Construction method for repairing and strengthening concrete cap beam by bonding steel plates

Abstract

The present invention relates to a construction method for bonding steel plates to reinforce and repair concrete capping beams, which includes steps: installation of a suspended construction platform, grouting of capping beam cracks, installation of capping beam reinforcement steel plates, treatment of the broken ends of capping beams, and reinforcement of pier columns. The beneficial effects of the present invention are as follows: For the bonding of steel strips, a temporary auxiliary stabilizing hanger and a suspended construction platform are adopted. The auxiliary stabilizing hanger supports the capping beam reinforcement steel plate through the reserved connecting rod of the steel plate, and the suspended construction platform is fixed to the pier column through the platform hoop, improving the construction quality of steel plate bonding and thus enhancing the overall construction effect of capping beam reinforcement; on the precise lofting and guiding auxiliary device, there are auxiliary holes, and the anchor bolt holes are installed using the auxiliary holes on the precise lofting and guiding auxiliary device, improving the installation accuracy of the anchor bolts; for the broken part of the capping beam, the splicing and bonding steel reinforcement technology is adopted, and fiber concrete is poured through the capping beam splicing formwork, improving the integrity of capping beam reinforcement.

Description

Technical Field

[0001] The invention belongs to the field of bent cap repair construction, and particularly relates to a construction method for repairing a concrete bent cap by bonding steel plates for reinforcement. Background Art

[0002] At present, for the reinforcement of the bearing capacity of bridges, there are methods such as sticking carbon fiber, sticking steel plates, external prestressing, increasing the cross-section and changing the structural system. Among them, the method of bonding steel plates for reinforcement has the advantages of hardly increasing the dead load, convenient and fast construction, good reinforcement effect, etc., and is an ideal reinforcement method. The method of bonding steel plates uses an adhesive to bond steel plates on the surface of reinforced concrete members so that they act together to improve the overall flexural and shear strength and stiffness of the members and limit the further development of cracks, thereby achieving the purpose of reinforcement and strengthening.

[0003] The currently adopted construction method of bonding steel plates for reinforcement is relatively cumbersome in operation, and it is difficult to fix the steel plates during pasting; at the same time, there is no suitable operating platform during the reinforcement of bent caps, which leads to great construction difficulty and low construction safety. Moreover, it is difficult to accurately position the anchor bolt holes during the construction of the traditional construction method.

[0004] In view of the above problems, it is urgent to innovate the construction technology of bonding steel plates for reinforcement of bent caps on the basis of summarizing the traditional construction methods, and propose a construction method for repairing a concrete bent cap by bonding steel plates for reinforcement to improve the construction quality and construction efficiency of bent cap repair. Summary of the Invention

[0005] The purpose of the invention is to overcome the deficiencies in the prior art and provide a construction method for repairing a concrete bent cap by bonding steel plates for reinforcement.

[0006] This construction method for repairing a concrete bent cap by bonding steel plates for reinforcement includes the following steps:

[0007] Step 1: Installation of a hanging construction platform: First, set an anchor plate and a pre-embedded truss arc drag on the pier column, then install an angle steel diagonal brace, and install a platform cross beam on the angle steel diagonal brace. Then, install an inter-pier support truss in the pre-embedded truss arc drag, and successively install a large I-beam with grooves, a platform erection I-beam, and a small I-beam with grooves. Then, install a platform plate;

[0008] Step 2: Grouting of bent cap cracks: Pour cement mortar at the cracks of the bent cap; use the hanging construction platform to accurately lay out and fix the guiding auxiliary device on the bent cap, and complete the anchor bolt drilling through the auxiliary holes;

[0009] Step 3: Installation of bent cap reinforcement steel plates: Use the hanging construction platform to install pier column hoops, and successively install adjusting jacks and telescopic support cross bars. Adjust the length of the telescopic support cross bars, fix the rotatable L-shaped support rod on the steel plate reserved connecting rod on the bent cap reinforcement steel plate, and then install anchor bolts;

[0010] Step 4. Treatment of the broken end of the capping beam: Chisel the broken part of the capping beam, weld steel plates to connect the steel bars, bind the post-cast steel cage, install the capping beam splicing formwork, and pour fiber concrete; Remove the suspended construction platform and the auxiliary stabilizing hanger;

[0011] Step 5. Reinforcement of the pier column: Place the pier column reinforcement steel plate at the designed position on the pier column.

