JP3099110B2 - Concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a concrete structure, such as very large civil engineering or building structures shearing force acts.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing a concrete structure, a concrete composite structure in which steel and concrete are combined has been known. The concrete composite structure cuts off the shearing force generated at the joint surface between steel and concrete by the adhesive force of the contact surface between steel and concrete in order to obtain large bending and shear strength and deformation capacity against external force. Need to be transmitted and absorbed without However, when a huge external force acts on the concrete composite structure and a large shear force is generated at the interface between the steel material and the concrete, the adhesive force at the interface between the steel material and the concrete is cut off. Therefore, in the concrete composite structure, in order to transmit sufficient shearing force between the steel material and the concrete, and to obtain sufficient bending and shearing strength and deformation capacity, the shearing force is prevented from shifting, and the appropriate transmission of shearing force is performed. Need to be applied. As shown in FIGS. 8 and 9, as a means for transmitting the shearing force, it is known to arrange a projection such as a stud dowel c or a mold steel d between a steel plate a and a concrete b. With the stud dowel c and the mold steel d, the contact surface of the steel material a with the concrete b is increased, and a hook to the concrete b is provided to increase the adhesion surface thereof. Thereby, it is widely practiced to transmit shear stress between steel material and concrete.

[0003]

As described above, the conventional concrete composite structure increases the proof stress by transmitting the shear force generated between the steel material and the concrete. Therefore, it is necessary to attach a stud dowel or a model steel to the steel material. However, the work of attaching the stud dowel or the mold steel to the steel material is a complicated and requires a secure attachment strength, and requires a lot of skilled labor and time. Therefore, development of a concrete structure that easily integrates steel and concrete, can sufficiently transmit shear stress, is excellent in bending and shear strength and deformation capacity, and can sufficiently secure safety has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to easily integrate steel and concrete, to withstand an extremely large static or impact external force, excellent co-to deformation capacity
It is to provide a concrete structure .

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a
Concrete screw with cleat-filled structure
The lid that is placed on the pile head of the pile
The concrete in the hole formed in the cylindrical part
By placing concrete that is continuous with the torsion pile
The torque transmission capability.
Provide a cleat structure.

[0006]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The concrete structure comprises a plate 1 having a perforated structure and concrete 2 located in contact with the plate 1.

<B> Plate Body As shown in FIG. 1, the plate body 1 is arranged in the concrete 2 so that the plate body 1 has an adhesion stress fbook and a shear stress which are reaction forces of a shear force generated by an external force F1 to the concrete structure. It is a reinforcement for receiving τa. The plate 1 is not limited to steel, but may be made of a fiber-reinforced plastic (CFRP, carbon aramid, or the like) that is a material having a large ultimate strength and a large elongation limit. Plate 1
Has a hole 11 for the concrete 2 to be described later.
The joint 3 between the plate 1 and the concrete 2
Are made uneven to achieve integration. The plate 1 may be disposed at an angle to the axis of the concrete structure, such as a known bending bar, which is a reinforcing member used for a known reinforced concrete structure, or may be an axis of the concrete structure, such as a hoop bar. It is conceivable to arrange the device vertically. The plate 1 is not limited to the above-described embodiment, but may be any as long as it has an appropriate hole so that the joint 3 with the concrete 2 to be poured is fitted into the concave and convex. Further plate 1
When the plate 1 is placed in the concrete 2 by opening the holes 11 in the concrete 2, the concrete 2, 2 located on both sides of the plate 1 can be formed into a continuous and integral structure.

<C> Concrete Concrete 2 is a plate body 1 having the above-described holes 11 formed therein.
Position. The concrete 2 fills the holes 11 of the plate 1 and is integrated. At this time, due to the structure of the concrete structure, as shown in FIG.
Various configurations are conceivable, such as a configuration in which the concrete 2 is cast on only one side surface, and a configuration in which the concrete 2 is cast on both side surfaces of the plate 1 as shown in FIG.

[0010]

Operation 1 Next, the characteristics of the concrete structure will be described.

In the concrete structure, since the plate 1 is joined to the concrete 2, the concrete 2 flows into each hole 11 of the plate 1, and the joint 3 between the plate 1 and the concrete 2 is inevitable. In this structure, the irregularities of the plate 1 and the irregularities of the concrete 2 are fitted. Therefore, as shown in FIG. 1, when an external force F1 is applied to the concrete structure, a shearing force is generated at the joint 3 between the plate 1 and the concrete 2 due to the external force F1. At this time, a shear stress τa of the concrete convex portion is generated in the joint portion 3 between the plate 1 and the concrete 2 in addition to the adhesive stress fbook which is a reaction force of the shear force τ. Thereby, high integrity is generated between the plate 1 and the concrete 2.

