A secondary reinforcing device and method for reinforced concrete beams with non-removable reinforcing plates

Abstract

The application provides a secondary reinforcement device and method for reinforced concrete beams with reinforced steel plates, which comprises anchoring members, connecting steel bars and a reinforced concrete layer. The device is used for concrete beams and reinforced steel plates, the steel plates are attached to the surface of the concrete beams and are connected and anchored by bolts. The anchoring members are connected to the concrete beams, and at the same time, the anchoring members are arranged below the steel plates. The anchoring members are connected as a whole by the connecting steel bars. The reinforced concrete layer is filled in the area where the anchoring members, the connecting steel bars and the steel plates are located. The application improves the bending bearing capacity and stiffness of the concrete beams without removing the existing reinforced steel plates, reduces the construction steps, improves the construction efficiency, and uses the geopolymer concrete which has low carbon emission and strong fire resistance, so as to ensure green environmental protection and high temperature resistance during the construction process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete reinforcement, in particular to a secondary reinforcement device and method for reinforced concrete beam with removable reinforcement steel plate. BACKGROUND

[0002] Bolt-anchored steel plate reinforced concrete beam is a common structure reinforcement technology, which can significantly improve the flexural capacity, stiffness and seismic performance of the reinforced concrete beam, and has been widely used in bridge and building structure repair and reinforcement engineering. However, under the action of severe service environment, not only the bolt-anchored steel plate reinforced concrete beam structure itself may be further damaged, such as internal steel corrosion, concrete mechanical property deterioration, and even the steel plate and bolt in the reinforcement system may also be corroded, the mechanical property of the structural adhesive for bonding may also be degraded, which affects the stress cooperation between the steel plate and the concrete beam, resulting in the gradual degradation of the mechanical property of the bolt-anchored steel plate reinforced concrete beam and the need for secondary reinforcement treatment.

[0003] At present, the common concrete structure reinforcement measures mainly include the increase of cross section method, the external bonding of carbon fiber reinforced polymer method and the prestressed reinforcement method. Among them, the increase of cross section method usually plants steel bars on the existing concrete beam cross section and pours concrete of a certain thickness to improve the structural bearing capacity; the external bonding of carbon fiber reinforced polymer method bonds carbon fiber reinforced polymer fabric or plate on the tension side of the existing concrete beam to improve the structural bearing capacity by using the high strength and light quality characteristics of the carbon fiber reinforced polymer; the prestressed reinforcement method improves the flexural capacity of the structure by adding prestressed steel strand or fiber reinforced polymer in the existing concrete beam.

[0004] However, for the concrete beam reinforced by bolt-anchored steel plate, the above-mentioned existing concrete structure reinforcement methods still have deficiencies. Specifically, the increase of cross section method usually needs to remove the protective layer of the existing concrete beam and the steel plate, and in addition, steel bars need to be planted to improve the stress cooperation between the post-poured cross section and the existing cross section, which has a large amount of work on site; the bonding of carbon fiber reinforced polymer also needs to remove the steel plate and anchor bolt in the primary reinforcement to provide a working surface, and the structural adhesive for bonding has the risk of mechanical property degradation under severe service environment; the prestressed reinforcement method needs to add anchoring devices at the ends of the existing concrete beam, and the tensioning and construction work is relatively complex. Therefore, the existing concrete structure reinforcement technology cannot meet the secondary reinforcement needs of the bolt-anchored steel plate reinforced concrete beam. SUMMARY

[0005] The purpose of the present application is to provide a secondary reinforcement scheme for reinforced concrete beam with removable reinforcement steel plate, which can effectively improve the bonding performance between the post-poured reinforcement layer and the existing concrete beam without removing the existing reinforcement steel plate, simplify the secondary reinforcement construction process and improve the structure reinforcement efficiency.

[0006] In order to achieve the above object, the application provides a secondary reinforcement anchoring device for reinforcing a reinforced concrete beam with a steel plate, comprising anchoring members, connecting steel bars and a reinforced concrete layer, which is used for reinforcing the concrete beam and the steel plate adhered to the surface of the concrete beam through bolt connection and anchoring;

[0007] The anchoring members are connected to the concrete beam, and the anchoring members are arranged below the steel plate, the anchoring members are connected as a whole through the connecting steel bars, and the reinforced concrete layer is filled in the area where the anchoring members, the connecting steel bars and the steel plate are located.

