A reinforcing device and method for a fabricated concrete structure against blast load action

Abstract

The application provides an assembled concrete structure reinforcing device and method against explosion load, and relates to the technical field of structure explosion resistance. The reinforcing device comprises a steel plate reinforced concrete prefabricated beam and a steel plate reinforced concrete prefabricated column. The steel plate reinforced concrete prefabricated beam comprises prefabricated concrete, embedded steel bars, opposite-pulling screw rods and upper and / or lower reinforcing angle steels. The prefabricated concrete and the steel bars bear the upper load. The opposite-pulling screw rods penetrate the prefabricated concrete in the height direction, and the screw rod ends are fixed to the upper and lower reinforcing angle steels, respectively. The steel plate reinforced concrete prefabricated column comprises prefabricated concrete, embedded steel bars, grouting sleeves and an outer steel cylinder. The outer steel cylinder is provided with the steel bars and the grouting sleeves and is filled with the concrete. The prefabricated column and the prefabricated beam are connected through a beam-column joint cast-in-place layer and a beam cast-in-place layer. The application can effectively reduce the damage of the building structure in the explosion and improve the safety performance of the building structure.

Description

Technical Field

[0001] This invention relates to the field of structural blast resistance technology, and more specifically, to a prefabricated concrete structure reinforcement device and method for resisting blast loads. Background Technology

[0002] Currently, to improve the safety performance of reinforced concrete structures under explosive loads, a series of blast-resistant reinforcement measures, such as the use of fiber-reinforced composite materials and polyurea, have been applied in actual reinforced concrete structure projects. However, a comprehensive and targeted blast-resistant reinforcement system is still lacking for the increasingly popular prefabricated concrete structures.

[0003] To improve the blast resistance of structures, Chinese invention patent application CN118087692A, entitled "A Prefabricated Tough Blast-Resistant Structure and Its Manufacturing and Installation Method," discloses the following: Utilizing the shear energy dissipation capacity of energy-dissipating supports, the energy absorption capacity and repairability of polyurethane foam, the yield energy dissipation capacity of metal energy-dissipating bonds, and the internal disassembly and replacement of individual protective panels, tough blast resistance is achieved as a key objective. However, this method is complex and costly, making it difficult to apply to large-scale civil structures. Therefore, it is necessary to propose an additional, low-cost, and convenient blast-resistant reinforcement system based on conventional prefabricated concrete structure design and construction methods. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated concrete structure reinforcement device and method that resists explosion loads, so as to effectively reduce the damage to the structure after an explosion.

[0005] To achieve the above objectives, the present invention provides a prefabricated concrete structure reinforcement device resistant to explosive loads, comprising: a steel plate reinforced precast concrete beam (1), a steel plate reinforced precast concrete column (2), a cast-in-place beam layer (4), and a cast-in-place beam-column joint layer (5); wherein, The steel plate reinforced concrete precast beam (1) includes: beam concrete (11), multiple beam embedded steel bars (12) tied together and penetrating the beam concrete (11) in the horizontal and vertical directions, at least one tie rod (13) penetrating the beam concrete (11) in the vertical direction, and upper reinforcing angle steel (14) fixed to the upper end of each tie rod (13) and / or lower reinforcing angle steel (15) fixed to the lower end of each tie rod (13). The steel plate reinforced concrete precast column (2) includes: column concrete (21), multiple column embedded steel bars (22) that penetrate the column concrete (21) along the height direction, column grouting sleeve (23), outer steel cylinder (24) and post-cast layer sealing steel cylinder (25); during on-site installation, the steel plate reinforced concrete precast column (2) is fixed to the ground, and grouting material is injected into the grouting sleeve (23) through the reserved hole of the outer steel cylinder (24). Part of the grouting material flows into the sealed area formed by the post-cast layer sealing steel cylinder (25) as the post-cast layer; The steel plate reinforced concrete precast column (2) supports the steel plate reinforced concrete precast beam (1) on the upper part and is connected by the beam-column joint cast-in-place layer (5) poured on the upper part of the steel plate reinforced concrete precast column (2); the beam cast-in-place layer (4) is poured on the upper part of the steel plate reinforced concrete precast beam (1) and its end is connected to the beam-column joint cast-in-place layer (5).

