JP4143016B2 - Slab reinforcement method - Google Patents

Description

  The present invention relates to a method for reinforcing a slab that reinforces a slab of an aging slab, for example, an aging slab that has not yet been rebuilt and whose function can be improved by reinforcement.

  As a technique for reinforcing a slab of a building with an external cable, conventionally, as schematically illustrated in FIG. 8, a support member and a deflector that support the slab are provided on the lower surface of the slab, and the support member and the deflector are attached to the slab. A technique of hanging and supporting with an external cable disposed below is known. Such a technique is also used as a beam reinforcement technique.

  In addition, as shown in FIG. 7, an oblique hole that penetrates the slab up and down is opened, an outer cable that supports the lower surface of the slab through the hole and goes out to the upper surface is disposed, and the slab is reinforced with the outer cable. There is a technology (for example, see Non-Patent Document 1).

In the reinforcement of the slab as shown in FIGS. 7 and 8, since the outer cable is arranged below the slab, the ceiling finish is restricted and the effective height of the ceiling is restricted. In addition, the impact on the lower floor during construction is large.
“Architecture Technology” 1988, 09 p. 189-196

  The present invention relates to a technique for reinforcing a slab using an outer cable, and unlike the conventional technique, the outer cable is avoided from being arranged below the slab, the ceiling finish on the lower surface of the slab is restricted, and the ceiling is effective. An object of the present invention is to provide a slab reinforcement technique that is not affected by a height restriction.

  The present invention is, for example, a slab of an aging slab that has not yet been rebuilt, but a slab reinforcement method that reinforces an old slab that can be improved by reinforcement with an external cable. provide.

  The present invention has been made to solve the above-mentioned problems. When reinforcing an existing slab of a building, a slab support member is provided at an intermediate portion of the slab, a deflection tool is attached to the support member, and the slab is located above the slab. A method for reinforcing a slab, characterized in that an outer cable is wired and tensioned over one span or a plurality of spans via the deflector, and both ends of the outer cable are fixed to members at end portions of the slab.

  In the present invention, a support member is provided in the middle part of the slab, and a deflecting tool is attached to the support member. The deflecting tool is a member that abuts against a portion of the outer cable that changes its axial direction.

  The positions where the support member is attached to the slab are preferably two positions appropriate for the central portion of the slab in the outer cable wiring direction or the wiring of the outer cable. The mounting interval between the support members provided at the two positions may be determined according to the structure of the slab, the deformation amount of the slab, the wiring shape, and the like.

  If the support member is composed of a steel material that penetrates the slab vertically (for example, a through bolt) and a reinforcing member such as a steel plate provided on the lower surface of the slab, the support member can be easily made a support member with high attachment strength to the slab. It is possible and suitable. Moreover, it is not necessary to provide a large protrusion or member on the lower surface of the slab, and the slab can be reinforced with an external cable with a simple structure. For example, it is good to attach the steel plate which supports a slab with a nut to the lower end of several through bolts which penetrate a slab up and down.

  In addition, both ends of the outer cable may be fixed to the structure at the end of the slab, but if the fixing is performed on a fixing device that penetrates the structure and is disposed on the back of the structure, the most appropriate fixing member is used. It can be designed and is preferable. A continuous cable extending over a plurality of spans may be used.

  If the external cable is an external cable that can handle the load that takes into account the additional load generated by the floor finish (such as mortar), and placed in the floor finish, the external cable can be placed in the floor finish. In addition to being able to avoid getting in the way, it is also preferable in terms of fire resistance.

  The method of reinforcing the slab with the outer cable of the present invention is arranged as described above, the outer cable is arranged on the upper surface of the slab, and the outer cable is wired so as to lift the slab, so there is no member projecting on the lower surface side of the slab, There is no restriction on the effective height of the ceiling, and it is easy to embed the outer cable in the floor finish. Therefore, in terms of construction, it has a great effect that it contributes to an excellent effect, such as construction is possible with residents living downstairs.

  Embodiments of the present invention will be described below with reference to the drawings.

  In contrast to the prior art of FIGS. 7 and 8, FIG. 6 shows a schematic diagram of an embodiment of the present invention. In FIG. 7, an oblique hole 102 is drilled in the slab 100, the lower surface of the slab 100 is supported by the outer cable 20 through the hole 102, and the outer cable 20 is stretched so as to suspend the slab as indicated by an arrow 40. Set up. In FIG. 8, a support member 50 protruding from the lower surface of the slab 100 is provided, and a deflection tool is attached to the support member 50 to support the slab 100 as indicated by an arrow 51, and the slab is suspended by the outer cable 20.

  In contrast, in the present invention, as shown in FIG. 6, the support member 10 is provided on the upper surface of the slab 100, and a deflection tool is attached to the support member 10, and the slab is suspended by the outer cable 20 as indicated by an arrow 21.