[0012] Preferably, in Step 1: The bottom of the suspended construction platform is fixed to the pier column through a platform hoop. The platform hoop is placed on the anchor plate, and anchor bars are provided on the anchor plate and implanted into the pier column. On one side of the platform hoop, a pre-embedded truss arc drag is provided, and on the other side, a channel-shaped anchor plate is provided. One side of the channel-shaped anchor plate is buried in the pier column through a channel-shaped anchor plate screw. An angle steel brace is provided on the channel-shaped anchor plate, and a stiffening channel steel is provided at the end of the angle steel brace. A platform cross beam is provided on the stiffening channel steel. On both sides of the platform hoop perpendicular to the platform cross beam, large I-beams with grooves are provided. The large I-beams with grooves are provided with I-beam grooves. A pier column intermediate support truss is provided on the pre-embedded truss arc drag. Platform erection I-beams and small I-beams with grooves are provided on the platform cross beam. Platform plates are provided on the large I-beams with grooves, the platform erection I-beams, and the small I-beams with grooves. End heads are provided at the ends of the platform plates and are embedded in the I-beam grooves. Platform guardrails are provided on the outer side of the platform plates.

[0013] Preferably, in Step 2: The precise lofting and guiding auxiliary device is provided with an end plate and auxiliary holes. The end plate is fixed to the capping beam by cement nails.

[0014] Preferably, in Step 3: The auxiliary stabilizing hanger is clamped to the pier column through a pier column hoop. An adjusting jack is provided on the pier column hoop. A telescopic support cross bar is provided on the adjusting jack. Rotatable L-shaped support rods are provided at both ends of the telescopic support cross bar. The rotatable L-shaped support rods are fixed to the capping beam reinforcement steel plate through a steel plate reserved connecting rod. The pier column hoop is composed of pieces and is connected through a hoop connecting plate.

[0015] Preferably, in Step 4: Steel plate reinforcement end plates are provided at both ends of the capping beam reinforcement steel plates on both sides of the broken part of the capping beam. First, weld steel plate connecting steel bars between the steel plate reinforcement end plates, then bind the post-cast steel cage, and set the post-cast steel cage through the steel plate connecting steel bars. Install the capping beam splicing formwork outside the post-cast steel cage. The upper part of the capping beam splicing formwork is connected to the capping beam reinforcement steel plate through the steel plate connecting steel bars. The lower part of the capping beam splicing formwork is connected to the capping beam through formwork fixing nails. Finally, pour fiber concrete, cure, remove the formwork, remove the suspended construction platform and the auxiliary stabilizing hanger, and chisel the embedded parts.

[0016] Preferably, a pier column reinforcement steel plate is provided on the pier column. A steel plate edge auxiliary plate is provided on the outer side of the pier column reinforcement steel plate, and a steel plate middle auxiliary plate is provided on the inner side. The steel plate edge auxiliary plate and the steel plate middle auxiliary plate are fixed to the pier column by cement nails. Step five is specifically as follows: First, drill anchor bolt holes in the pier column, then perform interface treatment and apply structural adhesive, place the pier column reinforcement steel plate at the designed position, fix one side of the pier column reinforcement steel plate through the steel plate edge auxiliary plate, and fix the other side through the steel plate middle auxiliary plate.

[0017] The concrete capping beam repaired by bonding steel plates is obtained by any of the above methods.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1) For the bonding of steel plates, a temporary auxiliary stable hanging bracket and a hanging construction platform are adopted. The auxiliary stable hanging bracket supports the capping beam reinforcement steel plate through the reserved connecting rod of the steel plate, and the hanging construction platform is fixed to the pier column through the platform hoop, which improves the construction quality of the steel plate bonding and thus improves the overall construction effect of the capping beam reinforcement.