[0006] Furthermore, stiffening ribs (16) are welded to the inner sides of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15).

[0007] Furthermore, node welding plates (17) are welded to the ends of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15). During on-site installation, the node welding plates (17) are welded to the outer steel cylinder (24).

[0008] Furthermore, the tie rod (13) is fixedly connected to the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15) by welding or bolting.

[0009] Furthermore, for the standard layer of the structure, the upper end of each tie rod (13) is fixed with an upper reinforcing angle steel (14), and the lower end is fixed with a lower reinforcing angle steel (15); for the top layer of the structure, the upper end of each tie rod (13) is fixed with an upper reinforcing steel plate (18), and the lower end is fixed with a lower reinforcing angle steel (15).

[0010] Furthermore, the precast partition wall panel (3) is embedded in the frame formed by the steel plate reinforced concrete precast beam (1) and the steel plate reinforced concrete precast column (2).

[0011] Furthermore, for layers that do not require filling with prefabricated partition boards (3), the upper end of each tie rod (13) is fixed with an upper reinforcing angle steel (14), and the lower end is fixed with a lower reinforcing steel plate (19).

[0012] This invention also provides a method for strengthening prefabricated concrete structures to resist blast loads, comprising the following steps: Step 1: Reinforce the precast concrete beam with precast steel plates at the precast plant (1): Step 11, tie the reinforcing bars of multiple beams (12); Step 12, position at least one tie rod (13); Step 13, fix a reinforcing angle steel (14) to the upper part of each tie rod (13) and / or fix a lower reinforcing angle steel (15) to the lower part of each tie rod (13). Step 14: Cast the formwork and pour the concrete for the beam (11) and then perform standard curing at the factory; Step 2, reinforce the precast concrete column with precast steel plates in the precast plant (2): Step 21: Tie multiple column embedded steel bars (22) and install column grouting sleeves 23; Step 22: Use the outer steel cylinder (24) and the post-cast layer sealing steel cylinder (25) as templates to pour column concrete (21); Step 3, on-site installation: Step 31: Fix the steel plate reinforced concrete precast column (2) to the ground; Step 32: Grouting material is injected into the grouting sleeve (23) through the reserved hole in the outer steel cylinder (24). Part of the grouting material flows into the sealed area formed by the post-cast layer sealing steel cylinder (25) as the post-cast layer. Step 33: Position and install the steel plate reinforced precast concrete beam (1), with the lower part of the beam concrete (11) flush with the upper part of the column concrete (21); Step 34: Cast the beam cast-in-place layer (4) and the beam-column joint cast-in-place layer (5) using formwork. Wait until the beam cast-in-place layer (4) and the beam-column joint cast-in-place layer (5) have finished curing and reached the design strength.

[0013] Furthermore, in step 1, after step 13 and before step 14, the steps include: welding stiffening ribs (16) to the inside of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15), and welding node plates (17) to the ends of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15).

[0014] Furthermore, step 33 also includes: the node welding plate (17) abutting against the outer steel cylinder (24); step 3 also includes step 35, welding the node welding plate (17) and the outer steel cylinder (24).

