Rigidity-adjustable underground structure beam column replaceable joint and mounting method

Abstract

The invention discloses a rigidity-adjustable underground structure beam column replaceable joint and an installation method, and belongs to the technical field of reinforced concrete structures. An I-shaped steel beam and disc spring energy dissipation components are arranged on a concrete column, and the disc spring energy dissipation components are arranged on the two sides of the I-shaped steel beam; the I-shaped steel beam and the disc spring energy dissipation component are connected with the arc-shaped steel plates on the two sides, the arc-shaped steel plates are connected with the connecting steel plate through the multiple prefabricated energy dissipation rods and assemblies thereof, and the connecting steel plate is arranged on the side, facing the concrete column, of the concrete beam. The disc spring energy dissipation component rotates relative to the concrete column, the threaded steel sleeve slides up and down in the arc-shaped groove of the arc-shaped steel plate to generate relative angular displacement to extrude or stretch the disc spring to achieve energy dissipation and shock absorption, the adjusting range is large, and damage is not prone to occurring; axial rigidity is provided through the concrete beam and the I-shaped steel beam, and axial tension and compression energy dissipation is provided through the prefabricated energy dissipation rods and assemblies thereof. Rotation energy consumption and horizontal energy consumption are connected and are independent of each other, and when the beam columns rotate relatively, horizontal energy consumption assemblies cannot be damaged.

Description

Technical Field

[0001] The present invention belongs to the technical field of reinforced concrete structures, and in particular relates to a replaceable node for beams and columns of underground structures with adjustable stiffness and an installation method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Underground structures, such as underground buildings and subway stations, are a vital component of modern urban infrastructure. These structures are located in complex geological environments for extended periods, subject to a variety of loads, including soil pressure, water pressure, and earthquakes. These loads place higher demands on their load-bearing capacity, deformation resistance, and durability.

[0004] Beam-column joints are critical force transmission points in underground structures, and their performance directly impacts the safety and reliability of the overall structure. Traditional beam-column joints typically utilize either rigid or hinged connections. Rigid joints offer significant stiffness, but are prone to stress concentration under dynamic loads such as earthquakes, leading to cracking and even failure of the concrete in the joint area. While hinged joints can partially release bending moments, their stiffness is low, making them difficult to meet the deformation control requirements of underground structures.

[0005] Patent CN115977245B, for example, discloses a high-energy-dissipation, high-load-bearing, self-resetting beam-column joint. This joint features a steel member hinged at the center, with energy-dissipating steel rods mounted above and below the hinge. Disc springs are placed around the rods, which are connected to the longitudinal reinforcement within the beam via threaded sleeves. This joint exhibits excellent seismic resistance and self-resetting capabilities in high-intensity earthquakes. Damaged rods can be easily replaced, resulting in efficient repair.

[0006] The above solution still has the following shortcomings:

[0007] The energy-absorbing components are mainly arranged in the horizontal direction. When the beam-column nodes rotate relative to each other, the adjustment range is limited, and it is difficult to achieve a large-scale adjustment of the node stiffness. Energy cannot be effectively consumed, which may cause damage to the horizontal energy-absorbing components and affect their use function. In addition, the node structure in the above scheme is complex, the construction is inconvenient, and the replaceability is poor. It is difficult to replace it quickly after damage, which affects the normal use of the structure. Summary of the Invention

