JP5714743B2 - Steel plate concrete structure - Google Patents

Description

The present invention relates to a steel concrete structure.

A structure may be constructed using a steel plate concrete structure in which a steel plate and concrete are integrated.
Conventionally, as shown in FIG. 5, in the steel plate concrete structure 100, the concrete body 110 and the steel plate 120 are integrally formed by placing concrete in a state where the stud bolt 121 protruding from the steel plate 120 is wound. It was.

  For example, in Patent Document 1 and Patent Document 2, a pair of steel plates provided with stud bolts are arranged in parallel with a predetermined interval in a state where the surfaces on which stud bolts are provided are opposed to each other. A construction method for forming steel plate concrete by filling concrete between the steel plates is disclosed.

  In such a conventional method for constructing a steel plate concrete structure, initial irregularities such as warpage of the steel plate concrete structure 100 due to drying shrinkage that occurs after placing concrete, and cracking may occur due to drying shrinkage. It was.

  Therefore, joints are formed in the concrete body 110 for the purpose of suppressing the drying shrinkage strain of the concrete when using concrete mixed with a shrinkage reducing agent or for absorbing the drying shrinkage strain of the concrete. There was a case.

Japanese Patent Laid-Open No. 5-44282 JP 2007-63554 A

  However, the use of a shrinkage reducing agent leads to an increase in cost, and the introduction of the joint portion into the concrete body 110 causes the joint portion to appear on the finished surface of the steel plate concrete structure 100. Therefore, the design and structure have a degree of design freedom. It had the problem of being limited.

The present invention is a technique for solving the above-mentioned problems, and is a steel plate concrete capable of constructing a high-quality and high-precision steel plate concrete structure at low cost without limiting the degree of freedom of design. to propose a structure.

In order to solve the above-mentioned problem, the invention according to claim 1 is a steel plate comprising a concrete body, embedded bolts whose head side is planted in the concrete body , and a steel plate attached to the concrete body. The embedded bolt is fixed to a reinforcing bar of the concrete body, and the steel plate has a through hole corresponding to the embedded bolt, and the embedded bolt penetrates the through hole. The steel sheet and the concrete body are supported and joined by screwing a nut to a tip portion of the bolt.

  According to such a steel plate concrete structure, a joint part or the like is not required for the concrete body, and thus the degree of design freedom is not limited. Moreover, since the steel plate is integrated with the concrete body manufactured beforehand by post-construction, it is comprised with high quality and high precision.

The invention according to claim 2 is characterized in that, in the steel plate concrete structure according to claim 1, the steel plate is attached only to one side of the concrete body .

  According to such a method for constructing a concrete structure, it is possible to maintain a state where the steel plate is in close contact with the concrete by placing the steel plate during curing of the concrete, and to form the concrete body with high quality and high accuracy. Is possible. Therefore, it is not necessary to mix a mixing material such as a shrinkage reducing agent into the concrete, and a steel plate concrete structure can be constructed at a low cost. Furthermore, since there is no need to form joint parts, the degree of freedom in design is not limited. Moreover, when the steel plate covers the surface of the concrete, the wet state of the concrete can be maintained and the drying shrinkage of the concrete can be suppressed.

Further, the construction method according to the present invention is a construction method of a steel plate concrete structure having a concrete body, embedded bolts planted in the concrete body, and a steel plate integrated with the concrete body using the embedded bolts. The step of placing concrete with the embedded bolts placed in the formwork and the bolt provided on the steel plate after placing the steel plate on the top surface of the concrete after the drying shrinkage of the concrete is stabilized A step of protruding the embedded bolt from the hole, a step of filling a filler between the concrete body and the steel plate, a step of curing the filler, and a nut screwed into the embedded bolt to tighten the nut And a step of pressure-bonding the concrete body via a steel plate and the filler.

  According to such a method for constructing a concrete structure, since the concrete body and the steel plate are integrated when the drying shrinkage of the concrete body is stabilized, the concrete shrinks uniformly, and cracks and the like are less likely to occur. Therefore, there is no need to mix a shrinkage reducing agent and the like, which is economical. Furthermore, since it is not necessary to form joints, the cover thickness of the reinforcing bars can be reduced accordingly, and the degree of design freedom is not limited.

