Post-tensioned retard-bonded prestressed concrete beam

Abstract

The invention discloses a post-tensioned retard-bonded prestressed concrete beam, belongs to the technical field of concrete beams, and solves the problems that positioning distribution in the beam is easy to damage and the stress performance of the beam is influenced when the concrete beam is tensioned. The outer sides of the four sets of steel reinforcement frameworks are sleeved with a plurality of prestressed tendons in the length direction, the outer sides of the steel reinforcement frameworks and the outer sides of the prestressed tendons are wrapped with slow-binding agents, and sheath assemblies are clamped to the outer side fillet positions of the steel reinforcement frameworks and the outer sides of the prestressed tendons. Fixing frames are fixedly connected to the centers of the front end face and the rear end face of the concrete body respectively, fixing rings are movably connected to the outer end faces of the fixing frames, beam end anchors penetrate through the fixing frames and the fixing rings, and the inner ends of the beam end anchors are connected into the concrete body in a penetrating mode. Through gradual curing of the slow-binding agent, it is ensured that the prestressed tendons are tensioned within the tensioning working period in the concrete body, and the rigidity, the bearing capacity and the ductility of the structure are improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete beams, in particular to a post-tensioned slow-bonding prestressed concrete beam. Background Art

[0002] Concrete beams are common and important horizontal load-bearing components in building structures. They are mainly composed of concrete and steel bars. Concrete provides compressive strength, while steel bars mainly bear tensile strength. The two work together to enable beams to withstand various loads. In building structures, concrete beams have the important task of transferring the load from the floor to vertical load-bearing components such as columns or walls. Their design and construction quality directly affect the safety, stability and durability of the entire building structure.

[0003] In the prior art, the prestressed tendons are located on the outside of the steel bars inside the concrete beam. Since the prestressed tendons are tensioned inside the concrete beam within a predetermined time after the construction is completed, the prestressed tendons generate a large local pressure on the surrounding concrete during tensioning, which may cause local compressive damage to the concrete, affecting the integrity and bearing capacity of the beam. If the construction operation is improper, the bond between the steel bars and the concrete may be weakened, thereby affecting the performance of the coordinated work of the two. If the positioning of the prestressed tendons is inaccurate during construction, its distribution in the beam may not meet the design requirements, affecting the application effect of the prestress and the force-bearing performance of the beam. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the positioning distribution inside the concrete beam is easily destroyed and the stress performance of the beam is affected when the concrete beam is tensioned. The present invention provides a post-tensioned slow-bonded prestressed concrete beam.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A post-tensioned slow-bonding prestressed concrete beam comprises a concrete body, wherein: four groups of steel bar skeletons are respectively arranged at the four corners of the concrete body and along the length direction of the concrete body, each group of the steel bar skeleton comprises a skeleton body and a bone groove, and the bone groove is arranged at the side wall of the skeleton body; a plurality of prestressed tendons are sleeved on the outer sides of the four groups of steel bar skeletons along the length direction, and the prestressed tendons are respectively clamped in the corresponding bone grooves on the steel bar skeletons, and the outer sides of the steel bar skeletons and the prestressed tendons are wrapped with a slow-bonding agent, and the bends arranged at the prestressed tendons The inner corner of the angle is filled and tightly sealed by the gap at the bone groove set on the side wall of the frame body with a slow adhesive, so that the inner side of the angle is tightly connected to the bone groove; the steel frame and the outer rounded corner of the prestressed tendon are clamped with a sheath component, the sheath component includes an outer sheath, and a steel bar clamping groove for clamping the prestressed tendon is arranged on the inner wall of the outer sheath. After extrusion coating, the outer side of the angle set at the prestressed tendon and the gap at the steel bar clamping groove set on the inner side of the sheath component are filled and tightly sealed, so that the outer side of the angle is tightly connected to the steel bar clamping groove; The core parts of the front and rear end surfaces of the concrete body are respectively fixedly connected with fixing frames, and the outer end surfaces of the fixing frames are movably connected with fixing rings. Beam end anchors are arranged through the fixing frames and the fixing rings, and the inner ends of the beam end anchors are connected through the interior of the concrete body.

[0006] Furthermore, the prestressed tendons include tendon rods and bends, the inner bend of the bend is clamped on the side wall of the tendon rod, the tendon rod and the bend are alternately connected end to end in sequence, and the slow-adhesive agent covers the outer surfaces of the tendon rod and the bend.

