Anti-seepage high-strength concrete column
By combining the combined design of ECC matrix and FRP straight and spiral ribs in the concrete column, the problem of degradation of durability and strength of reinforced concrete columns in special environments is solved, and efficient anti-seepage performance and construction quality assurance is achieved.
Patent Information
- Application Number
- CN202421767169.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The existing reinforced concrete columns have reduced durability and strength due to cracks in underground tunnels, dams, marine engineering and other environments, especially in brine environments and high temperature and high humidity environments.
The concrete column and ECC matrix are arranged from the inside to the outside, with FRP straight ribs and FRP spiral ribs inside, and the overall strength and anti-seepage performance of the concrete column are enhanced by a combination of end caps, anchor blocks and anchor nuts.
It improves the durability and seismic resistance of concrete columns, enhances the anti-seepage performance, simplifies the construction process, improves the construction efficiency, and is suitable for reinforced concrete column design in special environments.
Smart Images
Figure CN223075035U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of construction engineering, and particularly relates to a seepage-proof high-strength concrete column. Background Art
[0002] As a common load-bearing member in building structures, reinforced concrete columns usually serve as vertical support members in residential, commercial, and industrial buildings. Especially in bridge engineering, as components of piers or abutments, they can bear large axial loads and ensure the stability and safety of the structure. With the continuous development and improvement of building structures, the strength requirements for reinforced concrete columns are also increasing. The strength of reinforced concrete columns is usually achieved by increasing the amount of steel bars, using high-strength concrete, optimizing the cross-sectional shape, etc. However, cracks are inevitably generated during the casting process or service life of concrete components. The cracks will expose the internal voids of the concrete components to the external environment, making them vulnerable to erosion by factors such as climate, chemical substances, and salt corrosion, thus reducing their durability. Especially in special environments such as saline water environments, high-temperature and high-humidity environments, or chemical plants, cracks will accelerate the corrosion and damage of concrete components. In some special engineering projects, higher requirements are put forward for the seepage-proof performance of concrete columns. For example, in environments such as underground tunnels, dams, and ocean engineering, concrete columns need to bear large water pressures and environmental erosion, so higher requirements are put forward for their seepage-proof performance and strength.
[0003] Therefore, the existing reinforced concrete columns are affected by cracks in environments such as underground tunnels, dams, and ocean engineering, resulting in a decline in their durability and strength. Summary of the Utility Model
[0004] Aiming at the technical problems existing in the prior art, the purpose of the utility model is to provide a seepage-proof high-strength concrete column to solve the problem that the existing reinforced concrete columns are affected by cracks in environments such as underground tunnels, dams, and ocean engineering, resulting in a decline in their durability and strength.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A seepage-proof high-strength concrete column includes a concrete column and an ECC matrix arranged in sequence from inside to outside, and FRP straight bars and FRP spiral bars are arranged in the ECC matrix.
[0007] As a preference, the ECC matrix is a tubular structure, and the FRP spiral bar is located at the midline of the tube wall of the ECC matrix.
[0008] As a preference, it further includes end caps. The number of end caps is two, and the two end caps are respectively connected to both ends of the ECC matrix.
[0009] As a preference, the end cap is provided with an anchoring hole. The FRP straight bars extend from the ECC matrix to the outside. The part of the FRP straight bars outside the ECC matrix passes through the anchoring hole. An anchoring block is inlaid at the anchoring hole. The anchoring hole and the anchoring block cooperate to anchor the FRP straight bars.
[0010] As a preference, the number of the anchoring blocks is three. The three anchoring blocks are combined to form a frustum of a cone structure with a through hole. The frustum of a cone structure is sleeved on the outer surface of the FRP straight bars through the through hole, and the frustum of a cone structure is inlaid into the anchoring hole.
[0011] As a preference, an anchoring nut is further included. The anchoring hole is provided with an internal thread, and the anchoring nut is provided with an external thread. The anchoring nut and the anchoring hole are matched through the external thread and the internal thread. The anchoring nut is used for pressing the frustum of a cone structure in the anchoring hole.
