Frame beam-column joint reinforcing device and method based on steel strand net reinforced ECC
Through the high-strength steel strand mesh, the combination of ECC material and preloading device is enhanced, and the problem of improving bearing capacity and seismic performance in the RC beam and column node reinforcement method is solved, significant performance improvement and construction convenience are achieved, and existing technology is solved. Inadequate of the reinforcement method of RC beam and column nodes.
Patent Information
- Application Number
- CN202411711740.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-01-07
AI Technical Summary
The existing RC beam and column node reinforcement methods are difficult to achieve comprehensive improvements in bearing capacity, ductility, toughness and crack resistance, which has led to the research and application of new reinforcement methods becoming a hot topic.
High-strength steel strand mesh is used to enhance ECC material, and prestress is applied to the steel strand through a special preloading device. Combined with the interlaced mesh arrangement and bending fixing device, the bearing capacity and seismic resistance of the node are significantly improved.
It significantly improves the bearing capacity and seismic resistance of RC beam and column nodes, and is convenient to construct, good economical, high material performance utilization rate, and significant effect.
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Figure CN119266588A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of building engineering structure reinforcement, and in particular to a frame beam-column node reinforcement device and method based on steel strand mesh reinforced ECC. Background Art
[0002] Existing concrete buildings, bridges, dams and hydraulic structures have suffered varying degrees of damage due to age and accidental effects. If they are completely demolished and rebuilt, not only will the reconstruction cost be high, but the waste disposal costs will also be higher, and it will also cause great urban environmental pollution and waste of resources. Therefore, strengthening existing buildings is a top priority in today's construction industry. At present, the main methods for seismic reinforcement of reinforced concrete (RC) beam-column joints include increasing the cross-section, external steel reinforcement, fiber reinforced composite (FRP) reinforcement, etc. However, the above traditional reinforcement methods still have various shortcomings, and it is difficult to achieve a significant improvement in the comprehensive performance of RC beam-column joints, such as bearing capacity, ductility, toughness, and crack resistance. This makes the research and application of new reinforcement methods a hot topic in the engineering field.
[0003] In the prior art, high-strength steel strand wire mesh (HSSWM) is used to reinforce ultra-high toughness cementitious composite (Engineered Cementitious Composite, ECC) to form a new high-performance composite material "steel strand mesh reinforced ECC (HSSWM-ECC)", which has excellent properties such as high strength, ultra-high ductility, toughness and crack dispersion ability. The maximum crack width of the saturated state of tensile and bending cracks is less than 0.2mm (corresponding to 90% of the ultimate load), and the ultimate tensile strain is between 3% and 5%. The steel strand and ECC have excellent bonding properties and the ultimate tensile strain is close, which is enough to ensure better cooperation between the two. While giving full play to the strength of the steel strand and the deformation capacity of ECC, the cracks can also be effectively controlled. In order to achieve a significant improvement in the comprehensive performance of the RC beam-column node, such as bearing capacity, ductility, toughness, and crack resistance, the present invention applies the steel strand mesh reinforced ECC to the reinforcement of the RC beam-column node, and proposes a frame beam-column node reinforcement device and method based on the steel strand mesh reinforced ECC. Summary of the invention
[0004] In order to solve the above-mentioned problems, the present invention provides a frame beam-column node reinforcement device and method based on steel strand mesh reinforced ECC. The method uses a high-strength steel strand mesh to reinforce ECC, a new type of material, and uses a special prestressing device to apply a certain prestress to the steel strand, which significantly improves the bearing capacity and seismic performance of the node, and is easy to construct and economical.
[0005] In the first aspect, the present invention provides a frame beam-column node reinforcement device based on steel strand mesh reinforced ECC, which adopts the following technical solution: A frame beam-column node reinforcement device based on steel strand mesh reinforced ECC, comprising: Transverse steel strands, longitudinal steel strands, pre-tensioning devices and fixing devices are respectively provided with predetermined spacings. The transverse steel strands and longitudinal steel strands are staggered and assembled into a mesh. The pre-tensioning device is used to fix the transverse steel strands and longitudinal steel strands on the node reinforcement surface. The fixing device is used to bend and fix the longitudinal steel strands at the corners to prevent them from collapsing during stress.
[0006] Furthermore, the pre-tensioning device comprises a transverse steel strand pre-tensioning device and a longitudinal steel strand pre-tensioning device.
[0007] Furthermore, the transverse steel strand pre-tensioning device includes two figure-eight aluminum buckles, a positive thread swing bolt, a negative thread swing bolt and a positive and negative thread hexagonal nut. The two ends of the steel strand of the transverse steel strand pre-tensioning device pass through the two figure-eight aluminum buckles and the ring buckle end of the positive thread swing bolt, and the steel strand is fixed to the component through the positive and negative thread hexagonal nut.
