Planar beam body anchoring system and anchoring construction method

Abstract

The application provides a planar beam body anchoring system and a construction method thereof. The anchoring system comprises a steel wire mesh and a tensioning device. The steel wire mesh is attached to a beam body reinforcing surface. Two ends of the steel wire mesh are a fixed end and a tensioning end, or both ends of the steel wire mesh are tensioning ends. The fixed end is fixedly connected to the beam body reinforcing surface through a bonding material. The tensioning device is detachably connected to the beam body reinforcing surface. A tensioning output end of the tensioning device is fixedly connected to the tensioning end of the steel wire mesh, and is used for applying a tensioning prestress to the steel wire mesh. The steel wire mesh is fixedly connected to the beam body reinforcing surface through a bonding material layer. The planar beam body anchoring system and the construction method thereof can improve the deflection load of the planar beam body, avoid cracking and damage of the planar beam body, promote crack closure of the cracked planar beam body, prolong the safe service life of the planar beam body, and improve the reinforcing effect.

Description

Technical Field

[0001] This invention belongs to the field of building reinforcement technology, specifically relating to a planar beam anchoring system and anchoring construction method. Background Technology

[0002] The emergence of reinforced concrete structures has accelerated the process of global civilization and urbanization. However, due to the age of the building or other reasons, it is not uncommon for reinforced concrete buildings to experience a decline in load-bearing capacity and structural strength, as well as cracking and damage. In response to these situations, it is necessary to use tensioning and anchoring methods to reinforce the building, thereby extending its normal service life.

[0003] High-strength steel wire mesh is a material made of high-modulus steel wire with a tensile strength six to nine times higher than that of ordinary steel, bonded to fiberglass mesh. It combines the advantages of traditional steel and carbon fiber composites. Compared with traditional steel, it has superior corrosion resistance and durability, outstanding aging resistance, and strength similar to carbon fiber composites. Its mechanical properties and shear strength are superior to those of carbon fiber composites, and it has higher compatibility with bonding materials. Currently, high-strength steel wire mesh is usually used for passive reinforcement of buildings only in conjunction with bonding materials. It only plays a passive protective role when the building is damaged and the cracks appear or existing cracks widen. Its high modulus and high strength characteristics are not fully utilized. Therefore, in most cases, the reinforcement effect does not meet expectations. Summary of the Invention

[0004] This invention provides a planar beam anchoring system and anchoring construction method, aiming to fully utilize the high modulus and high strength characteristics of high-strength steel wire mesh to improve the reinforcement effect of buildings.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: Firstly, a planar beam anchoring system is provided, comprising a steel wire mesh and a tensioning device; the steel wire mesh is attached to the beam reinforcement surface, with both ends of the steel wire mesh being a fixed end and a tensioning end, or both ends of the steel wire mesh being tensioning ends, wherein the fixed end is bonded to the beam reinforcement surface by an adhesive material; the tensioning device is detachably connected to the beam reinforcement surface, and the tensioning output end is fixedly connected to the tensioning end of the steel wire mesh, for applying tension prestress to the steel wire mesh; wherein the steel wire mesh maintains the tension prestress and is bonded to the beam reinforcement surface by an adhesive material layer.

[0006] In conjunction with the first aspect, in one possible implementation, the tensioning device includes:

[0007] The tensioning support is detachably connected to the reinforcement surface of the beam. Two tensioning rods are slidably inserted on the tensioning support along the extension direction of the steel wire mesh, and the two tensioning rods are symmetrically distributed on both sides of the steel wire mesh.

[0008] The tensioning anchor is connected to two tensioning bolts at both ends. The tensioning anchor is used to anchor and fix the tensioning end of the steel wire mesh cloth.

[0009] The tensioning baffle and the tensioning anchor are located on both sides of the tensioning support, and the two ends of the tensioning baffle are connected to the ends of the two tensioning bolts away from the tensioning anchor, respectively.

[0010] The tensioning drive unit is located on the symmetrical axis of the two tensioning screws. One end of the tensioning drive unit is connected to the tensioning support, and the other end is connected to the tensioning baffle. It is used to push the tensioning baffle and drive the tensioning anchor to apply tensioning prestress to the steel wire mesh through the tensioning screws.

[0011] In some embodiments, the tensioning anchor includes:

[0012] The load-bearing shaft is detachably connected to two tensioning screws at both ends;

[0013] An anchoring cylinder, coaxially ringed on the bearing shaft and located between two tensioning bolts, has slits on its wall suitable for the tensioning end of the steel wire mesh to pass through;

[0014] The anchoring cylinder is filled with grout, and the tensioned end of the steel wire mesh cloth that passes through the anchoring cylinder is connected to the anchoring cylinder as a whole after the grout has solidified.

[0015] For example, the cross-section of the load-bearing shaft is a regular polygon, and a sleeve matching its shape is fitted on the load-bearing shaft. An anchoring space is formed between the outer wall of the sleeve and the inner wall of the anchoring cylinder. A spiral guide sleeve is provided in the anchoring space. The tensioned end of the steel wire mesh cloth is inserted into the spiral layer gap of the spiral guide sleeve to form a spiral shape, and grout is injected into the spiral layer gap.

[0016] In conjunction with the first aspect, in one possible implementation, the tensioning device further includes two guide rails, with the two ends of the tensioning anchor slidably connected to the two guide rails respectively.

[0017] In some embodiments, the tensioning anchor includes:

[0018] The base is slidably connected to two guide rails at both ends, and is detachably connected to two tensioning screws at both ends. The base is provided with anchor grooves, and the bottom of the anchor grooves is a continuous curved surface.

[0019] The pressure cap is placed on the anchor groove and is detachably connected to the base. The pressure cap is provided with a block that matches the shape of the anchor groove. The block is embedded in the anchor groove and cooperates with the bottom of the anchor groove to clamp the tension end of the steel wire mesh cloth.

[0020] The base has a limiting groove on the wall facing the beam reinforcement surface, and the anchor groove has a through groove on the side edge near the tension support that penetrates the limiting groove; the tensioning end of the steel wire mesh passes through the limiting groove and the through groove in sequence and then bends in the opposite direction to extend into the anchor groove.

