Concrete floor reinforcing multi-directional synchronous tensioning adjusting system and construction method

Abstract

This invention discloses a multi-directional synchronous tensioning and adjustment system and construction method for reinforcing concrete floor slabs. The system includes a central support and a guide ring. The central support comprises a central tube with an upper end plate at its upper end and a lower end plate at its lower end. The upper end plate is connected to the center of the floor slab via fixing bolts and anchor plates. The guide ring is slidably fitted onto the central tube vertically and is connected to the lower end plate via adjusting bolts. Four steel strands are evenly distributed around the guide ring, with one end anchored to the guide ring and the other end anchored to the concrete beams surrounding the floor slab. This invention relies on the linkage structure of the central support and the sliding guide ring, allowing the four steel strands to move and be stressed synchronously, completely avoiding the problem of uneven stress distribution in individual strands. The overall stress on the floor slab is reasonable, preventing secondary cracks. It also possesses continuous vertical adjustment capability, allowing for relaxation and replenishment of tension at any time after forming to offset long-term stress relaxation in the steel strands and ensure long-term stable reinforcement results.

Description

Technical Field

[0001] This invention relates to the field of existing building concrete floor slab reinforcement technology, specifically to a multi-directional synchronous tensioning and adjustment system and construction method for reinforcing concrete floor slabs. Background Technology

[0002] Existing cast-in-place concrete floor slabs are prone to problems such as excessive deflection, cracking, and insufficient load-bearing capacity after years of use. Conventional reinforcement methods, such as bonding steel plates, bonding carbon fiber cloth, and adding secondary beams, have problems such as poor reinforcement durability, occupying space for pipe installation, increasing self-weight, and causing significant damage to the original structure.

[0003] Existing external prestressed steel strand reinforcement methods mostly employ single-strand tensioning, which has significant drawbacks: (1) The steel strands are tensioned separately, and the tension force is difficult to be synchronized and balanced. The floor slab is subjected to uneven stress, which can easily generate additional secondary stress and secondary cracks. (2) Without a central linkage adjustment structure, the relaxation amount cannot be finely adjusted after tensioning, and the prestress of the steel strand cannot be re-tensioned after relaxation in the later stage. (3) There are no standardized complete sets of components, and the on-site assembly of loose parts is arbitrary, making it difficult to guarantee the reliability of the structure and the corrosion resistance and durability; (4) Large tensioning jacks need to be equipped on site. The space under the floor slab is small, which restricts the entry and operation of equipment and reduces construction efficiency. Summary of the Invention

[0004] To address the existing technical problems, this invention provides a multi-directional synchronous tensioning and adjustment system and construction method for reinforcing concrete floor slabs, consisting of a central support, a sliding guide ring, and adjusting bolts. It eliminates the need for large tensioning equipment, allows for manual synchronous tightening, and enables repeated fine-tuning and supplementary tensioning later. The components are standardized, the stress is clearly defined, and the construction is convenient, making it suitable for various floor slab bottom reinforcement scenarios.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs includes a central support and a guide ring. The central support includes a central tube with an upper end plate at its upper end and a lower end plate at its lower end. The upper end plate is connected to the center of the floor slab by fixing bolts and anchor plates. The guide ring is slidably fitted onto the central tube in the vertical direction. The guide ring is connected to the lower end plate by adjusting bolts. Four steel strands are evenly distributed around the guide ring. One end of each steel strand is anchored to the guide ring, and the other end is anchored to the concrete beams around the floor slab.

[0006] Preferably, the guide ring includes an inner ring and an outer ring concentrically arranged with the inner ring. The inner ring is slidably sleeved on the central tube. A base plate is provided at the bottom of the inner ring and the outer ring, and the base plate is located between the inner ring and the outer ring. The base plate is connected to the lower end plate by the adjusting bolt.

[0007] Preferably, four sets of first stiffening plates are evenly distributed between the outer wall of the inner ring and the inner wall of the outer ring, with two plates in each set. The base plate has four first mounting holes for connecting with the adjusting bolts, with each first mounting hole located between the two first stiffening plates in the corresponding set.

