KR20120004049A - Site reinforcing method of thick wall with using plant welded steel bar frames - Google Patents
Site reinforcing method of thick wall with using plant welded steel bar frames Download PDFInfo
- Publication number
- KR20120004049A KR20120004049A KR1020100064699A KR20100064699A KR20120004049A KR 20120004049 A KR20120004049 A KR 20120004049A KR 1020100064699 A KR1020100064699 A KR 1020100064699A KR 20100064699 A KR20100064699 A KR 20100064699A KR 20120004049 A KR20120004049 A KR 20120004049A
- Authority
- KR
- South Korea
- Prior art keywords
- frame
- horizontal
- vertical
- reinforcement
- welding
- Prior art date
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
Abstract
Description
Reinforced concrete structure is the most widely used structural method in the world. The standard method is divided into the work of producing a container to hold the concrete, which is formed by the form woodworking, until it is cured as a solid with high strength, the reinforcing of the reinforcing steel and the pouring of the concrete. However, after the concrete is cured, the reinforcing bar cooperates with the tensile strength corresponding to the compressive strength of the concrete to create a new structure called "reinforced concrete." Have. In other words, the rebar and concrete formwork, a temporary material provided by woodworking, should serve as an incubator before concrete is cured. You have to hold on to it. Installations to resist the pressure of concrete are called clubbing and braces.
The pressure of the concrete on the formwork before the reinforced concrete is cured is 2.5 times the hydraulic pressure. Therefore, the formwork is a temporary material that should be removed after 4 weeks after the reinforcement of reinforced concrete is finished, but it is more important than reinforcement or concrete construction, requires more construction period, and costs more than reinforcement or concrete. However, formwork is one of the 3D sectors, so there are few domestic engineers, and the rebar works are the same. In order to overcome these difficulties, the precast concrete method, ie, the formwork, the reinforcement and the process of pouring concrete and curing, is carried out at the factory, and then assembled and put into the site. However, the members of the same standard are repeated, and it is mainly applied to special construction that does not have a large burden on transportation assembly and repair of joint defects.
In order to meet the seismic structure design standards such as the explosion-proof structure or nuclear power plant, the lap joint and anchorage length for securing the attachment strength of the thick reinforcing bar are greatly increased, resulting in the increase of rebar usage, and the vicious cycle of increasing the thickness of the wall continues. For example, if the 41 mm high strength reinforcing bar (F y = 500 MPa) and the concrete's compressive strength f ck = 30 MPa, the joint length is 2240 mm for the joint. In addition, such thick walls have a lot of rebars, so it is reasonable to use coarse rebars, but it is difficult to assemble on-site processing. I design it. Another reason is the heavy weight of the rebar, which is difficult to transport and assemble on site by manpower. For reference, 41mm diameter rebar has a weight of 10.5kg per unit length, so it is 84kg at 8m length and cannot be handled without the help of transport equipment. By convention, the radius of curvature to bend the rebar is three times the diameter up to 25 mm, but if it is 38 mm or more, it is five times the diameter. For example, 41 mm rebar takes up to 49.2 cm of width to bend 180 ° (see Fig. 5).
The reason for bending the end of the horizontal reinforcement in Figure 4 is to wrap the vertical reinforcement, but if the radius of curvature is large it is impossible to maintain the required position of the vertical rebar. In addition, the reduction of the construction period is directly related to the reduction of the project cost. Therefore, if the scale is large and air saving is absolutely necessary, such as in a nuclear power plant, rebar joints need to be manufactured by mechanical joints or welding, such as couplers instead of Lap Joints, to induce air savings. Of course, rebar welding, which is an absolute contraindication, must be manufactured by ordering the reinforcing bars with excellent weldability, and the necessary manufacturing regulations and specifications should be revised.
Omitting only the ridges and braces of the formwork from the reinforced concrete construction will greatly help the construction period and reduce the construction cost. When the reinforcing bars are separated by strands, they are easily bent due to their small stiffness.However, the method of reinforcing concrete, which was “form-dependent”, was reinforced using the principle that rigidity increases greatly when welding them together. It is desirable to change as much as possible. Although the reinforcing bar atomic symbol is "Fe" and is not different from other steel frame members such as H-beams, it is considered to be contraindicated to use reinforcing bars as a structural material (Standard Specification for Construction Work "3.2 Machining "Machining of rebars, rebars and welded nets is prohibited except for the special handling of the personnel in charge. This is because raw materials for rebar production are high in carbon, unlike regular steel materials such as H-beams. However, since most of the rebar processing is done at the construction site or the open air, it is considered difficult to manage, and therefore, welding and heating are prohibited as the standard specification of the Ministry of Land, Transport and Maritime Affairs. The above provisions, on the other hand, suggest that permitting the use of welded wire mesh while limiting the welding process does not forbid "welding" itself.
