Prestressed pec steel frame beam connecting joint structure and method

Abstract

This invention discloses a construction method for a prestressed PEC steel frame beam connection node, specifically relating to the field of prefabricated buildings. The construction of this prestressed PEC steel frame beam connection node includes a prefabricated PEC frame beam and a PEC column. The PEC frame beam and the PEC column are connected by high-strength bolts. PEC beam lifting components are provided at the flanges of the PEC frame beam. In this invention, steel strands are combined with the PEC structure. The presence of steel strands greatly reduces the deflection value of large-span PEC frame beams. Under the premise of the same load-bearing capacity, the beam-column joint size is smaller, saving construction costs. While ensuring that the load-bearing capacity of the components is not weakened and the connection workload in the joint area is not increased, the ability of the beam-column joint area to resist bending moments is enhanced, meeting the requirement of strong joints and weak components.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and in particular to a construction method for a prestressed PEC steel frame beam connection node. Background Technology

[0002] Partially Encased Composite Structure (PEC structure) is a new type of steel-concrete composite structure formed by welding steel bars or studs into an H-shaped steel cavity and then pouring concrete. Due to its excellent seismic resistance, fire resistance, and corrosion resistance, it has been widely used in prefabricated steel structure housing. However, as building structures become wider, the cross-sections of structural members are no longer controlled by strength but by crack and deflection. Simply increasing the cross-section of structural members to meet crack and deflection requirements is extremely unreasonable and uneconomical. Furthermore, due to the presence of encased concrete, PEC structural members are heavier than traditional steel structural members, further limiting the application of PEC structures in large spans and large spaces.

[0003] In order to reduce the self-weight of PEC structural components in large-span, large-space buildings, improve the rationality and economy of PEC structures in large-span, large-space buildings, and further broaden the application scope of PEC structures in the construction field, there is an urgent need for a new construction measure for PEC structural connection nodes suitable for large-span, large-space buildings. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of current structural systems and to improve the rationality and economy of using PEC structural components in large-span, large-space buildings by comprehensively considering factors such as prefabricated component production and on-site installation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A prestressed PEC steel frame beam connection joint structure includes a precast PEC frame beam and a PEC column. The PEC frame beam and PEC column are connected by high-strength bolts. A PEC beam lifting device is installed at the flange of the PEC frame beam. The PEC beam lifting device is connected to a pre-embedded threaded sleeve inside the PEC frame beam by bolts and washers. The beam-column joint of the PEC frame beam is filled with concrete. A pre-embedded corrugated metal pipe is embedded within the concrete-covered portion of the PEC frame beam. The embedded metal corrugated pipe is connected to the subsequent metal corrugated pipe. The vertical partitions, end plates, and beam-column flanges of the PEC frame beam are all provided with metal corrugated pipe through holes. The diameter of the pre-set metal corrugated pipe through holes is larger than the diameter of the pre-embedded metal corrugated pipe. A steel strand tensioning groove is provided at the top of the PEC frame beam. A tensioning end anchor is fixedly installed on the steel strand tensioning groove. The tensioning end anchor is sealed on the steel strand tensioning groove by a tensioning cover plate. The tensioning groove cover plate is welded and fixed to the PEC frame beam. An opening is provided on the tensioning groove cover plate.

[0007] Preferably, the method for constructing the connection node of the prestressed PEC steel frame beam is as follows:

[0008] During the production of S1 and PEC frame beams, metal corrugated pipes are pre-embedded within the area covered by concrete, and extend a certain length beyond the area of ​​the subsequently poured concrete for on-site connection with the subsequent metal corrugated pipes.

[0009] The vertical diaphragms, end plates, and beam-column flanges of the S2 and PEC frame beams are all pre-drilled with holes for corrugated metal pipes. The factory precisely drills holes in the corresponding steel components according to the shape of the prestressed steel strands, and the diameter of the pre-embedded holes is slightly larger than the diameter of the corrugated metal pipe.

[0010] S3. When the pre-embedded metal corrugated pipe passes through the pre-reserved holes in the vertical diaphragm, end plate and beam-column flange of the PEC frame beam, a sealing ring should be installed at the perforation position of the metal corrugated pipe. The inner diameter of the sealing ring is slightly smaller than the outer diameter of the metal corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-embedded hole.

[0011] S4. The horizontal studs connected to the web of the steel beam serve both as connectors that enhance the combined effect between the concrete and steel structural components, and as fasteners for the pre-embedded corrugated metal pipes within the concrete enclosure of the PEC frame beam.

