Column head protection structure
By using cement columns fixed between the formwork and the steel bars as the column head protection structure during the concrete pouring process, the problems of steel bars inclination and rust are solved, and the integrity of the steel bar protective layer and structural strength are improved.
Patent Information
- Application Number
- CN202421527160.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-01
AI Technical Summary
During the concrete pouring process, the steel bars are prone to inclination due to the impact, resulting in loss of the protective layer, which in turn leads to corrosion and reduced strength of the steel bars. The prior art uses rebar as a stigma protective structure, but rebar itself may also rust, causing other rebars to rust.
Cement columns fixed between the formwork and the steel bars are used as the column protection structure. The cement columns are fixed to the steel bars through iron wire to prevent the steel bars from tilting, and cement columns are formed using concrete during pouring to avoid the use of additional materials.
Effectively prevent the steel bars from tilting during the pouring process, keep the steel bar protective layer intact, avoid steel bar corrosion, and improve the strength and durability of the reinforced concrete structure.
Smart Images
Figure CN222949323U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of building decoration, in particular to a column head protection structure for ensuring a steel bar protection layer of a reinforced concrete beam, column, wall and the like. Background Art
[0002] The main component of steel bars is iron, which is easy to oxidize at room temperature, especially in high temperature or humid environment. Steel bars are wrapped in concrete components to form a passivation protective film, which is relatively safe if they do not contact the outside world. Therefore, in the process of pouring reinforced concrete beams, columns, walls, etc., a protective layer should be set for the steel bars. However, if the thickness of the steel bar protective layer is too small, on the one hand, it is easy to cause the steel bars to be exposed or the surface concrete to peel off when the steel bars are stressed. On the other hand, as time goes by, the surface concrete will be carbonized, and the outer protective layer of the steel bars will lose its function, resulting in steel bar corrosion, reduced cross-section, reduced strength, loss of adhesion between the steel bars and concrete, and the components will be damaged. In practice, the thickness of the steel bar protective layer refers to the distance from the outer edge of the stressed steel bar to the concrete surface. The net protective layer thickness refers to the thickness from the outer edge of the main bar to the edge of the concrete component. The thickness of the steel bar protective layer is for the stressed bars, while the net protective layer thickness is for the outermost steel bars, depending on which steel bars are outside. For example: For a reinforced concrete column, the protective layer is 30mm, which is relative to the column longitudinal bars; its net protective layer is 15mm, which is relative to the column stirrups. The thickness of the concrete cover refers to the distance from the outer edge of the outermost steel bars (hoops, structural bars, distributed steel bars, etc.) in the concrete structural member to the concrete surface.
[0003] When pouring concrete, whether it is a concrete beam, a concrete column or a wall, due to the strong impact of concrete, it is easy to tilt the steel bars (hoops, structural bars, distribution bars, etc.) in the middle of the formwork against the formwork, and lose the steel bar protection layer. Therefore, measures need to be taken to prevent the steel bars from tilting during the casting process. At present, a very effective measure is to set a group of threaded steel bars with a diameter equal to the thickness of the steel bar protection layer on both sides of the steel bar as a column head protection structure. In this way, due to the obstruction of these column head protection structures (threaded steel bars), the steel bars are prevented from tilting toward the formwork. However, since the threaded steel bar itself is also made of iron, it may be exposed to the air or the thickness from its outer edge to the edge of the concrete component is less than the thickness of the steel bar protection layer. In this way, these threaded steel bars will also rust. Since this threaded steel bar is close to the steel bars of reinforced concrete beams, columns, walls, etc., if it rusts, it will also cause other steel bars to rust, reducing the strength of reinforced concrete. Utility Model Content
[0004] Based on the deficiencies brought about by currently using a threaded steel bar as a column capital protection structure, the utility model provides a column capital protection structure, in which a cement column fixed between a template and the steel bar blocks the steel bar from tilting, thus overcoming the deficiencies brought about by currently using a thick steel bar to block the steel bar from tilting.
[0005] The technical solution adopted by the utility model to achieve its technical purpose is: a column head protection structure is arranged between the template and the bundled steel bars when pouring concrete; it includes a cement column prepared from concrete used during pouring and arranged between the template and the steel bars, and a fixing device for fixing the cement column to the steel bars.
[0006] Furthermore, in the above-mentioned column head protection structure: the cement column is a cylindrical cement column, and the fixing device includes an iron wire axially arranged in the cylindrical cement column.
[0007] Furthermore, in the above-mentioned column head protection structure: the iron wire is arranged at the eccentric center of the cylindrical cement column, close to one side of the steel bar.
[0008] Furthermore, in the above-mentioned column capital protection structure: the cement column is a polygonal cement column, and the fixing device includes an iron wire axially arranged in the polygonal cement column.
[0009] Furthermore, in the above-mentioned column capital protection structure: the cross-section of the polygonal cement column is an equilateral triangle, one side of which is against the bundled steel bars, and the iron wire is arranged on the side close to the steel bars.
[0010] Furthermore, in the above-mentioned column capital protection structure: the cross-section of the polygonal cement column is an equilateral triangle, one side of which is close to the formwork, and the iron wire is arranged near a corner of the steel bar.
[0011] When the column head protection structure of the utility model is installed between the template and the bundled steel bars, it can prevent the steel bars from tilting toward the template when subjected to the impact force of the trap.
