JP2019060111A - Repair method of building foundation and foundation structure of building - Google Patents

Abstract

To effectively repair defective portions in a building foundation to increase the earthquake resistance of the building and enable the building to be used safely.SOLUTION: A reinforcing member 4 installed in a defective portion 2 is provided with a flat plate member 41 having a through hole 411 and a new anchor 42 disposed via the through hole 411. An anchor bolt 3 is embedded in a building foundation 1, and the flat plate member 41 is attached to the anchor bolt 3. The new anchor 42 is driven into the through hole 411 of the flat plate member 41, and the reinforcing member 4 is repaired in a state of being embedded in the building foundation 1. The flat plate member 41 and the new anchor 42 are both embedded so as to intersect the anchor bolt 3.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a repair method applied to a building foundation and a foundation structure of a building configured by the repair method.

  On the foundation of a building such as a house, anchor bolts are embedded for securing upper structures such as column bases and foundations to reinforced concrete foundations. When an earthquake occurs, the entire building shakes, and vertical force (tensile force) and horizontal force (shear force) act on anchor bolts embedded in the foundation. The fixing force between the anchor bolt embedded in the foundation and the concrete that constitutes the foundation resists such vertical force and horizontal force, and the earthquake resistance of the upper structure is secured.

  According to the current Building Standard Law, various provisions have been made to ensure building safety even during normal earthquakes. However, in existing buildings built before that, cracks and flakes on concrete foundations due to large earthquakes etc. There was an aspect which can not deny the possibility of occurring. For example, as shown in FIG. 12, a large horizontal force acts on the anchor bolt 3 connected to the upper structure (not shown), causing a crack or peeling off of the building foundation 1 and causing a defect. It was concerned that 2 would occur.

  For example, according to Patent Document 1, when a repair is required on a concrete foundation due to an earthquake or the like, a channel is fastened to the concrete foundation, and the inner and outer connecting plates connected to the channel are fastened by bolts to reinforce the foundation Is disclosed. In this repair method, it is intended to secure the strength against the next earthquake and make it possible to use the existing building safely again by sandwiching the concrete foundation with the structural material from both inside and outside.

Unexamined-Japanese-Patent No. 2006-161529

  Although the technology disclosed in Patent Document 1 makes it possible to use the building safely again, large-scale structural materials are attached to the inner and outer surfaces of the concrete foundation. Installation space and work space at the time of construction are required, and the appearance of the building is not a desirable finish.

  In addition, if a large earthquake that might occur in the future is assumed, not only the defect portion is restored to the original shape, but the repair operation is performed simultaneously with the repair operation so that the repaired portion is not damaged again. Reinforcement is desirable.

  In view of the problems as described above, the present invention is a new building foundation that effectively repairs defects in the foundation of the building to enhance the strength of the building and enables the building to be used safely. It provides the repair method and the foundation structure of the building.

  The solution according to the present invention for achieving the above object is directed to a method of repairing a building foundation in which a defect portion generated in a building foundation is repaired using a reinforcing member. An anchor bolt is embedded in the building foundation, and the reinforcing member has a flat plate member provided with a through hole, and a new anchor inserted into the through hole. As the repair method, a drilling step of drilling the embedded hole of the new anchor in the lateral direction crossing the anchor bolt in the vicinity of the anchor bolt in a state where the lower end portion is embedded in the defective portion; And the other end of the new anchor is inserted through the through hole of the flat member, and the anchor installation step of burying one end of the new anchor and installing the new anchor in the defect portion; The flat plate member is fixed in a state of being in contact with the anchor bolt, and the flat plate member is installed in the defective portion. After the respective steps, the defective portion is restored to its original shape with a repair agent. And a process including.

  By this specific matter, it is possible to repair the original shape while reinforcing the defective portion generated in the building foundation by the reinforcing member, and to improve the strength performance in the vicinity of the embedded anchor bolt than before the repair. Is possible.

  More specifically, as the repair method of the building foundation, the flat plate member of the reinforcing member is provided with a plurality of through holes, and a plurality of pre-newly installed anchors are provided. It is preferable that the embedded holes are respectively provided between the anchor bolts and on the side of the anchor bolt with respect to a plurality of embedded adjacent anchor bolts. Further, in the flat plate member installing step, the flat plate member is preferably disposed so as to straddle a plurality of anchor bolts.

  As a result, it becomes possible to correspond to a plurality of embedded anchor bolts with one reinforcing member, and it is possible to repair while repairing the various forms of the defect portion.