[0008] In response to the above problems, the present invention provides a replaceable node and installation method for underground structure beams and columns with adjustable stiffness, in which a disc spring energy-absorbing component is arranged to rotate relative to the concrete column, and the threaded steel sleeve slides up and down in the arc groove of the arc-shaped steel plate to generate relative angular displacement to squeeze or stretch the disc spring and realize energy dissipation and shock absorption, and the adjustment range is large and not easy to be damaged; the axial stiffness is provided by the concrete beam and the I-beam beam, and the prefabricated energy-absorbing rods and their components between the arc-shaped steel plate and the connecting steel plate provide axial tensile and compressive energy dissipation; the rotational energy dissipation and the horizontal energy dissipation are connected and are independent of each other, so that when the beam and column rotate relative to each other, the horizontal energy-absorbing components will not be damaged; and both the disc spring energy-absorbing component and the prefabricated energy-absorbing rods and their components are prefabricated steel components, which are easily replaceable and can be quickly replaced after damage.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] In a first aspect, a replaceable beam-column node for an underground structure with adjustable stiffness is provided, which is arranged between a concrete column and a concrete beam. An I-beam and a disc spring energy-absorbing member are arranged on the concrete column, and the disc spring energy-absorbing member is arranged on both sides of the I-beam. The I-beam and the disc spring energy-absorbing member are connected to curved steel plates on both sides. The curved steel plates are connected to connecting steel plates via multiple prefabricated energy-absorbing rods and their assemblies. The connecting steel plates are arranged on the side of the concrete beam facing the concrete column. An installation space is reserved between the curved steel plates and the connecting steel plates.

[0011] The disc spring energy-absorbing component includes two rotating steel plates, which include a horizontal plate and a vertical plate vertically fixed on the center line of the horizontal plate. The horizontal plate is fixedly connected to the concrete column. A disc spring is arranged between the rotating steel plates, and a disc spring steel rod is inserted into the disc spring.

[0012] Preferably, one end of the I-beam is arranged perpendicular to the concrete column, and the I-beam is an I-beam, including a web, an upper flange plate and a lower flange plate arranged perpendicular to the web; the setting heights of the two rotating steel plates of the same disc spring energy-absorbing component meet the following requirements: the upper rotating steel plate is higher than the upper flange plate, and the lower rotating steel plate is lower than the lower flange plate.

[0013] Preferably, when tying the concrete column reinforcement cage, the I-beam and the reinforcement cage are tied and welded together according to the design requirements; at the same time, the embedded bolts are fixed above and below both sides of the I-beam according to the set upper and lower distances; after the concrete column is poured and cured, the rotating steel plate is connected to the concrete column through the embedded bolts.

[0014] Preferably, when tying the concrete beam reinforcement cage, embedded bolts are fixed on the beam end reinforcement cage according to the design requirements of the connecting steel plate. After the curing is completed, the connecting steel plate is connected to the embedded bolts.

[0015] Preferably, the vertical plate has a disc spring steel rod hole, and a disc spring is arranged between the disc spring steel rod holes of the two rotating steel plates so that the disc spring steel rod passes through the disc spring; a circular threaded steel sleeve parallel to the horizontal plate is fixedly arranged at the end of the vertical plate away from the horizontal plate for connecting the arc-shaped steel plate.

[0016] Preferably, the I-beam is connected to the arc-shaped steel plate through a rotating shaft. A rotating connection hole is provided in the center of the web at one end away from the concrete column. A rotating connection hole is also provided on the center line of the vertical edge of the arc-shaped steel plate close to the concrete column end, and the rotating shaft passes through the rotating connection hole.

[0017] Preferably, an arc-shaped groove is provided on the upper and lower sides of the rotating shaft of the arc-shaped steel plate, and the vertical spacing between the centers of the two arc-shaped grooves is equal to the vertical spacing of the vertical plates on the same side; the size of the arc-shaped groove matches the circular threaded steel sleeve, and the circular threaded steel sleeve passes through the arc-shaped groove, and the circular threaded steel sleeves at the same height are connected by connecting steel rods.

[0018] Preferably, multiple prefabricated energy-absorbing rods and their components are arranged symmetrically up and down with the rotating shaft as the center. The prefabricated energy-absorbing rods and their components include multiple energy-absorbing steel rods of the same size, and the two ends of the multiple energy-absorbing steel rods are fixed on the connecting rod; the multiple energy-absorbing steel rods are symmetrically arranged on both sides of the length center of the connecting rod.

[0019] Preferably, the connecting steel rods, I-beams, curved steel plates, connecting steel plates, rotating steel plates, prefabricated energy-absorbing rods and components thereof, disc springs, rotating shafts, threaded steel sleeves, disc spring steel rods, and embedded bolts are all prefabricated in a factory.

