JP2014055471A - Aseismatic reinforcement structure for mortar external wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aseismatic reinforcement structure for a mortar external wall, capable of being easily and inexpensively constructed while minimizing occurrence of demolition/removal work and capable of being constructed even when a resident dwells in a residential building with the mortar external wall.SOLUTION: An aseismatic reinforcement structure 10 for a mortar external wall improves earthquake resistance of an existing mortar external wall 11 provided in a residential building. A plurality of fixing nails 15 are driven into exterior wall structure materials 14 such as columns, beams, and a foundation via lower holes 13 formed in a solidification mortar layer 12 configuring the existing mortar external wall 11, and the solidification mortar layer 12 is fastened to the exterior wall materials 14 by fixing heads 15a of the fixing nails 15 to the surface of the solidification mortar layer 12 while a washer member 16 and a primer layer 17 are interposed therebetween, thereby, making the solidification mortar layer 12 function as a strength element and improving the earthquake resistance.

Description

  The present invention relates to a seismic reinforcement structure for a mortar outer wall, and more particularly to a seismic reinforcement structure for a mortar outer wall that improves the seismic resistance of an existing mortar outer wall provided in a building.

  The outer wall of the mortar is supported by an outer wall structural material such as a pillar, a beam, or a base, and after attaching the woodwork base, the mortar is covered with asphalt felt as appropriate and the mortar has a predetermined thickness. It is formed by applying mortar and solidifying it with the body edge material and the lath sheet attached, supporting it on the outer wall structural material such as pillars, beams, foundations, etc. is there. These mortar outer walls are widely used, for example, as the specifications of the outer walls of residential buildings constructed in 1965 to 1950, and exist as mortar outer walls of many residential buildings.

  On the other hand, in recent years, lessons learned from the Great Hanshin Earthquake and the Great East Japan Earthquake, and the occurrence of large-scale earthquakes are expected in the future, so as an existing old building that is not particularly earthquake resistant, for example, a house with a mortar outer wall. Seismic reinforcement work is also performed on existing buildings such as buildings (see, for example, Patent Document 1 and Patent Document 2).

JP 9-317006 A JP 2008-231701 A

  In general, when performing seismic retrofitting work on the outer wall of a building, the wall finishing material or wall base material on the indoor side or outdoor side is removed from the outer wall, and all or part of the outer wall structural material such as pillars, beams, foundations, etc. After exposing the wall, it is supported by the exposed outer wall structural material, constructs the struts, structural plywood, etc., and restores the wall base material and wall finishing material. Recovery work will occur. In addition, seismic reinforcement work that involves dismantling / removal work and restoration work requires curing the dismantled part of the outer wall, moving furniture, and temporary housing, which increases the labor and cost of the work.

  The present invention is a mortar outer wall that can be easily and inexpensively constructed without generating disassembly / removal work as much as possible, and can be easily constructed by work from the outside of the building even if the resident is living. The purpose is to provide a seismic reinforcement structure.

  The present invention is a seismic reinforcement structure for a mortar outer wall that improves the seismic resistance of an existing mortar outer wall provided in a building, and a pillar is formed through a pilot hole formed in a solidified mortar layer constituting the existing mortar outer wall. A plurality of fixing nails or fixing screws are struck toward the outer wall structural material such as beams, foundations, vertical frames, lower frames, upper frames, etc., and the heads of these fixing nails or fixing screws are placed on the surface of the solidified mortar layer. By fixing the solidified mortar layer to the outer wall structure material by fixing the solidified mortar layer to the outer wall structural material, the above object is achieved by providing a seismic reinforcement structure for the outer wall of the mortar that functions as the load-bearing element. is there.

  And in the earthquake-proof reinforcement structure of the mortar outer wall of this invention, it is preferable that the said existing mortar outer wall is equipped with the wall strength magnification of 1.6 kN / m or more.

  Further, in the seismic reinforcement structure for an outer wall of the mortar according to the present invention, the surface of the solidified mortar layer has the fixed nail or the fixed screw in a state where a washer member is interposed between the head and the solidified mortar layer. It is preferable to fix it to the surface.

