KR20170057063A - Punching share stiffening member of separation type and strength enhancement manufacturing method of foundation slab using of the same - Google Patents
Punching share stiffening member of separation type and strength enhancement manufacturing method of foundation slab using of the same Download PDFInfo
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- KR20170057063A KR20170057063A KR1020150160679A KR20150160679A KR20170057063A KR 20170057063 A KR20170057063 A KR 20170057063A KR 1020150160679 A KR1020150160679 A KR 1020150160679A KR 20150160679 A KR20150160679 A KR 20150160679A KR 20170057063 A KR20170057063 A KR 20170057063A
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- Prior art keywords
- punching shear
- stiffener
- punching
- column
- foundation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/08—Reinforcements for flat foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
The present invention relates to a method of increasing the strength of a base plate for suppressing the occurrence of punching transfer cracks in a base plate on which a concentrated load acts, and more particularly, The present invention also relates to a method of increasing the strength of a foundation plate using the same, and a method of reinforcing a foundation plate using the same.
According to the concrete structure design standard, the placement of reinforcing materials using reinforcing bars or steel wires is allowed to prevent punching shear failure, which shows brittle behavior due to concentrated loads or reaction forces in slabs or foundation plates. There are closed stubs in the form of typical stiffeners, and single, multi-legs and lattice bars are suggested. However, there is a disadvantage in that it is difficult to fix the stirrup-type shear reinforcement in a slab having a thickness of 250 mm or less, and that it is somewhat complicated to arrange the flexural reinforcement disposed at the upper and lower portions of the slab.
Also, a shear head is known as a shear stiffener welded after cutting and bending so that a grid can be formed around a column using an I-beam or a b-beam. However, when the slab is used for slabs, the height of the section steel must also be lowered. Therefore, it is necessary to manufacture the steel slabs separately from the steel slabs.
Shear studs are also known as rod-like shear stiffeners with enlarged heads to improve mechanical fixation forces at both ends. This is known to be more effective for punching shear when radially arranged around the column, and then developed as a shear stud rail welded on one end of the shear stud to the steel strip, have. However, there is a limit in which the diameter of the stud head and the spacing of the shear stud are specifically defined in order to secure a proper fixing force.
As a background of the present invention, Korean Registered Patent No. 10-1188008, "Shear Stiffener of Reinforced Concrete Flat Plate Slab" is presented. A base; A support frame extending upward from the base to form an open space on the base; An outer frame extending laterally from the support frame is integrally formed, and the support frame extends upwardly from the base in an inclined manner.
However, the background art is not located on the crack line generated in the oblique direction to the slab generated due to the concentrated load of the column but horizontally arranged, it can not prevent the occurrence of the crack extending in the diagonal line around the lower portion of the column, It is not a structure that can be done, so we can not expect to increase the history.
The present invention relates to a separable stand-alone punching shear stiffener which can increase the strength and reduce the thickness of the foundation plate to prevent brittle punching shear failure of the foundation foundation plate, And an object of the present invention is to provide a method of increasing the strength.
According to a preferred embodiment of the present invention,
A step in which a column bottom steel rod is laid at a position where a foundation lower steel bar and a foundation upper steel bar are laid out at a base plate or a slab position to be installed and at the same time a column is to be installed on the foundation plate;
A punching shear stiffener having a predetermined number of punching shear stiffeners disposed in the vicinity of the lowermost end face of the column of the casting steels in such a manner as to correspond to the shape of the column section, A step of disposing and fixing directly below the upper reinforcing bars;
The concrete is filled in the inner and outer portions of the punching shear reinforcement so that the concrete is laid in the reinforced steel bars so that the punching transfer crack is intercepted and the three-dimensional concrete is compressed;
The punching shear stiffener is a conical shape having a constant height made of a steel plate having a certain thickness and has a small diameter small pore hole at one end and a relatively large pore hole at the other end and a pore hole in the small pore hole. And a skirt portion for forming a concrete filling room opened toward the outside.
The punching shear stiffener may be provided in a number corresponding to four sides of the minimum pillar when the pillar has a rectangular cross-section, and may have a hole formed by welding or joining to the upper upper reinforcing bar or a hole formed in the punching shear reinforcement, And is fixedly installed.