[0020] 2) For precise lofting, the guiding auxiliary device is provided with auxiliary holes, and the anchor bolt holes are installed using the auxiliary holes on the guiding auxiliary device for precise lofting, which improves the installation accuracy of the anchor bolts.

[0021] 3) For the broken part of the capping beam, the splicing and bonding steel plate reinforcement technology is adopted, and fiber concrete is poured through the capping beam splicing formwork, which improves the integrity of the capping beam reinforcement and thus ensures the construction quality of the capping beam reinforcement. Description of the Drawings

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the schematic diagram of the temporary auxiliary stable hanging bracket;

[0024] Figure 3 is the connection schematic diagram of the hanging construction platform and the pier column;

[0025] Figure 4 is the structural schematic diagram of the hanging construction platform;

[0026] Figure 5 is the installation schematic diagram of the hanging construction platform board;

[0027] Figure 6 is the connection schematic diagram of the platform board and the large I-beam with grooves;

[0028] Figure 7 is the schematic diagram of the guiding auxiliary device for precise lofting of anchor bolt holes;

[0029] Figure 8 is the elevation schematic diagram of the pier column reinforcement;

[0030] Figure 9 It is a schematic plan view of pier column reinforcement;

[0031] Figure 10 It is a schematic diagram of temporary fixation of steel plates for pier column reinforcement;

[0032] Figure 11 It is a schematic diagram of reinforcement at the broken part of the capping beam;

[0033] Figure 12 It is a schematic diagram of the installation of the splicing formwork for the capping beam;

[0034] Figure 13 It is a plan view of the reinforcement at the broken part of the capping beam.

[0035] Among them: 1. Capping beam 2. Pier column 3. Pier column hoop 4. Telescopic support crossbar 5. Rotatable L-shaped support rod 6. Platform hoop 7. Anchor bar 8. Anchor plate 9. Support truss between pier columns 10. Platform crossbeam 11. Erected I-beam of the platform 12. Embedded truss arc drag 13. I-beam groove 14. Large I-beam with groove 15. Angle steel diagonal brace 16. Stiffening channel steel 17. Small I-beam with groove 18. Platform plate 19. Precise lofting and guiding auxiliary device. Cement nail 21. End plate 22. Auxiliary hole 23. Capping beam reinforcement steel plate 24. Pier column reinforcement steel plate 25. Steel plate edge auxiliary plate 26. Steel plate middle auxiliary plate 27. Steel plate reinforcement end plate 28. Broken part of the capping beam 29. Rear-connected steel reinforcement cage 30. Steel plate connecting steel bar 31. Formwork fixing nail 32. Capping beam splicing formwork 33. Steel plate reserved screw 34. Fiber concrete 35. Steel plate reserved connecting rod 36. Adjusting jack 37. Grooved anchor plate 38. Grooved anchor plate screw 39. Platform guardrail 40. Capping beam crack 41. Hoop connecting plate. Specific implementation method

[0036] The following further describes the present invention in combination with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for ordinary persons in the technical field, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0037] Embodiment 1

[0038] As an embodiment, a construction method for bonding steel plates to reinforce and repair a concrete capping beam includes the following steps:

[0039] Step 1. Installation of the suspended construction platform: First, set the anchor plate 8 and the anchoring system for embedding the truss arc drag 12 on the pier column 2, and the channel-shaped anchor plate 37. Then, install the angle steel brace 15 in the channel-shaped anchor plate 37, and install the stiffening channel steel 16 on the angle steel brace 15. Then, install the platform cross beam 10. Then, install the inter-pier support truss 9 in the embedded truss arc drag, and successively install the large I-beam with grooves 14, the platform erection I-beam 11, and the small I-beam with grooves 17. Then, install the platform plate 18.

[0040] Step 2. Grouting for the cracks in the capping beam: Pour the cement mortar at the cracks 40 of the capping beam.

[0041] Step 3. Drilling for the anchor bolts with guidance: Use the suspended construction platform to drill the anchor bolts. The end plate on the precise lofting and guiding auxiliary device 19 is fixed to the capping beam 1 with cement nails, and then the drilling construction is completed through the auxiliary holes.