[0012] S5. When hoisting the precast PEC frame beam, the beam is lifted and installed using the PEC beam hoisting component at the upper flange of the beam. The PEC frame beam is connected to the PEC column by high-strength bolts.

[0013] S6. After the component is hoisted into place, the pre-embedded metal corrugated pipe is connected to the subsequent metal corrugated pipe. The pre-embedded metal corrugated pipe is inserted into the subsequent metal corrugated pipe, and the end of the pre-embedded metal corrugated pipe is equipped with a sealing ring. The junction of the pre-embedded metal corrugated pipe and the subsequent metal corrugated pipe is wrapped with sealing tape.

[0014] S7. After the metal corrugated pipe is connected, pour the concrete in the post-cast area of ​​the beam-column joint, thread steel strands through the metal corrugated pipe, use the PEC beam hoisting component as the fixing component of the tensioning jack to tension the steel strands, and inject grout into the metal corrugated pipe.

[0015] S8. After the steel strand tensioning is completed, the tensioning end anchor is installed in the steel strand tensioning groove, and the beam tensioning groove cover plate is welded to the PEC frame beam with bevel welding to seal the steel strand tensioning groove once. The tensioning groove has a reserved opening so that concrete can flow into the tensioning groove when the floor slab concrete is poured, and the tensioning end anchor is permanently sealed.

[0016] S9. Disassemble the PEC beam hoisting components and screw the vertical anchor bolts of the PEC frame beam into the pre-embedded nut sleeves to achieve the fixed connection of the vertical studs in this part.

[0017] S10. Lay the floor deck and pour the floor concrete.

[0018] Preferably, the pre-embedded metal corrugated pipes embedded within the concrete covering area of ​​the precast PEC frame beam extend a certain length within the subsequent concrete pouring area for on-site connection with subsequent metal corrugated pipes.

[0019] Preferably, in step S3, the tensioning and fixing end of the precast PEC frame beam steel strand is set at the upper flange of the opposite side precast PEC frame beam. The corresponding post-connected metal corrugated pipe of the precast PEC frame beam on this side passes through the tensioning groove at the upper flange of the opposite side PEC frame beam, through the vertical partition, end plate and PEC column flange of the opposite side PEC frame beam respectively, and is connected with the pre-embedded metal corrugated pipe of the PEC frame beam on this side within the post-cast concrete range of the PEC column, so as to realize the connection of the prestressed steel strand metal corrugated pipe.

[0020] The above technical solution is adopted: the inner diameter of the sealing ring is slightly smaller than the outer diameter of the metal corrugated pipe to ensure that the sealing ring firmly wraps the corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-embedded hole to ensure the sealing effect of the sealing ring on the pre-embedded hole and avoid concrete leakage, which could cause quality problems.

[0021] Preferably, in step S6, the inner diameter of the sealing ring is the same as the diameter of the pre-embedded metal corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-embedded metal corrugated pipe but slightly smaller than the diameter of the subsequent metal corrugated pipe.

[0022] The above technical solution is adopted: the outer diameter of the sealing ring is larger than the diameter of the pre-embedded metal corrugated pipe and slightly smaller than the diameter of the subsequent metal corrugated pipe, so as to ensure the airtightness of the internal cavity of the metal corrugated pipe and prevent concrete slurry from seeping into the inside of the metal corrugated pipe and causing blockage of the internal pipe.

[0023] Preferably, in step S5, the specifications and quantity of high-strength bolts are determined by calculation, and the core area of ​​the beam-column joint is formed on-site and concrete is poured.

[0024] Preferably, the position of the horizontal stud in step S4 is determined according to the shape of the steel strand and is precisely positioned in the factory.

[0025] The beneficial effects of this invention are as follows:

[0026] In this invention, steel strands are combined with PEC structures. The presence of steel strands greatly reduces the deflection value of large-span PEC frame beams. Under the premise of the same bearing capacity, the beam node size is smaller, saving construction costs. While ensuring that the bearing capacity of the components is not weakened and the connection workload of the node area is not increased, the ability of the beam-column node area to resist bending moment is enhanced, meeting the requirements of strong nodes and weak components.