  According to the present invention, since there is no difference in the amount of shrinkage based on the degree of restraint by the steel plate and the degree of drying, the concrete can be uniformly shrunk and cracking can be suppressed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

<First Embodiment>
In the first embodiment, as shown in FIG. 1, a concrete body 10, an embedded bolt 20 planted with one end projecting from the concrete body 10, and a steel plate 30 attached to one side of the concrete body 10, A method for constructing the steel plate concrete structure 1 having the above will be described.

  The steel plate concrete structure 1 is used, for example, as a wall member of a building, and is arranged so that the steel plate 30 side faces the inside of the building and the concrete body 10 side faces the outside of the building. In addition, the usage method etc. of the steel plate concrete structure 1 are not limited.

In this embodiment, it is assumed that the steel plate 30 is integrated on one surface side of the concrete body 10, and reinforcing bars 11, 11,... Are arranged on the other surface side with a predetermined covering.
In addition, the reinforcing bar diameter and the reinforcing bar pitch of the reinforcing bar 11 arranged in the concrete body 10 are not limited, and can be set as appropriate. Moreover, as for the steel plate concrete structure 1, the steel plate 30 may be fixed to both surfaces of the one surface side of the concrete body 10, and the other surface side.

  A plurality of embedded bolts 20 are planted in the concrete body 10 at a predetermined interval, and the steel plate 30 is integrated with the concrete body 10 via the embedded bolts 20, 20.

As shown in FIG. 2, the embedded bolt 20 is implanted in the concrete body 10 in a state where the tip end portion of the shaft portion protrudes from the concrete body 10.
On the head 21 side of the embedded bolt 20, the head 21 is embedded at a position (depth) equivalent to that of the reinforcing bar 11 so that an equivalent concrete covering of the reinforcing bar 11 arranged in the concrete body 10 can be secured. .

  Although the arrangement pitch of the embedded bolts 10 is not limited, in this embodiment, the pitch is the same as the bar arrangement pitch of the reinforcing bars 11 of the concrete body 10 (the vertical interval is the horizontal bar arrangement pitch, and the horizontal interval is the vertical bar arrangement). It should be arranged at the same interval as the muscle pitch), and placed at the center of the vertical and horizontal stripes.

  In addition, the installation method of the embedding bolt 20 is not limited, What is necessary is just to perform by a well-known means suitably. For example, the head of the embedded bolt 20 may be fixed to the reinforcing bar 11 through a binding wire.

  As shown in FIG. 2, the steel plate 30 is a steel plate material having a predetermined thickness. A bolt hole (through hole) 31 for inserting the embedded bolt 20 is formed in the steel plate 30 according to the arrangement of the embedded bolt 20 planted in the concrete body 10.

  The shape of the bolt hole 31 is preferably formed so that the clearance between the bolt hole 31 and the bolt 20 is as small as possible for the purpose of improving the transmission of stress between the embedded bolt 20 and the steel plate 30.

  The steel plate 30 is planted in the concrete body 10 and is supported and joined to the concrete body 10 by screwing nuts 22 into the embedded bolts 20 penetrating the bolt holes 31.

Next, the construction method of the steel plate concrete member according to the first embodiment will be described.
The construction of the steel plate concrete member 1 includes a concrete placing process, a steel plate placing process, and a bearing joining process.

  The placing step is a step of placing the concrete 12 in a state where the embedded bolts 20, 20,... Are arranged in the mold 13 as shown in FIG.

  Reinforcing bars 11 are pre-arranged in the formwork 13, and the embedded bolts 20 are arranged by being fixed to the reinforcing bars 11 with binding wires or the like. In addition, the fixing method of the embedding bolt 20 is not limited, What is necessary is just to perform by a well-known means suitably.

The steel plate placing step is a step of placing the steel plate 30 on the surface of the concrete 12 placed in the mold 13 in the placing step, as shown in FIG.
The placement of the steel plate 30 on the surface of the concrete 12 (the upper surface of the placement) is performed after the concrete 12 is placed and the concrete surface is leveled. The steel plate 30 is placed in a state where the embedded bolts 20, 20,... Protruding from the surface of the concrete 12 are protruded from the bolt holes 31, 31,.

In addition, formation of the bolt hole 31 may be formed in a predetermined position in advance, and when the steel plate 30 is placed on the surface of the concrete 12, the bolt hole 31 may be formed in accordance with the arrangement of the embedded embedded bolt 20. You may form in.
The steel plate 30 is formed in a shape that is the same as or slightly smaller than the surface area of the concrete body 10, and is configured such that the entire weight of the steel plate 30 acts on the concrete 12 during curing.