[0042] Installation of the capping beam reinforcement steel plates: Use the suspended construction platform to install the pier column hoop 3, and install the adjusting jack 36. Then, install the telescopic support cross bar 4 and adjust its length. After applying the structural adhesive, fix the rotatable L-shaped support rod 5 to the steel plate reserved connecting rod 35 on the capping beam reinforcement steel plate 23 to temporarily fix the capping beam reinforcement steel plate, and then install the anchor bolts.

[0043] Step 4. Treatment of the broken end of the capping beam: First, chisel off part of the concrete at the broken part of the capping beam. The two ends of the capping beam reinforcement steel plates 23 on both sides of the broken part 28 of the capping beam are provided with steel plate reinforcement end plates 27. First, weld the steel plate connecting steel bars 30 between the two steel plate reinforcement end plates 27, then bind the post-cast reinforcement cage 29, and install the capping beam splicing formwork 32 on the outside. The capping beam splicing formwork 32 is fixed to the capping beam reinforcement steel plates 23 and the capping beam 1 respectively. Finally, pour the fiber concrete 34 and cure it and then remove the formwork.

[0044] Removal of the suspended construction platform and the auxiliary stabilizing hanging frame: Remove each component layer by layer and chisel off the embedded parts.

[0045] Step 5. Strengthening of the pier column: First, drill the anchor bolts, then conduct interface treatment and apply the structural adhesive, place the pier column reinforcement steel plate 24 at the designed position, fix one side of the pier column reinforcement steel plate 24 through the steel plate side auxiliary plate 25, and fix the other side through the steel plate middle auxiliary plate 26.

[0046] Embodiment 2

[0047] As another embodiment, the bonded steel reinforcement and repaired concrete capping beam obtained by the method proposed in Embodiment 1, such as Figures 1 to 13As shown in the figure, it includes a capping beam 1, a pier column 2, a drilling auxiliary plate, a capping beam crack 40, a capping beam reinforcement steel plate 23, a steel plate reinforcement end plate 27, a post-connected steel reinforcement cage 29 and a formwork fixing nail 31. It also includes an auxiliary stabilizing hanging bracket, a hanging construction platform and a precise lofting and guiding auxiliary device 19; a pier column reinforcement steel plate 24 is provided on the pier column 2;

[0048] As Figure 1 and Figure 2 shown in the figure, the auxiliary stabilizing hanging bracket includes a pier column hoop 3 and a telescopic support crossbar 4. The pier column hoop 3 is clamped on the pier column 2. The telescopic support crossbar 4 is arranged on the pier column hoop 3 through an adjusting jack 36. The telescopic support crossbar 4 supports the capping beam reinforcement steel plate 23 through a steel plate reserved connecting rod 35; the auxiliary stabilizing hanging bracket is clamped on the pier column 2 through the pier column hoop 3. An adjusting jack 36 is arranged on the pier column hoop 3. A telescopic support crossbar 4 is arranged on the adjusting jack 36. Rotatable L-shaped support rods 5 are arranged at both ends of the telescopic support crossbar 4. The rotatable L-shaped support rods 5 are temporarily fixed to the steel plate reserved connecting rod 35 on the capping beam reinforcement steel plate 23. Then the capping beam reinforcement steel plate 23 is installed. The pier column hoop 3 is composed of 2 pieces and is connected through a hoop connecting plate 41.

[0049] As Figures 1 to 6 shown in the figure, the hanging construction platform includes a platform hoop 6, a platform crossbeam 10 and a platform plate 18. The platform hoop 6 is fixed on the pier column 2. The platform crossbeam 10 is supported on the platform hoop 6 through an angle steel diagonal brace 15. The platform plate 18 is arranged on the platform crossbeam 10; the bottom of the hanging construction platform is fixed on the pier column 2 through the platform hoop 6. The platform hoop 6 is placed on an anchor plate 8. Anchor bars 7 are arranged on the anchor plate 8 and implanted into the pier column 2. A buried truss arc bracket 12 is arranged on one side of the platform hoop 6. A channel-shaped anchor plate 37 is arranged on one side. A channel-shaped anchor plate screw 38 is buried in the pier column 2 on one side of the channel-shaped anchor plate 37. An angle steel diagonal brace 15 is arranged on the channel-shaped anchor plate 37. A stiffening channel steel 16 is arranged at the end of the angle steel diagonal brace 15. Two platform crossbeams 10 are arranged on the stiffening channel steel 16. Banded grooved large I-beams 14 with I-beam grooves 13 are arranged on the other two sides of the platform hoop. A pier column intermediate support truss 9 is arranged on the buried truss arc bracket. Platform erection I-beams 11 and banded grooved small I-beams 17 are arranged on the platform crossbeam 10. The platform plate 18 is placed on the banded grooved large I-beams 14, the platform erection I-beams 11 and the banded grooved small I-beams 17. The end of the platform plate 18 is provided with a head, and the head is embedded in the I-beam groove 13. A platform guardrail 39 is arranged on the outside of the platform plate 18.