[0020] In a second aspect, a method for installing the aforementioned replaceable nodes for beams and columns in underground structures with adjustable stiffness is provided, and the specific steps are as follows:

[0021] When tying the concrete column reinforcement cage, tie and weld the I-beam and the concrete column reinforcement cage together according to the design requirements; at the same time, fix the embedded bolts on the upper and lower sides of the concrete column reinforcement cage according to the set upper and lower distances; and then cast the concrete column;

[0022] Fix the embedded bolts on the steel cage of the concrete beam according to the design requirements of the connection steel plate, and pour the concrete beam;

[0023] After the curing is completed, the curved steel plate is connected to the I-beam; then the connecting steel plate and the rotating steel plate are installed on the corresponding positions of the concrete beam and concrete column respectively; the threaded steel sleeve is inserted into the curved groove, and the connecting steel rod is connected to the threaded steel sleeve to complete the connection between the rotating steel plate and the curved steel plate; then the embedded nuts of all embedded bolts are tightened;

[0024] Then, disc springs are set between the rotating steel plates, steel rods are passed through the disc springs, and the steel rod nuts are tightened to complete the installation of the disc spring energy-absorbing components. Finally, the prefabricated energy-absorbing rods and their components are connected between the arc-shaped steel plates and the connecting steel plates.

[0025] Compared with the prior art, the present invention has the following advantages and positive effects:

[0026] The present invention arranges a disc spring energy-absorbing component to rotate relative to the concrete column, and the threaded steel sleeve slides up and down in the arc groove of the arc-shaped steel plate to generate relative angular displacement to squeeze or stretch the disc spring and realize energy dissipation and shock absorption, and the adjustment range is large and not easy to be damaged; the concrete beam and the I-beam provide axial rigidity, and the prefabricated energy-absorbing rods and their components between the arc-shaped steel plate and the connecting steel plate provide axial tension and compression energy dissipation; the rotational energy dissipation and the horizontal energy dissipation are connected and are independent of each other, and the horizontal energy dissipation components will not be damaged when the beam and column rotate relative to each other; and both the disc spring energy-absorbing component and the prefabricated energy-absorbing rods and their components are prefabricated steel components, which are easily replaceable and can be quickly replaced after damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 is a three-dimensional schematic diagram of the overall structure of the node of embodiment 1 or 2 of the present invention;

[0029] Figure 2 is a schematic top view in the opposite direction of the overall structure of the node of Embodiment 1 or 2 of the present invention;

[0030] Figure 3 Schematic diagram of the connection between the concrete column and the curved steel plate according to Embodiment 1 or 2 of the present invention;

[0031] Figure 4 This is a schematic diagram of the connection between the concrete beam and the prefabricated energy dissipation rod and their components according to Embodiment 1 or 2 of the present invention;

[0032] Figure 5 is a schematic diagram of a disc spring energy dissipation component according to embodiment 1 or 2 of the present invention;

[0033] Figure 6 Schematic diagram of the prefabricated energy dissipation rod and its components according to Embodiment 1 or 2 of the present invention;

[0034] In the picture:

[0035] 1. Concrete column; 2. Concrete beam; 3. I-beam; 4. Arc-shaped steel plate; 5. Connecting steel plate; 6. Rotating steel plate; 7. Prefabricated energy-absorbing rod and its components; 8. Disc spring; 9. Embedded bolt; 10. Rotating shaft; 11. Threaded steel sleeve; 12. Connecting steel rod; 13. Disc spring steel rod. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0037] The present invention will be described in detail below with reference to the accompanying drawings.

[0038] Example 1

[0039] This embodiment discloses a replaceable node for beams and columns of underground structures with adjustable stiffness, such as Figure 1 As shown, it is arranged between the concrete column 1 and the concrete beam 2. Specifically, an I-beam 3 and a disc spring energy-absorbing component are arranged on the side of the concrete column 1 facing the concrete beam 2, and the disc spring energy-absorbing components are arranged on both sides of the I-beam 3; the I-beam 3 and the disc spring energy-absorbing component are connected to the arc-shaped steel plate 4, and the arc-shaped steel plate 4 is connected to the connecting steel plate 5 through a plurality of prefabricated energy-absorbing rods and their components 7. The connecting steel plate 5 is arranged on the side of the concrete beam 2 facing the concrete column 1.

