Double-layer prestressed steel strand net-ECC reinforced concrete wall
Through the coordinated reinforcement of the double-layer prestressed steel strand mesh and cement-based composite material (ECC), the existing concrete wall reinforcement methods have solved the problems of large spatial impact, material dependence on construction quality, poor refractory performance and secondary stress, and the efficient reinforcement of concrete walls has been achieved, significantly improving its bearing capacity and seismic resistance.
Patent Information
- Application Number
- CN202422072722.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The existing concrete wall reinforcement methods have problems such as large spatial impact, material dependence on construction quality, poor fire resistance and secondary stress, resulting in unsatisfactory reinforcement effect.
The double-layer prestressed steel strand mesh is used to coordinate reinforcement with cement matrix composite material (ECC). The reinforcement rate and seismic resistance of concrete walls are improved through the prestressed steel strand mesh, and the high ductility and toughness of ECC are used to prevent cracks from spreading.
It significantly improves the axial pressure bearing capacity, deformation capacity and failure mode of concrete walls, extends the service life, and improves the stability and reliability of reinforcement.
Smart Images
Figure CN223018256U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building construction, and particularly relates to a double-layer prestressed steel strand mesh-ECC reinforced concrete wall. Background Technique
[0002] With the acceleration of the urbanization process, due to the long service life, problems such as material aging and structural damage of a large number of old buildings and infrastructure are becoming increasingly prominent, and many old buildings also need to be functionally renovated and upgraded. Therefore, the demand for concrete building reinforcement is increasing.
[0003] At present, the main methods for reinforcing concrete walls are the method of increasing the cross-section and the method of pasting steel plates. The method of increasing the cross-section significantly increases the self-weight of the structure and has a greater impact on the building space. The method of pasting steel plates has high requirements for construction quality, and the reinforcement quality is significantly affected by materials. The bonding agent used for pasting has poor fire resistance and is easy to age. Moreover, the above reinforcement methods have the problem of secondary stress, that is, they can only gradually take effect after the deformation of the reinforced component continues to increase. Therefore, the crack width and deflection will still continue to increase after reinforcement. Content of the Utility Model
[0004] The utility model provides a double-layer prestressed steel strand mesh-ECC reinforced concrete wall. Applying initial prestress to multiple steel strands can close the original structural cracks and inhibit the development of cracks. Using a cement-based composite material (ECC) with high ductility, toughness and crack dispersion control ability to work together with the prestressed steel strand mesh can effectively improve the axial compression bearing capacity, deformation ability and failure mode of the concrete wall.
[0005] The utility model adopts the following technical solutions.
[0006] A double-layer prestressed steel strand mesh-ECC reinforced concrete wall includes an original concrete wall. Corresponding steel strand tensioning structures and steel strand fixing structures are provided at both ends of the original concrete wall. Both ends of multiple steel wires are installed on the original concrete wall through the steel strand tensioning structures and the steel strand fixing structures respectively. A steel strand mesh is arranged between the steel strand tensioning structure and the steel strand fixing structure, and a cement-based composite material is poured on the steel strand mesh.
[0007] As a further scheme of the utility model: the steel strand tensioning structure includes a first anchoring angle steel and a plurality of adjusting screws; holes corresponding to the plurality of adjusting screws are provided on the first anchoring angle steel, and the adjusting screws pass through the corresponding holes and are fixed on the first anchoring angle steel.
[0008] As a further scheme of the utility model: one end of the adjusting screw is provided with a fixing knot for fixing the steel wire to prevent the steel strand from slipping, and the other end is fastened to the first anchoring angle steel through a nut.
[0009] As a further solution of the present utility model: the fixing knot is an aluminum alloy ring chuck.
[0010] As a further solution of the present utility model: one end of the steel wire rope passes through the fixing knot and is fixed to the adjusting screw through an aluminum alloy joint, and prestress is applied through the adjusting screw and the nut.
[0011] As a further solution of the present utility model: the steel strand fixing structure includes a second anchoring angle steel, and through holes corresponding to the first anchoring angle steel are provided on the second anchoring angle steel; the other end of the steel wire rope passes through the through holes on the second anchoring angle steel and is fixed by an aluminum alloy joint.
[0012] As a further solution of the present utility model: both the first anchoring angle steel and the second anchoring angle steel are fixed to the original concrete wall by chemical bolts.
[0013] As a further solution of the present utility model: a plurality of steel strand nets are fixedly arranged at intervals between the first anchoring angle steel and the second anchoring angle steel, and the steel strand nets are fixed to the original concrete wall by bolts.
[0014] As a further solution of the present utility model: the steel strand net adopts a steel strand mesh.
[0015] As a further solution of the present utility model: the anchor bolts of the steel strand mesh adopt high-strength bolts or chemical bolts.