[0008] Preferably, four second mounting holes are evenly distributed along the circumference of the outer ring, and a second anchor is provided on the inner wall of the outer ring at the position corresponding to the second mounting holes. One end of the steel strand passes through the second mounting hole and is anchored to the second anchor.

[0009] Preferably, the second mounting hole and the first mounting hole are distributed at circumferential intervals along the guide ring.

[0010] Preferably, four second stiffening plates are evenly distributed circumferentially between the central tube and the upper end plate.

[0011] Preferably, four sets of third stiffening plates are evenly distributed between the central tube and the lower end plate, with two plates in each set, and the connection between the adjusting bolt and the lower end plate is located between the two third stiffening plates in the corresponding set.

[0012] A construction method for a multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs, comprising the following main steps: S1, System installation: Drill holes at the center of the floor slab, with the spacing of the holes determined in conjunction with the anchor plate. Fix the upper plate, floor slab, and anchor plate with fixing bolts to ensure that the central support is installed vertically. S2, Layout and anchor point setting: Mark the anchoring positions of the outer ends of the steel strands on the concrete beams around the floor slab in four directions, and drill holes in the concrete beams to install the anchor pads and the first anchor. S3, adjust the nut of the adjusting bolt to make the guide ring horizontal, install the steel strand, use the second anchor to anchor one end of the steel strand to the guide ring, and pass the other end through the hole in the concrete beam. Use a small jack to tension the four steel strands simultaneously until the predetermined load is reached, and then fix them with the first anchor. S4. After the subsequent maintenance and tensioning are put into use, if the prestress of the steel strands loosens or the floor slab deflects, the adjusting bolts are rotated again to move the guide ring down, so that the steel strands are tensioned again to the design internal force value and then locked again.

[0013] Preferably, step S1 further includes applying structural adhesive to the contact areas of the fixing bolts, the upper end plate, the anchor plate, and the floor slab.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention relies on the linkage structure of central support + sliding guide ring, and the four steel strands are simultaneously displaced and stressed, which completely avoids the problem of uneven tension stress of a single strand, and the overall stress of the floor slab is reasonable and no secondary cracks are generated. (2) The later tensioning can be completed by mechanically pushing the adjusting bolts. The narrow space under the floor slab can be constructed normally. There is no need for large equipment such as jacks to enter the site. The construction cost is low and the site adaptability is strong. Only small jacks are needed to tension the steel strands in the early stage. (3) It can be finely adjusted and re-tensioned. The system has the ability to continuously adjust vertically. After forming, it can be relaxed and re-tensioned at any time to offset the long-term stress relaxation of the steel strand and ensure the long-term stability of the reinforcement effect. (4) The system components can be produced in a standardized manner, and only assembly and installation are required on site. The construction quality is controllable and the reliability is high. The structure has high rigidity and good durability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure in which the central support, guide ring, and anchor plate are assembled together; Figure 3 for Figure 1 A schematic diagram of the central support structure; Figure 4 for Figure 3 The main view; Figure 5 for Figure 4 MM-directed sectional view; Figure 6 for Figure 4 NN-direction cross-sectional view; Figure 7 for Figure 1 A schematic diagram of the guide ring structure in the middle; Figure 8 for Figure 7 A schematic diagram of the structure after removing the outer ring; Figure 9 This is a schematic diagram of the structure of the present invention in use.