  Furthermore, in the seismic reinforcement structure for an outer wall of the mortar according to the present invention, the head of the fixed nail or the fixed screw is placed on the solidified mortar layer with a primer layer interposed between the washer member and the solidified mortar layer. It is preferably fixed on the surface.

  Furthermore, in the seismic reinforcement structure for an outer wall of the mortar according to the present invention, it is preferable that the primer layer is interposed between the washer member and the solidified mortar layer in a state where a primer is impregnated into a fiber sheet.

  Further, in the seismic reinforcement structure of the outer wall of the mortar according to the present invention, the surface of the solidified mortar layer to which the head of the fixed nail or the fixed screw is fixed is covered and an alkali-resistant reinforcement net is buried in the coated mortar. It is preferable that the layers are laminated.

  Furthermore, according to the seismic reinforcement structure of the outer wall of the mortar of the present invention, it is preferable that the outer wall finish is applied so as to cover the surface of the protective layer by the coating mortar with the reinforcing net covered.

  According to the seismic reinforcement structure of the outer wall of the mortar of the present invention, it can be constructed easily and inexpensively without causing dismantling / removal work as much as possible, and it can be easily performed from the outside of the building even if the resident is resident. Can be constructed.

(A) is a schematic sectional drawing explaining the structure of the earthquake-proof reinforcement structure of the mortar outer wall based on preferable one Embodiment of this invention, (b) is the A section enlarged view of (a). FIG. 3 is a schematic front view illustrating a band-shaped region along a fixing surface on a nail driving line on which a primer layer is formed. An example of the test method of the bearing wall of the wooden frame for calculating the wall magnification and the wall strength magnification will be described, (a) is a front view, and (b) is a side view.

  1 (a) and 1 (b), a seismic reinforcing structure 10 for a mortar outer wall of a building according to a preferred embodiment of the present invention is an existing old building having insufficient seismic performance, for example, in the Showa 40th-50's. The existing mortar outer wall 11 provided in the constructed residential building is adopted as a structure for effectively and effectively quake-proofing the wall. That is, the seismic reinforcement structure 10 of the mortar outer wall of the present embodiment is provided in an existing old residential building, for example, an existing mortar outer wall 11 by a woodwork base mortar coating wall or a lath sheet trunk base mortar coating wall, For example, since it has only a wall strength magnification of about 1.6 to 2.4 kN / m, the earthquake resistance is not sufficient, while the solidified mortar layer 12 constituting these existing mortar outer walls 11 itself is considerable. Therefore, it is considered that the solidified mortar layer 12 is used as it is, for example, 5.2 kN, which is equivalent to a wall to which a structural plywood is added. The existing mortar outer wall 11 should not be demolished or removed as much as possible so that it has a wall strength magnification of about / m or more (wall magnification of about 2.5 or more). Reluctant, it is to enable and inexpensively Retrofit easily.

  In addition, it is preferable to apply the seismic reinforcement structure 10 of the mortar outer wall of this embodiment to the existing mortar outer wall 11 having a wall strength magnification of 1.6 kN / m or more, and 1.6 to 2.4 kN / m. More preferably, it is applied to an existing mortar outer wall 11 having a wall strength magnification of. If the existing mortar outer wall 11 has a wall strength magnification of 1.6 kN / m or more, the seismic reinforcing structure 10 for the mortar outer wall of the present embodiment makes it possible to easily obtain sufficient earthquake resistance.

  And the earthquake-resistant reinforcement structure 10 of the mortar outer wall of this embodiment is a reinforcement structure which improves the earthquake resistance of the existing mortar outer wall 11 provided in the residential building which is the existing old building constructed, for example by the frame construction method. As shown in FIGS. 1 (a) and 1 (b), outer wall structural members 14 such as columns, beams, and foundations are provided through prepared holes 13 formed in the solidified mortar layer 12 constituting the existing mortar outer wall 11. A plurality of fixing nails or fixing screws (in this embodiment, fixing nails) 15 are struck and the heads 15a of these fixing nails 15 are fixed to the surface of the solidifying mortar layer 12, thereby solidifying the mortar layer. By fastening 12 to the outer wall structural member 14, the solidified mortar layer 12 functions as a load-bearing element.