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The explosion-proof reinforcement component of the present invention is easy to install, which can improve the construction efficiency of structures requiring reinforcement; 2. With the reinforcement of tie bolts and angle steel, the precast beams and cast-in-place parts of the present invention are less prone to delamination, thus improving the overall blast resistance of the frame beams; 3. The reinforcing angle steel of the present invention can improve the end restraint of the inner and outer wall panels and enhance the explosion resistance of the infill wall; 4. The precast columns of the present invention, reinforced by the outer steel plate, improve the overall blast resistance of the frame columns; 5. The precast beams and columns of the present invention have improved overall blast resistance due to the reinforcement of steel plate welding. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall reinforcement system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall reinforcement system after removing the cast-in-place layer according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a steel plate reinforced precast concrete beam structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a steel plate reinforced precast concrete column structure according to an embodiment of the present invention; Figure 5 Embodiments of the present invention Figure 3 Enlarged view of tie rod and angle steel; Figure 6 This is an enlarged view of the beam-column joint in an embodiment of the present invention.

[0018] The reference numerals in the accompanying drawings include: 1. Steel plate reinforced precast concrete beam; 2. Steel plate reinforced precast concrete column; 3. Precast partition wall panel; 4. Cast-in-place beam layer; 5. Cast-in-place beam-column joint layer; 11. Beam concrete; 12. Beam embedded steel reinforcement; 13. Tie rod; 14. Upper reinforcing angle steel; 15. Lower reinforcing angle steel; 16. Angle steel stiffening rib; 17. Joint welded plate; 18. Upper reinforcing steel plate; 19. Lower reinforcing steel plate; 21. Column concrete; 22. Column embedded steel reinforcement; 23. Column grouting sleeve; 24. Outer steel cylinder; 25. Post-cast layer sealing steel cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-6 As shown, the prefabricated concrete structure reinforcement device for resisting explosion loads of the present invention includes a prefabricated concrete beam 1 reinforced with steel plate and a prefabricated concrete column 2 reinforced with steel plate.

[0021] Steel plate reinforced precast concrete column 2 is fixed to the ground, supporting steel plate reinforced precast concrete beam 1 on top, and connected through beam-column joint cast-in-place layer 5. Furthermore, beam cast-in-place layer 4 is cast above steel plate reinforced precast concrete beam 1, with its ends connected to beam-column joint cast-in-place layer 5. Precast partition wall panel 3 is embedded within the frame formed by steel plate reinforced precast concrete beam 1 and steel plate reinforced precast concrete column 2.

[0022] For the standard floor of the structure, the steel plate reinforced concrete precast beam 1 includes beam concrete 11, beam embedded steel bars 12, tie rods 13, upper reinforcing angle steel 14, lower reinforcing angle steel 15, angle steel stiffening ribs 16, and node welded plates 17. In the prefabrication plant, the beam embedded steel bars 12 are first tied, the tie rods 13 are positioned, and the upper reinforcing angle steel 14 and lower reinforcing angle steel 15 are welded to the upper and lower ends of the tie rods, respectively. After the angle steel welding is completed, to improve the strength of the angle steel, angle steel stiffening ribs 16 are welded to the inside of the angle steel, and a square node welded plate 17 is welded to each end of the upper and lower angle steel. Finally, the beam concrete 11 is poured and cured according to standard conditions in the factory. For the top floor of the structure, the upper reinforcing angle steel 14 is replaced with an upper reinforcing steel plate 18; for underground parking garages or other spaces without infill walls, the lower reinforcing angle steel 15 is replaced with a lower reinforcing steel plate 19.

[0023] Multiple tie rods penetrate the precast concrete section along its height, with the ends of the rods welded or bolted to the upper and lower reinforcing angle steels, respectively. The diameter of the tie rods is not less than 8mm, and the spacing between adjacent tie rods is not greater than 500mm.

[0024] For the standard structural floor, reinforced angle steel is used in both the upper and lower parts, and steel stiffening ribs are set on the inner side of the angle steel, with the spacing between adjacent stiffening ribs not exceeding 500mm.

[0025] A square steel node welding plate is welded to each end of the reinforcing angle steel. The welding plate is parallel to the stiffening rib and the thickness of the welding plate is not less than 10mm.