[0016] In the diagram: 1. Central support; 2. Guide ring; 3. Anchor plate; 4. Fixing bolt; 5. Adjusting bolt; 6. Steel strand; 7. Floor slab; 11. Central tube; 12. Upper end plate; 13. Lower end plate; 14. Second stiffening plate; 15. Third stiffening plate; 16. Third mounting hole; 17. Fourth mounting hole; 21. Inner ring; 22. Outer ring; 23. Base plate; 24. First stiffening plate; 25. Second mounting hole; 26. First mounting hole; 61. First anchor; 62. Second anchor; 71. Concrete beam. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] As attached Figure 1 -Appendix Figure 9The illustrated multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs includes a central support 1 and a guide ring 2. The central support 1 includes a central tube 11 with an upper end plate 12 at its upper end and a lower end plate 13 at its lower end. The planes of the upper end plate 12 and the lower end plate 13 are parallel to the horizontal plane. Four third mounting holes 16 are evenly distributed along the circumference of the upper end plate 12, each corresponding to an assembly hole on an anchor plate 3. Fixing bolts 4 are installed between the third mounting holes 16 and the corresponding mounting holes on the anchor plate 3. The upper end plate 12 is connected to the anchor plate 3 at the center of the floor slab 7 via the fixing bolts 4. The guide ring 2 is slidably fitted onto the central tube 11 in the vertical direction. The guide ring 2 is connected to the lower end plate 13 via adjusting bolts 5. Four steel strands 6 are evenly distributed along the circumference of the guide ring 2, with one end of each steel strand 6 anchored to the guide ring 2 and the other end anchored to the concrete beams 71 surrounding the floor slab 7.

[0022] refer to Figures 3-6 Four second stiffening plates 14 are evenly distributed circumferentially between the central tube 11 and the upper end plate 12. Four fourth mounting holes 17 are evenly distributed circumferentially on the lower end plate 13, and the fourth mounting holes 17 correspond one-to-one with the first mounting holes 26 provided on the base plate 23. Adjusting bolts 5 are connected to the corresponding fourth mounting holes 17 and first mounting holes 26. Four sets of third stiffening plates 15 are evenly distributed between the central tube 11 and the lower end plate 13, with two in each set. The fourth mounting holes 17 are located between the two third stiffening plates 15 in the corresponding set.

[0023] Specifically, in this embodiment, the upper end plate 12 is preferably a circular steel plate with an outer diameter of 500 mm and a thickness of 12 mm, and the diameter of the third mounting hole 16 is preferably 22 mm. The lower end plate 13 is preferably a circular steel plate with an outer diameter of 325 mm and a thickness of 8 mm, and the diameter of the fourth mounting hole 17 distributed on it is preferably 24 mm. The central tube 11 is preferably a seamless steel tube with a specification of φ114×10 mm and a length of 600 mm. The third stiffening plate 15 is triangular, with a plate thickness of 6 mm, and a total of eight are provided. The second stiffening plate 14 is a triangular plate, with a plate thickness of 10 mm, and a total of four are provided.

[0024] refer to Figure 7 and Figure 8 The guide ring 2 includes an inner ring 21 and an outer ring 22 concentrically arranged with the inner ring 21. The inner ring 21 is slidably sleeved on the central tube 11. A base plate 23 is provided at the bottom of the inner ring 21 and the outer ring 22. The base plate 23 is circular and is welded to the bottom of the inner ring 21 and the outer ring 22 respectively. The base plate 23 is located between the inner ring 21 and the outer ring 22. The base plate 23 is connected to the lower end plate 13 by the adjusting bolt 5.

[0025] Four sets of first stiffening plates 24 are evenly distributed between the outer wall of the inner ring 21 and the inner wall of the outer ring 22, with two plates in each set, for a total of eight. Four first mounting holes 26 for connecting with the adjusting bolts 5 are distributed on the base plate 23, with each first mounting hole 26 located between two first stiffening plates 24 in the corresponding set.

[0026] Four second mounting holes 25 are evenly distributed along the circumference of the outer ring 22. A second anchor 62 is provided on the inner wall of the outer ring 22 at the position corresponding to the second mounting holes 25. One end of the steel strand 6 passes through the second mounting hole 25 and is anchored to the second anchor 62. The second mounting holes 25 and the first mounting holes 26 are distributed at intervals along the circumference of the guide ring 2.