[0012] As a preference, the contact surface between the end cap and the ECC matrix is provided with a protrusion.
[0013] As a preference, the number of the FRP straight bars is multiple. Among them, the multiple FRP straight bars respectively enclose a first FRP straight bar layer and a second FRP straight bar layer. The first FRP straight bar layer and the second FRP straight bar layer are located on both sides of the FRP spiral bars.
[0014] As a preference, longitudinal steel bars are arranged in the concrete column.
[0015] As a preference, the side wall of the concrete column is provided with circumferential steel bars.
[0016] Generally speaking, the utility model has the following advantages:
[0017] 1. The anti-seepage high-strength concrete column of the utility model enhances the overall strength and anti-seepage performance of the concrete column through the combined design of FRP spiral bars, FRP straight bars and ECC matrix, and improves the durability and seismic performance of the concrete column.
[0018] 2. The anti-seepage high-strength concrete column of the utility model adopts a combined precast column sleeve of FRP spiral bars, FRP straight bars and ECC matrix. Taking the precast column sleeve as a column formwork can improve the engineering construction efficiency, reduce the on-site construction time, and at the same time help to ensure the construction quality. The design of the precast column sleeve can also simplify the construction process and reduce the construction difficulty.
[0019] 3. The pre-tension anchoring of the FRP straight bars in the utility model adopts an adjustable form. During the service process of the component, the micro-cracks of the ECC matrix in the precast column sleeve can also be repaired by increasing the longitudinal tension. It provides a new idea for the design of reinforced concrete columns in special environments and meets the strategic goal of the sustainable development of the construction industry. Description of the Drawings
[0020] Figure 1Schematic diagram of a seepage-proof high-strength concrete column.
[0021] Figure 2 Top view of a seepage-proof high-strength concrete column.
[0022] Figure 3 Schematic diagram of FRP straight bar anchorage of a seepage-proof high-strength concrete column.
[0023] Figure 4 Cross-sectional view of a precast column casing.
[0024] Figure 5 Top view of an end cap.
[0025] Figure 6 Bottom view of an end cap.
[0026] Figure 7 Stereogram of an anchorage block and an anchorage nut.
[0027] Among them, 1. ECC matrix; 11. Reserved hole; 2. End cap; 21. Anchorage hole; 22. Internal thread; 23. Protrusion; 3. FRP straight bar; 4. FRP spiral bar; 5. Anchorage block; 51. Friction cross striation; 6. Anchorage nut; 61. Convex block; 62. External thread; 7. Concrete column; 8. Longitudinal reinforcement; 9. Circumferential reinforcement; Specific implementation mode
[0028] The present invention will be further described in detail below in conjunction with specific implementation modes.
[0029] Please refer to Figure 1-7 , a seepage-proof high-strength concrete column provided in this embodiment includes: a precast column casing and a core wrapping area (formed by a concrete column and corresponding steel bars). The precast column casing includes an end cap, an ECC matrix, an FRP spiral bar, a plastic pipe, an FRP straight bar, an anchorage block and an anchorage nut; the core wrapping area (formed by a concrete column and corresponding steel bars) is configured with longitudinal reinforcement and circumferential reinforcement, and concrete is poured to form, that is, a concrete column and an ECC matrix are arranged in sequence from inside to outside.
[0030] Among them, an FRP spiral bar is embedded in the ECC matrix to form the middle section of the precast column casing. End caps made of steel plates are arranged at both ends of the ECC matrix. Reserved holes are provided in the height direction of the ECC matrix. FRP straight bars pass through both ends of the reserved holes, and a pre-tension force is applied. The two ends of the FRP straight bars are anchored to the end caps through the anchorage block and the anchorage nut; the precast column casing can be used as a formwork for pouring the concrete column. Longitudinal reinforcement and circumferential reinforcement are arranged in the holes in the middle of the ECC matrix, and concrete is poured to form a core wrapping area (formed by a concrete column and corresponding steel bars).