[0021] The beneficial effects of the planar beam anchoring system provided by this invention are as follows: Compared with the prior art, in this planar beam anchoring system, the steel wire mesh is attached to the beam reinforcement surface and tensioned at one or both ends by a tensioning device, maintaining it in a prestressed state. It is then anchored to the beam reinforcement surface by a cured bonding material layer. Since the bonding material layer can hold each bundle of steel wires in the steel wire mesh before curing, the steel wire mesh can maintain the tensile stress on the planar beam after curing and become integrated with the beam reinforcement surface to share the load. This fully utilizes the high modulus and high strength characteristics of the steel wire mesh to achieve active reinforcement of the planar beam. Compared with passive reinforcement, this not only increases the deflection load of the planar beam and prevents cracking and damage, but also promotes the closure of cracks in the planar beam, extends the safe service life of the planar beam, and greatly improves the reinforcement effect of the planar beam.

[0022] Secondly, embodiments of the present invention also provide a construction method for the above-mentioned planar beam anchorage system, comprising the following steps:

[0023] Lay out the anchor bolt positions according to the width and length of the wire mesh after stretching, and mark the anchor bolt hole positions.

[0024] The layout and positioning area of ​​the beam reinforcement surface is roughened. If the steel wire mesh is tensioned at one end, the fixed end of the steel wire mesh is bonded to one end of the layout and positioning area with adhesive material and the adhesive material is allowed to cure.

[0025] Tensioning devices are installed based on anchor bolt holes. The tensioning devices are the same as those used in the above-mentioned planar beam anchoring system. If the steel wire mesh is tensioned and anchored at one end, one tensioning device is used to anchor to the tensioning end of the steel wire mesh. If the steel wire mesh is tensioned at both ends, two tensioning devices are used to anchor to both ends of the steel wire mesh respectively.

[0026] Apply an adhesive layer to the layout and positioning area, and then tension the steel wire mesh cloth using a tensioning device so that the steel wire side of the steel wire mesh cloth is embedded into the adhesive layer facing the beam reinforcement surface.

[0027] After leveling and compacting the surface of the bonding material layer, maintain the tensioning prestress of the tensioning device on the steel wire mesh until the bonding material layer cures; if the thickness of the bonding material layer does not meet the design thickness requirements, apply a second layer of bonding material and wait for it to cure.

[0028] Cut the wire mesh at the anchoring point between the tensioning device and the wire mesh, then remove the tensioning device and cut off the exposed portion of the anchor bolts inserted in the anchor bolt holes.

[0029] In conjunction with the second aspect, in one possible implementation, the anchoring of the tensioning device to the tensioning end of the wire mesh fabric includes the following steps:

[0030] The tensioned end of the steel wire mesh is sealed and steel strips are bonded along its edge, with both ends of the steel strips extending to the outer side of the width direction of the steel wire mesh.

[0031] The tensioned end of the steel wire mesh is inserted into the anchoring cylinder through the seam and rolled into a spiral shape under the guidance of the spiral guide sleeve. Then, the protruding part of the steel strip is cut off along the side of the steel wire mesh.

[0032] Seal the joint and one end of the anchoring cylinder, and then inject grout into the anchoring cylinder to fill the gaps inside the anchoring cylinder and the gaps between the spiral layers of the spiral guide sleeve.

[0033] Wait for the grout to cure so that the tensioned end of the steel wire mesh is connected to the anchoring cylinder.

[0034] In conjunction with the second aspect, in one possible implementation, the anchoring of the tensioning device to the tensioning end of the wire mesh fabric includes the following steps:

[0035] The tensioned end of the steel wire mesh is passed through the limiting groove opened on the wall of the base facing the beam reinforcement surface and the through groove inside the base in sequence, and then bent in the opposite direction. The bent part is then embedded into the anchoring groove opened on the wall of the base away from the beam reinforcement surface.

[0036] The pressure cap is screwed onto the base with fasteners, so that the insert on the pressure cap is embedded in the anchor groove to press the tension end of the steel wire mesh.

[0037] The steel wire mesh is pre-tensioned and pressure is maintained by a tensioning device, and the fasteners are tightened again after the pressure is maintained.

[0038] In some embodiments, if the steel wire mesh is tensioned at one end, a wedge groove is opened at one end of the layout and positioning area, and the fixed end of the steel wire mesh is embedded in the wedge groove. Then, the wedge groove is filled with adhesive material and the adhesive material is allowed to cure, thereby completing the anchoring of the fixed end of the steel wire mesh.

[0039] The tensioning direction of the tensioning device has a first included angle with the beam reinforcement surface, and the vertical distance between the tensioning end of the tensioning device and the beam reinforcement surface gradually decreases during the tensioning process; when the steel wire mesh is tensioned at one end, the bottom of the wedge groove has a second included angle with the beam reinforcement surface, and the wedge groove gradually deepens in the direction away from the tensioning device, and the fixed end of the steel wire mesh is in contact with the bottom of the wedge groove; the first included angle is equal to the second included angle, which is equal to 1° to 5°;

[0040] If the steel wire mesh is tensioned at both ends, then the tensioning directions of the two tensioning devices have a first included angle with the beam reinforcement surface.

[0041] The beneficial effects of the construction method of the planar beam anchoring system provided by the present invention are as follows: Compared with the prior art, the construction method of the planar beam anchoring system of the present invention applies pretension to the steel wire mesh cloth before the bonding material layer is cured by the tensioning device. This allows the steel wire mesh cloth to maintain the tensile stress on the planar beam after the bonding material layer is cured, and to be integrated with the beam reinforcement surface to share the load. This fully utilizes the high modulus and high strength characteristics of the steel wire mesh cloth to achieve active reinforcement of the planar beam. It can not only increase the deflection load of the planar beam and prevent the planar beam from cracking and breaking, but also promote the closure of cracks in the planar beam, extend the safe service life of the screen beam, and greatly improve the reinforcement effect of the planar beam. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the planar beam anchorage system provided in the first embodiment of the present invention;

[0043] Figure 2 for Figure 1 A three-dimensional structural diagram of the tensioning device used in the planar beam anchorage system shown;

[0044] Figure 3 for Figure 2 The diagram shows the structure of the tensioning anchor (without anchored steel wire mesh) used in the tensioning device.