[0040] Furthermore, one end of the I-beam 3 is arranged perpendicular to the concrete column 1. Specifically, when the I-beam 3 is connected to the concrete column 1, when tying the steel cage of the concrete column 1, the I-beam 3 and the steel cage of the concrete column 1 are tied and welded together according to the design requirements, and finally concrete is poured to form an integral structure.

[0041] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 As shown, each disc spring energy-absorbing component includes two rotating steel plates 6. The rotating steel plates 6 are T-shaped plates, including a horizontal plate and a vertical plate. The vertical plate is vertically fixed to the center line of the horizontal plate. A number of fixing holes are evenly arranged on the horizontal plate. In this embodiment, eight fixing holes are arranged, which are divided into two groups by the vertical plates, with four in each group. By arranging embedded bolts 9 on the concrete column 1, passing the embedded bolts 9 through the fixing holes, and tightening the embedded nuts, the rotating steel plates 6 are fixed to the concrete column 1.

[0042] It should be noted that the I-beam 3 is an I-beam, including a web, an upper flange plate and a lower flange plate arranged perpendicular to the web, and the flange plate of the I-beam is arranged parallel to the ground; the setting heights of the two rotating steel plates 6 of the same disc spring energy-absorbing component meet the following requirements: the upper rotating steel plate 6 is higher than the upper flange plate of the I-beam 3, and the lower rotating steel plate 6 is lower than the lower flange plate of the I-beam 3.

[0043] It can be understood that, on both sides of the I-beam 3 , the upper rotating steel plates 6 are of the same height, and the lower rotating steel plates 6 are of the same height.

[0044] like Figure 3 、 Figure 5 As shown, the vertical plate of the rotating steel plate 6 is provided with a disc spring steel rod hole. Between the two rotating steel plates 6 of the same disc spring energy-absorbing component, the disc spring steel rod 13 passes through the disc spring steel rod holes of the two rotating steel plates 6. It should be noted that before the disc spring steel rod 13 passes through the disc spring steel rod hole, a disc spring 8 is set between the disc spring steel rod holes of the two rotating steel plates 6 so that the disc spring steel rod 13 passes through the disc spring 8. Then, steel rod nuts are set at the upper and lower ends of the disc spring steel rod 13, that is, threaded sections are set on the disc spring steel rod 13. Figure 3 、 Figure 5 As shown, a circular threaded steel sleeve 11 parallel to the horizontal plate is fixedly provided at the end of the vertical plate of the rotating steel plate 6 away from the concrete column 1 for connecting the arc-shaped steel plate 4 .

[0045] In this embodiment, a disc spring steel rod hole is provided on the vertical plate of the rotating steel plate 6 at a position 2 / 3 away from the concrete column 1 .

[0046] In this embodiment, before concrete is poured into concrete column 1, embedded bolts 9 are fixed to the reinforcement cage of concrete column 1, above and below the I-beam 3 on either side, according to a predetermined vertical distance. After concrete column 1 is poured and cured, rotating steel plates 6 are connected to concrete column 1 via embedded bolts 9. It is important to note that the vertical distance determined here determines the distance between rotating steel plates 6, and thus the number of coils of disc springs 8 between them. Adjusting the number of coils of disc springs 8 adjusts the vertical stiffness of the joint, adapting it to different structural types.

[0047] like Figure 3 As shown, the I-beam 3 is connected to the arc-shaped steel plates 4 on both sides through a rotating shaft 10. Specifically, a rotating connection hole is set in the center of the web at one end of the I-beam 3 away from the concrete column 1, and a rotating connection hole is also set on the vertical side center line of the arc-shaped steel plate 4 close to the concrete column 1. The rotating shaft 10 passes through the rotating connection hole; threaded sections are set at both ends of the rotating shaft 10, and the connection between the I-beam 3 and the arc-shaped steel plate 4 is completed by tightening the rotating shaft nuts at both ends of the rotating shaft 10.