[0031] Please refer to Figure 1-4, the middle section of the precast column casing is made by combining FRP spiral bars with the ECC matrix. The FRP spiral bars are located at the midline of the precast column casing wall. Before pouring the ECC material, a plastic pipe is installed and fixed to ensure that a tubular ECC matrix is formed after the ECC material solidifies. Reserved holes are set in the ECC matrix, and the hole size can be adjusted according to the thickness of the column wall. The number of reserved holes is 20. Every 10 reserved holes are circularly distributed on the ECC matrix. The circle formed by 10 reserved holes is used as the installation layer for the FRP straight bars. One FRP straight bar is inserted into each reserved hole, that is, 20 reserved holes form two installation layers on the ECC matrix. The two installation layers are symmetric on both sides of the FRP spiral bars. The number of FRP straight bars is the same as the number of reserved holes. Among them, 20 FRP straight bars respectively enclose the first FRP straight bar layer (10 FRP straight bars) and the second FRP straight bar layer (10 FRP straight bars). The first FRP straight bar layer and the second FRP straight bar layer are located on both sides of the FRP spiral bars, and the first FRP straight bar layer and the second FRP straight bar layer respectively correspond to the two installation layers.
[0032] Please refer to Figure 2-5 , an end cap is installed at both ends of the ECC matrix; the end cap is made of steel; protrusions are provided on the inner and outer wall edges of the contact end of the end cap with the ECC matrix; the end cap is provided with anchoring holes penetrating through the end cap. The number of anchoring holes is the same as the number of reserved holes. The part of the anchoring hole close to the ECC matrix is in the shape of an inverted truncated cone, and the part of the anchoring hole far from the ECC matrix is cylindrical, and internal threads are provided in the cylindrical part of the anchoring hole.
[0033] Please refer to Figure 3-7 , the number of anchoring blocks is 3. The 3 anchoring blocks are combined to form a truncated cone structure. The truncated cone structure is a steel block in the shape of a truncated cone with an angle of 2π / 3 radians. A through hole is provided in the middle of the truncated cone structure, and the inner diameter of the through hole is slightly smaller than the outer diameter of the FRP straight bar; friction cross stripes parallel to the frustum are provided on the wall of the through hole; the outer diameter of the anchoring nut is adapted to the upper cylindrical diameter of the anchoring hole of the end cap and corresponding external threads are provided. The inner diameter of the anchoring nut is slightly larger than the diameter of the FRP straight bar, and protrusions are provided along the circumference at the top of the anchoring nut.
[0034] Please refer to Figure 1-7 , the installation of the FRP straight bars needs to wait until the ECC matrix prepared from the ECC material has completed the curing period. Pass the FRP straight bars through the reserved holes, insert the 3 anchoring blocks into the anchoring holes of the end cap, first tap gently to make them drop evenly and the upper surfaces are flush, then put on the anchoring nut and tighten to complete the anchoring at one end; use a stretching device to clamp the other end of the FRP straight bar, apply a tensile force to the set value and maintain it for 30 seconds, then insert the anchoring block into the anchoring hole, put on the anchoring nut and tighten to complete the anchoring. The core wrapped area (formed by the concrete column and the corresponding steel bars) is configured with longitudinal steel bars and circumferential steel bars along the length direction, and the voids are filled with poured concrete.
[0035] The specific implementation process of the anti-seepage high-strength concrete column is as follows: First, carry out the design and construction of the precast column casing. The middle section of the precast column casing is made by combining FRP spiral bars with the ECC matrix. The FRP spiral bars are located at the midline of the casing wall. Before pouring the ECC material, install and fix plastic pipes, and then pour the ECC material until it takes shape. Symmetrically reserve holes on both sides of the FRP spiral bars in the ECC matrix. The size of the reserved holes is adjusted according to the thickness of the column wall. The two end caps are respectively in contact with the ECC matrix, and cooperate with the subsequent anchor blocks and anchor nuts for anchoring. The installation of the FRP straight bars needs to wait until the ECC material has completed curing. Pass the FRP straight bars through the reserved holes, stuff three anchor blocks into the anchor holes of the end caps, gently tap them to make them drop evenly, and make the upper surfaces flush. Then, put on the anchor nuts and tighten them to complete the anchoring at one end. Clamp the other end of the FRP straight bar with a stretching device, apply a tensile force to the set value and maintain it for 30 seconds, stuff the anchor block into the anchor hole, put on the anchor nut, and tighten it to complete the anchoring. Transport the precast column casing to the construction site. After installation and fixation, it serves as the formwork for the reinforced concrete column. Configure longitudinal steel bars and circumferential steel bars along the length direction, and fill and pour concrete in the gaps. Complete the construction and production of the anti-seepage high-strength column through on-site curing.
