KR20150104542A - H-Pile for Concrete Structure - Google Patents

Abstract

According to the present invention, an H-pile for a concrete structure comprises: a lower support unit disposed on a lower portion of a civil structure or an architectural structure, and having a lower web and a pair of flanges disposed perpendicular to both sides of the lower web; an upper web disposed inside the concrete of the civil structure or the architectural structure, and extended upwards from the lower web; and an upper support unit relatively reducing a secondary moment of the cross-section per unit area and strength when compared with the lower support unit having the flanges to prevent damage of the concrete.

Description

H-file for concrete structures {H-Pile for Concrete Structure}

The present invention relates to an H-file for a concrete structure, and more particularly, to an H-file for a concrete structure, and more particularly, to an H-file for use in a foundation construction of a civil engineering or building structure, which reduces stress concentration and rigidity generated in the concrete, To an H-file for a concrete structure.

In the case where the target ground to be used for civil engineering or building construction is a soft ground, a foundation improvement method such as a chemical solution injection method, a pile foundation reinforcement method using a concrete or steel pipe file, etc., After the foundation has been improved, the frame of the upper structure is connected to the top of the pile head, and then the concrete for the column connected to the pile concrete or steel pipe pile is laid.

The upper length of the H-file inserted into the base of the civil engineering or building structure, such as a bridge turn, is required to be at least one time the largest cross-sectional dimension of the H-file. In the upper part of the H-file embedded in concrete, the local earth pressure stress due to the alternating displacement caused by the expansion and contraction of the upper structure due to the ambient temperature change, the passive earth pressure caused by the alternating displacement and the horizontal force or bending moment acting on the H- , Which causes adhesion failure between the concrete and the H-file, and ultimately destroys the concrete along the flange surface of the H-file, as well as fractures to the outer side of the concrete. have.

In addition, the concrete in which the H-file is embedded is confined by the flanges and webs on both sides of the H-file. When the load or vibration acting vertically at the top or the attachment surface of the concrete and H- The restraint effect of the filled concrete can be reduced to reduce the structural performance against the working vertical load and cause a problem in the resistance mechanism at the joint.

KR0233313 20

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce stress concentration and rigidity generated in the concrete of H-files used for foundation work of civil engineering or building structures, It is an object of the present invention to provide an H-file for a structure.

In order to accomplish the object of the present invention, an H-file for a concrete structure is disposed at a lower portion of a civil engineering or building structure and includes a lower web and a pair of flanges vertically arranged on both sides of the lower web, And an upper web disposed within the concrete of the civil engineering or building structure and extending upwardly from the lower web, wherein the lower web has a relatively greater moment of inertia and a lower stiffness than the lower stiffage including the pair of flanges, And an upper support portion for preventing the concrete from being damaged.

In addition, the upper web may be chamfered or rounded to reduce the concentration of stress applied to the concrete.

In addition, a support plate corresponding to an end surface of the H-file may be further provided on an interface between the lower support portion and the upper support portion.

Further, a groove may be formed on one side of the flange of the lower support portion of the H-file embedded in the paper.

In another category, the H-file for a concrete structure for achieving the object of the present invention comprises a web and a pair of flanges vertically disposed on both sides of the web, the lower part being disposed on the lower ground of the civil engineering or building structure, An upper portion is formed on an H-file disposed in the concrete of the civil engineering or building structure and a lower portion of the flange embedded in the ground so that the rigidity of the upper portion of the H-file disposed in the concrete is disposed on the ground And a groove that is relatively larger than the lower stiffness of the H-file to reduce the rigidity of the H-file outside the concrete and to facilitate horizontal displacement.

The present invention has the following effects.

First, since the upper part of the H-file embedded in the concrete is made of only the web, the number of the edges of the H-file having a relatively higher stiffness is reduced compared to the concrete, thereby reducing the local stress, thereby reducing the splitting tensile failure The bearing failure can be minimized.

Second, the corner of the upper web of the H-file is chamfered or rounded to minimize the stress concentration, thereby further reducing the risk of damage to the concrete.

Third, a support plate is provided between the upper part made of only the web and the part made of the web and the flange, thereby facilitating the pouring of the concrete, improving the vertical force of the H-pile, and facilitating the load support of the poured concrete have.