[0045] Figure 4 for Figure 2 The diagram shows the structure of the tensioning anchor (with steel wire mesh already anchored) used in the tensioning device.

[0046] Figure 5 This is a structural schematic diagram of the planar beam anchorage system provided in the second embodiment of the present invention;

[0047] Figure 6 for Figure 5 A three-dimensional structural diagram of the tensioning device used in the planar beam anchorage system shown;

[0048] Figure 7 for Figure 6 The diagram shows the structure of the tensioning anchor used in the tensioning device.

[0049] Figure 8 for Figure 7 The exploded structural diagram of the tensioning anchor shown;

[0050] Figure 9This is a three-dimensional structural diagram of the guide rail used in an embodiment of the present invention.

[0051] In the diagram: 10. Steel wire mesh; 11. Steel bar; 20. Planar beam; 21. Beam reinforcement surface; 30. Bonding material layer; 40. Tensioning device; 41. Tensioning support; 411. Tensioning bolt; 42. Tensioning anchor; 421. Bearing shaft; 422. Anchoring cylinder; 4221. Joint; 423. Grout; 424. Sleeve; 425. Spiral guide sleeve; 426. Partition plate; 427. Base; 4271. Anchor groove; 4272. Limiting groove; 4273. Through groove; 4274. Guide part; 4275. Guide protrusion; 428. Pressure cap; 4281. Insert; 43. Tensioning baffle; 44. Tensioning drive component; 45. Guide rail; 451. Pressing part; 452. Guide groove. Detailed Implementation

[0052] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0053] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of the invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] Please refer to the following: Figures 1 to 9 The planar beam anchoring system provided by the present invention will now be described. The planar beam anchoring system includes a steel wire mesh 10 and a tensioning device 40. The steel wire mesh 10 is attached to the beam reinforcement surface 21, with both ends of the steel wire mesh 10 being a fixed end and a tensioning end, or both ends of the steel wire mesh 10 being tensioning ends. The fixed end is cured and bonded to the beam reinforcement surface 21 through an adhesive layer 30. The tensioning device 40 is detachably connected to the beam reinforcement surface 21, and its tension output end is fixedly connected to the tensioning end of the steel wire mesh 10, for applying tension prestress to the steel wire mesh 10. The steel wire mesh 10 maintains the tension prestress and is cured and bonded to the beam reinforcement surface 21 as a single unit through the adhesive layer 30.

[0055] It should be understood that, in this embodiment, the bonding material can preferably be concrete mortar or epoxy resin structural adhesive. During the process of applying tensile load to the steel wire mesh 10 before the bonding material layer 30 is cured, it can be embedded in the bonding material layer 30. By utilizing the cohesive effect before the bonding material is cured, each bundle of steel wires of the steel wire mesh 10 can be fully wrapped by the bonding material, and after the bonding material layer 30 is cured on the beam reinforcement surface 21, it forms an integral structure.

[0056] It is important to note that the area to be reinforced on the beam reinforcement surface 21 should be roughened beforehand, such as by chiseling or grinding, to ensure that the bonding material layer 30 can reliably connect with the area to be reinforced after curing. Compared with fiber composite materials, which can only be fixed to the surface of the beam reinforcement surface 21 by chemical adhesives, the steel wire mesh 10 is wrapped in the bonding material layer 30 and is integrated to bear the force. This not only allows the tension prestress of the steel wire mesh 10 to be directly transferred to the planar beam 20, improving the tension force transmission efficiency, but also avoids the steel wire mesh 10 from being exposed, improving the concealment of the reinforcement.

[0057] Compared with the prior art, the planar beam anchoring system provided in this embodiment uses a steel wire mesh 10 attached to the beam reinforcement surface 21 and tensioned at one end or both ends by a tensioning device 40. This keeps the mesh under prestressed tension and anchors it to the beam reinforcement surface 21 through a cured adhesive layer 30. Since the adhesive layer 30 can hold each bundle of steel wires in the steel wire mesh 10 before curing, it maintains the tensile stress on the planar beam 20 after curing and integrates with the beam reinforcement surface 21 to share the load. This fully utilizes the high modulus and high strength characteristics of the steel wire mesh 10 to actively reinforce the planar beam 20. Compared with passive reinforcement, this not only increases the deflection load of the planar beam 20 and prevents cracking and damage, but also promotes the closure of cracks in the already broken planar beam 20, extending its safe service life and greatly improving the reinforcement effect.

[0058] Specifically, in this embodiment, see Figure 2 and Figure 6 The tensioning device 40 includes a tensioning support 41, a tensioning anchor 42, a tensioning baffle 43, and a tensioning drive component 44.

[0059] Tensioning support 41 is detachably connected to the beam reinforcement surface 21. Two tensioning rods 411 are slidably threaded through the tensioning support 41 along the extension direction of the wire mesh 10, and the two tensioning rods 411 are symmetrically distributed on both sides of the wire mesh 10. The two ends of the tensioning anchor 42 are respectively connected to the two tensioning rods 411, and the tensioning anchor 42 is used to anchor and fix the tensioning end of the wire mesh 10. The tensioning baffle 43 and the tensioning anchor 42 are respectively located at On both sides of the tension support 41, the two ends of the tension baffle 43 are respectively connected to the ends of the two tension screws 411 away from the tension anchor 42; the tension drive 44 is located on the axis of symmetry of the two tension screws 411, one end of the tension drive 44 is connected to the tension support 41, and the other end is connected to the tension baffle 43, which is used to push the tension baffle 43 and drive the tension anchor 42 to apply tension prestress to the steel wire mesh 10 through the tension screws 411.