[0027] The construction measures of reserving openings at the connection points of the metal corrugated pipe in this invention, in the vertical diaphragms, end plates, and flanges of the PEC frame beams, lay a good foundation for the subsequent tensioning of steel strands. The dual-purpose and detachable nature of the PEC beam hoisting components provides convenience for component hoisting and prestressing tensioning. Attached Figure Description

[0028] Figure 1 A schematic diagram of the connection node of the prestressed PEC frame beam provided by the present invention;

[0029] Figure 2 This is a schematic diagram of a typical PEC beam cross-section in this invention;

[0030] Figure 3 A schematic diagram of the concrete covering the connection node of the prestressed PEC frame beam provided by the present invention;

[0031] Figure 4 A schematic diagram of the vertical stiffening plate for the connection node of the prestressed PEC frame beam provided by the present invention;

[0032] Figure 5 A schematic diagram of the anti-seepage structure for a metal corrugated pipe passing through a reserved hole, provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the horizontal stud arrangement of a PEC beam provided by the present invention;

[0034] Figure 7 The metal bellows arrangement surface of the horizontal studs for PEC beams provided by the present invention;

[0035] Figure 8 This is a schematic diagram of the installation of the PEC beam hoisting component provided by the present invention;

[0036] Figure 9 This is a structural schematic diagram of the PEC beam hoisting component provided by the present invention;

[0037] Figure 10 This is a schematic diagram of the lifting hole structure of the PEC beam lifting component provided by the present invention;

[0038] Figure 11 A schematic diagram of the stiffening plate structure of the PEC beam hoisting component provided by the present invention;

[0039] Figure 12 A schematic diagram showing the connection between the pre-embedded metal corrugated pipe and the subsequent metal corrugated pipe provided by the present invention.

[0040] Figure 13 A schematic diagram of steel strand tensioning provided by the present invention;

[0041] Figure 14 This is a schematic diagram of the structure and connection of the tensioning groove cover plate provided by the present invention;

[0042] Figure 15 This is a schematic diagram of the vertical stud connection of a partial PEC beam provided by the present invention. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0044] like Figure 1-15 As shown, a prestressed PEC steel frame beam connection node structure includes a precast PEC frame beam and a PEC column. The PEC frame beam and PEC column are connected by high-strength bolts. A PEC beam lifting device is provided at the flange of the PEC frame beam. The PEC beam lifting device is connected to a pre-embedded threaded sleeve in the PEC frame beam by bolts and washers. The beam-column joint of the PEC frame beam is filled with concrete, and a pre-embedded metal corrugated core is embedded in the concrete-covered portion of the PEC frame beam. Corrugated pipes are pre-embedded and connected to subsequent corrugated pipes. Corrugated pipe holes are provided at the vertical diaphragms, end plates, and beam-column flanges of the PEC frame beam. The diameter of the pre-embedded corrugated pipe holes is larger than the diameter of the pre-embedded corrugated pipe. A steel strand tensioning groove is provided at the top of the PEC frame beam. Tensioning end anchors are fixedly installed on the steel strand tensioning groove. The tensioning end anchors are sealed on the steel strand tensioning groove by a tensioning cover plate. The tensioning groove cover plate is welded and fixed to the PEC frame beam. An opening is provided on the tensioning groove cover plate.

[0045] Preferably, the method for constructing the connection node of the prestressed PEC steel frame beam is as follows:

[0046] S1 and PEC frame beams are manufactured with corrugated metal pipes pre-embedded within the concrete covering area, extending a certain length beyond the subsequently poured concrete area for on-site connection to additional corrugated metal pipes. Figure 2 As shown;

[0047] For S2 and PEC frame beams, pre-drilled holes for corrugated metal pipes are drilled in the vertical diaphragms, end plates, and beam-column flanges. The factory precisely drills these holes in the corresponding steel components according to the shape of the prestressed steel strands, with the diameter of the pre-embedded holes slightly larger than the diameter of the corrugated metal pipe. Figure 3 as well as Figure 4 As shown;

[0048] S3. When pre-embedded corrugated metal pipes pass through pre-reserved holes in the vertical diaphragms, end plates, and beam-column flanges of PEC frame beams, sealing rings should be installed at the perforation locations of the corrugated metal pipes. The inner diameter of the sealing rings should be slightly smaller than the outer diameter of the corrugated metal pipes, and the outer diameter of the sealing rings should be larger than the diameter of the pre-embedded holes. The tensioning and fixing ends of the precast PEC frame beam steel strands should be set at the upper flange of the opposite side of the precast PEC frame beam. The corresponding subsequent corrugated metal pipes of the precast PEC frame beams on this side should be tensioned from the upper flange of the opposite side of the PEC frame beam. The grooves pass through the vertical diaphragms, end plates, and PEC column flanges of the opposite PEC frame beams, connecting with the pre-embedded corrugated metal pipes of the PEC frame beams on this side within the post-cast concrete area of ​​the PEC column. This achieves connection between the prestressed steel strand corrugated metal pipes. The inner diameter of the sealing ring is slightly smaller than the outer diameter of the corrugated metal pipe to ensure a secure wrapping. The outer diameter of the sealing ring is larger than the diameter of the pre-embedded hole to ensure effective sealing and prevent concrete leakage, thus avoiding quality problems. Figure 5 As shown;