[0050] As Figure 7 shown in the figure, the precise lofting and guiding auxiliary device 19 is provided with an end plate 21 and an auxiliary hole 22. The precise lofting and guiding auxiliary device 19 is fixed on the capping beam 1 through the end plate 21 and a cement nail 20;

[0051] As Figures 11 to 13As shown in the figure, there is a broken pier cap area 28 on the pier cap 1. Steel plate connecting bars 30 and a post-connected reinforcement cage 29 are arranged between the pier cap reinforcement steel plates 23 on both sides of the broken pier cap area 28. A pier cap splicing formwork 32 is provided outside the post-connected reinforcement cage 29, and fiber concrete 34 is poured into the pier cap splicing formwork 32. Steel plate reinforcement end plates 27 are provided on the pier cap reinforcement steel plates 23 on both sides of the broken pier cap area 28, and steel plate reserved screw rods 33 are provided on the outside. Steel plate connecting bars 30 are arranged between the two steel plate reinforcement end plates 27, and the post-connected reinforcement cage 29 is arranged through the steel plate connecting bars 30. The pier cap splicing formwork 32 is arranged outside the post-connected reinforcement cage 29. The upper part of the pier cap splicing formwork 32 is connected to the pier cap reinforcement steel plate 23 through the steel plate connecting bars 30. The lower part of the pier cap splicing formwork 32 is connected to the pier cap 1 through formwork fixing nails 31, and fiber concrete 34 is arranged in the cavity.

[0052] As Figures 8 to 10 shown in the figure, pier cap reinforcement steel plates 24 are provided on the pier column 2. Steel plate side auxiliary plates 25 are provided outside the pier cap reinforcement steel plates 24, and steel plate middle auxiliary plates 26 are provided inside. The auxiliary plates are fixed to the pier column 2 with cement nails 20.