[0060] The tensioning support 41 can be fixedly connected to the beam reinforcement surface 21 by anchor bolts. Specifically, the tensioning support 41 can be directly attached and fixed to the beam reinforcement surface 21, or it can be attached and fixed to the side wall of the planar beam 20 (i.e., the adjacent wall of the beam reinforcement surface 21; if double-end tensioning is used, the two tensioning supports 41 are respectively attached to the two opposite side walls of the planar beam 20). This allows the side wall of the planar beam 20 to be used to improve the load-bearing capacity of the tensioning support 41 in the tensioning direction, avoid the tensioning support 41 from being misaligned or deflected due to the tensioning load, and thus improve the tensioning stability and tensioning force balance.

[0061] The tensioning drive component 44 needs to output sufficient tension force. Specifically, a hydraulic jack can be used as the tensioning drive component 44. The two tensioning screws 411 are used to transfer the pushing force applied by the tensioning drive component 44 to the tensioning baffle 43 to the tensioning anchor 42, thereby driving the tensioning anchor 42 to apply tension force to the wire mesh fabric 10. Since the two tensioning screws 411 are symmetrically distributed with respect to the wire mesh fabric 10, and the tensioning drive component 44 is located on the axis of symmetry of the two tensioning screws 411, which is also the center line of the wire mesh fabric 10, it can be ensured that the tensioning anchor 42 is subjected to balanced force at both ends, ensuring that the wire mesh fabric 10 maintains an overall coordinated force state in the width direction, so that the high modulus and high strength characteristics of the wire mesh fabric 10 are fully released, thereby improving the tensioning reinforcement effect.

[0062] As one embodiment of the aforementioned tensioning anchor 42, please refer to Figures 2 to 4The tensioning anchor 42 includes a load-bearing shaft 421 and an anchoring cylinder 422. The two ends of the load-bearing shaft 421 are detachably connected to two tensioning screws 411 respectively. The anchoring cylinder 422 is coaxially sleeved on the load-bearing shaft 421 and located between the two tensioning screws 411. The cylinder wall of the anchoring cylinder 422 is provided with a slit 4221 suitable for the tensioning end of the steel wire mesh cloth 10 to pass through. The anchoring cylinder 422 is filled with grout 423. After the tensioning end of the steel wire mesh cloth 10 passes through the anchoring cylinder 422, it is connected to the anchoring cylinder 422 as a whole after the grout 423 is cured.

[0063] The bearing shaft 421 has through holes at both ends, through which the tensioning screw 411 can pass. After the tensioning screw 411 passes through the through holes, nuts are screwed onto both sides of the bearing shaft 421. This not only connects the bearing shaft 421 and the tensioning screw 411, but also allows the relative position of the tensioning screw 411 and the end of the bearing shaft 421 to be adjusted by adjusting the nuts. This ensures that the bearing shaft 421 is parallel to the tensioning baffle 43, thereby meeting the requirement of balanced force at both ends.

[0064] After the tensioned end of the steel wire mesh 10 passes through the joint 4221 and extends into the anchoring cylinder 422, it can bend and roll onto the bearing shaft 421 under the guidance of the inner wall of the anchoring cylinder 422, utilizing the toughness of the steel wire mesh 10. Then, grout 423 is injected into the anchoring cylinder 422. The fluidity of the grout 423 ensures that it can fill the internal space of the anchoring cylinder 422. After the grout 423 is cured, the tensioned end of the steel wire mesh 10 that extends into the anchoring cylinder is fixed together with the anchoring cylinder 422 and the bearing shaft 421, thereby realizing the anchoring of the tensioned end of the steel wire mesh 10. The bending state of the steel wire mesh 10 combined with the curing connection of the grout 423 improves the reliability of the anchoring.

[0065] Specifically, in this embodiment, the cross-section of the bearing shaft 421 is a regular polygon, and a sleeve 424 matching its shape is fitted on the bearing shaft 421. An anchoring space is formed between the outer wall of the sleeve 424 and the inner wall of the anchoring cylinder 422. A spiral guide sleeve 425 is provided in the anchoring space. The tensioned end of the steel wire mesh cloth 10 is inserted into the spiral layer gap of the spiral guide sleeve 425 to form a spiral shape, and grout 423 is injected into the spiral layer gap.

[0066] By setting a sleeve 424 on the load-bearing shaft 421, the grout 423 and the sleeve 424 can be solidified and connected as one unit, and the load-bearing shaft 421 can be pulled out from the sleeve 424. This allows the load-bearing shaft 421 to be easily removed and reused after the tensioning construction is completed. Since the load-bearing shaft 421 and the sleeve 424 adopt a regular polygonal through-sleeve connection structure, tensioning failure caused by relative rotation between the sleeve 424 and the load-bearing shaft 421 during the tensioning process can be avoided, thus ensuring tensioning stability and safety.

[0067] It should be understood that the larger the bending angle of the wire mesh 10 within the anchoring cylinder 422, the more reliable the anchoring of the tensioned end of the wire mesh 10. Since the wire mesh 10 tends to bend and adhere to the shape of the bearing shaft 421 after extending into the anchoring cylinder 422, the cross-sectional shape of the bearing shaft 421 needs to be selected according to the actual tension value. Specifically, the higher the tension value, the higher the tensile strength requirement for the wire mesh 10. Therefore, when the tension value is high, a square bearing shaft 421 can be used to ensure the wire mesh 10... The bending angle of the steel wire mesh 10 within the anchoring cylinder 422 can reach 90 degrees. If the tension value is low, a regular hexagonal bearing shaft 421 can be used to make the maximum bending angle of the steel wire mesh 10 within the anchoring cylinder 422 60 degrees. Of course, since there will be a certain loss of tensile strength in the bending state of the steel wire mesh 10, it should be ensured that the residual tensile strength of the steel wire mesh 10 after bending is more than 1.3 times higher than the required tension value during anchoring to avoid tension breakage and ensure the safety of tensioning construction and the reliability of tensioning anchoring.

[0068] Based on the above, since the steel wire mesh 10 is directly inserted into the anchoring cylinder 422, the steel wire mesh 10 can only be bent into a single-layer ring within the anchoring cylinder 422. If the tension value is high, the steel wire mesh 10 still has the risk of being pulled out from the anchoring cylinder 422. Therefore, a spiral guide sleeve 425 is set inside the anchoring cylinder 422, i.e., within the anchoring space. The spiral layer gap of the spiral guide sleeve 425 can be used to guide the steel wire mesh 10 to be wound into a multi-layer spiral shape within the anchoring cylinder 422. The more spiral layers there are, the stronger the anchoring reliability, thereby improving the anchoring reliability.