That is, in the process of shear failure of the concrete 2, the shear force τ is transmitted by the adhesion stress fbook and the shear stress τa generated at the joint portion 3 between the plate 1 and the concrete 2, whereby the plate 1 and the concrete 2 are transmitted. By maintaining the adhesive force between the shear force and the shear force τ, the shear force τ can be absorbed. Therefore, the concrete structure is not easily damaged by a large external force. 1 and 2 illustrate an example in which the plate 1 is disposed perpendicular to the axis of the concrete structure in order to explain the shear stress of the plate 1, but the present invention is not limited to this example. As shown in FIG. 3, even when the plate body 1 is arranged to be inclined, the same resistance can be obtained with respect to the oblique tensile force due to the shearing force.

[0013]

Embodiment 2 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<A> Overall Configuration FIG. 3 is an explanatory view of a concrete structure using the cylinder 4. The concrete structure includes a predetermined number of plate bodies 1 in a cylindrical body 4.
And the tension member 5 are arranged, and the inside of the cylindrical body 4 is filled with the concrete 2. Hereinafter, each unit will be described.

<B> Cylindrical body The cylindrical body 4 is a member that becomes an outer shell of the concrete structure. As the cylindrical body 4, a steel pipe having a circular or square cross section can be adopted.

<C> Plate Body As shown in FIG. 3, the plate body 1 is a reinforcing member that is arranged in the cylindrical body 4 and receives a shearing force generated by an external force applied to the concrete structure. The plate 1 is a member corresponding to a bending streak or a stirrup streak which is a reinforcing material employed in a conventional beam or the like constructed by casting concrete. Therefore, it is conceivable that the plate 1 is not limited to a steel plate, but may be formed of a fiber-reinforced plastic (CFRP, carbon aramid, or the like) that is a material having a large ultimate strength and a large elongation limit. As shown in FIG. 4, a large hole 12 is formed in the plate 1, and a plurality of small attachment holes 13 and an insertion hole 14 for a tensile material 5 described later are also formed around the large hole 12, as necessary. The integration with the concrete 2 to be filled in the cylindrical body 4 partitioned by the plate body 1 is achieved. The plate body 1 is arranged to be inclined with respect to the axis of the cylindrical body, such as a bending line which is a reinforcing member used for a known beam material,
It is conceivable to dispose it upright with respect to the axis of the cylinder like a stirrup streak. The plate 1 is not limited to the above-described embodiment, but may be any as long as it has an appropriate hole so that the joint between the plate 1 and the concrete 2 to be filled in the cylindrical body 4 is fitted in an uneven manner.

<D> Tensile material The tensile material 5 is provided on the side of the concrete structure on which tensile stress acts. The tension member 5 is arranged by pushing the above-described hole formed in the plate 1 or by forming a dedicated insertion hole 14 and inserting the same through the plate 1. As the tensile member 5,
Use rebar or unbonded type PC steel.
When a steel material is used, it is fixed to the supporting plates 51 provided at both ends via a fixing tool 52. It is preferable that the tension member 5 is arranged so as not to be loosened, so that a prestress is introduced when the concrete structure is bent.

[0018]

[Action 2] Next, the characteristics of the concrete structure will be described.

FIG. 3 shows a concrete structure in which an external force acts near the center. Due to the external force F2, a compressive force F3 works in the horizontal direction on the upper side of the concrete structure, and a tensile force T works on the lower side. At this time, the cylindrical body 4 which is the outer shell of the concrete structure exerts a confined effect on the concrete 2 compressed in the axial direction inside the cylindrical body. That is, since the expansion force in the lateral direction of the concrete 2 inside the cylindrical body 4 is restrained by the cylindrical body 4, the compressive strength of the concrete 2 increases and the bending strength of the cylindrical body 4 increases.

As shown in FIGS. 5 and 6, the concrete structure has a hole 12 and an attachment hole 13 in the plate 1 by disposing the plate 1 in the cylinder 4 in addition to the confining effect. But concrete 2 is flowing in,
The joint between plate 1 and concrete 2 is inevitably plate 1
And the irregularities of the concrete 2 are fitted. The compressive and tensile forces generated in concrete structures are:
It acts as a shearing force for joining the plate 1 and the concrete 2. At this time, at the joint between the plate 1 and the concrete 2, in addition to the adhesive stress fbook which is a reaction force of the shearing force τ, a shearing stress τa of the concrete convex portion is generated. Thereby, high integrity is generated between the plate 1 and the concrete 2. That is, in the process of shear fracture of the concrete 2, the shear force τ is transmitted by the adhesion stress fbook and the shear stress τa generated at the joint portion 3 between the plate 1 and the concrete 2, whereby the gap between the plate 1 and the concrete 2 is increased. The shear force τ can be absorbed by maintaining the adhesive force of. Therefore, the concrete structure is not easily damaged even by a large external force. 5 and 6, in order to explain the shear resistance of the plate 1, an example in which the plate 1 is disposed perpendicular to the axis of the concrete structure has been described. However, the present invention is not limited thereto. As shown in FIG. 3, even when the plate 1 is arranged at an inclination, the same adhesive stress and shear stress can be obtained.