[0049] S4. The horizontal studs connecting to the web of the steel beam serve both as connectors to enhance the combined effect between the concrete and steel structural components, and as fasteners for the pre-embedded corrugated metal pipes within the concrete enclosure of the PEC frame beam. The position of the horizontal studs is determined according to the shape of the steel strands and is precisely positioned during factory processing. Figure 6 , Figure 7 As shown;

[0050] S5. During the hoisting of precast PEC frame beams, the beams are lifted and installed using PEC beam hoisting components at the upper flange. The PEC frame beams are connected to the PEC columns using high-strength bolts. The specifications and quantity of the high-strength bolts are determined through calculation. Formwork is erected on-site and concrete is poured in the core area of ​​the beam-column joint. Figure 2 , Figure 8 As shown, the three views of the PEC beam lifting component are as follows: Figure 9-11 As shown;

[0051] S6. After the component is hoisted into place, the pre-embedded metal corrugated pipe is connected to the subsequent metal corrugated pipe. The pre-embedded metal corrugated pipe is inserted into the subsequent metal corrugated pipe, and the end of the pre-embedded metal corrugated pipe is equipped with a sealing ring. Sealing tape is wrapped around the junction of the pre-embedded metal corrugated pipe and the subsequent metal corrugated pipe. The inner diameter of the sealing ring is the same as the diameter of the pre-embedded metal corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-embedded metal corrugated pipe but slightly smaller than the diameter of the subsequent metal corrugated pipe. This ensures the airtightness of the internal cavity of the metal corrugated pipe and prevents concrete slurry from seeping into the metal corrugated pipe and causing blockage. Figure 12 As shown;

[0052] S7. After the corrugated metal pipe connection is completed, pour the post-cast concrete for the beam-column joint area. Thread steel strands inside the corrugated metal pipe, using the PEC beam lifting components as the fixing elements for the tensioning jacks, and tension the steel strands. Then, inject grout inside the corrugated metal pipe. Figure 13 As shown;

[0053] S8. After the steel strand tensioning is completed, the tensioning end anchorage is installed in the steel strand tensioning groove, and the tensioning groove cover plate is welded to the PEC frame beam using bevel welding to seal the steel strand tensioning groove. An opening is reserved in the tensioning groove to allow concrete to flow into it during floor slab concrete pouring. The tensioning end anchorage is then permanently sealed. Figure 2 , Figure 13 As shown;

[0054] S9. Disassemble the PEC beam lifting components and screw the vertical anchor bolts of the PEC frame beam into the pre-embedded nut sleeves to achieve a fixed connection of the vertical studs in this part. Figure 14 As shown;

[0055] S10. Lay the floor deck and pour the floor concrete.

[0056] In the above content, the pre-embedded metal corrugated pipes embedded within the concrete covering area of ​​the precast PEC frame beams extend a certain length within the area of ​​the subsequently poured concrete for on-site connection with subsequent metal corrugated pipes.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A connection node structure for a prestressed PEC steel frame beam, characterized in that, The system includes precast PEC frame beams and PEC columns. The PEC frame beams and PEC columns are connected by high-strength bolts. PEC beam lifting components are installed at the flanges of the PEC frame beams. These lifting components are connected to pre-embedded threaded sleeves within the PEC frame beams via bolts and washers. The beam-column joints of the PEC frame beams are filled with concrete. Pre-embedded corrugated metal pipes are embedded within the concrete-covered portion of the PEC frame beams, connecting to subsequent corrugated metal pipes. Corrugated metal pipe penetration holes are provided at the vertical diaphragms, end plates, and beam-column flanges of the PEC frame beams. The diameter of these pre-designed corrugated metal pipe penetration holes is larger than the diameter of the pre-embedded corrugated metal pipes. Prestressed steel is installed at the top of the PEC frame beams. A tensioning groove for prestressed steel strands is provided, on which tensioning end anchors are fixedly installed. The tensioning end anchors are sealed to the prestressed steel strand tensioning groove by a tensioning cover plate. The tensioning groove cover plate is welded and fixed to the PEC frame beam. An opening is provided on the tensioning groove cover plate. The tensioning fixed end of the prestressed steel strand is located at the upper flange of the precast PEC frame beam on the opposite side. The corresponding post-installed corrugated metal pipe of the precast PEC frame beam on this side passes through the tensioning groove at the upper flange of the PEC frame beam on the opposite side, passing through the vertical diaphragm, end plate, and PEC column flange of the PEC frame beam on the opposite side, and is connected to the pre-embedded corrugated metal pipe of the PEC frame beam on this side within the post-cast concrete range of the PEC column, so as to realize the connection of the prestressed steel strand corrugated metal pipe.