The punching shear stiffeners are circularly arranged at a minimum spacing of 4 or more within a maximum mutual tangent range around the column when the columns have a circular cross section and are welded to the upper upper reinforcing bars or formed in a hole formed in the punching shear stiffener And the base upper reinforcing bars are fixedly installed by binding with a wire.
Further, the punching shear stiffener is supported and joined to the circular support ring of the stiffener support mechanism provided on the base plate.
On the other hand, in the punching shear stiffener for increasing the strength of the base plate,
It is a conical shape with a certain height made of a steel plate with a certain thickness. It has a small diameter small pore at one end and a relatively large diameter pore hole at the other end. The pore is filled in the inside. Concrete And a skirt portion for forming a filling chamber.
The punching shear reinforcement may further include a circular support ring connected to the upper ends of the plurality of ring legs and ring legs and joined to the outer surface of the skirt portion.
According to the present invention, the punching shear stiffener is placed under the top surface of the foundation plate in contact with the column with the large diameter portion facing upward and the small diameter portion facing downward. By installing the punching shear stiffener, Effect is generated, and reinforcement is made by increasing the strength of the base plate.
Also, there is an effect that the punching shear strength of the base plate is improved and the failure mode is brittle and the punching shear fracture at the ultimate load is prevented, so that the ductility behavior can be induced.
In addition, since the thickness of the base plate can be reduced, it is possible to reduce the ter- mination amount and the amount of concrete pouring, thereby reducing the cost of the ter- minator and reducing the overall air cost.
In addition, reinforcing stirrups, shearheads, and enlarged head shear studs can be omitted, and manufacturing cost and cost can be improved by constructing and installing a low cost unit.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIGS. 1A to 1C are views showing a manufacturing process of a foundation plate according to an embodiment of the present invention for increasing the strength of a foundation plate using a separate, independent punching shear stiffener.
Fig. 2 is an arrangement view of a punching shear stiffener viewed from a plane in Fig. 1b. Fig.
FIG. 3A is a perspective view of a punching shear stiffener applied to the present invention. FIG.
FIG. 3B is a front sectional view of FIG. 3A. FIG.
FIG. 4 is a corresponding state diagram of a punching shear stiffener according to an inner cracking angle of a foundation plate according to the arrangement method of the present invention. FIG.
FIG. 5A is a view illustrating a state in which the punching shear stiffener and the stiffener support mechanism according to the present invention are engaged with each other. FIG.
Fig. 5B is an installation state of a punching shear stiffener in a state in which the stiffener receiving mechanism of Fig. 5A is applied. Fig.
FIG. 6 is a load-displacement diagram of the foundation plate shown in FIG. 1C. FIG.
7A and 7B are a front view and a plan view schematically showing another method of installing the punching shear stiffener.
7B is a load-displacement diagram showing the amount of displacement of the foundation plate when a concentrated load is applied to the column in the installation method of FIG. 7A.
Figs. 8A and 8B are a front view and a plan view schematically showing another mounting method of the punching shear stiffener. Fig.
8B is a load-displacement diagram showing the amount of displacement of the foundation plate when a concentrated load is applied to the column in the installation method of FIG. 8A.
9 (a) and 9 (b) are various arrangements of punching shear stiffeners in the case of a circular column.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.
The method of increasing the strength of the foundation plate using the separable stand-alone punching shear stiffener according to the present invention will be described.
<Installation of base plate reinforcement>
The foundation lower reinforcing
The base
<Placement and Fixation of Punching Shear Stiffener>
Next, as shown in FIGS. 1B and 2, a suitable number of punching
3A and 3B, the punching
The thickness of the punching
The
The minimum angle of the side inclination angle [theta] is determined by having the punching
At this time, the punching
When the punching
2, four punching
As another method of installing the punching
As another method of installing the punching
Here, the
<Concrete filling in punching shear reinforcement>
Then, concrete is poured into reinforcing
The
That is, when the punching
In order to determine the optimum arrangement position and direction of the punching
Here, the term "MSP " shown in each of the load-displacement diagrams shown in Figs. 6, 7B and 8B is an abbreviation of" Multiple Shear Preventer ", which designates "punching
First, when the punching
8 (a) and 8 (b), when the punching
However, as in the preferred embodiment of the present invention, the punching
When the installation direction and the arrangement direction of the punching
In addition, the reinforcement can be made by the construction according to the optimal installation direction and the installation position of the punching
9, the punching
9 (A) shows that four punching
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.