[0026] The steel plate reinforced precast concrete column 2 includes column concrete 21, column embedded steel bars 22, column grouting sleeve 23, outer steel cylinder 24, and post-cast layer sealing steel cylinder 25. In the prefabrication plant, the column embedded steel bars 22 are first tied, and the column grouting sleeve 23 is installed. Subsequently, the outer steel cylinder 24 and the post-cast layer sealing steel cylinder 25 are used as formwork to pour the column concrete 21.

[0027] Precast beams and columns are connected by welding and then by cast-in-place concrete. The end joints of the upper and lower angle steel of the precast beams are welded to the sides of the outer steel cylinder of the precast columns. The precast beam and column joints are supported by formwork and cast-in-place concrete using conventional methods.

[0028] During on-site installation, after the steel plate reinforced concrete precast column 2 is positioned, grout is injected into the grouting sleeve 23 through the reserved holes in the outer steel cylinder 24. Part of the grout flows into the sealed area formed by the post-cast layer sealing steel cylinder 25 as the post-cast layer. Subsequently, the steel plate reinforced concrete precast beam 1 is positioned and installed, with the lower part of the beam concrete 11 flush with the upper part of the column concrete 21, and the node welding plate 17 abutting against the outer steel cylinder 24.

[0029] Further, formwork is erected and the cast-in-place beam layer 4 and beam-column joint layer 5 are poured. After the cast-in-place layer has cured to the design strength, the joint welding plate 17 and the outer steel cylinder 24 are welded, and the prefabricated partition wall panel 3 is installed in the groove formed by the upper reinforcing angle steel 14, the lower reinforcing angle steel 15, and the angle steel stiffening rib 16.

[0030] The reinforcement principle of this invention lies in the fact that there is a joint surface between the precast beam and the cast-in-place layer in prefabricated concrete structures. This location is a weak point under explosive forces and is prone to separation. This invention improves the integrity of the joint surface by using upper and lower reinforcing angle steel and tie bolts to form upper and lower constraints, which helps to reduce tensile failure at this location and improves the blast resistance of the frame beam. Simultaneously, since the upper and lower reinforcing angle steel and tie bolts are pre-embedded in the frame beam, they are not easily pulled out under strong dynamic loads from an explosion. Therefore, installing precast wall panels at the angle steel locations provides reliable end constraints, preventing the wall panel ends from directly detaching and flying outwards. Furthermore, as the most important load-bearing component of the structure, the precast column is additionally reinforced by steel cylinders around its perimeter, increasing its lateral resistance and improving the compressive strength of the internal concrete, thereby enhancing the blast resistance of the precast column. In addition, extending the lower part of the steel cylinders can be used to seal the perimeter of the post-grouting layer.

[0031] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated concrete structure reinforcement device resistant to blast loads, characterized in that, The device includes: a steel plate reinforced precast concrete beam (1), a steel plate reinforced precast concrete column (2), a cast-in-place beam layer (4), and a cast-in-place beam-column joint layer (5); wherein, The steel plate reinforced concrete precast beam (1) includes: beam concrete (11), multiple beam embedded steel bars (12) tied together and penetrating the beam concrete (11) in the horizontal and vertical directions, at least one tie rod (13) penetrating the beam concrete (11) in the vertical direction, and upper reinforcing angle steel (14) fixed to the upper end of each tie rod (13) and / or lower reinforcing angle steel (15) fixed to the lower end of each tie rod (13). The steel plate reinforced concrete precast column (2) includes: column concrete (21), multiple column embedded steel bars (22) that penetrate the column concrete (21) along the height direction, column grouting sleeve (23), outer steel cylinder (24) and post-cast layer sealing steel cylinder (25); during on-site installation, the steel plate reinforced concrete precast column (2) is fixed to the ground, and grouting material is injected into the grouting sleeve (23) through the reserved hole of the outer steel cylinder (24). Part of the grouting material flows into the sealed area formed by the post-cast layer sealing steel cylinder (25) as the post-cast layer; The steel plate reinforced concrete precast column (2) supports the steel plate reinforced concrete precast beam (1) on the upper part and is connected by the beam-column joint cast-in-place layer (5) poured on the upper part of the steel plate reinforced concrete precast column (2); the beam cast-in-place layer (4) is poured on the upper part of the steel plate reinforced concrete precast beam (1) and its end is connected to the beam-column joint cast-in-place layer (5).