In the past, it was common practice to leave the reinforcing bars loaded on the site in order to easily cut the rebars, and cut the rebars in length using an oxygen welding machine. Cutting steel with oxygen can damage other steel bars below, but when partially heated steel is quenched in rainwater, local ductility and toughness are degraded. Therefore, the standard specification for building construction has added a clause that prohibits heating. In addition, the current reinforcing bar is not a circular bar, but the surface is curved and deformed, and steel structural engineers who regard precision as life do not want to recognize it as a raw material for steel structure.
Reinforcing bars are produced by melting scrap metal, and some new steel mills can produce them easily. Due to this effect, it is difficult to allow batch welding construction because bad steel is imported from China. Therefore, performance recognition and specification revision should be preceded to enable welding assembly at the factory, which has been applied as a standard construction technique for decades. In addition, in order to fabricate rebars in the factory, the performance recognition criteria of the used rebar, test and evaluation methods, and welding management must be specified. If these prerequisites are carried out, it may be sufficiently possible to weld the rebar at the factory. Gas welding is still allowed for field installation.
A system to certify the rebar welding of rebars after testing is established, and the standard for building construction is revised to allow rebar welding in the certified factory. Currently, some rebar manufacturing plants are ready to order production of welded rebars with carbon equivalents to improve weldability. In addition, in order to confirm the possibility of welding of the reinforcing bar, 13 types (26 pieces) of test specimens were manufactured and subjected to a tensile test, and the test results are attached as a reference. The test results showed that the yield strength and tensile strength were satisfactory, and the elongation was improved by heat treatment such as preheating and postheating.
Welding and reinforcing steel bars in a steel ball factory guarantees quality that is incomparable to tying them with binding lines at the construction site. In addition, thick steel can be used to increase the efficiency of the cross section, and the overall economic efficiency is secured by reducing the concrete cross section and reducing the amount of reinforcing bars due to no overlapping. Currently, the skilled workers mobilized for reinforced concrete construction in Korea are mostly foreign workers, causing social problems. However, assembling the reinforcing factories solved the problem of supply and demand for skilled workers, and it was confirmed that the construction period and construction cost were drastically reduced (20 ~ 30%).
The process of fabrication and installation for each part in the reinforcement of thick wall reinforcement frame after factory production is as follows.
1 and 3, the frame A (10) is assembled at both ends of the wall to be imported and installed on site after welding production in the factory. If the length of the wall is long, the
There are at least six vertical members 55 of frame A, of which a, b, c, and d are arranged outside the corners of four horizontal members arranged in well sperm shape, and the remaining two e, f are a and b, respectively. After installing the horizontal reinforcing bar to be fixed. If the height of the wall is a concern when the horizontal deformation during construction, the
Frame B (20) is a welded horizontal material and yarn only on one side vertical members c, d of the frame A, and serves as a support frame for reinforcing the horizontal reinforcement when the length of the wall is long. If the height of the wall exceeds the height of one floor of a general building, frame B is made of a quadrilateral plane, such as removing verticals e and f from frame A, instead of two verticals. When reinforcing bars in this way, frame A and frame B control the transverse deformation during construction, so unlike the conventional reinforced concrete construction, the amount of work of formwork woodworking to secure the vertical, horizontal and wall thickness of the formwork Will be reduced. In other words, if the assembly in the field after manufacturing the factory while maintaining the accuracy of the millimeter in the iron ball factory, it also functions as a formwork brace. The wall has a type and a T type in addition to the straight type, the T type can be constructed in the same way as the straight wall as shown in Figure 6 (b). When two walls meet at right angles to each other, such as a-type, frame C of FIG. 6 (a) is utilized.
Frame C (30) is made of at least seven vertical members 55. Six vertical members a, b, c, d, e, and f are manufactured as frame A, and the remaining g is fixed with horizontal rebar 3 between c. Do it. After reinforcing horizontal bars 1, 2 and 3, the vertical material h is placed on site, and the horizontal bar 4 is assembled to assemble the vertical bar. The horizontal and vertical spacing and thickness of horizontal material and the thickness of the material are transferred to the construction site and placed in a predetermined position, and the structural calculations are made to have sufficient strength until the concrete and pour concrete are laid by placing the horizontal and vertical bars. Decide
The vertical members 55, the
1 is a conceptual view of a reinforcing frame installed in the field by combining a factory-made frame A and frame B,
Figure 2 is a perspective view of the reinforcement frame and frame A installed in the field by combining the frame A and frame B,
3 is a work flow chart for each step,
4 is a case where the reinforcing bar after bending the thick reinforcing bar according to the current building standard,
5 shows the standard hook and bend radius for rebar diameter HD41,
6 is a method of reinforcement when the two walls meet in the form of a or T,
7 shows the tensile test results of the rebar welded portion.