[0008] Further, the anchoring member comprises a top vertical plate, a flange plate and a bottom vertical plate; the top vertical plate is provided with a notch for accommodating the steel plate, and the notch has a gap with the steel plate after the anchoring member is installed in place; the flange plate is horizontally arranged, and the bottom vertical plate is arranged below the top vertical plate.

[0009] Further, a plurality of notches are arranged on the top vertical plate of a single anchoring member, and the protruding part of the top vertical plate after being notched is an anchoring point connected to the concrete beam.

[0010] Further, the flange plate and the bottom vertical plate are both provided with an opening, which is used to improve the flowability of the reinforced concrete layer during filling and to make the combination of the reinforced concrete layer more firm.

[0011] Further, the openings on the flange plate and the bottom vertical plate are arranged in a staggered manner.

[0012] Further, a welding hole is arranged on the anchoring member, which is connected to the connecting steel bar and fixed through welding.

[0013] Further, the welding hole is arranged on the top vertical plate.

[0014] Further, a plurality of anchoring members are arranged uniformly along the longitudinal direction of the concrete beam, and each anchoring member is distributed along the transverse direction of the concrete beam.

[0015] Further, the reinforced concrete layer is filled with geopolymer concrete.

[0016] The application also provides a secondary reinforcement method for reinforcing a reinforced concrete beam with a steel plate without disassembly, which adopts the secondary reinforcement device for reinforcing a reinforced concrete beam with a steel plate without disassembly as described above, and comprises the following steps:

[0017] S1, surface treatment of the existing concrete beam, chiseling and dust removal;

[0018] S2, polishing the existing steel plate to remove surface rust and dust;

[0019] S3, drilling the concrete beam, and after cleaning the hole, the anchor is implanted into the hole by using the anchoring glue, and the connecting steel bars are installed between the anchors and welded and fixed;

[0020] S4, setting a filling mold in the area to be reinforced;

[0021] S5, pouring the geopolymer concrete in the area of the filling mold to the predetermined depth;

[0022] S6, curing to the design strength and removing the mold.

[0023] The above scheme of the present application has the following beneficial effects:

[0024] The secondary reinforcement device and method for the reinforced concrete beam of the reinforced steel plate without disassembly provided by the present application has better overall performance compared to the simple anchoring reinforcement of the existing concrete beam, the flange plate, bottom vertical plate and the like of the anchor can effectively increase and enhance the mechanical bite and action between the concrete layer, significantly improve the anti-peeling capacity of the reinforced concrete layer, and also provide transverse resistance when the concrete beam is resistant to bending, without disassembly of the existing reinforced steel plate, effectively constrain the newly added reinforced concrete layer, improve the bending bearing capacity and stiffness of the concrete beam, and the openings of the flange plate and the bottom vertical plate of the anchor can effectively improve the passability of the geopolymer concrete, obtain a more dense reinforced concrete layer, and avoid local stress concentration caused by the gap between the anchor and the reinforced concrete layer.

[0025] In the present application, the geopolymer concrete is used to replace the traditional concrete for secondary reinforcement of the concrete beam, and due to the good bonding performance of the geopolymer concrete with the existing ordinary concrete beam and steel plate, the geopolymer concrete is directly poured on the steel plate and beam body after surface treatment, which can collaboratively bear stress, avoid disassembly of the steel plate during secondary reinforcement, reduce the construction steps, and improve the construction efficiency, and the reinforced concrete layer of the geopolymer concrete can effectively isolate the corrosion effect of external erosion medium on the steel plate and the anchor, improve the durability of the reinforcement system, and the geopolymer concrete has low carbon emission and strong fire resistance, which can ensure green environmental protection and high temperature resistance during construction;

[0026] Other beneficial effects of the present application will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0028] Figure 2 It is a front view of the overall structure of the present application;

[0029] Figure 3Schematic diagram of anchorage connection details of the present application;

[0030] Figure 4 Schematic diagram of anchorage structure of the present application;

[0031] Figure 5 Flow chart of the method of the present application.

[0032] [BRIEF DESCRIPTION OF DRAWINGS]

[0033] 10 - anchorage; 11 - top vertical plate; 12 - flange plate; 13 - bottom vertical plate; 14 - slot; 15 - welding hole; 20 - connecting steel bar; 30 - reinforced concrete layer; 40 - concrete beam; 50 - steel plate; 60 - bolt. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present application, the technical solutions and advantages clearer, the following will be described in detail with reference to the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. In addition, the technical features involved in the different implementation manners of the present application described below can be combined with each other as long as there is no conflict.