[0007] Furthermore, the prestressed tendons are arranged in a square shape, and the bends are arranged at the four corners of the tendon rod.

[0008] Furthermore, the steel bar slots are evenly arranged on the inner wall of the outer sheath.

[0009] Furthermore, the fixing frame is located between the inner circles of the four groups of steel skeletons, and the inner ends of the beam end anchors penetrate the concrete bodies between the inner circles of the four groups of steel skeletons, thereby increasing the grip on the concrete.

[0010] Compared with the prior art, the present invention provides a post-tensioned slow-bonded prestressed concrete beam, which has the following beneficial effects: 1. Within a predetermined time after the completion of construction, the present invention gradually solidifies the retarder to ensure that the prestressed tendons are tensioned within the tensioning applicable period inside the concrete body, thereby effectively applying prestress. The tensioning of the prestressed tendons effectively limits the development of concrete cracks, increases the rigidity, bearing capacity and ductility of the structure, and after the retarder is solidified, it forms a good bite bond with the surrounding concrete, further improving the integrity and stress-bearing performance of the structure.

[0011] 2. The prestressed tendons in the present invention are wrapped by a corrosion-resistant slow-setting adhesive and an outer sheath to form two protective layers, which enhances the corrosion resistance of the prestressed tendons. The tensioning process is completed within the gap defined by the steel skeleton and the sheath assembly, and the required prestressing force can be effectively applied. Without affecting the integrity of the concrete beam, the tensioning function of the prestressed tendons is realized, thereby ensuring the stability and safety of the concrete beam under stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the structure of the steel bar skeleton, prestressed bars and sheath components of the present invention; Figure 3 It is a schematic diagram of the structure of the steel reinforcement skeleton of the present invention; Figure 4 It is a schematic diagram of the structural details of the prestressed tendons of the present invention; Figure 5 It is a schematic diagram of the assembly structure of the fixing frame, the fixing ring and the beam end anchor of the present invention; Figure 6 It is a schematic structural diagram of the sheath assembly of the present invention.

[0013] In the figure: 1. Concrete body; 2. Steel bar skeleton; 21. Skeleton body; 22. Bone groove; 3. Prestressed tendons; 31. Reinforcement rods; 32. Bending angles; 4. Retarding agent; 5. Fixing frame; 6. Fixing ring; 7. Beam end anchor; 8. Sheath assembly; 81. External sheath; 82. Rebar slot. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] like Figures 1 to 6A post-tensioned slow-bonding prestressed concrete beam shown comprises a concrete body 1, wherein: four groups of steel skeletons 2 are respectively arranged at the four corners of the concrete body 1 and along the length direction of the concrete body 1, each group of the steel skeletons 2 comprises a skeleton body 21 and a bone groove 22, and the bone groove 22 is arranged at the side wall of the skeleton body 21; a plurality of prestressed tendons 3 are sleeved on the outer sides of the four groups of steel skeletons 2 along the length direction, and the prestressed tendons 3 are respectively clamped in the corresponding bone grooves 22 on the steel skeletons 2, and the outer sides of the steel skeletons 2 and the prestressed tendons 3 are wrapped with a slow-bonding agent 4; a sheath assembly 8 is clamped at the outer rounded corners of the steel skeletons 2 and the prestressed tendons 3, and the sheath assembly 8 comprises an outer sheath 81, and a steel clamping groove 82 for clamping the prestressed tendons 3 is arranged on the inner wall of the outer sheath 81; The core parts of the front and rear end surfaces of the concrete main body 1 are respectively fixedly connected with a fixing frame 5, and the outer end surface of the fixing frame 5 is movably connected with a fixing ring 6. A beam end anchor 7 is arranged through the fixing frame 5 and the fixing ring 6, and the inner end of the beam end anchor 7 is connected to the interior of the concrete main body 1.

[0016] Furthermore, the prestressed tendon 3 includes a tendon rod 31 and a bend 32, the inner bend of the bend 32 is clamped on the side wall of the tendon rod 31, the tendon rod 31 and the bend 32 are alternately connected end to end in sequence, and the slow-adhesive agent 4 covers the outer surfaces of the tendon rod 31 and the bend 32.