  As shown in FIG. 3 (c), in the support pressure joining step, the steel plate 30 and the concrete 12 are integrated by support pressure joining by tightening the nut 22 screwed into the embedded bolt 20 after the strength is developed in the concrete 12. It is a process.

As mentioned above, according to the steel plate concrete structure 1 which concerns on this embodiment, before strength develops in the concrete 12, by mounting the steel plate 30, it can suppress the drying shrinkage of the concrete 12 by covering the surface. It becomes possible. Therefore, it is possible to reduce the warpage of the steel plate concrete structure 1 due to drying shrinkage of the concrete 12, the occurrence of cracks due to shrinkage strain, and the like, and to construct a high quality steel plate concrete structure 1.
Moreover, since the concrete 12 is cured in a state where the steel plate 30 is in close contact, a gap is not formed between the concrete body 10 and the steel plate 30, and the steel plate concrete structure 1 is formed with high quality. .

  Further, since the steel plate 30 is pressure-bonded via the embedded bolt 20, it is firmly integrated with the concrete body 10. When a tensile force T is generated in the steel plate 30, the bearing stress Ta generated between the contact surface between the bolt and the steel plate and the bearing stress Tb generated between the embedded bolt 20 and the concrete body 10 resist the shear stress S. The force is transmitted from the steel plate 30 to the concrete body 10 (see FIG. 2).

Further, since it is not necessary to provide shrink joints on the surface, the cover thickness of the reinforcing bars is reduced by the amount of joints, and it is possible to make a thin wall plate-like concrete body.
In addition, since it is not necessary to add a shrinkage reducing agent to the concrete, the manufacturing cost is low.

  A level adjusting nut may be fixed to the tip of the embedded bolt 20 in order to place the steel plate 30 horizontally. At this time, the upper surface of the level adjusting nut (the contact surface with the steel plate 30) is installed so as to coincide with the surface of the concrete 12 or slightly lower than the surface of the concrete 12. It is configured to adhere to the surface. Thereby, the wet state of the concrete 12 is maintained and drying shrinkage of the concrete 12 is suppressed.

<Second Embodiment>
In the second embodiment, as shown in FIG. 4, the concrete body 10, the embedded bolt 20 planted with one end projecting from the concrete body 10, and the steel plate 30 attached to one side of the concrete body 10, A method for constructing the steel plate concrete structure 2 having the above will be described.

In this embodiment, it is assumed that the steel plate 30 is integrated on one side of the concrete body 10, and the reinforcing bars 11, 11,... Are arranged on the other side with a predetermined covering.
In addition, since the structure of the concrete body 10 is the same as the content shown in 1st Embodiment, detailed description is abbreviate | omitted.

  As shown in FIG. 4B, the embedded bolt 20 is implanted in the concrete body 10 with the tip portion of the shaft portion protruding from the concrete body 10. A level adjusting nut 23 is fixed to the tip of the embedded bolt 20. Since the structure of the other embedded bolt 20 is the same as that shown in the first embodiment, detailed description thereof is omitted.

The steel plate 30 is pressure-bonded to the concrete body 10 through embedded bolts 20, 20,... Planted in the concrete body 10 in contact with the concrete body 10 via the grout material 40.
Since the other items related to the steel plate 30 are the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  The grout material 40 is filled in a gap between the surface of the concrete body 10 and the steel plate 30. The composition of the grout material 40 is not limited and can be set as appropriate. In this embodiment, the grout material 40 is employed as the filler, but the material constituting the filler filled in the gap between the concrete body 10 and the steel plate 30 is not limited, and is appropriately selected from known materials. Adopt it.

Next, the construction method of the steel plate concrete member according to this embodiment will be described.
The construction of the steel plate concrete member 2 includes a concrete placing process, a steel plate arranging process, a filling process, and a bearing joining process.

As shown in FIG. 4A, the placing step is a step of placing the concrete 12 in a state where the embedded bolts 20, 20,.
A level adjusting nut 23 is installed in advance at the tip of the embedded bolt 20.
Since other matters related to the placing process are the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  As shown in FIG. 4 (b), the steel plate placing step is performed along the surface of the concrete body 10 (concrete 12) after the drying shrinkage of the concrete 12 placed in the mold 13 is stabilized in the placing step. This is a step of arranging the steel plate 30.