  Further, in the seismic reinforcement structure 10 for the outer wall of the mortar according to the present embodiment, the fixed nail 15 has the head 15a of the solidified mortar layer 12 with the washer member 16 interposed between the head 15a and the solidified mortar layer 12. The head 15a of the fixing nail 15 is fixed to the surface of the solidified mortar layer 12 with the primer layer 17 interposed between the washer member 16 and the solidified mortar layer 12. .

  Further, in the seismic reinforcement structure 10 for the outer wall of the mortar according to the present embodiment, the surface of the solidified mortar layer 12 to which the head 15a of the fixed nail 15 is fixed is covered, and the alkali-proof reinforcement net 19 is laid down on the coating mortar 18. A protective layer 20 is laminated, and an outer wall finish 21 is applied to cover the surface of the protective layer 20 by the coating mortar 18 with the reinforcing net 19 covered.

  In this embodiment, the existing mortar outer wall 11 is, for example, a woodwork base mortar coating wall, and is formed by a known construction method. That is, the existing mortar outer wall 11 is supported by an outer wall structural member 14 such as a pillar, a beam, or a foundation, or an inter-structure pillar 23 that is a non-structural member, and a tree having a thickness of, for example, about 12 mm A plurality of shears are attached to form the woodwork base 22, and the surface of the woodwork base 22 is appropriately covered with a windproof sheet, asphalt felt, etc., and solidified by applying mortar with a thickness of about 15 mm, for example. Thus, the solidified mortar layer 12 is formed.

  The existing mortar outer wall 11 made of the above-mentioned woodwork base mortar coated wall has a wall strength magnification measured and calculated by a test method to be described later, for example, about 1.6 kN / m. For example, a structural plywood is added. Compared to the outer wall that has been seismically reinforced, the seismic reinforcement structure 10 of the present embodiment does not provide sufficient seismic resistance. However, as will be described later, for example, about 5.2 kN / m. As the above wall strength magnification, a wall strength magnification of about 7.1 kN / m and a wall magnification of about 3.4 are provided as a wall magnification of, for example, about 2.5 or more.

  In order to form the mortar outer wall seismic reinforcement structure 10 of the present embodiment, first, on the nailing line along the outer wall structural member 14 such as a column, a beam, or a base disposed on the back side of the existing mortar outer wall 11. The surface of the solidified mortar layer 12 is preferably scraped off to form a flat fixing surface for fixing the head 15a of the fixed nail 15 in a stable state. Further, a plurality of pilot holes 13 penetrating the solidified mortar layer 12 are formed on the fixing surface on the nail line on the surface of the solidified mortar layer 12 with a predetermined pitch of about 200 to 450 mm, for example, using a drill drill or the like. .

  Thereafter, in this embodiment, the primer layer 17 is formed by preferably applying a primer treatment to the fixing surface of the surface of the solidified mortar layer 12 on the nailing line. Here, as a primer used for primer treatment, epoxy resin, acrylic resin, urethane resin, silicone resin, melamine resin, alkyd resin, vinyl chloride resin, vinyl acetate resin, polyester resin, styrene resin, fluorine resin, etc. should be used. In particular, an epoxy resin can be preferably used. The primer layer 17 is formed by applying a non-woven fabric, for example, as a fiber sheet along the fixing surface of the surface of the solidified mortar layer 12 on the nailing line as shown in FIG. It is preferable to form a belt-like shape along the fixing surface on the nail driving line by impregnating. By forming the primer layer 17 in a state where the fiber sheet is impregnated with the primer, the strong primer layer 17 can be stably formed on the nail driving line.

