KR101663135B1 - H-type steel girder for reducing the steel use - Google Patents

Abstract

The present invention relates to an H-type steel girder which is able to reduce an amount of steel used by effectively responding to a size or a type of stress applied to a beam structure of a building. The steel girder comprises: bracket end steel frames placed on both end portions; and a central steel frame placed between the bracket end steel frames, having a smaller length than that of the bracket end steel frames. A mounting portion in which the central steel frame is placed is formed in an end portion connected and bonded to the central steel frame of both end portions of the bracket end steel frames. An end portion of the central steel frame is mounted on the mounting portion to be connected and bonded to the bracket end steel frames.

Description

H-TYPE STEEL GIRDER FOR REDUCING THE STEEL USE

The present invention relates to a steel girder for constructing a beam structure of a building, and more particularly, to an H-shaped steel girder which can reduce the amount of steel used by effectively coping with the magnitude and kind of stress acting on the beam structure .

The steel frame structure is widely used due to its very high rigidity, excellent assembling ability, cross-sectional shape and bonding method while lightening the structure. Especially, it is very advantageous in construction and long span building of high-rise buildings for improving the land utilization ratio .

However, in the beam structure which is rigidly connected to the vertical member such as the column, the maximum moment of bending moment is generated at both ends, and the longitudinal moment is generated at the center portion, and the momentum of both ends is about 60% It is common that it occurs larger.

Therefore, efforts have been made to reduce the amount of steel used by having an optimum cross-section according to the stress acting on the member. As a typical example thereof, as shown in Fig. 1, the tensile stress generated by the bending A method of changing the thickness of the flange so as to make the girder and a method of making the dances of the both ends and the center of the girder different from each other as shown in Fig.

However, since the type of the cross-section girder according to the prior art shown in Fig. 1 is not easy to fabricate the steel frame steel in which the thickness of the upper and lower flanges is changed, it is practically easy to correspond to the standard of the girders to be designed differently according to the scale of the building There is a problem that the manufacturing cost is greatly increased.

On the other hand, in the prior art shown in FIG. 2, a bracket steel frame 30 is attached to a column, and a steel frame girder member is connected to the bracket steel frame 30 by using a joint plate and a bolt, , And the steel girder members are formed by joining both end steel bars 10 and a center steel bar 20 which are different in dancing.

Therefore, the type of the sectioned girder according to FIG. 2 is manufactured by cutting steel-framed steel produced as a finished product, so that it is possible to produce a girder having a section with a higher degree of applicability than that of FIG. 1, It has the advantage of being able to. However, the prior art of FIG. 2 has a separate jointing operation for installing a steel girder member and a jointing operation for changing the cross-section of the girder, thereby increasing costs due to an increase in the number of process steps and increasing the number of points of concern have.

JP 6-288033 A KR 10-0996604 B1

It is an object of the present invention to solve the problems of the prior arts described above and to provide a method of manufacturing an optical fiber having an optimum cross section while minimizing the location of joints, The present invention provides a steel-frame-reduced H-shaped steel frame girder.

Further, the present invention provides a universal steel type H-type steel frame girder which can realize a slim floor and can be applied to girders having various sizes and shapes by changing the degree or shape of the section of the girder. There is a purpose.

According to a preferred embodiment of the present invention to solve the above-described problems, the present invention provides a bracket comprising: a bracket end steel frame disposed at both ends of the bracket; and a central steel frame located between the bracket end steel frames and having a smaller dancing than the bracket end steel frame, And a bracket having a mounting portion on which a central steel frame is placed is formed at an end of the bracket end frame which is jointed to the central steel frame and the bracket is connected to the bracket end frame in a state where an end of the center frame is mounted on the mounting portion A steel-frame-type H-type steel frame girder is provided.

At this time, the mounting portion may be configured such that the abutment portion and the support portion are orthogonal to each other to have a "B" shape, and the abutment portion, the upper portion of the upper portion of the abutment portion and the lower portion of the abutment portion, .