[0048] like Figure 3As shown, the curved steel plate 4 is provided with an arcuate groove above and below the rotating shaft 10. The vertical spacing between the centers of the two arcuate grooves is equal to the vertical spacing between the vertical plates of the two rotating steel plates 6. The dimensions of the arcuate grooves match those of the circular threaded steel sleeves 11. The circular threaded steel sleeves 11 on the same side are inserted through the arcuate grooves of the curved steel plate 4 to connect the curved steel plate 4 to the rotating steel plate 6 on the same side. The two circular threaded steel sleeves 11 at the same height are connected by a connecting steel rod 12.

[0049] It should be noted that the internal threads of the circular threaded steel sleeve 11 are consistent in size and direction. The connecting steel rod 12 is provided with threaded sections, with the threads running in opposite directions on either side of the length center of the connecting steel rod 12. This facilitates connecting the circular threaded steel sleeve 11 at both ends of the connecting steel rod 12.

[0050] like Figure 1 、 Figure 2 As shown, the curved steel plate 4 and the connecting steel plate 5 are connected by a plurality of prefabricated energy dissipation rods and their assemblies 7. Specifically, the plurality of prefabricated energy dissipation rods and their assemblies 7 are arranged symmetrically about the rotation axis 10. In this embodiment, two prefabricated energy dissipation rods and their assemblies 7 are arranged symmetrically about the rotation axis 10.

[0051] Furthermore, the prefabricated energy dissipation rod and its assembly 7 are connected to the arc-shaped steel plate 4 at one end of the arc-shaped steel plate 4 away from the concrete column 1; Figure 3 As shown, the end of the arc-shaped steel plate 4 away from the concrete column 1 is provided with energy dissipation rod connection holes above and below the center line of the vertical plate.

[0052] Furthermore, the upper energy dissipation rod connection hole is horizontally aligned with the bottom of the upper arcuate slot, while the lower energy dissipation rod connection hole is horizontally aligned with the top of the lower arcuate slot. In other words, the vertical spacing between the energy dissipation rod connection holes is equal to the spacing between the bottom of the upper arcuate slot and the top of the lower arcuate slot.

[0053] Furthermore, if Figure 4 As shown, two symmetrical energy dissipation rod connection holes are also set above and below the vertical edge midline at one end of the connecting steel plate 5 close to the concrete column 1, and the spacing between the two symmetrical energy dissipation rod connection holes is consistent with the spacing of the energy dissipation rod connection holes of the arc steel plate 4.

[0054] like Figure 1 As shown, two prefabricated energy dissipation rods and their components 7 are connected between the connecting steel plate 5 and the arc-shaped steel plate 4 through the energy dissipation rod connection holes. Figure 6As shown, the prefabricated energy dissipation rod and its assembly 7 comprise multiple uniformly sized energy dissipation steel rods, each secured to a connecting rod with threaded sections at each end. The prefabricated energy dissipation rod and its assembly 7 are connected to the connecting steel plate 5 or curved steel plate 4 by inserting the connecting rods through the connecting holes and tightening the connecting rod nuts.

[0055] Furthermore, multiple energy-absorbing steel rods are symmetrically arranged on both sides of the length center of the connecting rod. When the number of energy-absorbing steel rods is an odd number, one energy-absorbing steel rod is arranged at the length center of the connecting rod, and the remaining energy-absorbing steel rods are still symmetrically arranged on both sides of the length center of the connecting rod.

[0056] It should also be noted that the stiffness at the node level can be adjusted by adjusting the cross-sectional area of ​​the energy-absorbing steel rod, or the number of prefabricated energy-absorbing rods and their components 7, or the number of energy-absorbing steel rods in the prefabricated energy-absorbing rods and their components 7.