[0021]

Third Embodiment In a second embodiment of the present invention, an example is described in which a tubular body having a circular cross-sectional shape such as a steel pipe is used as a tubular body. In addition, it is conceivable to adopt a tubular body having a rectangular cross-sectional shape, in which case the shape of the reinforcing body is also rectangular, so that the shear resistance is equivalent to that of the concrete composite structure described in the first embodiment. Can be transmitted.

[0022]

Embodiment 4 An embodiment in which the present invention is applied to the structure of a concrete torsion pile will be described. FIG.
As shown in the figure, the concrete torsion pile 6 installed by rotating the pile head and screwing it into the soil is constructed by attaching a pile head 62 to a concrete pile body 61. When the concrete torsion pile 6 is installed, the pile head 62 is required to have an adhesive stress against the shearing force even if an excessive rotation torque acts. More specifically, it is conceivable that a transmission cylinder 621 is formed at the lower end of the pile head 62 attached to the end 63 of the pile 61 and a hole 622 is formed in the transmission cylinder 621. That is, the concrete 2 of the pile 61 and the transmission cylinder 621
The pile head 62 is attached so that the two are integrated. As a result, the concrete 2 is positioned in the hole 622 of the transmission cylinder 621 so that the pile body 61 and the pile head 62 are integrated.
This makes it possible to transmit the shearing force generated in the transmission cylinder portion 621 due to excessive rotation torque applied to the pile head 62 when the concrete torsion pile 6 is installed to the pile body 61 as shearing stress. Therefore, by giving a rotational torque to the pile head 62, the concrete torsion pile 6 can be screwed into the soil and installed. The shape of the pile head 62 shown in FIG. 7 is not limited to this, and a known shape may be adopted.

[0023]

As described above, the present invention has the following effects. <A> In a composite structure of steel and concrete, integration can be easily achieved. <B> In a concrete structure composed of steel and concrete, by opening holes in the steel and improving the integrity of the concrete, the bonding stress and shear stress generated at the joint between the steel and concrete are reduced. By transmitting the shearing force (external force), the shearing force could be absorbed by maintaining the adhesive force between the steel material and the concrete, and the concrete structure was not damaged. <C> The concrete structure has sufficient deformation, without losing its strength rapidly after reaching the maximum yield strength due to its excellent toughness due to its good integration with the filled concrete, while the plate is placed in the cylinder. Because it has the ability, it can absorb energy sufficiently. For this reason, it was not easily damaged by an excessive external force. <D> Stirrup streaks and bent streaks used when constructing a conventional concrete structure could not be arranged in the cylinder, but by arranging the reinforcing body of the present invention in the cylinder. It has become possible to obtain the same or higher shear stress.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view 1 of a concrete structure according to the present invention.

FIG. 2 is a longitudinal sectional view 2 of a concrete structure according to the present invention.

FIG. 3 is a longitudinal sectional view of a concrete structure according to Embodiment 2 of the present invention.

FIG. 4 is a perspective view of a plate according to a second embodiment of the invention;

FIG. 5 is an explanatory diagram 1 of shear stress of a concrete composite structure.

FIG. 6 is an explanatory diagram 2 of shear stress of a concrete composite structure.

FIG. 7 is an explanatory view of a concrete pile according to Embodiment 4 of the present invention.

FIG. 8 is an explanatory view of a concrete structure using a stud dowel.

FIG. 9 is an explanatory view of a concrete structure using a mold steel.

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI E04C 5/06 E04C 5/06 (56) References JP-A-63-63898 (JP, A) JP-A-59-21853 (JP, A) JP-A-5-321403 (JP, A) JP-A-5-272195 (JP, A) JP-A-8-120830 (JP, A) JP-A-6-158714 (JP, A) (JP, U) Patent 2631971 (JP, B2) Registered utility model 3008137 (JP, U) JP-B-53-27569 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5 / 56 E02D 7/22 E04C 5/06 E04C 3/20 E04C 3/293 E04C 3/34

Claims (1)

(57) [Claims] 1. A structure in which a cylinder is filled with concrete.
To be placed on the pile head of a concrete torsion pile
By forming a cylindrical part with a perforated structure in the
Concentrate with concrete torsion pile in the formed hole
Positioning the REIT enhances torque transmission capacity
A concrete structure characterized by being made to work.