JP2013117089A - Cracking restriction structure for floor concrete - Google Patents

Abstract

The present invention provides a floor concrete crack control structure for floor concrete such as dirt concrete and slab concrete that does not impair the appearance of the floor surface by joints.
A floor concrete 12 and a column base 14 (structure) of a building provided on the floor concrete 12 are connected via a cushioning material 16. The cushioning material 16 is bonded around the column base 14. The column base 14 is fixed to a building foundation 22 with a bolt 24 via a base plate 18 provided at the lower end thereof, and an insulating material 32 is coated on the end of the bolt 24 protruding from the upper surface of the base plate 18 to provide floor concrete. 12 may be cut off.
[Selection] Figure 1

Description

  The present invention relates to a crack-inhibiting structure for floor concrete that suppresses the generation of cracks associated with drying shrinkage of floor concrete such as soil concrete and slab concrete for buildings.

  Conventionally, in soil concrete, as shown in FIG. 3, a crack-inducing joint 1 is provided in the soil concrete 2 in a mesh shape for the purpose of concentrating cracks accompanying expansion due to drying shrinkage or temperature difference of the concrete.

  This joint 1 is usually constructed by cutting the surface of the concrete 2 with a cutter or the like. However, in the case of a structure in which reinforcing bars such as wire mesh bars are arranged in the soil concrete 2, the joint 1 is located at the position of the joint 1. It takes time and labor to cut the reinforcing bars or to arrange the bars in advance so as to be discontinuous at the position of the joint 1, which increases the cost.

  For example, the structure of Patent Document 1 is known as an induction joint that increases the construction efficiency and reduces the labor for such problems.

  Further, the joint 1 around the column base 3 is usually arranged at a predetermined distance from the column base 3 in consideration of workability and the like.

  When constructing the soil concrete 2 around the column base 3, first, as shown in FIG. 4, after placing the joint member 4 made of cushioning material such as elastite at a position separated from the column base 3 by a predetermined distance, Prior to the outer portion of the joint member 4, the soil concrete 2 a is placed, and then the root concrete 2 b is placed around the column base 3. Finally, a finishing material 5 such as a self-leveling material is laid so as to cover the surfaces of the interstitial concrete 2a, joint members 4 and root winding concrete 2b to adjust for unevenness, and the surface is finished smoothly.

JP-A-6-240769

  By the way, it is necessary to give sufficient consideration to the appearance of the floor in a showroom such as a system kitchen. Here, in order to prevent cracks on the floor surface, when the above-mentioned crack-inducing joints are provided in the soil concrete, the joint lines float on the floor surface through the finishing material, or are placed separately across the joints. The level difference between the soil and concrete will occur, and the aesthetics of the floor will be damaged. Furthermore, when the gap is generated between the bottom surface and the floor surface of the system kitchen due to such a step, the appearance is impaired.

  The present invention has been made in view of the above, and in floor concrete for floors such as soil concrete and slab concrete, provides a crack suppression structure for floor concrete that does not impair the aesthetics of the floor surface by joints. Objective.

  In order to solve the above-described problems and achieve the object, the crack suppression structure for floor concrete according to claim 1 of the present invention connects floor concrete and a structure provided on the floor concrete via a cushioning material. It is characterized by that.

  Moreover, the crack suppression structure for floor concrete according to claim 2 of the present invention is the structure according to claim 1, wherein the structure is a column base of a building, and the cushioning material is bonded to the periphery of the column base. Features.

  Further, the crack suppression structure for floor concrete according to claim 3 of the present invention is the above-described structure according to claim 2, wherein the column base is fixed to the foundation of the building with a bolt via a base plate provided at the lower end thereof. The bolts protruding from the upper surface of the base plate are covered with an insulating material and edged with the floor concrete.

  According to the present invention, the floor concrete and the structure provided on the floor concrete are connected via the cushioning material, so that it can be used for drying shrinkage, thermal expansion, etc. in floor concrete for floor surfaces such as soil concrete and slab concrete. The accompanying displacement is absorbed by the buffer material, and the internal stress of the concrete is less likely to be restrained by the structure.

  Therefore, it is possible to suppress the cracking of the concrete without providing joints in the middle part of the floor concrete, and it is possible to provide an effect of suppressing the cracking of the floor concrete that does not impair the aesthetic appearance of the floor surface.

  In addition, since the floor concrete around the structure can be placed at a time, there is no risk of steps on both sides unlike conventional joints. Since there are no joint lines or steps on the floor surface, it is possible to provide a floor surface with a beautiful appearance in consideration of the appearance suitable for the floor surface of a showroom such as a system kitchen.