  The foundation structure of a building repaired by the above-described building foundation repair method is also a category of the technical idea of the present invention. That is, in the foundation structure of a building using the reinforcing member, the reinforcing member includes a flat plate member having a through hole, and a new anchor disposed through the through hole, and the building foundation is anchored The lower end of the bolt is buried. The flat plate member is attached to the buried portion of the anchor bolt and the new anchor is driven through the through hole of the flat plate member, and the reinforcing member is buried in a building foundation, the flat plate member The embedded anchor is embedded so that one surface faces the anchor bolt and intersects the anchor bolt, and the new anchor is embedded and configured to intersect the anchor bolt.

  Due to this particular matter, the horizontal force acting on the anchor bolt embedded in the building foundation can be borne by the reinforcing member embedded in such a way as to be added to the anchor bolt and cross it, and the strength performance in the building foundation It is possible to raise

  In this invention, it is set as the structure which repairs the defect | deletion part which arose in the building foundation using the reinforcement member which has the flat member in which the through-hole was provided, and the new anchor inserted in the said through-hole. Thus, the flat plate member is embedded such that one surface thereof faces the anchor bolt and intersects the anchor bolt, and the new anchor is embedded in a transverse direction intersecting the anchor bolt. Thus, the structure can be made stronger than before repair, and it is possible to suppress the occurrence of breakage around the anchor bolt.

It is a perspective view which shows an example of the reinforcement member used in the repair construction method of the building foundation which concerns on embodiment of this invention. In the repair method of a building foundation concerning an embodiment of the present invention, it is a perspective view showing an example of a defective part which becomes a repair object part. It is a perspective view which shows 1 process of the repair construction method of the building foundation which concerns on embodiment. It is explanatory drawing which shows the process shown in FIG. 3 by the cross section of a building foundation. It is explanatory drawing which shows the following process of FIG. 4 by the cross section of a building foundation. It is explanatory drawing which shows the following process of FIG. 5 by the cross section of a building foundation. It is a perspective view which shows the following process of FIG. It is a perspective view which shows the following process of FIG. It is a perspective view which shows the repair method of the building foundation which concerns on other embodiment. It is a perspective view which shows the other example of the said reinforcement member. It is a perspective view which shows an example of the repair construction method of the building foundation using the reinforcement member shown in FIG. It is a perspective view explaining the defect part which may arise in the corner of a building foundation.

  Hereinafter, a repair method of a building foundation and a foundation structure of a building according to an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, it is assumed that the building foundation is partially lost due to the action of a relatively large horizontal force due to a large earthquake or the like even if the building has sufficient seismic strength. For example, as shown in FIG. 12, even if there is a defect 2 at the top end of the raised corner of the building foundation 1, there is little damage to the building itself, and it is often possible to continue using the building . However, for residents and users of buildings, by seeing defect 2 on a daily basis, they feel anxious about the continued use of the building, and in the case of the repair, it is only necessary to restore it to its original shape. It is desirable that reinforcement of the defect portion 2 be simultaneously applied.

  In the present embodiment, the cross-sectional repair of the defective portion 2 is repaired using the reinforcing member 4 shown in FIG. 1 and the like, and the repair method of the building foundation 1 and its foundation structure capable of securing the required strength performance are described. Do.

(Reinforcement member)
FIG. 1 is a perspective view showing an example of a reinforcing member 4 used in a repair method of a building foundation 1.

  The reinforcing member 4 includes a flat member 41 formed of a strip-like metal plate, a new anchor 42, and a nut 43 screwed to the new anchor 42.

  The flat plate member 41 is a metal plate-like body made of, for example, a steel material, and is formed in a rectangular shape. In the illustrated embodiment, the flat plate member 41 is formed in a horizontally long rectangular shape, and two elongated through holes 411 are arranged in parallel along the longitudinal direction. The new anchors 42 are respectively inserted into the through holes 411.

  The through hole 411 provided in the flat plate member 41 is not limited to the long hole shape, but by being long hole shape, it is possible to adjust the insertion position of the new anchor 42 in the through hole 411 .

  The new anchor 42 is a rod-like member, and is used to fix the flat plate member 41 by being driven into the building foundation 1. For the new anchor 42, for example, a cut-off full screw bolt, a cut-off deformed bar steel or the like can be suitably used, and it is preferable that the anchor bolt has an uneven portion on the outer surface.

  The nut 43 and the packing material 44 are attached to the shaft portion of the new anchor 42. A nut 43 is provided on one shaft portion of the new anchor 42 with the flat plate member 41 interposed therebetween, and a packing material 44 is screwed to the other shaft portion. The packing material 44 has a through hole through which the new anchor 42 penetrates in the center. For the packing material 44, a flat washer made of synthetic resin such as polyvinyl chloride resin can be used, for example.

