JP2012046992A - Structure and method for reinforcing floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more firmly reinforce a floor slab.SOLUTION: A shear force is transferred between a thickness-increased portion 210 and a floor slab 12 by a first protrusion 220 which is formed by making concrete S infilled into a through-hole 120 and solidified. In other words, the first protrusion 220 formed in the through-hole 120 performs a function of shear transfer corresponding to a cross-sectional area of the through-hole 120. Thus, the thickness-increased portion 210 (reinforced portion 200) and the floor slab 12 are more firmly integrated together. Consequently, the floor slab 12 is more firmly reinforced than a constitution in which the reinforced portion 200 does not have the first protrusion 220.

Description

  The present invention relates to a floor slab reinforcement structure and a floor slab reinforcement method.

  As a method for reinforcing an existing floor slab made of reinforced concrete, an upper surface reinforcing method for reinforcing the floor surface from the upper surface and a lower surface reinforcing method for reinforcing the floor surface from the lower surface are known.

  For example, as an upper surface reinforcement method that reinforces the floor surface from the upper surface, the existing floor that is repaired by removing the surface layer of the existing floor that is formed of a solidified material and forming a new surface layer in the removed portion (See, for example, Patent Document 1).

  Also, for example, as a bottom surface reinforcement method to reinforce the floor surface from the bottom surface, remove the concrete of the part that requires reinforcement of the existing concrete floor slab, remove at least both ends of the reinforcing part to the back side of the reinforcing bar, and expose the reinforcing bar, A reinforcement method for lower surface of a reinforced concrete floor slab is proposed in which a reinforcing reinforcing bar is connected to an exposed reinforcing bar with a connecting metal fitting, and a short fiber reinforced mortar or concrete is sprayed on the reinforcing part to increase the thickness (for example, Patent Document 2). reference).

JP 2002-250137 A JP 2002-167777 A

  Here, a reinforcing structure for reinforcing the floor slab more firmly, or a reinforcing method with good workability is desired.

  In view of the above, it is an object of the present invention to provide a floor slab reinforcement structure that reinforces a floor slab more strongly, or a method of reinforcing a floor slab with good workability.

  The invention of claim 1 includes a floor slab constituting a structure, a through-hole penetrating the floor slab, a thickened portion formed on a lower surface of the floor slab, and an inner portion of the through-hole from the thickened portion. And a reinforcing portion having a protruding portion.

  Therefore, a shearing force is transmitted between the thickened portion and the floor slab by the protruding portion that enters the through hole from the thickened portion formed on the lower surface of the floor slab. Therefore, the floor slab is more strongly reinforced than the configuration in which the reinforcing portion that reinforces the floor slab does not have the protruding portion.

  According to a second aspect of the present invention, a groove portion is formed along the beam or wall at or near the junction with the beam or wall constituting the structure on the upper surface of the floor slab.

  Therefore, since the fixing degree of the edge part of a floor slab falls by a groove part, the burden of the junction part in a floor slab reduces.

  According to a third aspect of the present invention, there is provided a through-hole forming step of forming a through-hole in a floor slab constituting a structure, a mold-installation step of arranging a mold under the floor slab, and the penetration of the floor slab The thickened portion and the thickened portion formed on the lower surface of the floor slab by filling the solid material into the space between the lower surface of the floor slab and the formwork and the through-holes from the holes and solidifying them. And a reinforcing portion forming step of forming a reinforcing portion having a protruding portion that enters the through hole.

  Therefore, since the reinforcing part is formed on the lower surface of the floor slab by filling the filler from the upper surface side of the floor slab through the through-hole, the workability is better compared to the construction performed from the lower surface side of the floor slab. Further, the shearing force is transmitted between the thickened portion and the floor slab by the protruding portion formed by filling the through hole and solidifying.

  According to the present invention, the floor slab can be reinforced more strongly or the workability can be improved as compared with the configuration in which the through hole is not formed in the floor slab.

It is the top view seen from the upper side which shows the floor slab with which the reinforcement structure of the floor slab which concerns on embodiment of this invention was applied. It is sectional drawing which shows the cross section along the 2-2 line of FIG. It is sectional drawing which shows the cross section along the 3-3 line of FIG. It is process drawing which shows the process of reinforcing a floor slab in order to (A)-(C). It is sectional drawing corresponding to FIG. 2 which shows the 1st variation of the floor slab to which the reinforcement structure of the floor slab which concerns on embodiment of this invention was applied. It is sectional drawing corresponding to FIG. 3 which shows the 2nd variation of the floor slab to which the reinforcement structure of the floor slab which concerns on embodiment of this invention was applied.