[0035] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a locking connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] As Figures 1-3As shown, the embodiment of the present application provides a secondary reinforcement device for reinforced concrete beam with non-removal reinforcement steel plate, which comprises an anchor 10, a connecting steel bar 20 and a reinforced concrete layer 30, and is used for secondary reinforcement of the primary reinforcement structure such as steel plate 50 and bolt 60 of concrete beam 40. Wherein, the steel plate 50 is attached to the surface of the concrete beam 40, connected and anchored by the bolt 60, forming a primary reinforcement structure.

[0038] Meanwhile, as shown Figure 4 The anchor 10 is provided in a cross shape, comprising a top vertical plate 11, a flange plate 12 and a bottom vertical plate 13. Among them, the top vertical plate 11 is provided with a notch 14, which is used to accommodate the steel plate 50, so that the top vertical plate 11 can be smoothly installed. Of course, after the anchor 10 is installed in place, the notch 14 will not be in direct contact with the steel plate 50, and the preferred distance is about 10mm, and the reinforced concrete layer 30 is also filled between them. Considering the actual situation, there is usually a preset distance between the two steel plates 50, so as a preferred embodiment, three notches 14 are provided on the top vertical plate 11 of the single anchor 10 in this embodiment, the width of the two side notches 14 matches the width of the steel plate 50, and the center notch 14 corresponds to the position between the adjacent two steel plates 50. At the same time, for the top vertical plate 11, the protruding part after being notched is fixedly connected with the concrete beam 40 as an anchor point. It can be understood that the center notch 14 is provided to reduce the size of the anchor point, so as to avoid cracking caused by drilling a hole too wide on the concrete beam 40, and those skilled in the art can flexibly set the notch 14 based on the actual situation to adapt to different number of steel plates 50.

[0039] The flange plate 12 and the bottom vertical plate 13 of the anchor 10 are used to further improve the lateral strength and bending resistance of the anchor 10 and the entire concrete beam 40. It can be understood that under the premise of large notching of the top vertical plate 11 of the anchor 10, the combination of the flange plate 12 and the bottom vertical plate 13 of the anchor 10 can be regarded as a T-shaped beam, and is distributed transversely relative to the concrete beam 40, so as to improve the transverse bending strength of the concrete beam 40.

[0040] As a preferred embodiment, the flange plate 12 and the bottom vertical plate 13 are provided with an opening in this embodiment, and the opening is preferably semicircular. Through the setting of the opening, the flowability of the subsequent reinforced concrete layer 30 is better when filling, so as to avoid the influence of air bubbles on the filling quality. At the same time, through the setting of the opening, the anchor 10 and the reinforced concrete layer 30 are combined more firmly, the anti-peeling performance is better, and the segregation phenomenon of the reinforced concrete layer 30 in the long-term state is avoided.

[0041] As a preferred embodiment, the openings on the flange plate 12 and the bottom vertical plate 13 are arranged in a staggered manner in the embodiment, so as to avoid weakening of the transverse bending and shear resistance of the anchor 10 at the same position, and further improve the reliability of the anchor 10.

[0042] In the embodiment, the connecting steel bars 20 are used to connect the anchors 10 at different positions of the concrete beam 40, so that the anchors 10 are connected as an integrated structure, and the stability of the structure can be ensured when loosening occurs between the anchor 10 and the concrete beam 40 in a long-term state, thereby improving the overall strength and firmness.

[0043] In the embodiment, the anchor 10 is provided with a welding hole 15, which can be in a perforated or non-perforated form, and the connecting steel bar 20 is inserted through or inserted at the end of the welding hole 15, and then welded to connect the connecting steel bar 20 and the anchor 10 as a whole. It should be noted that the connecting steel bars 20 are longitudinally distributed along the concrete beam 40, and the plurality of anchors 10 distributed transversely are connected as a whole. As a preferred embodiment, the welding hole 15 is arranged at the position of the top vertical plate 11 in the embodiment, and the top vertical plate 11 does not participate in the bending strength of the T-shaped beam, so as not to affect the transverse bending performance of the anchor 10.

[0044] It should be noted that the anchor 10 is preferably arranged with a plurality of anchors uniformly along the longitudinal direction of the concrete beam 40, so as to uniformly support the reinforced concrete layer 30, the steel plate 50 and the concrete beam 40. At the same time, since the anchor 10 can cross the steel plate 50, the spacing between the adjacent two anchors 10 can be relatively small, thereby further improving the support strength. Correspondingly, the connecting steel bars 20 can be of the same length specification, and the welding hole 15 can still be connected to all the anchors 10 in sequence by the single-specification connecting steel bar 20 under the condition of no perforation.