  The new anchor 42 is to be driven into and fixed to the building foundation 1 and it is also possible to apply a post-construction anchor. In that case, an adhesion type anchor (chemical anchor) can be used as a post-construction anchor, and for example, a capsule containing an adhesive solution having a two-component mixing and fixing property is inserted into a hole drilled in the building foundation 1 and a new anchor The new anchor 42 is adhesively fixed by injecting 42 and breaking the capsule and mixing and solidifying the two solutions. Moreover, the mechanical anchor by which a front-end | tip is expanded and it fixes to the building foundation 1 can also be used as a post-construction anchor.

  In the reinforcing member 4, the flat plate member 41 may have any shape as long as it is a plate-like body provided with the through holes 411. Other embodiments of the reinforcing member 4 will be described later.

(Repairing method of building foundation)
2-8 has shown about the repair construction method of the building foundation 1 which repairs the defect | deletion part 2 using the said reinforcement member 4. FIG.

  In this embodiment, among the direct foundations of reinforced concrete structure applied to a building such as a house, a foundation structure in a footing foundation such as a cloth foundation (continuous foundation) will be described. In each of the drawings to be referred to, the concrete constituting the building foundation 1 and the self-leveling material provided on the upper layer of the concrete and having self-smoothness are integrally shown without distinction, and the upper side of the building foundation 1 The upper structure present in is omitted.

  A plurality of anchor bolts 3 are embedded in the building foundation 1. The upper part of the anchor bolt 3 protrudes above the top end of the building foundation 1 and is joined to an upper structure such as a column base or a base (not shown). The lower part of the anchor bolt 3 is vertically embedded in the building foundation 1.

  As shown in FIG. 2, two existing anchor bolts 3 are disposed at the corner where the building foundation 1 intersects at right angles. The defect part 2 which arose is an exfoliation place of concrete which constitutes building foundation 1, and has large and small irregular unevenness on the surface. The embedded portion of the anchor bolt 3 may be partially exposed on the surface of the defect portion 2.

  In order to start the repair work, the fragile portion of the surface of the defect portion 2 is removed by striking with Bishan hammer or washing with high pressure water. If necessary, a space for installing the flat plate member 41 of the reinforcing member 4 is formed by pinching the surface of the defect portion 2. Thereby, at least the upper half of the anchor bolt 3 embedded in the protruding corner is exposed to the surface of the defect 2 (preparation step).

Drilling Step Subsequently, the reinforcing member 4 is attached to the outside of the anchor bolt 3 in the defect portion 2. First, as shown in FIG. 3, the embedding hole 5 for installing the new anchor 42 of the reinforcing member 4 is bored (piercing step).

  In this case, the concrete constituting the building foundation 1 is cut into a substantially cylindrical shape from the surface side of the defect portion 2 to form the embedded hole 5. For example, the surface of the defect portion 2 is perforated by a drill or the like, and the cutting powder is removed by suction or air blow. Thereafter, a metal brush is inserted into the embedded hole 5 to clean the inside of the hole.

  The embedding hole 5 is provided, for example, at a height of 30 to 50 mm below the top end of the building foundation 1. As shown, when two anchor bolts 3 are provided in parallel, two embedded holes 5 are respectively drilled between the two anchor bolts 3 and in the vicinity of each anchor bolt 3. Do.

  As shown in FIG. 4, each embedded hole 5 is preferably drilled in the horizontal direction intersecting each anchor bolt 3 in the depth direction of the building foundation 1. The size of the embedded hole 5 is determined by the size of the defective portion 2 and the type and number of the anchor bolts 3 and the like. For example, the hole diameter is preferably 10 to 15 mm and the hole depth is preferably 70 to 100 mm. Thereby, two embedded holes 5 are formed side by side on the surface of the defect 2.

-Anchor installation process Subsequently, the new anchor 42 is installed in the embedding hole 5 (anchor installation process). In the illustrated form, an adhesive post-construction anchor is used as the new anchor 42.

  As shown in FIG. 5, first, the chemical capsule 6 is inserted and set in the embedding hole 5. A packing material 44 is attached to the shaft portion of the new anchor 42 at a position corresponding to the depth (depth dimension) of the embedding hole 5.