<Reinforcement structure of floor slab>
A reinforcing structure of a floor slab according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1-3, the reinforced concrete structure 10 in this embodiment is comprised by the floor slab 12, walls 14, 16 grade | etc.,. As shown in FIGS. 2 and 3, the floor slab reinforcement structure of the embodiment of the present invention is applied to a reinforced concrete floor slab 12 that is a structural floor between the upper floor and the lower floor of the structure 10. It is reinforced.

  A formwork 110 is provided below the lower surface 12A of the floor slab 12. In this embodiment, the formwork 110 is comprised with the corrugated steel plate. The vertical direction is the Z direction, the corrugated direction of the corrugated steel sheet is the X direction, and the direction orthogonal to the X direction and the Z direction is the Y direction. The Y direction coincides with the ridge line direction of the waveform. Moreover, the one-dot broken line T of FIG. 1 represents the ridgeline of the peak part of a waveform, as shown in FIG.

  A through hole 120 penetrating in the vertical direction is formed in the floor slab 12 corresponding to the concave portion 112 on the upper side of the mold 110 made of a corrugated steel plate.

  As shown in FIG. 1, in the present embodiment, a plurality of through holes 120 are formed for each recess 112, and a plurality of through holes 120 are formed at regular intervals in the Y direction.

  Further, a horizontal hole 122 penetrating in the horizontal direction is formed in the vicinity of the joint portion of the wall 16 with the floor slab 12.

  As shown in FIGS. 2 and 3, a recess 112 (a space between the mold 110 and the lower surface 12 </ b> A of the floor slab 12) of the mold 110 made of corrugated steel is formed on the floor slab 12. The reinforcing portion 200 is formed by filling and solidifying the concrete S in the through hole 120 and the lateral hole 122 formed in the wall 16.

  Therefore, the reinforcing part 200 enters the through hole 120 from the thickened part 210 formed on the lower surface 12A of the floor slab 12 (the concave part 112 of the mold 110) and the thickened part 210 (extends to the through hole 120). It has the 1st protrusion part 220 and the 2nd protrusion part 222 (refer FIG. 3) which penetrates into the horizontal hole 122 from the thickening part 210 (extends to the horizontal hole 122).

  In the present embodiment, the upper surface 220B of the first protrusion 220 and the upper surface 12B of the floor slab 12 are substantially flush with each other.

  The upper surface 220B of the first protrusion 220 may be lower than the upper surface 12B of the floor slab 12, that is, the through hole 120 may be concave. Or the structure which the upper surface 220B of the 1st protrusion part 220 protruded from the upper surface 12B of the floor slab 12 may be sufficient.

  In the present embodiment, as shown in FIGS. 1 and 3, a plurality of reinforcing bars 230 are arranged along the Y direction in the thickened portion 210 of the reinforcing portion 200. The end portion 230 </ b> A of the reinforcing bar 230 is arranged in a second projecting portion 222 that extends into the lateral hole 122 formed in the wall 16.

  As shown in FIGS. 1 and 2, a groove portion 50 is formed along the wall 16 (along the X direction) in the vicinity of the joint portion (end portion) of the wall 16 on the upper surface 12 </ b> B of the floor slab 12. Is formed.

<Reinforcement method of floor slab>
Next, a reinforcing method (construction method) of a floor slab according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 4 (A) and FIG. 4 (B), the through hole 120 is formed in the floor slab 12 constituting the structure 10 (core removal is performed). Further, a lateral hole 122 is formed in the wall 16 (see FIGS. 1 and 3). Further, a groove 50 is formed along the wall 16 (along the X direction) in the vicinity of the joint portion with the wall 16 on the upper surface 12B of the floor slab 12 (see FIGS. 1 and 3).

  Next, as shown in FIG. 4C, the formwork 110 in which the reinforcing bars 230 are assembled is installed on the lower side of the floor slab 12.

  In addition, the formation position of the through-hole 120 and the installation position of the mold 110 are adjusted in advance so that the concave portion 112 of the mold 110 made of corrugated steel and the through-hole 120 coincide with each other.

  The mold 110 is temporarily fixed by a support work or the like. Any method may be used for temporarily fixing the mold 110. For example, the wall 14 or the wall 16 may be temporarily fixed with a jig or the like.

  As shown in FIG. 4 (D), concrete S is cast from the through hole 120 from the upper surface 12B side of the floor slab 12, and a space between the lower surface 12A of the floor slab 12 and the mold frame 110 (of the mold frame 110). The concrete S is filled into the recess 112), the through hole 120, and the lateral hole 122 (see FIGS. 1 and 3).

  When the filled concrete S is solidified, the reinforcing portion 200 having the thickened portion 210 to which the reinforcing bars 230 are arranged, the first protruding portion 220, and the second protruding portion 222 (see FIG. 3) is formed.