2. The prestressed PEC steel frame beam connection node structure according to claim 1, characterized in that, The construction method for the prestressed PEC steel frame beam connection node is as follows: During the production of S1 and PEC frame beams, metal corrugated pipes are pre-embedded within the area covered by concrete, and extend a certain length beyond the area of ​​the subsequently poured concrete for on-site connection with the subsequent metal corrugated pipes. The vertical diaphragms, end plates, and beam-column flanges of the S2 and PEC frame beams are all pre-drilled with holes for corrugated metal pipes. The factory precisely drills the holes on the corresponding steel components according to the shape of the prestressed steel strands, and the diameter of the pre-drilled holes is slightly larger than the diameter of the corrugated metal pipe. S3. When the pre-embedded metal corrugated pipe passes through the pre-reserved holes in the vertical diaphragm, end plate and beam-column flange of the PEC frame beam, a sealing ring should be installed at the perforation position of the metal corrugated pipe. The inner diameter of the sealing ring is slightly smaller than the outer diameter of the metal corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-reserved hole. S4. The horizontal studs connecting to the web of the steel beam serve both as connectors to enhance the combined effect between the concrete and steel structural members, and as fixation for the pre-embedded corrugated metal pipes within the concrete enclosure of the PEC frame beam. Item; S5. When hoisting the precast PEC frame beam, the beam is lifted and installed using the PEC beam hoisting component at the upper flange of the beam. The PEC frame beam is connected to the PEC column by high-strength bolts. S6. After the component is hoisted into place, the pre-embedded metal corrugated pipe is connected to the subsequent metal corrugated pipe. The pre-embedded metal corrugated pipe is inserted into the subsequent metal corrugated pipe, and the end of the pre-embedded metal corrugated pipe is equipped with a sealing ring. The junction of the pre-embedded metal corrugated pipe and the subsequent metal corrugated pipe is wrapped with sealing tape. S7. After the metal corrugated pipe is connected, pour the concrete in the post-cast area of ​​the beam-column joint, thread prestressed steel strands through the metal corrugated pipe, use the PEC beam hoisting component as the fixing component of the tensioning jack to tension the prestressed steel strands, and inject grout into the metal corrugated pipe. S8. After the prestressed steel strand is tensioned, the tensioning end anchor is installed in the prestressed steel strand tensioning groove, and the beam tensioning groove cover plate is welded to the PEC frame beam by bevel welding to seal the prestressed steel strand tensioning groove once. The tensioning groove has a reserved opening so that concrete can flow into the tensioning groove when the floor slab concrete is poured, and the tensioning end anchor is permanently sealed. S9. Disassemble the PEC beam hoisting components and screw the vertical anchor bolts of the PEC frame beam into the pre-embedded nut sleeves to achieve the fixed connection of the vertical studs in this part. S10. Lay the floor deck and pour the floor concrete.

3. The prestressed PEC steel frame beam connection node structure according to claim 2, characterized in that, The pre-embedded metal corrugated pipes embedded within the concrete covering area of ​​the precast PEC frame beam extend a certain length within the subsequent concrete pouring area for on-site connection with subsequent metal corrugated pipes.

4. The prestressed PEC steel frame beam connection node structure according to claim 2, characterized in that, In step S6, the inner diameter of the sealing ring is the same as the diameter of the pre-embedded metal corrugated pipe, and the outer diameter of the sealing ring is larger than the diameter of the pre-embedded metal corrugated pipe but slightly smaller than the diameter of the subsequent metal corrugated pipe.

5. The prestressed PEC steel frame beam connection node structure according to claim 2, characterized in that, In step S5, the specifications and quantity of high-strength bolts are determined by calculation, and the core area of ​​the beam-column joint is formed on-site and concrete is poured.

6. The prestressed PEC steel frame beam connection node structure according to claim 2, characterized in that, In step S4, the position of the horizontal stud is determined according to the shape of the prestressed steel strand and is precisely positioned in the factory.

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