  Next, one end of the new anchor 42 is placed in the embedding hole 5, and the new anchor 42 is inserted into the embedding hole 5 while being driven or rotated. By inserting the new anchor 42, the chemical capsule 6 in the embedded hole 5 is broken, and the adhesive liquid inside is filled in the embedded hole 5. At this time, the packing material 44 attached to the shaft portion of the new anchor 42 blocks the embedding hole 5 to prevent the adhesive from flowing out.

  The new anchor 42 is integrally fixed to the embedded hole 5 by hardening the adhesive liquid of the chemical capsule 6. Thereby, two new anchors 42 can be installed in the defect portion 2. Since the embedding hole 5 is formed in the horizontal direction intersecting the anchor bolt 3, the new anchor 42 can be embedded so as to intersect the anchor bolt 3 in the horizontal direction.

-Flat plate member installation process Subsequently, the flat plate member 41 of the reinforcement member 4 is installed in the defect part 2 (flat plate member installation process). As shown in FIG. 6, on the surface of the defect portion 2, a new anchor 42 is provided so as to be close to the anchor bolt 3. The flat plate member 41 is fixed to the new anchor 42.

  Specifically, the other end of the new anchor 42 is inserted into each through hole 411 of the flat plate member 41. In this case, the flat plate member 41 is attached so as to straddle laterally with respect to the two anchor bolts 3 arranged in parallel. Since the through holes 411 of the flat plate member 41 are formed in a long hole shape, the installation position of the flat plate member 41 can be adjusted within the opening range of the two through holes 411.

  Thereafter, as shown in FIG. 7, the flat plate member 41 is brought into contact with the exposed anchor bolts 3 and 3, and in this state, the nut 43 is screwed to the new anchor 42 and the nut 43 is tightened. Thereby, the flat plate member 41 is fixed to the surface of the defect portion 2. In the defect portion 2, one reinforcing member 4 is attached to the two anchor bolts 3, and the anchor bolt 3 is pressed from the outside.

Then, as shown in FIG. 8, the mold 7 is disposed around the defect portion 2 and the repair agent 8 is cast. Thereby, as shown with a broken line in FIG. 4, the top end shape of the building foundation 1 is restored to the original shape. When the defect portion 2 is small, the repair agent 8 may be applied to the defect portion 2 for repair without installing the mold 7. As the repair agent 8, an appropriate concrete repair agent such as mortar or other grout filler can be used.

  After the repair agent 8 hardens, the mold 7 is removed to complete the repair work of the raised corner of the building foundation 1. The building foundation 1 having undergone each of the above-described repair steps is a reinforcing member in a state in which the flat plate member 41 is attached to the anchor bolt 3 and the new anchor 42 is horizontally driven through the through hole 411 of the flat plate member 41. 4 has a foundation structure embedded. The flat plate member 41 is embedded so as to cross the anchor bolt 3 in a state in which one surface is opposed to the anchor bolt 3.

  As a result, the reinforcing member 4 is fixed to the building foundation 1, and the anchor bolt 3 is physically pressed from the outer side of the exit corner to supplement the strength performance of the building foundation 1. The horizontal force acting on the building is properly transmitted to the concrete constituting the building foundation 1 via the anchor bolt 3. Therefore, in the building foundation 1 having such a structure, the anchor bolt 3 can be provided with sufficient pull-out resistance and shear resistance to make it difficult to cause breakage around the projected corner after repair again. In addition, since the raised corner of the repaired building foundation 1 has an appearance similar to that before breakage, it does not impair the aesthetic appearance of the building, and the repairing operation is also performed without impairing the habitability of the building. Is made possible.

(Other embodiments)
The repair method of the building foundation 1 according to the present invention, the reinforcing member 4 and the foundation structure of the building using these can be implemented in various forms other than the above embodiment.

  The repairing method of the building foundation 1 is not limited to the corner, and can be applied to various parts of the building foundation 1. For example, as shown in FIG. 9, it can be suitably implemented also at a T-shaped intersection of the building foundation 1 or the like.

  In this form, the building foundation 1 is erected so as to cross in a substantially T shape, and has two adjacent inner corners. Two anchor bolts 3 are embedded near the T-shaped intersection. Also in this case, similarly to the above, the reinforcing member 4 is installed in the defect portion 2 by the drilling process, the anchor installation process, and the flat plate member installation process, and the repair agent 8 is used to restore the defect area 2 to the original shape. Thereby, the strength performance can be compensated at the defect portion 2 for repair.

  The defective portion 2 to which the repair method of the building foundation 1 is applied is not limited to the location where the two anchor bolts 3 are embedded in proximity to each other, and even if the number of the embedded anchor bolts 3 is one 3 Even if it is more than one book, repair is possible similarly.