10: Base plate
12: foundation bottom reinforcing bar
14:
16: Pillar Cast Iron
20: Punching Shear Stiffener
21: filling small hole
22: Filling hole
24: Skirt portion
30: Stiffener support mechanism
32: Circular support ring
Claims (6)
A suitable number of punching shear stiffeners 20 are disposed in correspondence with the shape of the end face of the column 18 around the lowermost side end face of the column casting reinforcement 16 so that a portion having a large diameter is moved upward (18) and disposed under and directly underneath the base upper reinforcing bars (14);
The concrete is filled in the inner and outer portions of the punching shear reinforcement 20 so that the concrete is laid and cured in the reinforced reinforcing bars 12, 14 and 16 so that the three-dimensional concrete is compressed simultaneously with the interruption of the punching transfer cracks;
The punching shear stiffener 20 is a conical shape having a constant height made of a steel plate having a predetermined thickness and is provided with a filling hole 21 having a small diameter at one end and a filling hole 22 having a relatively large diameter at the other end, And a skirt portion (24) for forming a concrete filling chamber (23) opened toward the filling hole (22) from the filling small hole (21) is provided in the base plate How to increase the strength.
The punching shear stiffener 20 is installed in a number corresponding to the four sides of the minimum pillar 18 when the pillar 18 has a rectangular cross section and is welded to the base upper reinforcing bar 14 Wherein a hole (24a) formed in the punching shear reinforcement (20) and a base upper reinforcing bar (14) are fixedly connected by a wire.
The punching shear stiffener 20 is circularly arranged at a minimum spacing of 4 or more within a maximum mutual tangent of the pillars 18 when the pillars 18 have a circular cross section, And the hole 24a formed in the punching shear stiffener 20 and the base upper reinforcing bar 14 are fixedly connected by a wire and fixed.
Wherein the punching shear stiffener is supported and joined to the circular support ring of the stiffener support mechanism provided on the foundation plate. .
(21) having a small diameter at one end, a filler hole (22) having a relatively large diameter at the other end, and a filler hole And a skirt portion (24) for forming a concrete filling chamber (23) opened toward the filling hole (22).
And a circular support ring (32) connected to an upper end of the ring leg (31) and joined to an outer surface of the skirt section (24). The separating stand - alone punching shear stiffener .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150160679A KR101750176B1 (en) | 2015-11-16 | 2015-11-16 | Punching share stiffening member of separation type and strength enhancement manufacturing method of foundation slab using of the same |
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KR1020150160679A KR101750176B1 (en) | 2015-11-16 | 2015-11-16 | Punching share stiffening member of separation type and strength enhancement manufacturing method of foundation slab using of the same |
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KR20170057063A true KR20170057063A (en) | 2017-05-24 |
KR101750176B1 KR101750176B1 (en) | 2017-06-22 |
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KR1020150160679A KR101750176B1 (en) | 2015-11-16 | 2015-11-16 | Punching share stiffening member of separation type and strength enhancement manufacturing method of foundation slab using of the same |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112632665A (en) * | 2020-12-18 | 2021-04-09 | 中国二十冶集团有限公司 | BIM modeling method for special-shaped upper cup opening of equipment foundation |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102654273B1 (en) | 2023-05-16 | 2024-04-03 | (주)렉스코 | Steel composite precast piers with shear reinforcement bars connected to steel columns and construction method of the same |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101247201B1 (en) * | 2012-09-05 | 2013-03-25 | 신세계건설(주) | Reinforcement member for preventing punching shear and construction method using the same |
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2015
- 2015-11-16 KR KR1020150160679A patent/KR101750176B1/en active IP Right Grant
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112632665A (en) * | 2020-12-18 | 2021-04-09 | 中国二十冶集团有限公司 | BIM modeling method for special-shaped upper cup opening of equipment foundation |
CN112632665B (en) * | 2020-12-18 | 2023-03-14 | 中国二十冶集团有限公司 | BIM modeling method for special-shaped upper cup opening of equipment foundation |
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KR101750176B1 (en) | 2017-06-22 |
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