  According to another configuration of the present invention, in the configuration described above, the structure is a column base of a building, and the cushioning material is bonded to the periphery of the column base. A column base that is often provided with a boundary surface can be used.

  Moreover, workability | operativity of a column base and soil concrete is improved by setting it as the structure which adhere | attaches a buffer material around a column base. In addition, since the soil concrete around the column base can be placed at a time, there is no possibility that a step is generated on both sides unlike a conventional joint.

  According to another configuration of the present invention, in the above-described configuration, the column base is fixed to a building foundation via a base plate provided at a lower end thereof, and protrudes from the upper surface of the base plate. Since the ends of the bolts are covered with an insulating material and cut off from the floor concrete, direct contact between the floor concrete and the ends of the bolts is avoided, and cracking of the floor concrete due to restraint by the bolts is obviated. Can be prevented.

FIG. 1 is a side sectional view showing an example of a crack suppression structure for floor concrete according to the present invention. FIG. 2 is a top view showing an example of a crack suppression structure for floor concrete according to the present invention. FIG. 3 is a top view illustrating an example of a conventional crack-inducing joint structure of soil concrete. FIG. 4 is a side cross-sectional view showing an example of a conventional crack-inducing joint structure of soil concrete.

  Embodiments of a crack suppression structure for floor concrete according to the present invention will be described below in detail with reference to the drawings. In addition, although this Example demonstrates taking the case where it applies to the soil concrete of a building as an example, this invention is not limited by this Example.

  As shown in FIG. 1 and FIG. 2 (1), a crack suppression structure 10 for floor concrete according to the present invention comprises a soil concrete 12 (floor concrete) of a building and a square steel pipe provided adjacent to the soil concrete 12. A steel column base 14 (structure) is connected via a cushioning material 16.

  The steel column base 14 is fixed to a concrete foundation 22 of the building by anchor bolts 24 and fastening nuts 26 with a sandstone 20 sandwiched through a rectangular base plate 18 welded to the lower end thereof. Anchor bolts 24 are arranged at the four corners of the base plate 18.

  On the other hand, the interstitial concrete 12 constituting the floor of the room is placed on the spread sand 20 and the heat insulating material 28, and wire mesh bars 30 assembled in a lattice shape are arranged in two stages in the upper and lower sides. It is streaked.

  The cushioning material 16 is a stress load on the soil concrete 12 when the soil concrete 12 and the steel column base 14 are relatively displaced due to drying shrinkage, thermal expansion, etc. of the soil concrete 12 or deformation of the steel column base 14. It is for reducing. The buffer material 16 is integrated with the steel column base 14 by being wrapped around the steel column base 14 and bonded with an adhesive or the like.

  As the material of the buffer material 16, a sheet-like flexible material that can absorb displacement due to drying shrinkage or thermal expansion of the soil concrete 12 can be used. For example, the cushioning material 16 can be made of foamed polyethylene foam or neoprene rubber. is there. The winding thickness of the buffer material 16 can be about 15 mm, for example.

  In addition, an end portion of the anchor bolt 24 protruding from the upper surface of the base plate 18 is covered with an insulating material 32 and is edged with the surrounding soil concrete 12. By doing so, direct contact between the soil concrete 12 and the end of the anchor bolt 24 is avoided, and the occurrence of cracks due to the end of the anchor bolt 24 restraining the soil concrete 12 can be prevented in advance. . Here, as the insulating material 32, for example, a material made of foamed polyethylene can be used. 2 (1), the insulating material 32 may be continuously covered along the upper surface of the base plate 18 so as to include the end portions of the anchor bolts 24 at all four corners, or the anchor bolts at the four corners. Only 24 end portions may be covered.

  In this embodiment, an insulating material 34 is also provided on the concrete foundation 22 on the outer edge of the base plate 18. By doing so, the load of the soil concrete 12 is prevented from acting on the base plate 18 as much as possible.

  According to the crack suppressing structure 10 of the present invention configured as described above, displacement due to drying shrinkage, thermal expansion, etc. in the soil concrete 12 is absorbed by the buffer material 16, and the internal stress of the concrete 12 is restrained by the steel column base 14. It becomes difficult to receive.

  Therefore, cracks in the concrete can be suppressed without providing joints in the middle portion of the interstitial concrete 12, and the aesthetic appearance of the floor surface is not impaired as compared with the case where conventional crack-inducing joints are provided. Further, since the soil concrete 12 around the steel column base 14 can be placed at a time, there is no possibility that a step is generated on both sides unlike a conventional joint.