According to another embodiment of the present invention, the web of the bracket end portion steel frame is provided with a horizontal reinforcing plate in the longitudinal direction and a vertical reinforcing plate in the vertical direction, and the horizontal reinforcing plate is installed inward from the lower end of the fitting portion, And the vertical reinforcing plate is provided so as to be in contact with the inner end of the horizontal reinforcing plate.

According to another embodiment of the present invention, an end reinforcing plate is provided at an outer end of the support portion, and a vertical reinforcing plate perpendicular to the web of the central steel frame is installed. The end reinforcing steel plate has a straight line The steel-frame-reduced H-type steel frame girder is provided so as to be made of steel.

According to another embodiment of the present invention, a horizontal reinforcing plate in the longitudinal direction is provided on the web of the bracket end steel frame, and the horizontal reinforcing plate is installed inward from the upper end of the abutting portion so that the upper and lower surfaces thereof are flush with the upper and lower surfaces And the width of the horizontal reinforcing plate is longer than the length of the upper flange protruding from the web. In addition, the central steel frame can be configured such that the width of the upper flange is greater than the width of the upper flange of the bracket end steel frame so that the outer edges of the horizontal steel reinforcing plate and the central steel upper flange are aligned.

According to the present invention, the cross-sectional size of the steel girder is changed according to the magnitude of the stress acting on the beam structure, thereby reducing the amount of steel used, minimizing the number of workings on site, It has the versatility to be able.

Further, according to the present invention, it is possible to perform a jointing operation in a state where a central steel frame is mounted on a bracket end steel frame fixed to a pillar, thereby making it possible to secure the safety of the operator and the accuracy of construction.

In addition, the present invention can realize a slim floor by using the reinforcing means of the jointed portions, and also allows each of the reinforcing means to interact with each other organically so as to communicate the effect of reinforcement, And has a stable structure.

1 is a perspective view showing a cross-sectional structure of a girder according to the prior art.
2 is a cross-sectional view showing a cross-sectional structure of a girder according to another prior art.
3 is a perspective view of an example in which a steel girder is installed according to an embodiment of the present invention.
4 is a perspective view illustrating a state of the steel girder according to the first embodiment of the present invention.
5 is a modification of the first embodiment.
FIG. 6 is a perspective view showing a state in which a steel girder is separated and assembled according to a second embodiment of the present invention. FIG.
7 is a modification of the second embodiment.
8 is a cross-sectional view of a T-type composite girder constructed by the first and second embodiments.
9 is a perspective view of an example in which a fitting portion is formed in the bracket end section steel of the second embodiment.
10 is a perspective view and a plan view showing an example in which a deck mounting portion for a slim floor is formed on a bracket end frame in the second embodiment.
11 is a perspective view and a plan view showing an example in which a central steel frame is applied as a deformed iron ball in the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

3 is a perspective view showing an example in which a steel girder G according to an embodiment of the present invention is installed.

As shown in FIG. 3, the steel girder G according to the present invention is for constructing a beam structure of a building, and includes a bracket end steel frame 100 installed on a column C, And a central steel frame 200 positioned between the frame members. That is, both ends of the steel girder G are composed of the bracket end steel frame 100 and the steel frame girder G of the present invention is constituted by joining the central steel frame 200 to the bracket end steel frame 100.

The bracket end frame 100 has a cross-sectional dimension that can be matched to the vertical moment acting on the beam structure by being rigidly connected to the column C, and the center frame 200 can correspond to the longitudinal moment acting on the beam structure Sectional dimensions. Therefore, the central steel frame 200 has a smaller dancing than the bracket end steel frame 100.