2. The reinforcement device as described in claim 1, characterized in that, Stiffening ribs (16) are welded to the inside of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15).

3. The reinforcement device as described in claim 1, characterized in that, Node welding plates (17) are welded to the ends of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15). During on-site installation, the node welding plates (17) are welded to the outer steel cylinder (24).

4. The reinforcement device as described in claim 1, characterized in that, The tie rod (13) is fixedly connected to the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15) by welding or bolting.

5. The reinforcement device as described in claim 1, characterized in that, For the standard layer of the structure, the upper end of each tie rod (13) is fixed with an upper reinforcing angle steel (14), and the lower end is fixed with a lower reinforcing angle steel (15); for the top layer of the structure, the upper end of each tie rod (13) is fixed with an upper reinforcing steel plate (18), and the lower end is fixed with a lower reinforcing angle steel (15).

6. The reinforcement device according to any one of claims 1-5, characterized in that, The precast partition wall panel (3) is embedded in the frame formed by the steel plate reinforced concrete precast beam (1) and the steel plate reinforced concrete precast column (2).

7. The reinforcement device as described in claim 1, characterized in that, For layers that do not require filling with precast partition panels (3), the upper end of each tie rod (13) is fixed with an upper reinforcing angle steel (14), and the lower end is fixed with a lower reinforcing steel plate (19).

8. A method for strengthening prefabricated concrete structures to resist blast loads, characterized in that, The method includes the following steps: Step 1: Reinforce the precast concrete beam with precast steel plates at the precast plant (1): Step 11, tie the reinforcing bars of multiple beams (12); Step 12, position at least one tie rod (13); Step 13, fix a reinforcing angle steel (14) to the upper part of each tie rod (13) and / or fix a lower reinforcing angle steel (15) to the lower part of each tie rod (13). Step 14: Cast the formwork and pour the concrete for the beam (11) and then perform standard curing at the factory; Step 2, reinforce the precast concrete column with precast steel plates in the precast plant (2): Step 21: Tie multiple column embedded steel bars (22) and install column grouting sleeves 23; Step 22: Use the outer steel cylinder (24) and the post-cast layer sealing steel cylinder (25) as templates to pour column concrete (21); Step 3, on-site installation: Step 31: Fix the steel plate reinforced concrete precast column (2) to the ground; Step 32: Grouting material is injected into the grouting sleeve (23) through the reserved hole in the outer steel cylinder (24). Part of the grouting material flows into the sealed area formed by the post-cast layer sealing steel cylinder (25) as the post-cast layer. Step 33: Position and install the steel plate reinforced precast concrete beam (1), with the lower part of the beam concrete (11) flush with the upper part of the column concrete (21); Step 34: Cast the beam cast-in-place layer (4) and the beam-column joint cast-in-place layer (5) using formwork. Wait until the beam cast-in-place layer (4) and the beam-column joint cast-in-place layer (5) have finished curing and reached the design strength.

9. The method as described in claim 8, characterized in that, In step 1, after step 13 and before step 14, the following steps are also included: welding stiffening ribs (16) to the inside of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15), and welding node welding plates (17) to the ends of the upper reinforcing angle steel (14) and the lower reinforcing angle steel (15).

10. The method as described in claim 9, characterized in that, Step 33 further includes: the node welding plate (17) abutting against the outer steel cylinder (24); Step 3 further includes step 35, welding the node welding plate (17) and the outer steel cylinder (24).

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