[0008] Furthermore, the longitudinal steel strand pre-tensioning device comprises an eight-shaped aluminum buckle, an orthogonal movable bolt and an orthogonal hexagonal nut; each end of the steel strand of the longitudinal steel strand pre-tensioning device passes through the ring buckle end of the eight-shaped aluminum buckle and the orthogonal movable bolt, and is fixed to the right-angle steel through the orthogonal hexagonal nut.
[0009] Furthermore, the fixing device adopts a perforated right-angle steel, including a steel strand end fixing device and a steel strand angle fixing device.
[0010] Furthermore, one leg of the right-angle steel of the steel strand end fixing device has a hole set on the component surface, and the other leg has a hole set perpendicularly to the component surface to fix the steel strand.
[0011] Furthermore, the two openings of the steel strand angle fixing device are fixed at the beam-column corners to bend the steel strand.
[0012] In a second aspect, a frame beam-column node reinforcement method based on steel strand mesh reinforced ECC comprises: Step S1, passing the two ends of the steel strand through the eight-shaped aluminum buckle and the buckle end of the swing bolt respectively; Step S2, grinding the surface to be reinforced of the concrete component to be reinforced; Step S3, grinding a groove on the concrete surface at the right angle steel at the end of the steel strand to be fixed; Step S4, drilling holes in the grooves, and evenly applying building structural adhesive to the grooves; Step S5, placing the right-angle steel at the end of the steel strand into the groove and fixing it; Step S6, passing the orthogonal joint bolt at the end of the longitudinal steel strand through the opening of the right-angle steel and fixing it with an orthogonal hexagonal nut and keeping it in a loose state; Step S7, bend the longitudinal steel strands at the corners of the beams and columns into right angles, punch holes at corresponding positions at the corners, and fix the corner steel strands into right angles; Step S8, fix the transverse steel strand into a ring shape using hexagonal nuts with positive and negative threads; Step S9, tighten the hexagonal nuts at the ends of each longitudinal steel strand to ensure that the steel strand is tightened; Step S10: spraying an interface agent on the polished surface, pouring cement-based materials and curing.
[0013] Furthermore, the punching position in step S4 corresponds to the position of the angle steel hole, and the punching hole diameter and the angle steel hole diameter are respectively consistent with the expansion bolt diameter.
[0014] Furthermore, the punching position in step S7 corresponds to the position of the angle steel hole, and the punching hole diameter and the angle steel hole diameter are respectively consistent with the expansion bolt diameter.
[0015] In summary, the present invention has the following beneficial technical effects: Compared with the traditional method, the present invention can better exert the performance of the material, improve the utilization rate, and have a significant reinforcement effect by using a high-strength steel strand mesh to strengthen the ECC beam-column joint.
[0016] By using high-strength steel strand mesh to reinforce the new ECC material and using a special prestressing device to apply a certain amount of prestress to the steel strands, the bearing capacity and seismic performance of the node can be significantly improved, and the construction is convenient and economical. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of a frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to an embodiment of the present invention.
[0018] Figure 2 It is a front view of a frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to an embodiment of the present invention.
[0019] Figure 3 It is a top view of a frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to an embodiment of the present invention.
[0020] Figure 4 It is a left view of a frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to an embodiment of the present invention.
[0021] Figure 5It is a schematic structural diagram of a pre-tightening device and a fixing device according to an embodiment of the present invention.
[0022] Figure 6 Schematic diagram of the arrangement of the steel strand bundle according to an embodiment of the present invention.
[0023] Among them, 1. Orthogonal joint bolt; 2. Orthogonal hexagonal nut; 3. S-shaped aluminum buckle; 4. Longitudinal steel strand; 5. Transverse steel strand; 6. Corner angle steel; 7. Right-angle angle steel; 8. Expansion bolt; 9. Intersection point of longitudinal steel strand and transverse steel strand; 10. Orthogonal and reverse hexagonal nut; 11. Reverse joint bolt; 12. Steel strand bundle. DETAILED DESCRIPTION
[0024] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0025] Example 1 Reference Figure 1 The present embodiment is a reinforced concrete frame beam-column node reinforcement device based on high-strength steel strand mesh reinforced ECC, the device includes transverse steel strands 5 with predetermined spacing, longitudinal steel strands 4, a pre-tightening device and a fixing device, the transverse steel strands 5 and the longitudinal steel strands 4 are staggered and spliced into a mesh, the pre-tightening device is used to fix the transverse steel strands 5 and the longitudinal steel strands 4 on the node reinforcement surface, and the fixing device can bend and fix the longitudinal steel strands 4 at the corners to prevent them from collapsing during the stress process.
[0026] In the above-mentioned reinforced concrete frame beam-column node reinforcement device based on high-strength steel strand mesh reinforced ECC, as a preferred solution, the pre-tensioning device includes a pre-tensioning device for transverse steel strands and a pre-tensioning device for longitudinal steel strands.