  In addition, the said reinforcement method (construction method) is an example, Comprising: You may reinforce (construct) with another reinforcement method (construction method).

  For example, the through hole 120 may be formed after the mold 110 is installed. In this case, a concrete piece or the like generated when the through hole 120 is opened falls on the mold 110. Therefore, although a concrete piece etc. are mixed in the reinforcement part 200 (thickening part 210), if there is no problem in intensity even if it mixes, the process of this order may be sufficient. In addition, in the case of this order process, the concrete piece etc. which generate | occur | produce when opening the through-hole 120 fall on the formwork 110 as mentioned above, Therefore Prevent or reduce the stain | pollution | contamination of a lower floor (floor). Can do.

<Action and effect>
Next, functions and effects of the present embodiment will be described.

  In the present embodiment, the concrete S is placed from the upper surface 12B side of the floor slab 12 through the through hole 120 to form the reinforcing portion 200 on the lower surface 12A of the floor slab 12, so that from the lower surface 12A side of the floor slab 12 Compared with the method of performing additional reinforcement, the workability is better.

  Thus, the proof strength and rigidity of the floor slab 12 are improved by forming the reinforcing portion 200 on the existing floor slab 12, that is, by performing the lower side reinforcement.

  Further, a horizontal shearing force is transmitted between the thickened portion 210 and the floor slab 12 by the first protrusion 220 formed by filling and solidifying the concrete S in the through hole 120. In other words, the first protrusion 220 formed in the through hole 120 functions as a shear transmission of the hole cross-sectional integral of the through hole 120. Thereby, the thickening part 210 (reinforcement part 200) and the floor slab 12 are integrated more firmly. Therefore, the floor slab 12 is reinforced more strongly than the configuration in which the reinforcing portion 200 does not have the first protruding portion 220.

  From another viewpoint, the through-hole 120 formed in the floor slab 12 forms the reinforcing portion 200 (thickening portion 210) from the upper surface 12B side of the floor slab 12 to the lower surface 12A side of the floor slab 12. This also serves as a hole for placing (filling) the concrete S and a sheer cotter.

  Further, in the present embodiment, by forming the second protrusion 222 that enters the lateral hole 122 formed in the wall 16, the horizontal shearing force is also transmitted to the wall 16. Further, the load applied to the reinforcing part 200 (floor slab 12) is transmitted to the wall 16 through the second protrusion 22. Therefore, the floor slab 12 is reinforced more strongly than the configuration in which the reinforcing portion 200 does not have the second protruding portion 222.

  Furthermore, in this embodiment, the rigidity of the reinforcement part 200 (thickening part 210) can be easily adjusted by adjusting the intensity | strength and number of the reinforcing bars 230.

  Further, by forming a groove portion 50 along the wall 16 (along the X direction) in the vicinity of the joint portion (end portion) with the wall 16 on the upper surface 12B of the floor slab 12, the wall 16 in the floor slab 12 and The degree of fixation of the joint portion (end portion) decreases. Thereby, while the burden of the junction part (edge part) with the wall 16 in the floor slab 12 reduces, the reinforcement part 200 formed in the lower surface 12A of the floor slab 12 bears a moment.

  In the present embodiment, the mold 110 is not removed. And by making the formwork 110 function as a strength member (reinforcing member), the yield strength and rigidity of the floor slab 12 are improved as compared with the case where the formwork 110 is removed. Furthermore, by using a corrugated steel sheet for the mold 110, for example, the volume of the concrete S can be reduced as compared with a configuration using a flat plate for the mold, and the corrugated shape becomes a rib effectively. The yield strength and rigidity of the plate 12 can be improved.

  Further, in order to further integrate the mold 110 and the reinforcing portion 200 (thickened portion 210), a protrusion (for example, a stud) embedded in the reinforcing portion 200 (thickened portion 210) may be provided on the mold 110. Good.

<Others>
In addition, this invention is not limited to the said embodiment and variation.

  For example, in the said embodiment, although the substantially whole surface of the floor slab 12 was reinforced with the reinforcement part 200, it is not limited to this. The reinforcement part may be formed in a part of the floor slab 12 and only a part of the floor slab 12 may be reinforced.

  Further, for example, as in the first variation shown in FIG. 5, the lower surface 110A of the mold 110 may be mirror-finished with a reflective paint or the like. Then, a reflection lamp 320 may be provided in the south window 310 or the opening, and the sunlight L reflected by the reflection lamp 320 may be reflected and dispersed indoors on the lower surface 110A of the mold 110.