Each of the bracket end steel frame 100 and the central steel frame 200 which are integrally joined to the column C as described above can be manufactured at a factory because the column C is installed in the field, So that the installation of the steel frame girder G can be completed simply by joining the bracket end steel frame 100 and the bracket steel frame 100 to the center steel frame 200 as a bracket for installing the central steel frame 200,

At both ends of the bracket end steel frame 100, joints 110 are formed at ends of the braces that are jointed to the center steel frame 200, in which the center steel frame 200 is placed. Therefore, since the end of the central steel frame 200 can be joined with the bracket end steel frame 100 in a state where the end portion of the central steel frame 200 is fixed to the mounting portion 110, It is possible to omit the suspension work of the central steel frame 200, which has the effect of improving workability as well as work stability.

The steel girder G of the present invention is embodied in various embodiments according to the configuration of the abovementioned mounting portion 110. [

4 and 5 illustrate a steel girder G according to a first embodiment of the present invention in which a mounting portion 110 provided in a bracket end portion steel frame 100 of the steel girder G includes a fitting portion 111 and the supporting portion 112 are orthogonal to each other so as to have a "B" shape.

The abutting portion 111 abuts on the web 202 at the end of the central steel frame 200 and is welded or bolted to the center steel frame 200 by bolting with a damper, Each of the webs 102 and 202 is integrated and the support portion 112 has the stability and the like as described above by placing the lower flange 203 at the end of the central steel frame 200.

The upper face of the upper flange 101 of the bracket end frame 100 and the upper face of the upper flange 201 of the central steel frame 200 are flush with each other by matching the length of the contact portion 111 with the dancing of the central steel frame 200 . In the case where the upper flanges 201 and 101 of the central steel frame 200 and the bracket end steel frame 100 coincide with each other, it is not necessary to insert a filler to overcome the step between the upper flanges 201 and 101, The sex becomes even better.

4, the contact portion 111 may be formed by cutting an end face of a portion of the web 102 constituting the bracket end portion steel 100, or may be formed by cutting the bracket end portion steel 100 A part of the web 102 to be constituted may be constituted by the side plates 111a provided perpendicularly to the end surface on which the web 102 is cut. As shown in FIG. 5, if the contact portion 111 is formed as the side contact plate 111a, the side contact plate 111a can be expected to have the same effect as that provided with the shear reinforcement of the steel frame girder G.

A horizontal reinforcing plate 120 in the longitudinal direction may be further provided on the web 102 of the bracket end frame 100. The horizontal reinforcing plate 120 can more reliably transfer the stress between the bracket end frame 100 and the central steel frame 200. The horizontal reinforcing plate 120 is preferably installed inward from the lower end of the fitting portion 111, The upper and lower surfaces of the plate 120 are flush with the upper and lower surfaces of the central steel lower flange 203.

The horizontal reinforcing plate 120 and the central steel frame lower flange 203 are formed to be flush with each other so that the horizontal reinforcing plate 120 is engaged with the lower flange 203 of the central steel frame 200 It is also possible to do bracket function for.

A vertical reinforcing plate 130 in the vertical direction may be further provided on the web 102 of the bracket end frame 100. The vertical reinforcement plate 130 functions to prevent the web 102 from shear buckling. The vertical reinforcement plate 130 is disposed to abut the inner end of the horizontal reinforcement plate 120, It is preferable that each function works efficiently by the effect.

Further, a stepped steel plate 140 may be further provided at an outer end of the support portion 112 of the bracket end steel frame 100. The end plate steel plate 140 prevents stress concentration due to a change in cross section between the bracket end steel plate 100 and the central steel plate 200.

The end plate steel plate 140 is installed vertically or sloped between the lower flange 103 of the bracket end frame 100 and the lower flange 203 of the central steel frame 200. When the end shell steel plate 140 is installed in the vertical direction, the vertical steel plate 230 in the vertical direction is also provided on the web 202 of the central steel frame 200, It is preferable that stress can be smoothly transmitted between the bracket end frame 100 and the central frame 200 by aligning the vertical frame 230 in a straight line.