  FIG. 1 is a side view showing a method for reinforcing a slab with an external cable according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. A support member 10 for pulling up the slab is provided on the upper surface of the intermediate portion of the slab 100 to be reinforced, a deflecting tool is attached to the support member 10, the outer cable 20 is wired and tensioned above the slab 100, and both end portions of the outer cable 20 are connected. Fixing is performed on the fixing unit 30. In this example, the fixing unit 30 is provided on the back surface of the structure 110 at both ends of the slab. The support member 10 is provided at one central portion of the slab 100 or two intermediate portions of the slab depending on the situation of the slab 100 to be reinforced. The number of outer cables may be determined according to the actual situation of the slab to be reinforced.

  A partially enlarged view of FIG. 1 is shown in FIG. The support member 10 has a steel plate 12 supporting the slab vertically attached to the lower end of the steel material 11 penetrating up and down the slab 100 with a nut 13, a receiving plate 14 attached to the upper end of the steel material 11, and a deflector 16 attached to the lower surface thereof. The end portion of the outer cable 20 is fixed by providing a fixing portion 30 on the back surface of the structure 110. A floor finish 101 made of mortar or the like is applied on the upper surface of the slab 100.

  An example of the support member 10 is shown in FIG. 4A is a side view, FIG. 4B is a front view, and FIG. 4C is a bottom view of the deflector 16. A steel plate 12 that supports the lower surface of the slab is attached to the lower ends of the four high-strength steel materials 11 by nuts 13. The high-tensile steel material 11 is vertically positioned by the steel plate 17 positioned on the upper surface of the slab 100. A receiving plate 14 having a deflector 16 attached to the lower surface is fixed to the upper end of the high-tensile steel material 11 with a nut 15. Reference numeral 19 denotes a hole through which the steel material 11 passes. The deflector 16 is provided with a groove 18 for receiving the outer cable. The support member 10 is not limited to this embodiment, but this structure is simple and has no large protrusion on the lower surface of the slab, and has a large force for supporting the slab.

  FIG. 5 shows a horizontal sectional view of an embodiment of the fixing unit 30 as an example. A screw sleeve 22 is attached to the end of the outer cable 20, and the screw sleeve 22 is fixed to the fixing unit 30. The fixing unit 30 includes a reinforcing concrete 31 formed on the back surface of the structure 110, a fixing body 32 disposed on the back surface, a nut 34 screwed onto a screw provided on the outer periphery of the sleeve 22, and the nut 34 fixed to the fixing body 32. The end of the outer cable 20 is fixed by crimping to the back surface of the cable. After fixing, the protective cap 35 is covered for protection.

  In order to improve the performance of the existing slab 100 having a short side of about 3600 mm × long side of about 7200 mm × thickness of 110 mm, a support member 10 is provided on the upper surface as shown in FIG. And reinforced. A mortar having a thickness of about 40 mm was added to the upper surface of the slab 100 as a floor finish to make the upper surface of the slab horizontal and to improve the sound insulation performance by increasing the mass of the slab 100.

  As in the prior art, a deflecting tool is not provided on the lower surface of the slab, and the outer cable 20 is not exposed on the lower surface of the slab. it can.

It is a side view of an Example. It is a top view of an Example. It is a partial expanded side view of an Example. It is a side view of a supporting member. It is a front view of a supporting member. It is an AA arrow line view of Fig.4 (a). It is sectional drawing of a fixing part. It is a bottom view of a deflecting tool. It is a schematic diagram of a prior art example. It is a schematic diagram of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support member 11 Steel material 12 Steel plate 13 Nut 14 Receiving plate 15 Nut 16 Deflector 17 Steel plate 18 Groove 19 Hole 20 Outer cable 21 Arrow 22 Screw sleeve 30 Fixing part 31 Reinforcement concrete 32 Fixing body 34 Nut 35 Protection cap 40 Arrow 50 Deflection tool 51 arrow 100 slab 101 floor finish 102 slant hole 110 structure

Claims (4)

  When reinforcing an existing slab of a building, a slab support member is provided in the middle part of the slab, a deflection tool is attached to the support member, and an outer cable is connected to the span over one span or a plurality of spans via the deflection tool. A method for reinforcing a slab, characterized by wiring and tensioning, and fixing both ends of the outer cable to a member at an end of the slab.   The method of reinforcing a slab according to claim 1, wherein the support member includes a steel material that vertically penetrates the slab and a reinforcing member provided on a lower surface of the slab.   The slab reinforcement method according to claim 1 or 2, wherein both ends of the outer cable are fixed to a fixing device that penetrates the structure and is fixed to the back surface of the structure.   The method for reinforcing a slab according to any one of claims 1 to 3, wherein the outer cable is housed in a floor finish.

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