[0069] Specifically, when the tension value is ≤500MPa, there is no need to set the spiral guide sleeve 425. The tensioning end of the steel wire mesh cloth 10 can be directly inserted into the anchoring cylinder 422 and the grout 423 can be injected and cured to meet the requirements. At this time, the grout 423 injected is preferably a high-toughness epoxy resin that is cured by E51 or E44 epoxy resin with aliphatic amine and active diluent (mixed according to the ratio of epoxy functional groups contained in the former to active hydrogen contained in the latter in a 1:1 ratio).

[0070] When the tensile force is 500-1000 MPa, there are three spiral layers. The gaps between the inner two spiral layers are filled with high-modulus, high-strength epoxy resin, which is made by mixing AG-80 or AFG-90 multifunctional epoxy resin with an anhydride curing agent (mixed in a 1:1 ratio of epoxy functional groups in the former to active hydrogen in the latter). The gaps between the outer spiral layers are filled with the above-mentioned high-toughness epoxy resin and cured.

[0071] When the tensile force is ≥1000MPa, an additional spiral layer is added for every 200MPa increase. Similarly, the gap between the two inner spiral layers is filled with the above-mentioned high modulus and high strength epoxy resin for curing and connection; the gap between the outer spiral layers is filled with the above-mentioned high toughness epoxy resin for curing and connection.

[0072] When the tension value is ≥2000MPa, the tensioning end of the steel wire mesh 10 is pressed with the steel plate (i.e., the spiral guide sleeve 425 in the flattened state) to form a mechanical engagement state, so that at least part of the steel wires of the steel wire mesh are embedded in the steel plate. Then, the two are bent together into a spiral structure. This structure can directly replace the anchor cylinder 422 and be connected by injecting grout 423 into the gap between the spiral layers. Alternatively, it can be bent into a spiral shape and then inserted into the anchor cylinder 422 and connected by injecting grout 423 to form a whole. Of course, in this case, to facilitate installation into the anchoring cylinder 422, one end of the seam 4221 of the anchoring cylinder 422 can be extended to the end of the anchoring cylinder 422, so that the entire end of the anchoring cylinder 422 can be installed. Since the steel wire mesh cloth 10 and the spiral wall surface of the spiral guide sleeve 425 are interlocked to form a mechanical meshing structure, the steel wire mesh cloth 10 can be prevented from sliding relative to the spiral guide sleeve 425, so that the integrity is better and the tensile strength is higher under the bonding effect of the cured slurry 423.

[0073] In addition to the above, when the number of layers of the spiral guide sleeve 425 is ≥3, since the grout 423 injected into the gap between the inner two spiral layers is different from that injected into the gap between the remaining outer spiral layers, in order to avoid the two grouts 423 from intermingling and affecting performance, a partition 426 can be set between the high modulus, high strength epoxy resin and the high toughness epoxy resin. The partition 426 is made of rubber material. After the tension end of the steel wire mesh cloth 10 is bent and attached to the spiral wall surface of the spiral guide sleeve 425, the partition 426 is heated to form a viscous flow state on both sides before being inserted into the corresponding position of the spiral guide sleeve 425. This makes the partition 426 and the spiral guide sleeve 425 seal and bond together, dividing the spiral layer gap into two injection chambers, so that the two grouts 423 can be injected at the same time, improving the anchoring efficiency.

[0074] The purpose of using different grout 423 is that the two layers of high-modulus, high-strength epoxy resin inside can improve the anchoring strength of the steel wire mesh 10 at the very end and prevent pull-out. The high-toughness epoxy resin outside can undergo tension deformation together with the steel wire mesh 10 during the tensioning process. On the one hand, it can prevent the connection between the epoxy resin and the steel wire mesh 10 from cracking. On the other hand, it can avoid the problem of stress concentration at the anchoring end of the steel wire mesh 10 during the tensioning process, so that the tension stress borne by the tensioning end can be smoothly transferred to the entire spiral part, thereby promoting synergistic tensioning and improving tension strength and construction safety.

[0075] Among some possible implementations, such as Figure 6 As shown, the tensioning device 40 also includes two guide rails 45, and the two ends of the tensioning anchor 42 are slidably connected to the two guide rails 45 respectively. By setting the guide rails 45 to guide the tensioning anchor 42 to maintain linear movement during the tensioning process, it is ensured that both sides of the steel wire mesh 10 are subjected to force in a coordinated manner, giving full play to the high modulus and high strength characteristics of the steel wire mesh 10, avoiding tensioning failure due to force imbalance, and improving the quality of tensioning and anchoring.

[0076] As another embodiment of the aforementioned tensioning anchor 42, please refer to... Figures 6 to 9 The tensioning anchor 42 includes a base 427 and a pressure cap 428. The two ends of the base 427 are slidably connected to two guide rails 45, and the two ends are detachably connected to two tensioning screws 411. The base 427 is provided with an anchor groove 4271, and the bottom of the anchor groove 4271 is a continuous curved surface. The pressure cap 428 is placed on the anchor groove 4271 and is detachably connected to the base 427. The pressure cap 428 is provided with an insert 4281 that matches the shape of the anchor groove 4271. The insert 4281 is embedded in the anchor groove 4271 and cooperates with the bottom of the anchor groove 4271 to clamp the tensioning end of the steel wire mesh cloth 10.

[0077] The tensioned end of the steel wire mesh cloth 10 is directly pressed into the anchoring groove by the insert 4281 on the pressure cap 428, thus achieving the anchoring and fixing of the tensioned end. The operation is simple and efficient. Specifically, the pressure cap 428 and the base 427 can be detachably connected by multiple bolts. The higher the bolt tightening torque, the higher the connection strength between the pressure cap 428 and the base 427. At the same time, the greater the clamping force of the insert 4281 and the bottom of the anchoring groove on the tensioned end of the steel wire mesh cloth 10, the higher the anchoring reliability.