Fourth, by forming a stud at the center of the web embedded in concrete, it is possible to improve the constraining effect of the concrete and the H-file, improve the pull-out resistance of the H-file, and improve the resistance to the horizontal force. That is, the volume and mass are reduced as compared with the conventional H-file. However, as the studs are provided, the constraining effect of the concrete and the H-file is improved as compared with the conventional H-file, The H-file and the concrete are firmly restrained.

Fifth, a plurality of grooves are formed in the lower flange of the H-pile buried in the soil, thereby reducing the stiffness of the H-pile outside the concrete and facilitating horizontal displacement.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
1 is a perspective view of an H-file according to the present invention;
FIG. 2 is a perspective view of an H-file according to a modification of the present invention; FIG.
3 is a perspective view of an H-file according to another modification of the present invention;
4 is a perspective view of an H-file according to another modification of the present invention;
5 is a perspective view of an H-file according to another modification of the present invention;
6 is a perspective view of an H-file according to another modification of the present invention; And
7 is a use state diagram of an H-file according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of an H-file according to the present invention. 1, the lower portion of the H-Pile 10 according to the present invention includes a lower web 100 and a pair of flanges 200 And the upper portion of the H-file 10 is composed of only the upper web 100 which is removed from the flange 200 and extends upwardly from the lower web 100. At this time, the length of the upper supporting portion of the H-pile 10 made of only the upper web 100 with the flange 200 removed is longer than the length of the upper supporting portion of the concrete 500, And preferably 400 mm to 500 mm, and preferably 450 mm. In the existing H-file, there are four upper corner portions of the flange, stress concentration occurs at this portion, and consequently, the concrete 500 having a relatively low rigidity is damaged. However, since the H-file 10 according to the present invention includes only the upper web 100 without the flange 200 on which the concrete 500 is installed, the stiffness of the H- So that the damage of the concrete 500 can be minimized. The stiffness can be calculated by the following equation (1).

Where E is the modulus of elasticity and I is the moment of inertia of the cross section.

1 and the second moment of inertia of the H-file 10 according to the present invention with respect to the X-X axis shown in FIG. 1 will be compared. The secondary moment of inertia of the H-file in which the conventional flange is formed can be calculated by the following formula (2).

On the other hand, the moment of inertia of the H-file 10 according to the present invention can be calculated as shown in the following equation (3).

Here, Equation (2) and an equation 3] I _xx is a moment of inertia about the XX axis, D is the web width, t _w is the thickness of the web, t _f is the thickness, b _f of the flange Means the width of the flange.

Since the flange 200 of the H-file 10 is removed in Equation (3) and there is no value of the second moment of the section generated in the flange 200 , The I _xx value is relatively decreased as compared with the conventional H-file. Therefore, the stiffness is also reduced by [Equation 1].

2 is a perspective view of an H-file according to a modification of the present invention. As shown in FIG. 2, in order to alleviate the stress concentration occurring at the corner portion of the upper web 100 of the H-file 10 having the above-described configuration, chamfering of corners is performed to relieve stress concentration, Can be minimized. Although it has been described in the drawings and the description of the present invention as a chamfer, it is obvious that a corner portion may be rounded round instead of a chamfer. At this time, it is preferable to chamfer the chamfer with a length of 80 mm to 120 mm, preferably 100 mm, and the length of the chamfer can be freely changed according to the size of the H-file 10.

3 is a perspective view of an H-file according to another modification of the present invention. 3, the H-file 10 according to another embodiment of the present invention includes an upper web 100 without a flange 200, And a support plate 300 corresponding to the end surface. By providing such a supporting plate 300, the vertical force of the H-pile 10 is improved, and the concrete 500 can be easily poured. In addition, since the support plate 300 supports the bottom surface of the concrete 500 on which the concrete pavement 500 is installed, it is easy to support the load of the concrete 500. At this time, the thickness of the support plate 300 is preferably 10 mm to 20 mm, and preferably 15 mm.

4 is a perspective view of an H-file according to another modification of the present invention. 4, the H-file 10 according to another embodiment of the present invention has a through hole formed at one side of the central portion of only the upper web 100 on the upper side, and a stud 400 is formed on the through hole . At this time, the stud 400 inserted into the through hole may be coupled through welding or the like, and the stud 400 may be integrally manufactured at the time of manufacturing without forming a through hole. As the stud 400 is formed, horizontal resistance, which is resistance to horizontal forces and moment such as shaking of civil engineering or building structures, is increased. Since the concrete 500 is filled up and down with the stud 400, the pile is not released to the outside of the concrete 500 upon settlement of the soil, but consists only of the upper web 100, The contact area of the concrete 500 is reduced, but the restraining effect of the concrete 500 can be rather improved.