Claims

1. A construction method for strengthening and repairing a concrete bent cap by bonding steel plates, characterized in that It includes the following steps: Step 1. Installation of the suspended construction platform: First, set the anchor plate (8) and the embedded truss arc drag (12) on the pier column (2), then install the angle steel brace (15), and install the platform cross beam (10) on the angle steel brace (15). Then install the pier column between support truss (9) in the embedded truss arc drag (12), and successively install the large I-beam with groove (14), the platform erection I-beam (11) and the small I-beam with groove (17), and then install the platform plate (18). The bottom of the suspended construction platform is fixed on the pier column (2) through the platform hoop (6), the platform hoop (6) is placed on the anchor plate (8), the anchor plate (8) is provided with anchor bars (7), and the anchor bars (7) are implanted into the pier column (2). One side of the platform hoop (6) is provided with the embedded truss arc drag (12), and the other side is provided with a grooved anchor plate (37). One side of the grooved anchor plate (37) is buried on the pier column (2) through the grooved anchor plate screw (38). The grooved anchor plate (37) is provided with an angle steel brace (15), the end of the angle steel brace (15) is provided with a stiffening channel steel (16), and the stiffening channel steel (16) is provided with a platform cross beam (10). On both sides of the platform hoop (6) perpendicular to the platform cross beam (10), there are large I-beams with groove (14), and the large I-beams with groove (14) are provided with I-beam grooves (13). The embedded truss arc drag (12) is provided with a pier column between support truss (9), and the platform cross beam (10) is provided with a platform erection I-beam (11) and a small I-beam with groove (17). The large I-beam with groove (14), the platform erection I-beam (11) and the small I-beam with groove (17) are provided with a platform plate (18). The end of the platform plate (18) is provided with an end, and the end is embedded in the I-beam groove (13). The outside of the platform plate (18) is provided with a platform guardrail (39). Step 2. Grouting of the cap beam cracks: Pour cement mortar at the cap beam cracks (40). Using the suspended construction platform, the precise lofting and guiding auxiliary device (19) is fixed on the cap beam (1), and the anchor bolt drilling is completed through the auxiliary hole (22). The precise lofting and guiding auxiliary device (19) is provided with an end plate (21) and an auxiliary hole (22), and the end plate (21) is provided with cement nails (20) and fixed on the cap beam (1). Step 3. Installation of the cover beam reinforcement steel plates: Use a hanging construction platform to install the pier column hoop (3), and then sequentially install the adjusting jack (36) and the telescopic support crossbar (4). Adjust the length of the telescopic support crossbar (4), and fix the rotatable L-shaped support rod (5) on the steel plate reserved connecting rod (35) on the cover beam reinforcement steel plate (23). Then install the anchor bolts. The auxiliary stabilizing hanger includes the pier column hoop (3) and the telescopic support crossbar (4). The auxiliary stabilizing hanger is clamped on the pier column (2) through the pier column hoop (3). An adjusting jack (36) is provided on the pier column hoop (3), and a telescopic support crossbar (4) is provided on the adjusting jack (36). Rotatable L-shaped support rods (5) are provided at both ends of the telescopic support crossbar (4). The rotatable L-shaped support rods (5) are fixed to the cover beam reinforcement steel plate (23) through the steel plate reserved connecting rods (35). The pier column hoop (3) consists of 2 pieces and is connected through a hoop connecting plate (41). Step 4. Treatment of the broken end of the cover beam: Chisel the broken part (28) of the cover beam, weld the steel plate connecting reinforcement (30), bind the post-connected reinforcement cage (29), install the cover beam splicing formwork (32), and pour fiber concrete (34); Remove the hanging construction platform and the auxiliary stabilizing hanger. Step 5. Pier column reinforcement: Place the pier column reinforcement steel plate (24) at the designed position on the pier column (2).

2. The construction method of bonding steel to reinforce and repair a concrete bent cap according to claim 1, wherein, In Step 4: Steel plate reinforcement end plates (27) are provided at both ends of the cover beam reinforcement steel plates (23) on both sides of the broken part (28) of the cover beam. First, weld the steel plate connecting reinforcement (30) between the steel plate reinforcement end plates (27), then bind the post-connected reinforcement cage (29), and set the post-connected reinforcement cage (29) through the steel plate connecting reinforcement (30). Install the cover beam splicing formwork (32) outside the post-connected reinforcement cage (29). The upper part of the cover beam splicing formwork (32) is connected to the cover beam reinforcement steel plate (23) through the steel plate connecting reinforcement (30), and the lower part of the cover beam splicing formwork (32) is connected to the cover beam (1) through formwork fixing nails (31). Finally, pour fiber concrete (34), cure, remove the formwork, remove the hanging construction platform and the auxiliary stabilizing hanger, and chisel the embedded parts.

3. The construction method of sticking steel for strengthening and repairing concrete capping beams according to claim 1, characterized in that: The pier column (2) is provided with a pier column reinforcement steel plate (24). A steel plate side auxiliary plate (25) is provided outside the pier column reinforcement steel plate (24), and a steel plate middle auxiliary plate (26) is provided inside. The steel plate side auxiliary plate (25) and the steel plate middle auxiliary plate (26) are fixed to the pier column (2) by cement nails (20). Step 5 is specifically as follows: First, drill anchor bolt holes in the pier column (2), then perform interface treatment and apply structural adhesive. Place the pier column reinforcement steel plate (24) at the designed position. One side of the pier column reinforcement steel plate (24) is fixed by the steel plate side auxiliary plate (25), and the other side is fixed by the steel plate middle auxiliary plate (26).

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