[0057] like Figure 1 、 Figure 4 As shown, the end of the connecting steel plate 5 away from the concrete column 1 is fixedly connected to the concrete beam 2. Specifically, the connection method of the connecting steel plate 5 and the concrete beam 2 is: after the concrete beam reinforcement cage is tied and before the concrete is poured, the embedded bolts 9 are fixed on the reinforcement cage at the beam end according to the design requirements of the connecting steel plate 5. After the concrete beam is solidified and cured, the connecting steel plate 5 is connected to the embedded bolts 9.

[0058] Furthermore, an installation space is reserved between the curved steel plate 4 and the connecting steel plate 5 , so that the prefabricated energy dissipation rod and its components 7 can be installed between the curved steel plate 4 and the connecting steel plate 5 .

[0059] In other words, the length of the installation space in the horizontal plane, plus the length from the energy-absorbing rod connection hole of the arc-shaped steel plate 4 to the end of the arc-shaped steel plate 4 away from the concrete column 1, plus the length from the energy-absorbing rod connection hole of the connecting steel plate 5 to the end of the connecting steel plate 5 close to the concrete column 1, is equal to the length of the prefabricated energy-absorbing rod and its component 7 energy-absorbing steel rod.

[0060] It should be noted that the steel components mentioned above: I-beam 3, curved steel plate 4, connecting steel plate 5, rotating steel plate 6, prefabricated energy-absorbing rod and its components 7, disc spring 8, rotating shaft 10, threaded steel sleeve 11, connecting steel rod 12, disc spring steel rod 13, embedded bolt 9 are all prefabricated in the factory and can be ordered according to specific structural requirements for easy on-site assembly and use.

[0061] Working principle:

[0062] The vertical bearing capacity of the node is mainly provided by the bending resistance of the concrete beam, disc spring energy-absorbing components, I-beam and the shear resistance of the high-strength steel plate, while the horizontal bearing capacity of the node is mainly provided by the axial tension and compression performance of the prefabricated energy-absorbing rods and their components, concrete beams, curved steel plates and connecting steel plates.

[0063] Regarding the horizontal seismic performance of the nodes, the concrete beams and I-beams primarily provide sufficient axial stiffness, while the prefabricated energy-absorbing rods and their components between the curved steel plates and the connecting steel plates dissipate axial tension and compression. The stiffness of the energy-absorbing rods can be adjusted to meet the needs of different structures by adjusting their cross-sectional area. Furthermore, the high stiffness of the prefabricated energy-absorbing rods and their components effectively prevents brittle failure and ensures that the load-bearing capacity remains high even after an earthquake.

[0064] To ensure both node rotation and horizontal vibration damping, the disc spring energy-absorbing member rotates relative to the concrete column, and the threaded steel sleeve slides up and down within the curved groove of the curved steel plate, generating relative angular displacement that squeezes or stretches the disc spring and achieves energy dissipation and vibration damping. This adjustment range is wide and resistant to damage. The coordinated deformation of the disc spring energy-absorbing member and the curved steel plate 4, coupled with the energy absorption and release capabilities of the disc spring 8, allows the disc spring energy-absorbing member to effectively dissipate energy and is less susceptible to damage or plastic yield, thus providing rotational vibration damping for the node.

[0065] The rotational energy dissipation and the horizontal energy dissipation are connected, and are independent of each other. When the beams and columns rotate relative to each other, the horizontal energy dissipation components will not be damaged. Moreover, both the disc spring energy dissipation components and the prefabricated energy dissipation rods and their components are prefabricated steel components with good replaceability. After damage, the corresponding connecting nuts can be removed, and the damaged components can be disassembled and quickly replaced.

[0066] This joint concentrates seismic energy on the disc spring energy-absorbing components and energy-absorbing steel rods, reducing damage to cast-in-place frame beams and columns. After an earthquake, only the disc spring energy-absorbing components and prefabricated energy-absorbing rods and their components need to be replaced, allowing the entire structure to quickly restore its original function. This joint not only enhances the energy-absorbing function of the joint area but also extends the life cycle of cast-in-place beams and columns.