  In particular, according to the present invention, there is no joint line or level difference on the floor surface, and thus a floor surface having a beautiful appearance in consideration of appearance suitable for the floor surface of a showroom such as a system kitchen can be obtained.

  Moreover, according to this invention, it is set as the structure which adhere | attaches a buffer material around the column base which is often provided with soil concrete and a boundary surface. If the cushioning material 16 is wound around and integrated with the column base 14 in advance, and the construction is performed according to the procedure of placing the soil concrete 12 around this, the workability of the column base 14 and the surrounding concrete concrete 12 is improved.

  In the above embodiment, the case of the soil concrete 12 of the building as the floor concrete has been described as an example, but is not limited thereto, for example, it can be applied as slab concrete that may induce cracks on the surface, In any case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the steel column base 14 made of a square steel pipe is used as the structure. However, the structure is not limited to this. For example, the structure is made of a circular steel pipe as shown in FIG. The present invention can also be applied to the steel column base 14a, and in any case, the same operational effects as the above-described embodiment can be achieved.

  In addition, in said embodiment, in order to suppress a crack further, it is preferable to ensure sufficiently the concrete curing period after placing the soil concrete 12. For example, a sheet may be stretched around several days, a sheet may be laid on the surface, and wet curing with watering may be performed. Moreover, you may make it add a swelling agent as an admixture of the soil concrete 12.

  In addition, after curing the concrete, do not use heavy equipment such as an aerial work platform for work on the soil concrete 12 but harden the soil using light temporary scaffolding equipment such as electric rolling and ladder lifts. It is preferable not to put a burden on the concrete 12.

  As described above, according to the present invention, the floor concrete and the structure provided on the floor concrete are connected via the cushioning material, so that the floor concrete for flooring such as soil concrete or slab concrete is dried. The displacement accompanying shrinkage, thermal expansion, etc. is absorbed by the buffer material, and the internal stress of the concrete is less likely to be restrained by the structure.

  Therefore, it is possible to suppress the cracking of the concrete without providing joints in the middle part of the floor concrete, and it is possible to provide a structure for suppressing cracking of the floor concrete that does not impair the appearance of the floor surface by the joints.

  In addition, since the floor concrete around the structure can be placed at a time, there is no risk of steps on both sides unlike conventional joints. Since there are no joint lines or steps on the floor surface, it is possible to provide a floor surface with a beautiful appearance in consideration of the appearance suitable for the floor surface of a showroom such as a system kitchen.

  According to another configuration of the present invention, in the configuration described above, the structure is a column base of a building, and the cushioning material is bonded to the periphery of the column base. A column base that is often provided with a boundary surface can be used.

  Moreover, workability | operativity of a column base and soil concrete is improved by setting it as the structure which adhere | attaches a buffer material around a column base. In addition, since the soil concrete around the column base can be placed at a time, there is no possibility that a step is generated on both sides unlike a conventional joint.

  According to another configuration of the present invention, in the above-described configuration, the column base is fixed to a building foundation via a base plate provided at a lower end thereof, and protrudes from the upper surface of the base plate. Since the ends of the bolts are covered with an insulating material and cut off from the floor concrete, direct contact between the floor concrete and the ends of the bolts is avoided, and cracking of the floor concrete due to restraint by the bolts is obviated. Can be prevented.

  As described above, the crack suppression structure for floor concrete according to the present invention is useful for suppressing the occurrence of cracks due to drying shrinkage of floor concrete for floor surfaces such as soil concrete and slab concrete of a building. It is suitable for obtaining a beautifully designed floor surface that is suitable for the floor surface of a showroom such as a system kitchen by ensuring the appearance of the floor surface without providing crack-inducing joints in the middle part of the floor concrete. Yes.

10 Crack suppression structure for floor concrete 12 Dough concrete (floor concrete)
14 Steel column base (structure)
16 Buffer material 18 Base plate 20 Laying sand 22 Concrete foundation (foundation)
24 Anchor bolt (bolt)
26 Fastening nut 28 Insulation material 30 Wire mesh bar 32, 34 Insulation material

Claims (3)

  A crack suppression structure for floor concrete, wherein floor concrete and a structure provided on the floor concrete are connected via a cushioning material.   The structure for suppressing cracks in floor concrete according to claim 1, wherein the structure is a column base of a building, and the cushioning material is bonded to the periphery of the column base.   The column base is fixed to the foundation of the building via a base plate provided at the lower end thereof, and the end of the bolt protruding from the upper surface of the base plate is covered with an insulating material and is edged with the floor concrete. The crack prevention structure for floor concrete according to claim 2.

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