  Note that, as an object of reinforcing and repairing the existing floor slab 12 as in the above-described embodiment, it is possible to deal with heavy loads such as information equipment accompanying greening, IT conversion, and integration.

  For example, as in the second variation shown in FIG. 6, when the plant 400 is cultivated with a soil 400 or a solid medium that can be cultivated on the upper surface 12 </ b> B of the floor slab 12, continuous void hardening is used as a filler. By using a body, for example, water permeable concrete SS, and using a material having high water shielding properties for the mold 110 as in the present embodiment, the water sprayed on the soil 400 is drained through the first protrusion 220. In addition, water can be retained in the thickened portion 210.

  In addition, as shown in FIG. 6, the mold 110 is disposed obliquely, or a strip (not shown) is formed in the center of the mold 110, thereby indicating a two-dot broken line arrow M in the figure. As described above, the water can be drained from the end portion 110 </ b> T of the mold 110 through the wall 16. Furthermore, when the wall surface of the wall 16 is greened, the above-described drainage that travels through the wall 16 can be used.

  Moreover, when applying to greening as shown in FIG. 6, applying the 1st variation shown in FIG. 5, and setting it as the structure which reflects and disperse | distributes sunlight L toward a room | chamber interior is sufficient. Therefore, it is preferable for plant cultivation.

  Moreover, in the said embodiment, although the corrugated steel plate was used as the formwork 110, it is not limited to this. For example, a flat steel plate may be used. Alternatively, it may be a resin or wooden formwork.

  Moreover, in the said embodiment, although the formwork 110 was utilized as an intensity | strength member without removing, it is not limited to this. After the concrete S or the permeable concrete SS is solidified, the mold 110 may be removed.

  Moreover, in the said embodiment, although the reinforcing bar 230 was arrange | positioned along one direction, it is not limited to this. For example, reinforcing bars may be arranged in a lattice shape in plan view. Alternatively, reinforcing bars may also be arranged in the vertical direction. When reinforcing bars are arranged in the vertical direction, the ends of the reinforcing bars may be arranged in the first projecting portion 220 that extends into the through hole 120 formed in the floor slab 12.

  In addition, the structure by which the reinforcing bar is not arrange | positioned in the reinforcement part may be sufficient. Alternatively, a configuration in which, for example, a PC steel wire other than a reinforcing bar is arranged may be used.

  Moreover, in the said embodiment, although concrete S or water-permeable concrete SS was used as a filler, it is not limited to this. For example, fiber reinforced concrete or mortar may be used as the filler.

  Moreover, in the said embodiment, although the horizontal hole 122 which penetrates the wall 16 was opened and the 2nd protrusion part 222 was formed, it is not limited to this. A configuration in which a recess is formed in the wall 16 and the second protrusion is formed by filling the recess with a filler is also possible. That is, the second projecting portion 222 may be configured not to penetrate the wall 16. Or the structure in which the 2nd protrusion part 222 is not formed may be sufficient.

  Moreover, although the existing structure 10 was a reinforced concrete structure, it is not limited to this. For example, a steel reinforced concrete structure may be used.

  Further, the present invention can be applied to other than the reinforcement and repair of the existing floor slab 12 of the existing structure 10. That is, the present invention can also be applied to a floor slab when a structure is newly built.

  Moreover, in the said embodiment, although this invention was applied to the floor slab 12 which is a structural floor (floor slab) between an upper floor and a lower floor, it is not limited to this. For example, the present invention can be applied to floor slabs that constitute bridges and elevated roads.

Further, the above embodiment and variations can be combined as appropriate.
Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 10 Structure 12 Floor slab 16 Wall 50 Groove part 110 Formwork 120 Through-hole 200 Reinforcement part 210 Thickening part 220 1st protrusion part (protrusion part)
S Concrete (filler)
SS permeable concrete (filler)

Claims (3)

A floor slab constituting the structure;
A through hole penetrating the floor slab,
A reinforcing portion having a thickened portion formed on the lower surface of the floor slab, and a protruding portion that enters the through hole from the thickened portion;
Reinforcement structure for floor slabs.   The reinforcing structure of a floor slab according to claim 1, wherein a groove is formed along the beam or wall at or near the joint with the beam or wall constituting the structure on the upper surface of the floor slab. A through hole forming step of forming a through hole in the floor slab constituting the structure;
A formwork installation step of placing a formwork under the floor slab,
Thickening formed on the lower surface of the floor slab by filling the through hole of the floor slab with a filler into the space between the lower surface of the floor slab and the formwork and solidifying the through hole. A reinforcing part forming step of forming a reinforcing part having a part and a protruding part that enters the through hole from the thickened part,
A method for reinforcing a floor slab comprising:

Images