[0045] In the embodiment, the reinforced concrete layer 30 is filled with geopolymer concrete (GPC), which has smaller carbon emissions and is more environmentally friendly than ordinary concrete, and has stronger fire resistance, thereby playing a green and environmentally friendly role of high temperature resistance. Through the arrangement of the reinforced concrete layer 30, the once reinforced structure and the anchors 10 and the connecting steel bars 20 can be coated, and the corrosion of the steel structure, especially the steel plate 50, can be better avoided, thereby further improving the reliability of the concrete beam 40 through secondary reinforcement.

[0046] It should be noted that when the reinforced concrete layer 30 is filled, a filling mold with a certain area and depth is first installed, and then the geopolymer concrete is filled into the filling mold, so that the geopolymer concrete is formed and cured until the geopolymer concrete reaches the preset strength, thereby achieving the secondary reinforcement of the concrete beam 40.

[0047] It should be noted that the geopolymer concrete in the embodiment includes the following mixing proportion by weight: the modulus of water glass is 1.2, the concentration of sodium hydroxide is 12 mol / L, the ratio of coal gangue to slag is 6:4, the bone glue ratio is 3.5, the water-binder ratio is 0.38, and the sand ratio is 35%. The preparation of the geopolymer concrete includes: refining the raw materials such as coal gangue, slag, bone glue, etc.; dissolving sodium hydroxide in water and adding water glass to form an alkaline solution; mixing the raw materials with the alkaline solution in a certain proportion to form a castable slurry. Pour the mixed slurry into the filling mold mentioned above, and after proper temperature control and maintenance, the geopolymer concrete will gradually harden to form a solid structure.

[0048] It is worth mentioning that the anchor 10 and the steel plate 50 in the embodiment can be matched, which is easy to standardize production, including the standardization of the size of the notch 14 and the specification of the connecting steel bar 20, so as to facilitate the standardization of installation and improve the installation efficiency and quality.

[0049] Based on the same inventive concept, the embodiment also provides a secondary reinforcement method for a reinforced concrete beam with a reinforced steel plate that can be removed, as shown in Figure 5 The method comprises the following steps:

[0050] S1, the surface of the concrete beam 40 and the steel plate 50 is thoroughly cleaned to remove loose particles, dust, oil stains and other contaminants, and to ensure good adhesion between the subsequent reinforced concrete layer 30 and the concrete beam 40 and the steel plate 50.

[0051] S2, the existing steel plate 50 is polished, the grinding wheel or abrasive belt is gently pressed on the surface of the steel plate 50 with a polishing tool, a certain pressure is maintained, and the polishing is carried out at a uniform speed to avoid high temperature caused by long stay at one place, which may cause deformation or discoloration of the surface of the steel plate 50. After polishing, the surface rust is removed and dusted to ensure a clean surface for subsequent processing.

[0052] It should be noted that the grinding wheel or abrasive belt can be further polished until the desired surface roughness is achieved.

[0053] S3, drill holes at the bottom of the concrete beam 40, remove loose particles in the drill holes, insert the top vertical plate 11 (of the anchor 10) into the drill holes, fix it with the anchoring glue, and then pass the connecting steel bar 20 through the welding hole 15 between the anchors 10 and weld it.

[0054] S4, determine the size, shape and structure of the filling mold, select appropriate mold material, cut the mold material to the required size according to the design drawing, assemble the cut mold into a complete filling mold according to the design requirements, and make preliminary adjustment and fixation.

[0055] It should be noted that during assembly, the levelness and perpendicularity of the formwork should be ensured, and the connection between the formworks should be firm, and appropriate reinforcement treatment can be performed.

[0056] S5, slowly pouring the geopolymer concrete in the mold, ensuring that the geopolymer concrete is dense and reaches the predetermined depth.

[0057] S6, curing the geopolymer concrete and removing the formwork to obtain the reinforced concrete layer 30.

[0058] Specifically, after the geopolymer concrete is poured, appropriate curing is performed to promote it to reach the design strength, and the curing method can include using a curing agent, etc. When the geopolymer concrete reaches the design strength, the formwork is removed, and the operation should be careful to avoid damaging the newly poured geopolymer concrete. According to the specific formula of the geopolymer concrete and the environmental conditions, a suitable curing plan is made to ensure the curing for a period of time to promote the geopolymer concrete to meet the design strength after hardening.