Here, a woven fabric or a non-woven fabric can be used as the fiber sheet impregnated with the primer. Examples of the fibers constituting the fiber sheet include resin fibers (rayon, polyester fibers, polypropylene fibers, polyethylene fibers, vinylon fibers, aramid fibers, acrylic fibers, nylon fibers, etc.), carbon fibers, glass fibers, and the like. Basis weight of the fiber sheet, for example 50~160g / m ^2, preferably 70~140g / m ^2, more preferably be a 90~120g / m ^2, fiber sheet thickness, for example 0.4 The thickness can be 1.0 mm, preferably 0.5 to 0.9 mm, and more preferably 0.6 to 0.8 mm.

  When the primer layer 17 is formed along the fixing surface on the nail line on the surface of the solidified mortar layer 12, it is preferably inside the head 15a through the prepared hole 13 formed through the solidified mortar layer 12. After mounting the washer member 16, a plurality of fixing nails such as CN75 and CN90, for example, are struck toward the outer wall structural member 14 such as a column, a beam, or a base, so that the heads 15a of these fixing nails 15 are Preferably, the primer layer 17 and the washer member 16 are interposed and fixed on the fixing surface on the nailing line on the surface of the solidified mortar layer 12.

  Here, as the washer member 16, various known washer members made of metal or synthetic resin and used when driving a fixing nail or a fixing screw can be used. By fixing the head 15a of the fixing nail 15 to the surface of the solidified mortar layer 12 with the washer member 16 interposed between the solidified mortar layer 12 and the outer wall structural member 14 such as a column, a beam, or a base. When the fixed nail 15 is struck toward the head, the head 15a of the fixed nail 15 is effectively prevented from sinking into the surface of the solidified mortar layer 12 and being fixed with the fixing surface damaged. It becomes possible to do.

  The washer member 16 is preferably made of metal. As the size of the metal washer member 16, the thickness can be set to, for example, 0.3 to 1.5 mm, preferably 0.35 to 1.0 mm, and more preferably 0.4 to 0.8 mm. For example, 8 to 40 mm, preferably 10 to 35 mm, and more preferably 15 to 30 mm.

  Further, by fixing the head portion 15a of the fixed nail 15 to the surface of the solidified mortar layer 12 with the primer layer 17 interposed between the washer member 16 and the solidified mortar layer 12, the head portion of the fixed nail 15 is fixed. It is possible to more effectively avoid 15a from sinking into the surface of the solidified mortar layer 12 and damaging the fixing surface, and further improving the strength of the mortar outer wall 11 more effectively. It becomes possible.

  In the present embodiment, the fixing nail 15 penetrates the solidified mortar layer 12 and is driven only toward the outer wall structural member 14 such as a column, a beam, or a base, and the fastening is uncertain. Therefore, the fixed nail 15 is not driven into the inter-column 23 or the like, which is a non-structural material. However, the existing mortar outer wall 11 is sufficiently formed by hitting the fixed nail 15 only toward the outer wall structural material 14. Seismic reinforcement is possible. Further, the fixed nail 15 can be driven into a non-structural material such as the inter-column 23 to obtain the seismic reinforcement structure of this embodiment.

  In the present embodiment, a protective layer 20 in which a reinforcing net 19 is covered is preferably laminated on the coating mortar 18 so as to cover the surface of the solidified mortar layer 12 to which the head 15a of the fixed nail 15 is fixed. Further, an outer wall finish 21 is applied to cover the surface of the protective layer 20.

  Here, the reinforcing net 19 constituting the protective layer 20 is preferably a known mortar reinforcing net member having alkali resistance, such as a biaxial net or a triaxial net. As the constituent material of the net member, resin fibers (polypropylene fiber, polyethylene fiber, vinylon fiber, aramid fiber, acrylic fiber, nylon fiber, etc.), carbon fiber, glass fiber, and the like can be used. The mesh of the net | network by these fibers can be 5-30 mm, for example, Preferably it is 7-20 mm, More preferably, it can be 8-15 mm. More specifically, as such a net member, a trade name “KS Net V” (triaxial vinylon fiber net: manufactured by Kikusui Chemical Co., Ltd.) can be preferably used. As the coating mortar 18, various known mortars such as PC mortar can be used.