[0016] Compared with the existing technology, the present utility model has the following beneficial effects:
[0017] 1. The present utility model adopts a multi-layer layout of prestressed steel strands, which increases the number of steel strands, thereby improving the reinforcement ratio of the concrete wall, enhancing its overall bearing capacity and seismic performance, improving its stress performance, and extending its service life.
[0018] 2. The high ductility and toughness of the cement-based composite material (ECC) can effectively absorb and disperse the energy generated by external forces, thereby preventing the expansion of cracks and the damage of the structure. The prestressed steel strand net provides additional support and restraint for the cement-based composite material (ECC) with its high strength and stiffness, making the entire reinforcement system more stable and reliable.
[0019] 3. The present utility model uses an aluminum alloy chuck to anchor the end of the steel strand and applies prestress by tightening the adjusting bolt, simplifying the construction process and eliminating the need for special tensioning equipment, thereby improving the construction efficiency.
[0020] 4. The utility model can fix multiple steel strands with one anchoring angle steel, which has significant advantages in structure reinforcement and construction. It can not only reduce costs and improve construction efficiency, but also reduce the number of bolts on the premise of meeting connection reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to make the objectives, technical solutions and advantages of the present disclosure clearer and more understandable, the following further elaborates on the technical solutions of the present disclosure in detail with reference to specific embodiments and the following drawings.
[0022] Figure 1 FIG. is a schematic diagram of the overall structure of a double-layer prestressed steel strand mesh-ECC reinforced concrete wall for an embodiment;
[0023] Figure 2 FIG. is a schematic diagram of the tensioning structure of the reinforced concrete wall for an embodiment;
[0024] Figure 3 FIG. is a schematic diagram of the fixing structure of the reinforced concrete wall for an embodiment;
[0025] In the figures, 1 - first anchoring angle steel, 2 - adjusting screw, 3 - nut, 4 - high-strength bolt, 5 - fixing knot, 6 - second anchoring angle steel, 7 - steel strand mesh, 8 - cement-based composite material, 9 - original concrete wall, 10 - aluminum alloy joint, 11 - steel wire rope. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0027] As Figures 1 to 3 shown, a double-layer prestressed steel strand mesh-ECC reinforced concrete wall in this embodiment includes an original concrete wall 9, a steel strand mesh, a steel strand tensioning structure, a steel strand fixing structure, and a cement-based composite material; both ends of multiple steel wire ropes 11 are installed on the original concrete wall 9 through the steel strand tensioning structure and the steel strand fixing structure respectively. A steel strand mesh 7 is provided between the steel strand tensioning structure and the steel strand fixing structure, and the cement-based composite material is poured on the steel strand mesh 7.
[0028] The steel strand tensioning structure includes a first anchoring angle steel 1 and multiple adjusting screws 2; holes corresponding to the multiple adjusting screws 2 are provided on the first anchoring angle steel, and each adjusting screw 2 is fixed on the first anchoring angle steel 1 through a nut 3.
[0029] As Figure 2As shown, the first anchoring angle steel 1 is fixed to the original concrete wall by chemical bolts 3.
[0030] One end of each adjusting screw rod 2 is provided with a fixing knot 5 for fixing the steel wire rope to prevent the steel strand from slipping; the fixing knot 5 is an aluminum alloy ring chuck and can be pressed by a hydraulic crimper.
[0031] One end of the steel wire rope 11 passes through the ring chuck of the fixing knot 5 and is fixed to the adjusting screw rod 2 through an aluminum alloy joint 10.
[0032] As Figure 3 shown, the steel strand fixing structure includes a second anchoring angle steel 6, and the second anchoring angle steel 6 is fixed to one end of the original concrete wall corresponding to the first anchoring angle steel 1 by chemical bolts 3; the second anchoring angle steel 6 is provided with through holes corresponding to the first anchoring angle steel 1, and the other end of the steel wire rope 11 passes through the through holes on the second anchoring angle steel 6 and is fixed by an aluminum alloy joint.
[0033] In this embodiment, two steel wire ropes 11 are used to arrange the prestressed steel strands in a double layer, so as to increase the reinforcement ratio of the concrete wall and enhance its overall bearing capacity and seismic performance, etc.
[0034] A plurality of steel strand meshes 7 are fixedly arranged at intervals between the first anchoring angle steel 1 and the second anchoring angle steel 6, and the steel strand meshes 7 are fixed to the original concrete wall 9 by bolts. The distance between the steel strand meshes 7 can be set according to the actual situation. Due to its high tensile strength, the steel strand mesh 7 serves as the stressed main body for reinforcement and is bonded to the original concrete wall and the original structure through ECC to form an integral force.