[0027] In this embodiment, the inner ring 21 is preferably a seamless steel pipe with a specification of φ140×12mm and a length of 120mm. The outer ring 22 is preferably a seamless steel pipe with a specification of φ325×14mm and a length of 120mm. Four second mounting holes 25 are evenly distributed on the outer ring 22. The diameter of the second mounting holes 25 is 20mm. The edges of the second mounting holes 25 are chamfered and ground smooth. The center distance of the second mounting holes 25 from the upper edge of the outer ring 22 is 35mm. The second mounting holes 25 are used to install the second anchor 62 and the steel strand 6. The base plate 23 is a circular ring plate with an outer diameter of 297mm, an inner diameter of 140mm, and a plate thickness of 10mm. It has four first mounting holes 26 with a diameter of 24mm, which are evenly distributed. The first mounting holes 26 correspond vertically to the fourth mounting holes 17 on the lower end plate 13 of the center support 1. The first stiffening plate 24 is divided into four groups, totaling eight. The first stiffening plate 24 is a rectangular plate with a plate thickness of 6mm and a height of 70mm. The upper end of the first stiffening plate 24 is flush with the upper edge of the outer ring 22. The first stiffening plate 24 is welded between the inner ring 21 and the outer ring 22 to enhance the overall rigidity of the guide ring 2.

[0028] Anchor plate 3 is preferably a circular steel plate with an outer diameter of 500mm and a thickness of 12mm. Four 22mm diameter mounting holes are evenly distributed on anchor plate 3, their positions vertically corresponding to the third mounting holes 16 on the upper end plate 12 of the central support 1, for inserting fixing bolts 4. Fixing bolts 4 are preferably M20 ordinary high-strength bolts, used for positioning and locking between the central support 1, guide ring 2, and anchor plate 3, and are tightened and fixed after tensioning.

[0029] Adjusting bolt 5 is preferably an M22 high-strength adjusting bolt, with a matching double nut.

[0030] The first anchor 61 and the second anchor 62 are prefabricated single-hole clamp-type anchors, with specifications matching the steel strand 6, and respectively fixing the two ends of the steel strand 6.

[0031] The steel strand 6 is a low-relaxation prestressed steel strand with a nominal diameter of 15.2 mm and a strength grade of 1860 MPa. A total of 4 strands are set in a cross-shaped radial arrangement. One end is anchored to the guide ring 2 through the second anchor 62, and the other end is anchored to the preset anchoring point of the concrete beam 71 around the floor slab 7 through the first anchor 61.

[0032] A construction method for a multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs, employing... Figures 1-9 The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs, as shown, includes the following main steps: S1, System installation: Drill holes at the center of the floor slab 7. The spacing of the holes is determined in conjunction with the anchor plate 3. Fix the upper end plate 12, floor slab 7, and anchor plate 3 with fixing bolts 4 to ensure that the central support 1 is installed vertically. Apply structural adhesive to the contact areas of the fixing bolts 4, upper end plate 12, anchor plate 3, and floor slab 7. S2, Laying out and positioning anchor points: Mark the anchoring positions of the outer ends of the steel strands on the concrete beams 71 around the floor slab 7 in four directions. Drill holes in the concrete beams 71 to install the anchor pads and the first anchor 61. (Refer to...) Figure 9 ; S3, adjust the nut on the adjusting bolt 5 to make the guide ring 2 horizontal, install the steel strand 6, use the second anchor 62 to anchor one end of the steel strand 6 to the guide ring 2, and pass the other end through the hole on the concrete beam 71. Use a small jack to tension the four steel strands 6 simultaneously until the predetermined load is reached, and then fix them with the first anchor 61. S4. After the post-operation maintenance and tensioning are put into use, if the prestress of the steel strand 6 becomes loose and the deflection of the floor slab 7 increases, the adjusting bolt 5 is rotated again to move the guide ring 2 downward, so that the steel strand 6 is tensioned again to the design internal force value and then locked again. The internal force value of the secondary tensioning can be calculated by back-calculating the deformation of the steel strand 6 based on the adjustment amount of the adjusting bolt 5, and then the internal force value of the tensioning can be obtained.

[0033] Other details not specifically mentioned are existing technologies. When implementing these technologies, you can refer to existing technologies, but they will not be described in further detail here.