6 and 7 show a steel girder G according to a second embodiment of the present invention.

The first embodiment, in which the abutting portion 111 and the supporting portion 112 are orthogonal to each other and has a "B" shape, has a ceiling having a higher central portion than both ends of the steel girder G, It can be very advantageously applied to an underground parking structure. In other words, the steel girder G of the first embodiment has both ends located in the parking space that does not require a high ceiling, and the central portion is located in a moving space requiring a higher ceiling than the parking space, do.

On the other hand, the steel girder G of the second embodiment maintains the lower surface of the steel girder G constantly, thereby protecting the outer appearance of the steel girder G and allowing the pipe to pass through the girder. In addition, the structural momentum increases the moment of inertia of the section where the midpoint moment is generated, so that the concrete and the steel work very efficiently, so that the section can be optimized.

The mounting portion 110 provided in the bracket end portion steel 100 in the second embodiment has the fitting portion 111 and the fitting upper portion 113 on the upper portion of the fitting portion 111 and the lower portion of the fitting portion 111 And a support portion 112 of the support portion 112. The support portion 112 has a "C" shape. Accordingly, the central steel frame 200 is inserted into the insertion groove formed by the 'C' shape, and is mounted on the support portion 112.

The fitting portion 113 includes a lower surface cut horizontally of a portion of the web 102 constituting the bracket end portion steel 100. The support portion 112, to which the end portion of the central steel frame 200 is fixed, And a lower bracket 112a attached to the lower flange 103 of the end frame 100.

The vertically abutting portion 111 between the fitting upper portion 113 and the supporting portion 112 is made to coincide with the dancing of the central steel frame 200 so that the bottom face of the lower flange 103 of the bracket end steel frame 100, So that the lower surface of the lower flange 203 of the body 200 has the same plane.

Therefore, when the T-shaped composite girder is constituted together with the slab concrete placed on the upper part of the steel girder G, the T-shaped composite girder in the central steel frame 200 is formed in the same manner as in the first embodiment By increasing the distance from the neutral axis N to the center of the section of the tensile steel section in comparison with the central steel section 200 of the central steel frame 200, the sectional moment of inertia is increased, It is possible to reduce the cost of the system. In addition, a through hole for the pipe may be formed in the portion of the upper concrete where the bending moment acts small.

 8A is a sectional view of the T-type synthetic girder according to the first embodiment, and FIG. 8B is a sectional view of the T-type synthetic girder according to the second embodiment.

The engaging portion 111 in the second embodiment may be constituted by an end face of which a part of the web 102 constituting the bracket end portion steel 100 is cut out as in the first embodiment, And the side plates 111a provided perpendicularly to the end surface of the web 102 constituting the web 102. [

The configurations of the horizontal reinforcing plate 120, the vertical reinforcing plate 130 and the end plate steel plate 140 of the first embodiment may be applied to the second embodiment as they are. The difference from the first embodiment is that only the end plate steel plate 140 of the second embodiment is installed between the upper flange 101 of the bracket end steel frame 100 and the upper flange 201 of the central steel frame 200 .

9, when the side plates 111a are formed as the cut end surfaces of the web 102, the bottom plate 112a is formed on the upper surface of the lower flange 103 of the bracket end section steel 100, And an upper plate 112b corresponding to the upper plate 112b. The fitting portion 112c is formed between the upper plate 112a and the lower plate 112a so that the lower flange 203 of the central steel frame 200 is inserted into the fitting portion 112c It is possible to prevent the conduction of the central steel frame 200 due to the carelessness of the operator during the mounting operation of the central steel frame 200, thereby enabling the stability and efficiency of the operation to be achieved.

FIG. 10 shows an example in which a slender floor is formed using a horizontal reinforcing plate 120 in the second embodiment.

The deck plate D installed on the upper part of the central steel frame 200 of the second embodiment is positioned in the overall dancing of the steel frame girder G so that a slim floor can be realized, The deck mounting portion 121 can be formed.