  The protective layer 20 can be easily formed by applying the coating mortar 18 after the reinforcement net 19 is depressed on the surface of the solidified mortar layer 12 to which the head 15a of the fixed nail 15 is fixed. Since the reinforcing net 19 is depressed, it is possible to effectively prevent the protective layer 20 from being cracked.

  Further, the outer wall finish 21 covering the surface of the protective layer 20 can be easily formed by, for example, a painted wall or a spray tile.

  And according to the earthquake-proof reinforcement structure 10 of the mortar outer wall of the present embodiment having the above-described configuration, it can be constructed easily and inexpensively so as not to generate dismantling / removal work as much as possible, and even if the resident remains inhabited. It can be easily constructed by work from the outdoor side of an existing old residential building.

  That is, according to the present embodiment, a plurality of fixed nails 15 are directed toward the outer wall structural member 14 such as a column, a beam, and a base through the prepared holes 13 formed in the solidified mortar layer 12 of the existing mortar outer wall 11. And fixing the heads 15a of these fixed nails 15 to the surface of the solidified mortar layer 12, the solidified mortar layer 12 is fastened to the outer wall structural member 14, whereby the solidified mortar layer 12 is used as a strength element as it is. Since the existing mortar outer wall 11 is seismically strengthened by functioning, the prepared mortar layer 12 and the woodwork base 22 are not dismantled and removed, and the prepared holes 13 are formed as they are, and the fixed nail 15 is attached to the outer wall. It is possible to easily improve the earthquake resistance of the mortar outer wall 11 so that the wall magnification becomes 2.5 or more, for example, by a simple and inexpensive operation simply by striking the structural material 14. In addition, the work from the indoor side of the mortar outer wall 11 is not required, and it is possible to easily perform the work while the resident is resident. It can also be performed efficiently.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the fixing member that is struck toward the outer wall structural member through the pilot hole and the head is fixed to the surface of the solidified mortar layer does not necessarily need to be a fixing nail, and may be a fixing screw. Moreover, the building provided with the existing mortar outer wall does not necessarily need to be a housing building by a frame construction method, and may be a housing building by a frame construction method. In the case of a building by the frame wall construction method, a fixed nail or a fixing screw can be driven using a vertical frame, a lower frame, an upper frame, etc. as an outer wall structural material. Furthermore, it is not always necessary to fix these heads to the surface of the solidified mortar layer with a washer member or primer layer interposed between them, and the heads of the fixing nails and screws are fixed. It is not always necessary to laminate a protective layer that covers the surface of the solidified mortar layer that is covered with the reinforcing net.

  Even when the primer layer is provided, the primer layer is not necessarily formed in a strip shape along the fixing surface of the nail driving line, and can be provided only around each pilot hole. The fiber sheet does not necessarily have to be attached in a band shape along the fixing surface of the nail driving line, and can be attached only around each pilot hole. The primer layer is preferably formed larger than the head of a nail or screw (when a washer member is used, the washer member). When a fiber sheet is included in the primer layer, it is preferable to use a fiber sheet that is larger than the head of a nail or a screw (when a washer member is used).

  Hereinafter, although the earthquake-proof reinforcement structure of the mortar outer wall of this invention is demonstrated in detail by an Example and a comparative example, this invention is not limited to these.

  As shown in FIGS. 3A and 3B and Table 1, the 2P type shaft is assembled so that the vertical measurement distance H is about 2730 mm and the horizontal measurement distance B is about 1820 mm. The unreinforced mortar outer wall obtained by forming a solidified mortar layer with a wood mortar base mortar coating wall on the surface side of the outer wall structural material of the assembled bearing wall was used as a test body of Comparative Example 1. For the unreinforced mortar outer wall of Comparative Example 1, a fiber sheet (nonwoven fabric made of polyester fiber) impregnated with a fixing nail, a washer, and a primer (two-component reaction curable epoxy resin), The mortar outer wall reinforced by earthquake resistance using a protective layer with a reinforced net (a triaxial net made of vinylon fiber) covered was used as test specimens of Examples 1 to 4. In the test body of Example 1, CN75 was used as the fixed nail, and the fixed nail was struck toward the outer wall structure material at a pitch of 227.5 mm along the nail driving line. In the test body of Example 2, CN75 was used as a fixed nail, and the fixed nail was struck toward the outer wall structure material at a pitch of 300 mm along the nail driving line. In the test body of Example 3, a CN75 fixing nail was struck toward the outer wall structure material at a pitch of 227.5 mm along the nailing line without using the fiber sheet impregnated with the primer. In the test body of Example 4, CN90 was used as the fixed nail, and the fixed nail was struck toward the outer wall structure material at a pitch of 227.5 mm along the nail driving line.