[0067] In this embodiment, the beam-column node is located in the underground structure, and the disc spring energy-absorbing component bears the axial force and shear force of the beam and column ends under the action of the smaller overlying soil load. It is not easily damaged even in the event of a major earthquake, avoiding it from being in a complex coupled stress state and can fully exert its energy-absorbing and shock-absorbing effect.

[0068] Furthermore, the node structure in this embodiment is easily disassembled after earthquake damage, requiring only the damaged components to quickly restore original functionality. If no damage occurs after the earthquake, no replacement is necessary. This node is suitable for beam-column connections in underground structures, such as large-scale underground frame structures and subway stations. It can be placed in areas prone to severe damage, such as side spans, where beam-column nodes connect. This ease of disassembly improves the seismic resilience of the overall structure.

[0069] Example 2

[0070] This embodiment discloses a method for installing a replaceable underground structure beam-column node with adjustable stiffness, which utilizes the replaceable underground structure beam-column node with adjustable stiffness disclosed in Example 1. The specific steps are as follows:

[0071] When tying the steel cage of the concrete column 1, the I-beam 3 is tied and welded to the steel cage of the concrete column 1 according to the design requirements; at the same time, the embedded bolts 9 are fixed on the upper and lower sides of the steel cage of the concrete column according to the set upper and lower distances; and the concrete column 1 is cast.

[0072] Fix the embedded bolts 9 on the steel cage of the concrete beam 2 according to the design requirements of the connecting steel plate 5, and cast the concrete beam 2;

[0073] After the concrete column 1 and concrete beam 2 are cured, first connect the curved steel plate 4 to the I-beam 3; then install the connecting steel plate 5 and the rotating steel plate 6 on the corresponding positions of the concrete beam 2 and concrete column 1 respectively;

[0074] Insert the threaded steel sleeve 11 of the rotating steel plate 6 into the arc groove of the arc steel plate 4, and then connect the connecting steel rod 12 to the threaded steel sleeve 11 to complete the connection between the rotating steel plate 6 and the arc steel plate 4; then tighten the embedded nuts of all embedded bolts 9;

[0075] Then, the disc spring 8 is set between the rotating steel plates 6, and then the disc spring steel rod 13 is passed through and the steel rod nut is tightened to complete the installation of the disc spring energy dissipation component.

[0076] Finally, the prefabricated energy dissipation rod and its assembly 7 are connected between the arc-shaped steel plate 4 and the connecting steel plate 5 .

[0077] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A replaceable joint for underground structure beams and columns with adjustable stiffness, arranged between concrete columns and concrete beams, characterized in that: An I-beam and a disc spring energy-absorbing component are arranged on the concrete column. The disc spring energy-absorbing components are arranged on both sides of the I-beam. The I-beam and the disc spring energy-absorbing component are connected to the curved steel plates on both sides. The curved steel plates are connected to the connecting steel plates through multiple prefabricated energy-absorbing rods and their components. The connecting steel plates are arranged on the side of the concrete beam facing the concrete column. An installation space is reserved between the curved steel plates and the connecting steel plates. The disc spring energy-absorbing component includes two rotating steel plates, which include a horizontal plate and a vertical plate vertically fixed on the center line of the horizontal plate. The horizontal plate is fixedly connected to the concrete column. A disc spring is arranged between the rotating steel plates, and a disc spring steel rod is inserted into the disc spring.

2. The replaceable underground structure beam-column node with adjustable stiffness according to claim 1, characterized in that: One end of the I-beam is arranged perpendicular to the concrete column. The I-beam is an I-beam, including a web, an upper flange plate and a lower flange plate arranged perpendicular to the web; the setting heights of the two rotating steel plates of the same disc spring energy-absorbing component meet the following requirements: the upper rotating steel plate is higher than the upper flange plate, and the lower rotating steel plate is lower than the lower flange plate.