  Further, in the reinforcing member 4, the number of the through holes 411 of the flat plate member 41 and the number of the new anchors 42 are not limited to those in the above embodiment. The number of the through holes 411 of the flat plate member 41 may be one or plural. Further, the number of new anchors 42 inserted into one through hole 411 is not limited to one, and a plurality of new anchors 42 may be inserted into one long hole-like through hole 411. . It is preferable to select the size and thickness of the flat plate member 41, the outer diameter of the new anchor 42, and the like according to the number of the through holes 411 and the number of the new anchors 42.

  As shown in FIG. 10, the reinforcing member 4 is configured to include a flat plate member 41 having one long hole-like through hole 411 and one new anchor 42 inserted into the through hole 411. It is also good. When repairing the defect portion 2 using such a reinforcing member 4, as shown in FIG. 11, the flat plate member 41 is applied to the two anchor bolts 3 exposed on the surface of the defect portion 2 at equal positions. The new anchor 42 is driven into an intermediate portion which is approximately equally spaced from the two anchor bolts 3. Thereby, the strength performance can be compensated at the defect portion 2 for repair.

  In addition, the flat plate member 41 is not limited to a rectangular shape long in the horizontal direction with respect to the defect portion 2, and a shape capable of suppressing the displacement physically by physically pressing the anchor bolt 3 of the defect portion 2 from the outside. If it is, it may have any shape. Further, the means for fixing the flat plate member 41 is not limited to the nut 43 screwed to the newly formed anchor 42, and any other fixing means may be used.

  The method of repairing a building foundation and the foundation structure of a building according to the present invention described above can be applied to either wooden or steel-framed construction. The foregoing embodiments are illustrative of the present invention and are not limited thereto.

  The present invention is suitably applicable to the repair of a defect in a building foundation.

DESCRIPTION OF SYMBOLS 1 Building foundation 2 Defective part 3 Anchor bolt 4 Reinforcement member 41 Flat plate member 411 Through hole 42 New anchor 43 Nut 44 Packing material 5 Embed hole 6 Chemical capsule 7 Form 8 Repair agent

Claims (6)

It is a repair method of a building foundation that repairs a defect in the building foundation using a reinforcement member,
An anchor bolt is embedded in the building foundation, and the reinforcing member has a flat plate member provided with a through hole, and a new anchor inserted into the through hole,
Drilling a hole for the new anchor in the lateral direction crossing the anchor bolt in the vicinity of the anchor bolt in a state in which the lower end portion is buried at the defect portion;
An anchor setting step of embedding one end of the new anchor in the embedding hole and installing the new anchor in the defect portion;
The flat plate member is installed by inserting the other end of the new anchor into the through hole of the flat plate member, fixing the flat plate member and the anchor bolt in a contact state, and installing the flat plate member in the defective portion. Process,
After each of the steps, a step of repairing the defective portion with the repair agent to the original shape;
Repairing method of building foundations characterized by including. In the repair method of a building foundation according to claim 1,
Before the said drilling process, the surface fragile part of the said defect part is removed, and the upper half part of the anchor bolt embed | buried in the building foundation is exposed to the said defect part, The repair method of the building foundation characterized by the above-mentioned. In the repair method of a building foundation according to claim 1 or 2,
In the flat plate member installation step, the flat plate member is disposed so as to straddle the plurality of anchor bolts with respect to a plurality of adjacent anchor bolts embedded in the foundation of the building. Construction method. In the repair method of a building foundation according to any one of claims 1 to 3,
The reinforcing member has a plurality of through holes in the flat plate member and is provided with a plurality of new anchors.
In the drilling step, the embedded holes are respectively drilled in the side portions of the anchor bolt between the anchor bolts with respect to a plurality of adjacent anchor bolts embedded in a building foundation. Repairing method for building foundations. In the repair method of a building foundation according to any one of claims 1 to 4,
In the anchor installation step, a repair method of a building foundation, wherein the new anchor is disposed in the horizontal direction. It is a foundation structure of a building using a reinforcing member,
The reinforcing member includes a flat plate member having a through hole, and a new anchor disposed through the through hole.
The lower end of the anchor bolt is buried in the building foundation,
The flat plate member is attached to the buried portion of the anchor bolt and the new anchor is driven through the through hole of the flat plate member, and the reinforcing member is buried in the building foundation,
The building is characterized in that the flat plate member is embedded so that one surface faces the anchor bolt and intersects the anchor bolt, and the new anchor is embedded so as to intersect the anchor bolt. Foundation structure.

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