  The steel plate 30 projects the embedded bolts 20, 20,... Projecting from the surface of the concrete body 10 (the upper surface of the casting) from the bolt holes 31, 31,. By being placed on the upper surface of the level adjusting nut 23, it is arranged at a position where a predetermined gap is left from the surface of the concrete body 10.

The filling step is a step of filling the grout material 40 into the gap formed between the concrete body 10 and the steel plate 30.
The grout material 40 is filled by injecting the grout material 40 from a filling hole formed in the steel plate 30 in advance. In addition, the filling method of the grout material 40 is not limited, and may be appropriately selected from known methods.

  As shown in FIG. 4 (b), the support pressure joining process is performed by tightening the nut 22 screwed into the embedded bolt 20 after the strength is developed in the grout material 40 filled in the gap between the concrete body 10 and the steel plate 30. The steel plate 30 and the concrete 12 are integrated by bearing joint.

  As described above, according to the steel plate concrete structure 2 according to the second embodiment, the concrete body 10 and the steel plate 30 are integrated after the drying shrinkage of the concrete 12 is stabilized. In addition, the occurrence of cracks in the concrete body 10 can be reduced, and a high-quality steel plate concrete structure 1 can be constructed.

  Even if the surface of the concrete body 10 is uneven due to drying shrinkage of the concrete 12 or the like, the gap between the concrete body 10 and the steel plate 30 is filled with the grout material 40 (filler), which hinders integration. I will not bring you.

  Further, since the steel plate 30 is pressure-bonded via the embedded bolt 20, it is firmly integrated with the concrete body 10. When a tensile force T is generated in the steel plate 30, the bearing stress Ta generated between the contact surface between the bolt and the steel plate and the bearing stress Tb generated between the embedded bolt 20 and the concrete body 10 resist the shear stress S. The force is transmitted from the steel plate 30 to the concrete body 10 (see FIG. 2).

Moreover, since it is possible to manufacture a steel plate concrete structure with high accuracy and high quality without requiring joints or the like, the degree of freedom in design is high.
In addition, since it is not necessary to add a shrinkage reducing agent to the concrete, the manufacturing cost is low.

The preferred embodiments according to the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, the concrete structure shown in each of the embodiments has been described with respect to the case where it is configured by a so-called single bar arrangement in which reinforcing bars are arranged only on the side opposite to the steel plate. The configuration of the concrete body is not limited to the above configuration.

  Moreover, the use of the steel plate concrete structure which concerns on this invention is not limited, It can employ | adopt as a precast member of various concrete structures.

  Further, the steel plate concrete structure may be constructed in a factory or the like by integrating the steel plate with a prefabricated concrete body by bearing joint. In this case, embedded bolts are implanted in the concrete body in a state where one end protrudes in advance, and a nut is inserted in a state where the embedded bolt penetrates a through hole of a steel plate formed corresponding to the position of the embedded bolt. Supporting pressure is joined by screwing.

It is a perspective view which shows the steel plate concrete structure concerning suitable embodiment of this invention. It is an expanded sectional view which shows the steel plate concrete structure shown in FIG. (A)-(c) is sectional drawing which shows each step | level of the construction method of the steel plate concrete structure which concerns on 1st Embodiment. (A)-(b) is sectional drawing which shows each step | level of the construction method of the steel plate concrete structure which concerns on 2nd Embodiment. It is sectional drawing which shows the conventional steel plate concrete structure.

1, 2 Steel plate concrete structure 10 Concrete body 12 Concrete 20 Embedded bolt 30 Steel plate 40 Grout material (filler)

Claims (2)

And the concrete body,
Embedded bolts whose head side is implanted in the concrete body,
A steel concrete structure and a additionally provided steel plate to the concrete body,
The embedded bolt is fixed to the reinforcing bar of the concrete body, and the steel plate has a through hole corresponding to the embedded bolt,
A steel plate concrete structure, wherein the steel plate and the concrete body are pressure-bonded to each other by screwing a nut into a front end portion of the embedded bolt that penetrates the through hole.
The steel plate concrete structure according to claim 1, wherein the steel plate is attached only to one side of the concrete body.

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