the existing case, and grout the gap between the anchor bars and the existing case. A method for constructing a post-construction anchor characterized by injecting a filler.   The post-construction anchor construction method according to claim 4, wherein a reinforcing portion is provided around the anchor bar embedded in the existing frame.

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