[0034] The preferred embodiments of the present invention have been described above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs, characterized in that: It includes a central support (1) and a guide ring (2). The central support (1) includes a central tube (11). The upper end of the central tube (11) is provided with an upper end plate (12) and the lower end is provided with a lower end plate (13). The upper end plate (12) is connected to the center of the floor slab (7) by fixing bolts (4) and anchor plates (3). The guide ring (2) is slidably sleeved on the central tube (11) in the vertical direction. The guide ring (2) is connected to the lower end plate (13) by adjusting bolts (5). The guide ring (2) has four steel strands (6) evenly distributed in the circumference. One end of the steel strand (6) is anchored on the guide ring (2), and the other end is anchored on the concrete beams (71) around the floor slab (7).

2. The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 1, characterized in that: The guide ring (2) includes an inner ring (21) and an outer ring (22) concentrically arranged with the inner ring (21). The inner ring (21) is slidably sleeved on the central tube (11). A base plate (23) is provided at the bottom of the inner ring (21) and the outer ring (22). The base plate (23) is located between the inner ring (21) and the outer ring (22). The base plate (23) is connected to the lower end plate (13) by the adjusting bolt (5).

3. The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 2, characterized in that: Four sets of first stiffening plates (24) are evenly distributed between the outer wall of the inner ring (21) and the inner wall of the outer ring (22), with two plates in each set. Four first mounting holes (26) for connecting with the adjusting bolt (5) are distributed on the base plate (23), with each first mounting hole (26) located between the two first stiffening plates (24) of the corresponding set.

4. The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 3, characterized in that: Four second mounting holes (25) are evenly distributed along the circumference of the outer ring (22). A second anchor (62) is provided on the inner wall of the outer ring (22) at the position corresponding to the second mounting holes (25). One end of the steel strand (6) passes through the second mounting hole (25) and is anchored to the second anchor (62).

5. The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 4, characterized in that: The second mounting hole (25) and the first mounting hole (26) are distributed circumferentially along the guide ring (2).

6. The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 5, characterized in that: Four second stiffening plates (14) are evenly distributed circumferentially between the central tube (11) and the upper end plate (12).

7. A multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 5, characterized in that: Four sets of third stiffening plates (15) are evenly distributed between the central tube (11) and the lower end plate (13), with two in each set. The connection between the adjusting bolt (5) and the lower end plate (13) is located between the two third stiffening plates (15) in the corresponding set.

8. A construction method for a multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs, characterized in that, The multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs as described in claim 6 or 7 includes the following main steps: S1, system installation: Drill holes in the center of the floor slab (7), and determine the spacing of the holes in conjunction with the anchor plate (3). Fix the upper plate (12), floor slab (7), and anchor plate (3) with fixing bolts (4) to ensure that the central support (1) is installed vertically. S2, Layout and anchor point setting: Mark the anchoring positions of the outer ends of the steel strands on the concrete beams (71) around the floor slab (7) in four directions, and drill holes on the concrete beams (71) to install the anchor pads and the first anchor (61). S3, adjust the nut on the adjusting bolt (5) to make the guide ring (2) horizontal, install the steel strand (6), use the second anchor (62) to anchor one end of the steel strand (6) to the guide ring (2), and pass the other end through the hole on the concrete beam (71). Use a small jack to tension the four steel strands (6) simultaneously until the predetermined load is reached, and then fix them with the first anchor (61). S4. After the later operation and maintenance is completed and put into use, if the prestress of the steel strand (6) loosens and the deflection of the floor slab (7) increases, the adjusting bolt (5) is rotated again to move the guide ring (2) down, so that the steel strand (6) is tensioned again to the design internal force value and then locked again.

9. A construction method for a multi-directional synchronous tensioning and adjustment system for reinforcing concrete floor slabs according to claim 8, characterized in that: S1 also includes applying structural adhesive to the contact areas of the fixing bolt (4), the upper end plate (12), the anchor plate (3) and the floor slab (7).

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