<Code Description of Drawings>
10;
30; Frame C
40; Horizontal rebar 45; Vertical rebar
50; Horizontal members 55; vertical
60; Stock 62; nut
64; washer
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20100064699A KR101184511B1 (en) | 2010-07-06 | 2010-07-06 | Site Reinforcing Method of Thick Wall with Using Plant Welded Steel Bar Frames |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20100064699A KR101184511B1 (en) | 2010-07-06 | 2010-07-06 | Site Reinforcing Method of Thick Wall with Using Plant Welded Steel Bar Frames |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20120004049A true KR20120004049A (en) | 2012-01-12 |
KR101184511B1 KR101184511B1 (en) | 2012-09-19 |
Family
ID=45610742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR20100064699A KR101184511B1 (en) | 2010-07-06 | 2010-07-06 | Site Reinforcing Method of Thick Wall with Using Plant Welded Steel Bar Frames |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101184511B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230100984A (en) | 2021-12-29 | 2023-07-06 | 다스코 주식회사 | Prefabrication reinforcement structure of reinforced concrete wall-type structure construction wall |
KR20230144774A (en) | 2022-04-08 | 2023-10-17 | 다스코 주식회사 | L-shaped corner wall reinforcement pre-assembled reinforcement method of reinforced concrete wall structure building |
KR20230144775A (en) | 2022-04-08 | 2023-10-17 | 다스코 주식회사 | L-shaped corner inner wall of reinforced concrete wall structure building Reinforcement line assembly method |
KR20240038283A (en) | 2022-09-16 | 2024-03-25 | 다스코 주식회사 | Prefabricated reinforcement method of T-shaped Junction inner wall for reinforced concrete with structural wall system |
KR20240038280A (en) | 2022-09-16 | 2024-03-25 | 다스코 주식회사 | Prefabricated reinforcement method of T-shaped junction wall for reinforced concrete with structural wall system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58151209U (en) | 1982-04-03 | 1983-10-11 | フドウ建研株式会社 | Vertical waist joint muscle |
KR100812248B1 (en) | 2006-07-04 | 2008-03-10 | 박형국 | Prefabrication steel bar arrangement structure |
KR100875488B1 (en) | 2007-07-13 | 2008-12-22 | 김범준 | Non-support form system and construction method using the same |
-
2010
- 2010-07-06 KR KR20100064699A patent/KR101184511B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR101184511B1 (en) | 2012-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101381866B1 (en) | Pre-fabricated Steel Reinforced Concrete with steel angle | |
CN106906955B (en) | Shear wall integral prefabricated reinforcement mesh structure and construction method thereof | |
CN109707104B (en) | Concrete-filled steel tube casting body with tie bars and construction method | |
KR101184511B1 (en) | Site Reinforcing Method of Thick Wall with Using Plant Welded Steel Bar Frames | |
CN105888108A (en) | Reinforced concrete shear wall with positioning prefabricated member inside and construction method of reinforced concrete shear wall | |
CN104314095B (en) | A kind of shaped steel buttress for the construction of super thick raft plate and valve plate and construction method | |
CN105952061B (en) | Precast shear wall steel reinforcement cage component, column steel reinforcement cage component and manufacture assembly method | |
CN106032692A (en) | Integral pouring molding construction method for reinforced concrete column | |
KR100731593B1 (en) | A pre-fabricating forms for concrete-structure and the construction method thereof | |
CN105256948A (en) | Construction method and molding bed of square reinforced concrete pier | |
CN105952060A (en) | Precast beam reinforcement cage component and assembling method thereof | |
CN104831818A (en) | Connection node of precast reinforced concrete beam and laminated column | |
CN104175398B (en) | Make the mold and method of prefabricated case beam framework of steel reinforcement | |
CN101793075A (en) | Semi-precast beam | |
CN204001652U (en) | The portable exterior wall operating platform of fabricated shear wall structure | |
KR20120058696A (en) | On-site Joint of the Prefabricated Re-bar Column to Re-bar Girders | |
CN103194982B (en) | Construction method for short cantilever support at bridge side span cast-in-situ segment | |
CN207793884U (en) | The steel frame construction of Sarasota upper king-post strut | |
CN104060763A (en) | Z-shaped steel pipe-steel framework recycled concrete combined pillar | |
CN207073117U (en) | Factory's formula large-sized aqueduct construction system | |
CN203640257U (en) | Support of overhanging type scaffold | |
CN206600005U (en) | The positioning component and positioner of reserved joint bar in shear wall | |
CN211473348U (en) | Scaffold wall connecting piece | |
CN112523503B (en) | Disassembly-free supporting system for concrete box girder inner mold and construction method | |
CN202181728U (en) | Foundation reinforcing bar non-connector construction structure for shear wall and attached-wall column |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
FPAY | Annual fee payment |
Payment date: 20150910 Year of fee payment: 4 |
|
FPAY | Annual fee payment |
Payment date: 20161010 Year of fee payment: 5 |
|
LAPS | Lapse due to unpaid annual fee |