[0035] The steel strand mesh 7 is preferably a finished product of a steel strand mesh sheet, and the anchor bolts of the steel strand mesh sheet can be high-strength bolts 4 or chemical bolts.
[0036] To implement the method for strengthening a concrete wall with a double-layer prestressed steel strand mesh - ECC, the following steps are included:
[0037] Step 1): Clean the surface of the original concrete wall, preferably using a angle grinder to polish until a new structural surface is exposed; blow off the floating dust with compressed air and clean it with a high-pressure water gun.
[0038] Step 2): Fix the first anchoring angle steel 1 and the second anchoring angle steel 6 to the corresponding two ends of the original concrete wall respectively through bolts.
[0039] Step 3): Pass one end of the steel wire rope through the through hole of the second anchoring angle steel 6 and fix it with an aluminum alloy joint, pass the other end of the steel wire rope through the fixing knot 5 of the first anchoring angle steel 1, tighten the steel wire and anchor it through an aluminum alloy joint.
[0040] After both ends are fixed, further tighten the nut of the adjusting screw rod 2 to apply prestress. The adjusting screw rod drives the steel wire rope to move towards the anchoring angle steel together, so that the tensile force of the steel strand and the tightening torque of the nut gradually increase. When the target prestress designed for the steel strand is reached, stop tightening. Apply prestress to each steel strand using the above method.
[0041] Step 4): Fix multiple steel strand meshes 7 between the first anchoring angle steel 1 and the second anchoring angle steel 6 using bolts, and firmly fix them to the original concrete wall at the node parts of the steel strand mesh 7 using bolts to ensure the stability of the overall mesh.
[0042] Step 5): Fix the formwork on the outside of the steel strand mesh using fasteners and a support system. Wood formwork or steel formwork can be selected. Further pour cementitious composite material (ECC). After the concrete strength reaches the design requirements, remove the formwork.
[0043] The combined reinforcement technology of the cementitious composite material (ECC) and the steel strand mesh adopted by the present utility model is an efficient, economical and practical reinforcement method. This structure can significantly improve the performance and durability of the concrete structure, provide a strong guarantee for the safety and stability of the engineering structure, and can be applied to large concrete structure projects for reinforcement and repair, such as old buildings or buildings with potential safety hazards.
[0044] For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of this application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of this application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in this application. Any reference signs in the claims should not be regarded as limiting the claims involved.
Claims
1. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall, comprising an original concrete wall (9), characterized in that: Corresponding steel strand tensioning structures and steel strand fixing structures are provided at both ends of the original concrete wall (9); the two ends of a plurality of steel wire ropes are respectively installed on the original concrete wall (9) through the steel strand tensioning structures and the steel strand fixing structures; a steel strand mesh (7) is provided between the steel strand tensioning structures and the steel strand fixing structures; and a cement-based composite material is poured on the steel strand mesh (7).
2. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 1, characterized in that: The steel strand tensioning structure comprises a first anchoring angle steel (1) and a plurality of adjusting screws (2); the first anchoring angle steel is provided with holes corresponding to the plurality of adjusting screws (2), and the adjusting screws (2) pass through the corresponding holes and are fixed on the first anchoring angle steel (1).
3. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 2, characterized in that: One end of the adjusting screw rod (2) is provided with a fixing knot (5) for fixing the steel wire rope to prevent the steel strand from slipping, and the other end is fastened to the first anchor angle steel (1) via a nut (3).
4. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 3, characterized in that: The fixing knot (5) is an aluminum alloy annular clamp.
5. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to any one of claims 1 to 4, characterized in that: One end of the steel wire rope passes through a fixing knot (5) and is fixed to the adjusting screw (2) via an aluminum alloy joint (10), and prestress is applied via the adjusting screw (2) and the nut (3).
6. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 5, characterized in that: The steel strand fixing structure comprises a second anchor angle steel (6), on which a through hole corresponding to the first anchor angle steel (1) is provided; the other end of the steel wire rope passes through the through hole on the second anchor angle steel (6) and is fixed with an aluminum alloy joint.
7. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 6, characterized in that: The first anchor angle steel (1) and the second anchor angle steel (6) are both fixed to the original concrete wall (9) by chemical bolts.
8. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 6, characterized in that: A plurality of steel strand meshes (7) are fixed at intervals between the first anchor angle steel (1) and the second anchor angle steel (6), and the steel strand meshes (7) are fixed to the original concrete wall (9) by means of bolts.
9. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 1, characterized in that: The steel strand mesh (7) is a steel strand mesh sheet.
10. A double-layer prestressed steel strand mesh-ECC reinforced concrete wall according to claim 9, characterized in that: The anchor bolts of the steel strand mesh are high-strength bolts (4) or chemical bolts.