  Using the test apparatus shown in FIGS. 3A and 3B for the test body of Comparative Example 1 and the test bodies of Examples 1 to 4, the Building Standard Law Enforcement Ordinance Article 46, Paragraph 4 Table 1 As a test method for the bearing wall of a wooden frame based on (8) of No. 8, the test method specified by the designated performance evaluation organization (established by the Building Materials Testing Center on June 1, 2000, “Wooden bearing wall and its magnification The wall magnification and the wall strength magnification determined by the Building Disaster Prevention Association were calculated by the method according to the “Test and Evaluation Work Method”. Table 2 shows the calculation results. In addition, the calculation result shown in Table 2 is an average value of the calculation result obtained using two test bodies for each of Comparative Example 1 and Examples 1 to 4.

  According to the calculation results shown in Table 2, the unreinforced specimen of Comparative Example 1 was not reinforced with sufficient earthquake resistance, but was reinforced with earthquake resistance by the earthquake resistant reinforcement structure of the mortar outer wall of the present invention. In the specimens of Examples 1 to 4, the wall magnification and the wall strength magnification were effectively improved. For example, the wall magnification was larger than a wall having a wall magnification of about 2.5 to which a structural plywood was added. It turns out that it has sufficient earthquake resistance.

10 Seismic reinforcement structure of mortar outer wall 11 Mortar outer wall 12 Solidified mortar layer 13 Pilot hole 14 External wall structural material (column)
15 Fixed nail 15a Head 16 Washer member 17 Primer layer 18 Coating mortar 19 Reinforcement net 20 Protective layer 21 Outer wall finish 22 Woodwork base 23 Non-structural material (intermediate column)

Claims (7)

An anti-seismic reinforcement structure for the mortar outer wall that improves the earthquake resistance of the existing mortar outer wall provided in the building,
A plurality of fixing nails or fixing screws are directed toward an outer wall structural material such as a column, a beam, a base, a vertical frame, a lower frame, and an upper frame through a prepared hole formed in the solidified mortar layer constituting the existing mortar outer wall. And fixing the heads of these fixing nails or fixing screws to the surface of the solidified mortar layer, thereby fastening the solidified mortar layer to the outer wall structural member, whereby the solidified mortar layer is used as a strength element. Seismic reinforcement structure for mortar outer wall to function.   The seismic reinforcement structure for a mortar outer wall according to claim 1, wherein the existing mortar outer wall has a wall strength magnification of 1.6 kN / m or more.   3. The mortar according to claim 1, wherein the fixing nail or the fixing screw fixes these heads to the surface of the solidified mortar layer with a washer member interposed between the head and the solidified mortar layer. Seismic reinforcement structure for outer walls.   The mortar outer wall according to claim 3, wherein a head of the fixing nail or fixing screw is fixed on a surface of the solidified mortar layer with a primer layer interposed between the washer member and the solidified mortar layer. Seismic reinforcement structure.   The seismic reinforcement structure for an outer wall of a mortar according to claim 4, wherein the primer layer is interposed between the washer member and the solidified mortar layer in a state where a primer is impregnated into a fiber sheet.   The protective layer which covered the surface of the said solidified mortar layer to which the head of the said fixed nail or fixed screw was fixed, and laid the alkali-proof reinforcement net on the coating mortar is laminated | stacked. 2. A seismic reinforcement structure for mortar outer wall according to claim 1.   The seismic reinforcement structure for an outer wall of a mortar according to claim 6, wherein an outer wall finish is applied so as to cover a surface of a protective layer formed by the coated mortar with the reinforcement net being concealed.

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