[0078] It should be noted that guide portions 4274 are provided at both ends of the base 427, and pressing portions 451 suitable for pressing against the guide portions 4274 are provided on the side walls of the two guide rails 45 that are close to each other; wherein, one of the guide portions 4274 and the pressing portions 451 is provided with a guide groove 452, and the other is provided with a guide protrusion 4275. The guide protrusion 4275 and the guide groove 452 both extend along the tensioning direction and are correspondingly fitted together.

[0079] The interlocking of the guide groove 452 and the guide protrusion 4275 can prevent the base 427 from deflecting or misaligning on the guide rail 45, improve the consistency of movement at both ends of the base 427, thereby improving the force balance at both ends of the steel wire mesh 10. Moreover, the pressing part 451 can press the base 427 against the surface to be reinforced, ensuring the reliability of the connection between the base 427 and the guide rail 45. The base 427 can directly slide the guide part 4274 from the end of the guide rail 45 between the pressing part 451 of the two guide rails 45 and the beam reinforcement surface 21. Therefore, the disassembly and assembly are convenient and labor-saving, which helps to improve construction efficiency.

[0080] Furthermore, in this embodiment, the base 427 is provided with a limiting groove 4272 on the wall surface facing the beam reinforcement surface 21, and the anchor groove 4271 is provided with a through groove 4273 that penetrates the limiting groove 4272 on one side edge near the tension support 41; the tensioning end of the steel wire mesh cloth 10 passes through the limiting groove 4272 and the through groove 4273 in sequence and then bends in the opposite direction to extend into the anchor groove 4271.

[0081] The tensioned end of the steel wire mesh 10 passes through the limiting groove 4272 and the through groove 4273 in sequence, and then bends in the opposite direction to extend into the anchoring groove. Then, the insert 4281 clamps the reverse-bent part with the bottom of the anchoring groove, thereby forming a U-shaped anchoring structure at the tensioned end of the steel wire mesh 10. Moreover, by setting the bottom of the anchoring groove 4271 as a continuous curved surface structure, the clamping area of ​​the steel wire mesh 10 can be increased, thereby improving the anchoring tensile strength. At the same time, the limiting groove 4272 can press the steel wire mesh 10 against and attach it to the beam reinforcement surface 21, thereby avoiding excessive gap between the steel wire mesh 10 and the surface to be reinforced, which would affect the anchoring quality.

[0082] Optionally, such as Figure 7 As shown, in this embodiment, the bottom of the anchoring groove is formed by connecting multiple continuous arc surfaces or a wavy curved surface, and the angle between the edge of the bottom of the anchoring groove and the side wall of the through groove 4273 is equal to or greater than 90 degrees. On the one hand, this can increase the clamping area of ​​the steel wire mesh 10; on the other hand, the curved surface structure has higher tensile strength than the direct clamping method on a flat surface, thereby improving the anchoring reliability of the tension end of the steel wire mesh 10, meeting the high-strength tension requirements of the steel wire mesh 10, and avoiding the formation of sharp angles when the steel wire mesh 10 bends into the anchoring groove, thereby avoiding the steel wire mesh 10 bearing shear stress, reducing the loss of tensile strength of the steel wire mesh 10, and thus meeting the high-strength tension stress requirements.

[0083] Based on the same inventive concept, please combine Figures 1 to 9 It is understood that this application also provides a construction method for the above-mentioned planar beam anchorage system, including the following steps:

[0084] S100. Lay out and position the anchor bolt holes according to the width and length of the steel wire mesh 10 after stretching.

[0085] S200. Roughen the layout and positioning area of ​​the beam reinforcement surface 21. Specifically, it can be roughened by chiseling or grinding. If the steel wire mesh 10 is tensioned at one end, then the fixed end of the steel wire mesh 10 is bonded to one end of the layout and positioning area by adhesive material and wait for the adhesive material to cure.

[0086] S300. Tensioning device 40 is installed based on anchor bolt hole positions. Tensioning device 40 is the tensioning device 40 used in the above-mentioned planar beam anchoring system. If the steel wire mesh 10 is single-end tensioned and anchored, one tensioning device 40 is used to anchor to the tensioning end of the steel wire mesh 10. If the steel wire mesh 10 is double-end tensioned, two tensioning devices 40 are used to anchor to both ends of the steel wire mesh 10 respectively.

[0087] S400. Apply adhesive material layer 30 to the layout and positioning area, and then tension the steel wire mesh 10 through the tensioning device 40 so that the steel wire surface of the steel wire mesh 10 faces the beam reinforcement surface 21 and is embedded in the adhesive material layer 30.

[0088] S500: After leveling and compacting the surface of the bonding material layer 30, maintain the tensioning prestress of the tensioning device 40 on the steel wire mesh cloth 10 until the bonding material layer 30 is cured; if the thickness of the bonding material layer 30 does not meet the design thickness requirements, apply a second layer of bonding material and wait for it to cure.

[0089] S600, cut the steel wire mesh 10 at the anchoring position between the tensioning device 40 and the steel wire mesh 10, then remove the tensioning device 40 and cut off the exposed part of the anchor bolt implanted in the anchor bolt hole.

[0090] It should be noted that the preferred bonding material is concrete mortar, but epoxy resin adhesive can also be used.

[0091] Compared with the prior art, the construction method of the planar beam anchoring system provided in this embodiment applies pretension to the steel wire mesh 10 before the bonding material layer 30 is cured by the tensioning device 40. This allows the steel wire mesh 10 to maintain the tensile stress on the planar beam 20 after the bonding material layer 30 is cured, and to be integrated with the beam reinforcement surface 21 to share the load. This fully utilizes the high modulus and high strength characteristics of the steel wire mesh 10 to achieve active reinforcement of the planar beam 20. This not only increases the deflection load of the planar beam 20 and prevents cracking and damage, but also promotes the closure of cracks in the already broken planar beam 20, extends the safe service life of the planar beam, and greatly improves the reinforcement effect of the planar beam 20.

[0092] In conjunction with the second aspect, in one possible implementation, the anchoring of the tensioning device 40 to the tensioning end of the wire mesh 10 in step S300 above includes the following steps:

[0093] Step S301: Seal the tension end of the steel wire mesh 10 and attach steel strips 11 along its edge. The two ends of the steel strips 11 extend to the outer side of the width direction of the steel wire mesh 10.