[0027] like Figure 2 As shown, in the above-mentioned reinforced concrete frame beam-column node reinforcement device based on high-strength steel strand mesh reinforced ECC, as a preferred scheme, the pre-tightening device of the transverse steel strand includes two eight-shaped aluminum buckles 3, a positive thread swing bolt 1, a reverse thread swing bolt 11 and a positive and reverse thread hexagonal nut 10, and the pre-tightening device of the longitudinal steel strand includes an eight-shaped aluminum buckle 3, a positive thread swing bolt 1 and a positive thread hexagonal nut 2.
[0028] like Figure 3As shown in the above-mentioned reinforced concrete frame beam-column node reinforcement device based on high-strength steel strand mesh reinforced ECC, as a preferred solution, the two ends of the steel strand of the transverse steel strand pre-tensioning device pass through the figure-eight aluminum buckle 3 and the ring buckle ends of the positive thread swing bolt 1 and the negative thread swing bolt 11, and the steel strand is fixed to the component by the positive and negative thread hexagonal nut 10; each end of the steel strand of the longitudinal steel strand pre-tensioning device passes through the figure-eight aluminum buckle 3 and the ring buckle end of the positive thread swing bolt 1, and is fixed to the right-angle steel by the positive thread hexagonal nut 2.
[0029] like Figure 4 As shown, in the above-mentioned reinforced concrete frame beam-column node reinforcement device based on high-strength steel strand mesh reinforced ECC, as a preferred solution, the fixing device adopts a perforated right-angle steel, including a steel strand end fixing device and a steel strand angle fixing device.
[0030] like Figure 5 As shown, in the above-mentioned reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred scheme, one leg of the right-angle angle steel 7 of the steel strand end fixing device has a hole set on the surface of the component, and the other leg has a hole and is perpendicularly set on the surface of the component to fix the steel strand; the two legs of the corner angle steel 6 of the steel strand angle fixing device have holes fixed at the beam-column corner to bend the steel strand, and the intersection point 9 of the longitudinal steel strand and the transverse steel strand.
[0031] like Figure 6 As shown, in the above-mentioned reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred solution, for frame beam-column nodes with orthogonal beams and floor slabs, inclined holes need to be drilled in the core area of the node to arrange X-shaped steel strand bundles 12.
[0032] Example 2 The difference between this embodiment and embodiment 1 is that this embodiment provides a reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred solution, including the following steps: Step S1, making a steel strand of corresponding length: passing two ends of the steel strand through the figure-eight aluminum buckle 3 and the buckle end of the movable bolt 1 respectively, and flattening the figure-eight aluminum buckle 3.
[0033] Step S2, grinding the surface of the concrete member to be reinforced so that the surface has a certain degree of roughness; Step S3, grinding grooves on the concrete surface at the right-angled angle steel 7 at the end of the steel strand to be fixed, so that the angle steel is sunk into the grinding surface of the concrete by a certain distance; Step S4, drilling holes in the grooves with an electric hammer, and evenly applying building structural adhesive to the grooves; Step S5, placing the right angle steel 7 at the end of the steel strand into the groove and fixing it with expansion bolts 8 and building structural adhesive; Step S6, pass the orthogonal movable bolt 1 at the end of the longitudinal steel strand 4 through the hole of the right-angle steel 7 and fix it with the orthogonal hexagonal nut 2 and keep it in a loose state.
[0034] Step S7, bend the longitudinal steel strands at the corners of the beams and columns into right angles, use an electric hammer to drill holes at the corresponding positions of the corners, and use right-angle angle steels 6 and building structural adhesive to fix the corner steel strands into right angles.
[0035] Step S8, according to the predetermined spacing between the transverse steel strands 5, fix the transverse steel strands 5 into a ring shape using positive and negative thread hexagonal nuts 10 and tighten the hexagonal nuts 10 using a wrench.
[0036] Step S9: Use a wrench to tighten the hexagonal nuts 2 at the ends of each longitudinal steel strand 4 to ensure that the steel strand is tightened.
[0037] Step S10: spraying an interface agent on the polished surface within the concrete reinforcement range, and then pouring cement-based materials and curing.
[0038] In the above-mentioned reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred scheme, the punching positions in step S4 and step S7 should correspond to the angle steel opening positions, and the punching hole diameter, opening hole diameter and expansion bolt 8 diameter should be unified.
[0039] In the above-mentioned reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred solution, in the node where the beam width is smaller than the column width, the first transverse steel strand 5 fixed to the beam end in step S8 needs to be positioned close to the junction of the beam and column, so that the full-length longitudinal steel strand 4 on the node surface extends along the slope from the column surface to the beam surface.