[0017] Furthermore, the prestressed tendons 3 are arranged in a square shape, and the bends 32 are arranged at the four corners of the tendon rod 31 .

[0018] Furthermore, the steel bar slots 82 are evenly arranged on the inner wall of the outer sheath 81 .

[0019] Furthermore, the fixing frame 5 is located between the inner circles of the four groups of steel skeletons 2 , and the inner ends of the beam end anchors 7 penetrate the concrete body 1 between the inner circles of the four groups of steel skeletons 2 .

[0020] The working principle of the present invention is as follows: Figure 1-Figure 6As shown, a certain thickness of retarder 4 is wrapped on the outside of the prestressed tendon 3, and the retarder 4 has good adhesion to steel. After extrusion coating, the gap between the outside of the bend 32 set at the prestressed tendon 3 and the steel bar slot 82 set on the inside of the sheath component 8 is filled and tightly sealed. At the same time, the inner corner of the bend 32 set at the prestressed tendon 3 is filled and tightly sealed by the retarder 4 and the gap between the bone groove 22 set on the side wall of the skeleton body 21. The concrete body 1 is filled into the mold to wrap the steel skeleton 2, the prestressed tendon 3 and the sheath component 8. Within a predetermined time after the construction is completed, as the retarder 4 gradually solidifies, the prestressed tendons 3 form a bond with the surrounding concrete inside the concrete body 1, and the prestressed tendons 3 and the surrounding concrete form a whole, so that the prestressed tendons 3 complete the tensioning within the tensioning applicable period inside the concrete body 1, and the inner side of the beam end anchor 7 can be inserted into the interior of the concrete body 1 to increase the grip on the concrete. The beam end anchor 7 is located at the outer end of the concrete body 1 and can be used as a plug-in fixture during installation.

Claims

1. A post-tensioned slow-bonded prestressed concrete beam, comprising a concrete body (1), characterized in that: Four groups of steel skeletons (2) are respectively arranged at the four corners of the concrete body (1) and along the length direction of the concrete body (1), each group of the steel skeletons (2) comprises a skeleton body (21) and a bone groove (22), and the bone groove (22) is arranged at the side wall of the skeleton body (21); a plurality of prestressed tendons (3) are sleeved on the outer sides of the four groups of steel skeletons (2) along the length direction, and the prestressed tendons (3) are respectively clamped in the corresponding bone grooves (22) on the steel skeletons (2), and the outer sides of the steel skeletons (2) and the prestressed tendons (3) are wrapped with a slow-adhesion agent (4); a sheath assembly (8) is clamped at the outer rounded corner position of the steel skeleton (2) and the prestressed tendons (3), and the sheath assembly (8) comprises an outer sheath (81), and a steel bar clamping groove (82) for clamping the prestressed tendons (3) is arranged on the inner wall of the outer sheath (81); The center parts of the front and rear end surfaces of the concrete body (1) are respectively fixedly connected to fixing frames (5), the outer end surface of the fixing frame (5) is movably connected to a fixing ring (6), a beam end anchor (7) is arranged penetrating the fixing frame (5) and the fixing ring (6), and the inner end of the beam end anchor (7) is connected to the interior of the concrete body (1).

2. A post-tensioned slow-bonded prestressed concrete beam according to claim 1, characterized in that: The prestressed tendons (3) comprise a tendon rod (31) and a bend (32), the inner bend of the bend (32) being clamped to the side wall of the tendon rod (31), the tendon rod (31) and the bend (32) being connected end to end alternately in sequence, and the slow-adhesion agent (4) covering the outer surfaces of the tendon rod (31) and the bend (32).

3. A post-tensioned slow-bonded prestressed concrete beam according to claim 2, characterized in that: The prestressed tendons (3) are arranged in a square shape, and the bends (32) are arranged at the four corners of the tendon rod (31).

4. The post-tensioned slow-bonded prestressed concrete beam according to claim 1, characterized in that: The steel bar clamping grooves (82) are evenly arranged on the inner wall of the outer sheath (81).

5. The post-tensioned slow-bonded prestressed concrete beam according to claim 1, characterized in that: The fixing frame (5) is located between the inner circles of the four groups of steel reinforcement skeletons (2), and the inner ends of the beam end anchors (7) penetrate the concrete body (1) between the inner circles of the four groups of steel reinforcement skeletons (2).

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