[0094] Step S302: Insert the tensioned end of the steel wire mesh 10 into the anchoring cylinder 422 through the seam 4221, and curl it into a spiral shape under the guidance of the spiral guide sleeve 425. Then cut off the protruding part of the steel strip 11 along the side of the steel wire mesh 10.

[0095] Step S303: Seal the joint 4221 and one end of the anchoring cylinder 422, and then inject grout 423 into the anchoring cylinder 422 so that the grout 423 fills the gap inside the anchoring cylinder 422 and the gap of the spiral layer of the spiral guide sleeve 425; wherein, the grout 423 injected is preferably epoxy resin adhesive.

[0096] Step S304: Wait for the grout 423 to cure so that the tensioned end of the steel wire mesh 10 is connected to the anchoring cylinder 422.

[0097] Specifically, when anchoring the tensioned end of the steel wire mesh 10, high-viscosity liquid epoxy nitrile rubber can be used for edge sealing, thereby avoiding the twisting of the end steel wires when inserting it into the anchoring cylinder 422, which would increase the difficulty. On this basis, by bonding steel strips 11 to the edge of the tensioned end, both ends of the steel strips 11 can be held during the insertion into the spiral guide sleeve 425, making the operation simple and convenient. This ensures that the edge of the tensioned end of the steel wire mesh 10 extends to the deepest part of the spiral layer gap, improving the anchoring quality. At the same time, after the steel wire mesh 10 is inserted, the two ends of the steel strips 11 that protrude outside the anchoring cylinder 422 are cut off. On the one hand, this facilitates the sealing and grouting of the anchoring cylinder 422. On the other hand, the end of the steel wire mesh 10 and the steel strips 11 together form a stepped structure, which can improve the tensile strength after the grout 423 has cured.

[0098] Optionally, as another implementation, the anchoring of the tensioning device 40 to the tensioning end of the wire mesh cloth 10 in step S300 above includes the following steps:

[0099] Step S301': Pass the tensioned end of the steel wire mesh cloth 10 through the limiting groove 4272 and the through groove 4273 inside the base 427 facing the beam reinforcement surface 21 in sequence, and then bend it in the opposite direction. Then, embed the bent part into the anchoring groove 4271 on the wall of the base 427 away from the beam reinforcement surface 21.

[0100] Step S302': The pressure cap 428 is screwed onto the base 427 with fasteners, so that the insert 4281 on the pressure cap 428 is embedded into the anchor groove 4271 to press the tension end of the steel wire mesh cloth 10.

[0101] Step S303': Apply pretension to the steel wire mesh cloth 10 through the tensioning device 40 and maintain pressure. After the pressure maintenance is completed, tighten the fasteners a second time.

[0102] After the tensioned end of the steel wire mesh 10 is pressed into the anchor groove 4271 by the pressure cap 428, a pre-tensioning is performed first to ensure that the steel wire mesh 10 is tightly attached to the bottom of the anchor groove 4271. Then the fasteners are screwed on again, thereby improving the clamping reliability of the pressure cap 428 on the steel wire mesh 10 and avoiding the situation where the steel wire mesh 10 wrinkles in the anchor groove 4271, which would affect the tensile strength of the anchor.

[0103] It should be noted that, in this embodiment, if the steel wire mesh 10 is tensioned at one end, a wedge groove is opened at one end of the layout and positioning area, and the fixed end of the steel wire mesh 10 is embedded in the wedge groove. Then, the wedge groove is filled with adhesive material and the adhesive material is allowed to cure, thereby completing the anchoring of the fixed end of the steel wire mesh 10.

[0104] The tensioning direction of the tensioning device 40 has a first included angle with the beam reinforcement surface 21, and the vertical distance between the tensioning end of the tensioning device 40 and the beam reinforcement surface 21 gradually decreases during the tensioning process; when the wire mesh 10 is tensioned at one end, the bottom of the wedge groove has a second included angle with the beam reinforcement surface 21, and the wedge groove gradually deepens in the direction away from the tensioning device 40, and the fixed end of the wire mesh 10 is in contact with the bottom of the wedge groove; the first included angle is equal to the second included angle, which is equal to 1° to 5°;

[0105] If the steel wire mesh 10 is tensioned at both ends, then the tensioning directions of the two tensioning devices 40 have a first included angle with the beam reinforcement surface.