The deck mounting portion 121 is formed by increasing the width of the horizontal reinforcing plate 120 installed in the longitudinal direction of the web 102 of the bracket end portion frame 100. That is, the horizontal reinforcing plate 120 is installed inward from the upper end of the abutting portion 111 so that the upper and lower surfaces of the horizontal reinforcing plate 120 are flush with the upper and lower surfaces of the lower flange 203 of the central steel frame 200, The length of the upper flange 101 is larger than the length of the upper flange 101 protruding from the web 102,

The length of the deck plate D mounted on the steel frame girder G is uniformly equal to the length of the deck plate D mounted on the steel frame girder G by constituting the upper flange 201 of the cross- .

11 shows an example in which the outer end of the upper flange 201 of the central steel frame 200 is configured to coincide with the outer end of the horizontal reinforcing plate 120 on which the deck mounting portion 121 is formed, In this case, the central steel frame 200 is configured such that the width of the upper flange 201 is larger than the width of the upper flange 101 of the bracket end section steel 100.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

100; A bracket end steel frame 101, 201; Upper flange
102,202; Webs 103, 203; Bottom flange
110; A mounting part 111; Abutment portion
111a; Side plates 112; Support
112a; Bottom plate 112b; An upper plate
112c; Fitting portion 120; Horizontal reinforcement plate
121; A deck mounting part 130, 230; Vertical reinforcement plate
140; End plate 200; Central steel frame
C; Column D; Deck plate
G; Steel girder

Claims (12)

A steel girder for constructing a beam structure of a building,
And a central steel frame 200 positioned between the bracket end frames 100 and having a smaller dancing than the bracket end frame 100. The bracket end frame steel The end portion of the center steel frame 200 is connected to the mounting portion 110 and the end portion of the center steel frame 200 is connected to the mounting portion 110. [ Is joined to the bracket end section steel (100)
The mounting portion 110 includes a fitting portion 111 and a fitting portion 113 on the upper portion of the fitting portion 111 and a supporting portion 112 under the fitting portion 111 so as to have a " And the support portion 112 is formed by a lower flange of the bracket end portion steel frame 100. The lower end portion of the bracket end portion steel frame 100 is formed by cutting a portion of the web 102 constituting the bracket end portion steel frame 100, And the lower end of the lower flange 103 of the bracket end steel frame 100 is aligned with the lower end of the lower flange 103 of the center steel frame 200 by aligning the length of the contact portion 111 with the dancing of the central steel frame 200, And the bottom surface of the lower flange (203) of the steel frame (200) are formed in the same plane. delete delete delete delete delete delete  The steel material-saving H type steel girder according to claim 1, wherein the abutting portion (111) is formed by an end surface of a portion of the web (102) constituting the bracket end portion steel (100). The bracket according to claim 8, wherein the upper surface of the lower flange (103) of the bracket end frame (100) further comprises an upper plate (112b) corresponding to the lower plate (112a) Wherein a fitting portion (112c) into which the lower flange (203) of the central steel frame (200) can be inserted is formed. 2. The apparatus according to claim 1, wherein the abutting portion (111) comprises an abutting plate (111a) provided perpendicularly to an end surface of the bracket end frame (100) Steel type H type steel girder. The horizontal reinforcing plate (120) according to claim 1, wherein a longitudinal reinforcing plate (120) is provided on the web (102) of the bracket end frame steel (100) So that the upper and lower surfaces thereof are flush with the upper and lower surfaces of the central steel lower flange 203 and the width of the horizontal reinforcing plate 120 is longer than the length of the upper flange 101 protruding from the web 102 Steel type H-type steel girder. The steel material-saving H type steel girder according to claim 11, wherein the central steel frame (200) has a width of the upper flange (201) larger than a width of the upper flange (101) of the bracket end frame steel (100).

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