[0012] The present invention is further described below in conjunction with the accompanying drawings and specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Attached Figure 1 This is a schematic diagram of the column head protection structure of Example 1 of the utility model;
[0014] Attached Figure 2 This is a schematic diagram of the installation of Embodiment 1 of the utility model;
[0015] Attached Figure 3 This is a cross-sectional view (1) of Embodiment 1 of the present utility model;
[0016] Attached Figure 4 This is a cross-sectional view (2) of Embodiment 1 of the present utility model;
[0017] Attached Figure 5 This is a cross-sectional view (3) of Embodiment 1 of the present utility model;
[0018] Attached Figure 6This is a cross-sectional view (1) of Embodiment 2 of the present utility model;
[0019] Attached Figure 7 This is a cross-sectional view (2) of Example 1 of the utility model. DETAILED DESCRIPTION
[0020] This embodiment is a method for protecting the steel bars 110 that have been bundled in the template 100 when pouring reinforced concrete columns or reinforced concrete walls, so as to prevent the steel bars 110 from tilting against the template 100, which may cause the steel bars 110 to be exposed to the air after pouring, lose the passivation protective film and rust. This embodiment provides a column head protection structure 120, such as Figure 2 shown.
[0021] The column head protection structure in this embodiment is as follows Figure 1 As shown, it mainly consists of two parts, a cement column 121 and a fixing device 122 for fixing the cement column 121 to the bundled steel bars 110. In fact, the cement column 121 is a column made of concrete that has been mixed when casting reinforced concrete columns or reinforced concrete walls. In practice, according to needs, after these cement columns are tied to the steel bars 110, since the same concrete is used for re-casting, it will not cause the strength of the wall or reinforced concrete column to change after solidification. In fact, the cement column 121 used can be cylindrical, and its diameter is greater than the thickness of the steel bar protective layer, if the gap between the bundled steel bars 110 and the template 100 is large enough, the shape of the cement column 121 is set according to needs, and generally a cylinder is used, such as Figure 1 , 3 As shown in Figures 4 and 5, such a cylinder is inserted between the template 100 and the bundled steel bars 110, and its obstruction prevents the steel bars 110 from tilting.
[0022] The fixing device 122 is used to fix the cement column 110 to the bundled steel bars 110 to prevent it from being knocked down by the impact force of the concrete body during pouring. Generally, an iron wire 122-1 is used. In fact, when producing the cement column 121, such an iron wire 122-1 (actually also a steel bar, generally a threaded steel bar) is poured into the middle of the cement column 121. If the gap between the bundled steel bars 110 and the formwork 100 is large enough, and the radius of the cement column 121 is larger than the thickness of the steel bar protective layer, the iron wire can be poured in the center of the cement column 121, and a section is reserved at both ends of the cement column to be tied to the bundled steel bars 110. If the gap between the bundled steel bars 110 and the formwork 100 is not large, the iron wire can be poured off-center in the cement column 121. When in use, it is tied to the bundled steel bars 110 close to the section. Figure 4In practice, the wire can also be set into two strands, both ends of which are cast into the cement column, and the middle is exposed from the top of the cement column 121 and hung on the bundled steel bars 110, as shown in FIG. Figure 5 shown.
[0023] In practice, the cement column 121 may be in other shapes, such as a prism, a triangular prism, a quadrangular prism, a pentagonal prism or even a hexagonal prism. Figure 6 and Figure 7 The schematic diagram of the cement column is a triangular prism with a regular triangle cross section. The iron wire 122-1 as a fixing device can actually be installed in the center of the cross section. Figure 6 and Figure 7 As shown, the iron wire 122-1 is arranged on the edge of the cement column 121, such as near one edge. During pouring, the side of the cement column 121 with the iron wire 122-1 (actually a threaded steel bar) is close to the bundled steel bars 110, and its diagonal side is close to the template. Figure 6 The wire 122-1 may also be arranged at a corner, such as Figure 7 As shown, this corner is close to the bundled steel bars 110. In fact, the iron wire used for the fixing device 120 can also be a part of the bundled steel bars. In this way, it can not only prevent the bundled steel bars 110 from tilting, but also does not need to increase materials, and the original steel bars can be directly used.
Claims
1. A column head protection structure, arranged between a formwork (100) and bundled steel bars (110) during concrete pouring; characterized in that: The invention comprises a cement column (121) made of concrete used for pouring and arranged between a formwork (100) and a steel bar (110), and a fixing device (122) for fixing the cement column (121) to the steel bar (110).
2. The column head protection structure according to claim 1, characterized in that: The cement column (121) is a cylindrical cement column, and the fixing device (122) comprises an iron wire (122-1) axially arranged in the cylindrical cement column.
3. The column head protection structure according to claim 2, characterized in that: The iron wire is arranged at the eccentric center of the cylindrical cement column, close to one side of the steel bar (110).
4. The column head protection structure according to claim 1, characterized in that: The cement column (121) is a polygonal prism-shaped cement column, and the fixing device (122) comprises an iron wire axially arranged in the polygonal prism-shaped cement column.
5. The column head protection structure according to claim 4, characterized in that: The cross section of the polygonal cement column is an equilateral triangle, one side of which is against the bundled steel bars (110), and the iron wire (122-1) is arranged on the side close to the steel bars.
6. The column head protection structure according to claim 4, characterized in that: The cross section of the polygonal cement column is an equilateral triangle, one side of which is close to the formwork (100), and the iron wire (122-1) is arranged near a corner of the steel bar.