[0059] Compared with the existing concrete beam 40 simply reinforced by the reinforcing bar, the scheme provided by the embodiment has better integrity, the flange plate 12 and the bottom vertical plate 13 of the anchor 10 can effectively increase and enhance the mechanical bite and action between the concrete layer 30, significantly improve the anti-peeling capacity of the reinforced concrete layer 30, and also provide transverse resistance when the concrete beam 40 resists bending, provide effective constraint for the newly added reinforced concrete layer 30 without removing the existing reinforcing steel plate 50, improve the bending bearing capacity and stiffness of the concrete beam 40, and the openings of the flange plate 12 and the bottom vertical plate 13 of the anchor 10 can effectively improve the passability of the geopolymer concrete, obtain a more dense reinforced concrete layer 30, and avoid local stress concentration caused by the gap between the anchor 10 and the reinforced concrete layer 30.

[0060] In addition, the geopolymer concrete is used instead of traditional concrete to perform secondary reinforcement on the concrete beam 40, and since the geopolymer concrete has good bonding performance with the existing ordinary concrete beam 40 and the steel plate 50, the geopolymer concrete is directly poured on the steel plate 50 and the beam body after surface treatment, which can collaboratively bear stress and avoid removing the steel plate 50 during secondary reinforcement, reduce the construction steps, and improve the construction efficiency. The reinforced concrete layer 30 of the geopolymer concrete can effectively isolate the corrosion effect of external corrosive media on the steel plate 50 and the anchor 10, improve the durability of the reinforcement system, and the geopolymer concrete has low carbon emission and strong fire resistance, which can ensure green environmental protection and high temperature resistance during construction.

[0061] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, any combination of these technical features is considered to be within the scope of the present disclosure.

[0062] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A secondary reinforcement device for a reinforced concrete beam with a reinforced steel plate that does not require removal, characterized in that, The application relates to a concrete beam reinforcing structure, which comprises anchor pieces, connecting steel bars and a reinforced concrete layer, and is characterized in that the steel plates are adhered to the surface of the concrete beam, are connected by bolts and are anchored. The anchor pieces are connected with the concrete beam and are arranged below the steel plates, the anchor pieces are connected as a whole by the connecting steel bars, and the reinforced concrete layer is filled in the region where the anchor pieces, the connecting steel bars and the steel plates are located. The anchor piece comprises a top vertical plate, a flange plate and a bottom vertical plate; the top vertical plate is provided with notches for accommodating the steel plates, and the notches have gaps with the steel plates after the anchor piece is installed in place; the flange plate is horizontally arranged, and the bottom vertical plate is arranged below the top vertical plate. A plurality of notches are arranged on the top vertical plate of a single anchor piece, and the protruding part of the top vertical plate after being notched is an anchoring point connected with the concrete beam. The flange plate and the bottom vertical plate are both provided with openings for improving the flowability of the reinforced concrete layer during filling and improving the combination with the reinforced concrete layer. The openings on the flange plate and the bottom vertical plate are arranged in a staggered manner. The anchor piece is provided with welding holes which are connected with the connecting steel bars and are fixed by welding. The welding holes are arranged on the top vertical plate.

2. The secondary reinforcement device for reinforced concrete beams with non-removable reinforced steel plates according to claim 1, characterized in that, A plurality of anchor pieces are uniformly arranged along the longitudinal direction of the concrete beam, and each anchor piece is distributed along the transverse direction of the concrete beam.

3. The secondary reinforcement device for reinforced concrete beams with non-removable reinforced steel plates according to claim 1, characterized in that, The reinforced concrete layer is filled with geopolymer concrete.

4. A secondary reinforcement method of reinforced concrete beams with non-removable reinforcement plates, using a secondary reinforcement device of reinforced concrete beams with non-removable reinforcement plates according to any one of claims 1 to 3, characterized in that, The application comprises the following steps: S1, surface treatment of the existing concrete beam, chiseling and dust removal; S2, polishing treatment of the existing steel plate, removal of surface rust and dust removal; S3, drilling of the concrete beam, cleaning of the drilled hole, implantation of the anchor piece into the hole by using implanting glue, installation of the connecting steel bars between the anchor pieces and welding fixation; S4, setting of a filling mold in the region to be reinforced; S5, pouring of geopolymer concrete in the region of the filling mold until a predetermined depth; S6, curing until the design strength and then removing the mold.

Images