[0036] The utility model innovatively enhances the overall strength of the precast column casing through the combined design of FRP spiral bars and ECC materials, forming a triaxial compression state in the core wrapped area (composed of the concrete column and the corresponding steel bars) under compression, providing additional bearing capacity. At the same time, the application of longitudinal pre-tension can further improve the tensile strength of the precast column casing, effectively inhibit the generation of micro-cracks in the working state of the ECC material, and improve the crack resistance and durability of the column.
[0037] In the utility model, the precast column casing is used as the formwork for the concrete column, which can improve the engineering construction efficiency, reduce the on-site construction time, and at the same time help to ensure the construction quality. The design of the precast column casing can also simplify the construction process and reduce the construction difficulty.
[0038] In the utility model, the pre-tension anchoring of the FRP straight bars adopts an adjustable form, and during the service of the component, the longitudinal tension can also be increased to repair the micro-cracks in the ECC matrix of the precast column casing. It provides a new idea for the design of reinforced concrete columns in special environments and conforms to the strategic goal of the sustainable development of the construction industry.
[0039] The above embodiments are the preferred embodiments of the utility model, but the embodiments of the utility model are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the utility model shall be equivalent replacement methods and are all included in the protection scope of the utility model.
Claims
1. An anti-seepage high-strength concrete column, characterized in that, It includes a concrete column and an ECC matrix arranged in sequence from the inside to the outside, and FRP straight bars and FRP spiral bars are arranged in the ECC matrix; It also includes end caps. The number of end caps is two, and the two end caps are respectively connected to both ends of the ECC matrix; The end cap is provided with an anchoring hole. The FRP straight bar extends outward from the ECC matrix, and the part of the FRP straight bar outside the ECC matrix passes through the anchoring hole. An anchoring block is inlaid at the anchoring hole, and the anchoring hole and the anchoring block cooperate to anchor the FRP straight bar; The number of anchoring blocks is three. The three anchoring blocks are combined to form a frustum of a cone structure with a through hole. The frustum of a cone structure is sleeved on the outer surface of the FRP straight bar through the through hole, and the frustum of a cone structure is inlaid into the anchoring hole.
2. The anti-seepage high-strength concrete column according to claim 1, characterized in that: The ECC matrix is a tubular structure, and the FRP spiral bar is located at the center line of the tube wall of the ECC matrix.
3. An anti-seepage high-strength concrete column according to claim 1, characterized in that: It also includes an anchoring nut. The anchoring hole is provided with internal threads, the anchoring nut is provided with external threads, and the anchoring nut and the anchoring hole are matched through the external threads and the internal threads. The anchoring nut is used to press the frustum of a cone structure in the anchoring hole.
4. An anti-seepage high-strength concrete column according to claim 1, characterized in that: The contact surface between the end cap and the ECC matrix is provided with protrusions.
5. A waterproof and high-strength concrete column according to claim 1, characterized in that: The number of FRP straight bars is multiple, and among them, multiple FRP straight bars respectively enclose a first FRP straight bar layer and a second FRP straight bar layer, and the first FRP straight bar layer and the second FRP straight bar layer are located on both sides of the FRP spiral bar.
6. The anti-seepage high-strength concrete column according to claim 1, characterized in that: Longitudinal steel bars are arranged in the concrete column.
7. An anti-seepage high-strength concrete column according to claim 1, characterized in that: Circumferential steel bars are arranged on the side wall of the concrete column.