3. The replaceable underground structure beam-column node with adjustable stiffness according to claim 1, characterized in that: When tying the concrete column reinforcement cage, the I-beam and the reinforcement cage are tied and welded together according to the design requirements; at the same time, embedded bolts are fixed above and below both sides of the I-beam according to the set upper and lower distances; after the concrete column is poured and cured, the rotating steel plate is connected to the concrete column through the embedded bolts.

4. The replaceable underground structure beam-column node with adjustable stiffness according to claim 1, characterized in that: When tying the concrete beam reinforcement cage, fix the embedded bolts on the beam end reinforcement cage according to the design requirements of the connecting steel plate. After the curing is completed, connect the connecting steel plate with the embedded bolts.

5. The replaceable underground structure beam-column node with adjustable stiffness according to claim 1, characterized in that: The vertical plate has a disc spring steel rod hole, and a disc spring is set between the disc spring steel rod holes of the two rotating steel plates so that the disc spring steel rod passes through the disc spring; a circular threaded steel sleeve parallel to the horizontal plate is fixed at the end of the vertical plate away from the horizontal plate for connecting the arc-shaped steel plates.

6. The replaceable joint of underground structure beams and columns with adjustable stiffness as claimed in claim 1, characterized in that: The I-beam and the curved steel plate are connected through a rotating shaft. A rotating connection hole is set in the center of the web at the end away from the concrete column. A rotating connection hole is also set on the center line of the vertical side of the curved steel plate close to the concrete column. The rotating shaft passes through the rotating connection hole.

7. The replaceable joint of underground structure beams and columns with adjustable stiffness as claimed in claim 6, characterized in that: An arc-shaped groove is provided on the upper and lower sides of the rotating shaft of the arc-shaped steel plate. The vertical spacing between the centers of the two arc-shaped grooves is equal to the vertical spacing of the vertical plates on the same side. The size of the arc-shaped groove matches the circular threaded steel sleeve. The circular threaded steel sleeve passes through the arc-shaped groove. The circular threaded steel sleeves at the same height are connected by connecting steel rods.

8. The replaceable underground structure beam-column node with adjustable stiffness according to claim 6, characterized in that: Multiple prefabricated energy-absorbing rods and their components are arranged symmetrically up and down with the rotating shaft as the center. The prefabricated energy-absorbing rods and their components include multiple energy-absorbing steel rods of the same size. The two ends of the multiple energy-absorbing steel rods are fixed on the connecting rod; the multiple energy-absorbing steel rods are symmetrically arranged on both sides of the length center of the connecting rod.

9. The replaceable underground structure beam-column node with adjustable stiffness according to claim 7, characterized in that: The connecting steel rods, I-beams, curved steel plates, connecting steel plates, rotating steel plates, prefabricated energy-absorbing rods and components thereof, disc springs, rotating shafts, threaded steel sleeves, disc spring steel rods, and embedded bolts are all prefabricated in a factory.

10. A method for installing a replaceable joint for an underground structure beam column with adjustable stiffness according to any one of claims 1 to 9, wherein the specific steps are as follows: When tying the concrete column reinforcement cage, tie and weld the I-beam and the concrete column reinforcement cage together according to the design requirements; at the same time, fix the embedded bolts on the upper and lower sides of the concrete column reinforcement cage according to the set upper and lower distances; and then cast the concrete column; Fix the embedded bolts on the steel cage of the concrete beam according to the design requirements of the connection steel plate, and pour the concrete beam; After the curing is completed, the curved steel plate is connected to the I-beam; then the connecting steel plate and the rotating steel plate are installed on the corresponding positions of the concrete beam and concrete column respectively; the threaded steel sleeve is inserted into the curved groove, and the connecting steel rod is connected to the threaded steel sleeve to complete the connection between the rotating steel plate and the curved steel plate; then the embedded nuts of all embedded bolts are tightened; Then, disc springs are set between the rotating steel plates, steel rods are passed through the disc springs, and the steel rod nuts are tightened to complete the installation of the disc spring energy-absorbing components. Finally, the prefabricated energy-absorbing rods and their components are connected between the arc-shaped steel plates and the connecting steel plates.

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