[0106] By setting the included angle, the steel wire mesh 10 can be squeezed closer to the beam reinforcement surface 21 during the tensioning process, ensuring that the steel wire mesh 10 and the beam reinforcement surface 21 can be tightly attached after tensioning, thereby preventing the ends of the steel wire mesh 10 from curling up, thus improving the reinforcement effect and construction safety.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A planar beam anchoring system, characterized by, The utility model relates to a kind of steel wire mesh, which is attached to the reinforcement surface of beam body, and the two ends of the steel wire mesh are fixed end and tension end respectively, or the two ends of the steel wire mesh are both tension end, wherein the fixed end is fixed to the reinforcement surface of beam body by bonding material curing bonding;Tensioning device is detachably connected to the reinforcement surface of beam body, and tensioning output end is fixedly connected with the tension end of the steel wire mesh, for applying tensioning prestress to the steel wire mesh;The tensioning device includes tensioning support, tensioning anchor, tensioning baffle and tensioning driving element;Two tensioning screws are slidably arranged on the tensioning support along the extension direction of the steel wire mesh, and the thrust force applied by the tensioning driving element to the tensioning baffle is transmitted to the tensioning anchor by the two tensioning screws;The tensioning anchor includes: force shaft, two ends are detachably connected with two tensioning screws respectively; Anchoring cylinder is coaxially sleeved on the force shaft, and is located between the two tensioning screws, and the cylinder wall of the anchoring cylinder is provided with a slit suitable for the tension end of the steel wire mesh to pass through; The cross section of the force shaft is a regular polygon, and a sleeve pipe matched with the shape of the force shaft is sleeved on the force shaft, and an anchoring space is formed between the outer wall of the sleeve pipe and the inner wall of the anchoring cylinder, a spiral guide sleeve is arranged in the anchoring space, the tension end of the steel wire mesh is inserted into the spiral layer gap of the spiral guide sleeve to form a spiral shape, and the spiral layer gap is divided into two pouring cavities, and different slurries are poured into the two pouring cavities;Wherein, the steel wire mesh maintains the tensioning prestress and is cured and bonded with the reinforcement surface of beam body by the bonding material layer to form an integral whole. The tensioning device includes: tensioning support, which is detachably connected to the reinforcement surface of beam body, and two tensioning screws are slidably arranged on the tensioning support along the extension direction of the steel wire mesh, and the two tensioning screws are symmetrically distributed on both sides of the steel wire mesh; Tensioning anchor, two ends are connected with two tensioning screws respectively, and the tensioning anchor is used for anchoring the tension end of the steel wire mesh; 2. The flat truss anchoring system of claim 1, wherein, Tensioning baffle, which is located on both sides of the tensioning support respectively with the tensioning anchor, and the two ends of the tensioning baffle are connected with the end parts of the two tensioning screws away from the tensioning anchor respectively; Tensioning driving element, which is arranged on the symmetry axis of the two tensioning screws, one end of the tensioning driving element is connected with the tensioning support, and the other end is connected with the tensioning baffle, for pushing the tensioning baffle and driving the tensioning anchor to apply the tensioning prestress to the steel wire mesh through the tensioning screw. The tensioning device further includes two guide rails, and the two ends of the tensioning anchor are slidably connected with the two guide rails respectively. The tensioning anchor includes: base, two ends are slidably connected on two guide rails respectively, and two ends are detachably connected with two tensioning screws respectively, and the base is provided with an anchoring groove, and the groove bottom of the anchoring groove is a continuous curved surface.

3. The flat truss anchoring system of claim 2, wherein, ​ 4. The flat truss anchoring system of claim 3, wherein, ​ ​ A cover is arranged on the anchoring groove and detachably connected with the base. The cover is provided with an embedded block matching the shape of the anchoring groove. The embedded block is embedded in the anchoring groove and cooperates with the groove bottom to clamp the tensioned end of the steel wire mesh. The wall surface of the base facing the beam body reinforcing surface is provided with a limiting groove, and the anchoring groove is provided with a through groove penetrating the limiting groove at the side edge close to the tensioning support.

5. The method of installing a planar beam anchoring system according to any one of claims 1-4, wherein, The method comprises the following steps: The anchor bolt hole position is marked according to the width of the steel wire mesh and the length after tensioning; The steel wire mesh is fixed at one end of the wire positioning area by adhesive material, and the wire positioning area is roughened. If the steel wire mesh is tensioned at one end, the adhesive material is solidified. The tensioning device is installed based on the anchor bolt hole position. If the steel wire mesh is tensioned at one end, one tensioning device is used to anchor the tensioned end of the steel wire mesh. If the steel wire mesh is tensioned at both ends, two tensioning devices are used to anchor the two ends of the steel wire mesh. The surface of the adhesive layer is leveled and compacted, and the tensioning stress of the steel wire mesh is maintained by the tensioning device until the adhesive layer is solidified. If the thickness of the adhesive layer does not meet the design thickness requirement, a second layer of adhesive is applied and solidified. The steel wire mesh is cut along the anchoring position of the tensioning device and the steel wire mesh, and then the tensioning device is removed. The exposed part of the anchor bolt implanted in the anchor bolt hole position is cut off. The tensioning device and the tensioned end of the steel wire mesh are anchored, which comprises the following steps:

6. The method of installing a planar beam anchoring system of claim 5, wherein, The tensioned end of the steel wire mesh is edge-sealed and steel bars are adhered along the edges. The two ends of the steel bars extend to the outside of the width direction of the steel wire mesh. The tensioned end of the steel wire mesh is inserted into the anchoring cylinder through the seam, and is curled to form a spiral under the guidance of the spiral guide sleeve. The overhanging part of the steel bar is cut along the side edge of the steel wire mesh. The seam and one end of the anchoring cylinder are closed, and then grout is poured into the anchoring cylinder to fill the gap inside the anchoring cylinder and the gap between the spiral layers of the spiral guide sleeve. The grout is solidified to integrate the tensioned end of the steel wire mesh with the anchoring cylinder. The tensioning device and the tensioned end of the steel wire mesh are anchored, which comprises the following steps:

7. The method of installing a planar beam anchoring system of claim 5, wherein, The tensioned end of the steel wire mesh is reversely bent after passing through the limiting groove on the wall surface of the base facing the beam body reinforcing surface and the through groove inside the base in sequence, and then the bent part is embedded in the anchoring groove on the wall surface of the base facing away from the beam body reinforcing surface. ​ The cap is screwed on the base through fasteners, and the inserts on the cap are embedded into the anchoring grooves to compress the tensioned end of the steel wire mesh; The pre-tension is applied to the steel wire mesh through the tensioning device, and the fasteners are tightened again after the pre-tension is maintained.

8. The method of installing a slab-beam anchoring system of claim 5, wherein, If the steel wire mesh is tensioned at one end, a wedge-shaped groove is formed at one end of the positioning area, and the fixed end of the steel wire mesh is embedded into the wedge-shaped groove, then the wedge-shaped groove is filled with adhesive material and waits for the adhesive material to solidify, thereby completing the anchoring of the fixed end of the steel wire mesh. The tensioning direction of the tensioning device and the reinforcing surface of the beam body have a first included angle, and the vertical distance between the tensioning end of the tensioning device and the reinforcing surface of the beam body gradually decreases during the tensioning process; the bottom of the wedge-shaped groove and the reinforcing surface of the beam body have a second included angle, and the wedge-shaped groove gradually deepens in the direction away from the tensioning device, and the fixed end of the steel wire mesh is attached to the bottom of the wedge-shaped groove; wherein the first included angle is equal to the second included angle, which is 1°-5°. If the steel wire mesh is tensioned at both ends, the tensioning direction of the two tensioning devices and the reinforcing surface of the beam body have the first included angle.

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