5 and 6 are perspective views of an H-file according to another modification of the present invention. 5, the H-file 10 according to another embodiment of the present invention reduces the stiffness of the H-file 10 outside the concrete 500 and the H-file 10 A plurality of grooves 210 are formed in the flange 200 of the lower support portion where the lower web 100 and the flange 200 are formed. Since the plurality of grooves 210 are formed in the flange 200 embedded in the ground, the stiffness of the H-pile 10 outside the concrete 500 is reduced, and horizontal displacement is facilitated. This lateral displacement (lateral displacement) is easily generated when the portion of the H-file 10 disposed inside the concrete 500 is relatively stiff than the portion embedded in the ground. That is, the inner stiffness of the H-file 10 must be greater than the outer stiffness of the H-file 10 in order to facilitate horizontal displacement. However, as shown in FIG. 5, in the case where only the upper web 100 is disposed within the concrete 500, compared with the lower supporting portion where the rigidity of the portion disposed in the concrete 500 is embedded in the ground, Since the stiffness is relatively small, horizontal displacement may not be easy. Therefore, as shown in FIG. 6, in order to make the rigidity of the portion disposed inside the concrete 500 relatively larger than the stiffness of the portion embedded in the ground, the H-file 10 disposed inside the concrete 500, The upper support portion of the web 100 may be formed with both the web 100 and the flange 200 like the lower support portion. When the upper support portion is formed of the web 100 and the flange 200 like the lower support portion, the upper support portion and the lower support portion have the same rigidity. However, the plurality of grooves 210 are formed in the flange 200 portion of the lower support portion. The rigidity is relatively small as compared with the upper support portion, and horizontal displacement becomes easy. At this time, the plurality of grooves 210 are semi-elliptical along the longitudinal direction of the H-file 10. However, the shape of the grooves 210 is not limited to the semi-elliptical shape, and may be variously formed in consideration of the mode of use, the state of the soil in which the H-file 10 is embedded, and the like.

7 is a use state diagram of an H-file according to the present invention. 7, a portion of the H-file 10 having the above-described structure, in which both the lower web 100 and the flange 200 are provided, that is, the lower support portion which is the lower portion of the support plate 300, Buried. At this time, since the plurality of grooves 210 are formed in the flange 200 of the H-pile 10 embedded in the ground, the horizontal displacement of the H-pile 10 is easy and the rigidity at the ground is reduced.

The upper part of the support plate 300, that is, the flange 200 is removed, and the concrete 500 of the civil engineering or building structure is installed on the upper support part composed only of the web 100. At this time, since the upper portion of the H-file 10 is composed of only the upper web 100 and the corner portion of the upper web 100 is chamfered, the rigidity and the concentration of stress are reduced to minimize the breakage rate of the concrete 500 . In addition, since the stud 400 is provided, the horizontal resistance against the shaking of the civil engineering or building structure is improved.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: H-file
11:
12: upper support
110: Lower web
120: upper web
200: Flange
210: Home
300: Support plate
400: Stud
500: Concrete

Claims (5)

A lower support portion disposed at a lower portion of the civil engineering or building structure and including a lower web and a pair of flanges vertically disposed on both sides of the lower web; And
And an upper web disposed within the concrete of the civil engineering or building structure and extending upwardly from the lower web, wherein the lower web has a relative moment of inertia and a stiffness in comparison with the lower supported portion including the pair of flanges. An upper support for preventing the concrete from being damaged;
H-file for concrete structures including The method according to claim 1,
The upper web is an H-file for a concrete structure in which corner portions are chamfered or rounded to relieve stress concentration on the concrete. The method according to claim 1,
And a support plate corresponding to an end surface of the H-file is further provided at an interface between the lower support portion and the upper support portion. The method according to claim 1,
The H-file for a concrete structure in which a groove is formed on one side of the flange of the lower support portion of the H-file embedded in the ground. An H-file comprising a web and a pair of flanges vertically disposed on both sides of the web, the lower portion being disposed on the lower ground of the civil engineering or building structure and the upper portion being disposed in the concrete of the civil engineering or building structure; And
The upper rigidity of the H-file formed on the lower side of the flange embedded in the paper is greater than the lower rigidity of the H-file disposed on the ground, A groove for reducing stiffness outside the concrete and facilitating horizontal displacement;
H-file for concrete structures containing concrete.

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