[0040] In the above-mentioned reinforced concrete frame beam-column node reinforcement method based on high-strength steel strand mesh reinforced ECC, as a preferred solution, the angle of the steel strand slope formed from the column surface to the beam surface must satisfy the requirement that the steel strand has a certain protective layer thickness after casting.
[0041] In the above specific embodiment, as a preference, the cast ECC material is called Engineered Cementitious Composites, which is mainly composed of cement, quartz sand, fly ash, microsilica powder, water, PVA fiber, polycarboxyl water reducer and thickener, etc., which are mixed in the optimal ratio of 1:0.4:2.5:0.073:0.8933:0.072:4.073:0.182, and other adaptive material ratios are also acceptable. It is mixed in a horizontal single-shaft forced concrete mixer.
[0042] In this example, one leg of the angle steel fixed to the concrete surface can adjust the position of the opening according to the actual component conditions, and the other leg can adjust the size and position of the opening according to the diameter and spacing of the steel strands.
[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A frame beam-column node reinforcement device based on steel strand mesh reinforced ECC, characterized in that: include: Transverse steel strands, longitudinal steel strands, pre-tensioning devices and fixing devices are respectively provided with predetermined spacings. The transverse steel strands and longitudinal steel strands are staggered and assembled into a mesh. The pre-tensioning device is used to fix the transverse steel strands and longitudinal steel strands on the node reinforcement surface. The fixing device is used to bend and fix the longitudinal steel strands at the corners to prevent them from collapsing during stress.
2. A frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 1, characterized in that: The pre-tensioning device comprises a transverse steel strand pre-tensioning device and a longitudinal steel strand pre-tensioning device.
3. A frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 2, characterized in that: The transverse steel strand pre-tensioning device comprises two figure-eight aluminum buckles, a positive thread swing bolt, a negative thread swing bolt and a positive and negative thread hexagonal nut. The two ends of the steel strand of the transverse steel strand pre-tensioning device pass through the two figure-eight aluminum buckles and the ring buckle end of the positive thread swing bolt, and the steel strand is fixed to the component through the positive and negative thread hexagonal nut.
4. The frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 3 is characterized in that: The longitudinal steel strand pre-tensioning device comprises an eight-shaped aluminum buckle, an orthogonal movable bolt and an orthogonal hexagonal nut; each end of the steel strand of the longitudinal steel strand pre-tensioning device passes through the ring buckle end of the eight-shaped aluminum buckle and the orthogonal movable bolt, and is fixed to the right-angle steel through the orthogonal hexagonal nut.
5. The frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 4 is characterized in that: The fixing device adopts a perforated right-angle steel, and comprises a steel strand end fixing device and a steel strand angle fixing device.
6. A frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 5, characterized in that: One leg of the right-angle steel of the steel strand end fixing device has a hole set on the component surface, and the other leg has a hole set perpendicularly to the component surface for fixing the steel strand.
7. The frame beam-column node reinforcement device based on steel strand mesh reinforced ECC according to claim 6 is characterized in that: The two openings of the steel strand angle fixing device are fixed at the beam-column corners to bend the steel strand.
8. A method for reinforcing frame beam-column nodes based on steel strand mesh reinforced ECC, characterized in that: include: Step S1, passing the two ends of the steel strand through the eight-shaped aluminum buckle and the buckle end of the swing bolt respectively; Step S2, grinding the surface to be reinforced of the concrete component to be reinforced; Step S3, grinding a groove on the concrete surface at the right angle steel at the end of the steel strand to be fixed; Step S4, drilling holes in the grooves, and evenly applying building structural adhesive to the grooves; Step S5, placing the right-angle steel at the end of the steel strand into the groove and fixing it; Step S6, passing the orthogonal joint bolt at the end of the longitudinal steel strand through the opening of the right-angle steel and fixing it with an orthogonal hexagonal nut and keeping it in a loose state; Step S7, bend the longitudinal steel strands at the corners of the beams and columns into right angles, punch holes at corresponding positions at the corners, and fix the corner steel strands into right angles; Step S8, fix the transverse steel strand into a ring shape using hexagonal nuts with positive and negative threads; Step S9, tighten the hexagonal nuts at the ends of each longitudinal steel strand to ensure that the steel strand is tightened; Step S10: spraying an interface agent on the polished surface, pouring cement-based materials and curing.
9. The method for reinforcing frame beam-column nodes based on steel strand mesh reinforced ECC according to claim 6, characterized in that: In the step S4, the punching position corresponds to the angle steel hole position, and the punching hole diameter and the angle steel hole diameter are respectively consistent with the expansion bolt diameter.
10. A frame beam-column node reinforcement method based on steel strand mesh reinforced ECC according to claim 9, characterized in that: In the step S7, the punching position corresponds to the angle steel hole position, and the punching hole diameter and the angle steel hole diameter are respectively consistent with the expansion bolt diameter.