Dismountable rc beam-column joint with floor

Abstract

The application discloses a detachable RC beam-column joint with a floor, which comprises a prefabricated column, a prefabricated beam and a prefabricated floor, the prefabricated column and the prefabricated beam are connected through a first connecting piece, the connecting piece comprises an energy dissipation component, the beam end and the column end of the beam-column joint can relatively rotate, so that the energy dissipation component is deformed first after being stressed, the prefabricated floor is provided with a connecting joint for connecting a second connecting piece, and the connecting joint of the prefabricated floor and the connecting joint of the beam-column joint can relatively move when the beam end and the column end of the beam-column joint generate relative displacement. The application solves the protection problem of the floor connected with the beam-column joint when the first connecting piece with the beam end and the column end capable of relatively rotating is adopted.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building construction, and in particular to a detachable RC beam-column joint with a floor slab. Background Technology

[0002] The applicant disclosed a seismically resilient prefabricated RC beam-column joint in Chinese patent publication number CN216616219U. This joint utilizes prefabricated columns and beams manufactured in a standardized factory, transported to the site for assembly. The prefabricated columns and beams are connected by H-beams embedded in the columns and beams, along with transverse and longitudinal connecting steel plates. The transverse connecting steel plates are structurally weakened, and arc-shaped keyways are provided on the longitudinal steel plates to offer more rotational space for the columns and beams. This allows the transverse connecting steel plates to yield and deform first under seismic loads, absorbing seismic energy and preventing brittle failure of the beam-column joint. However, a drawback is that when using existing floor slabs for assembly, the rotational deformation of the beams and columns can cause localized rotation of the floor slab, potentially damaging it. To address this, the applicant proposed a new connection structure between the floor slab and the beam-column joint, building upon the existing beam-column joint design. Summary of the Invention

[0003] To address the above shortcomings, the present invention aims to provide a prefabricated RC beam-column joint with floor slab and earthquake-resistant replaceable accessories.

[0004] Therefore, the present invention provides a detachable RC beam-column joint with a floor slab, comprising a precast column, a precast beam, and a precast floor slab. The precast column and the precast beam are connected by a first connector, which includes an energy-dissipating component. The beam end and the column end of the beam-column joint can rotate relative to each other, so that the energy-dissipating component deforms first when subjected to force. The precast floor slab and the beam-column joint are provided with a connection node for connecting a second connector. When the beam end and the column end of the beam-column joint undergo relative displacement, the connection node of the precast floor slab and the connection node of the beam-column joint can move relative to each other.

[0005] Furthermore, the second connector includes an open steel box embedded in the precast beam. The connection node of the precast floor slab is provided with a channel, which includes a bottom opening and steel plates on both sides of the opening. The second connector also includes a connecting rod, which includes pads that cooperate with the steel plates on both sides of the opening. The connecting rod passes through the upper surface of the open steel box and is fixed to the open steel box so that the pads and the open steel box are clamped on the steel plates on both sides of the opening.

[0006] Furthermore, the yield strength of the open steel box is less than the breaking strength of the precast floor slab.

[0007] The second connector includes a sleeve with a stepped surface inside. The sleeve is fixed to the open steel box. The lower end of the connecting rod has a shape that matches the stepped surface of the sleeve, so that the sleeve is fitted onto the lower end of the connecting rod. The end of the connecting rod is provided with an L-shaped clamping plate. The clamping plate engages with the end of the sleeve, so that the pad and the upper surface of the open steel box are clamped on the steel plates on both sides of the slot.

[0008] Furthermore, the card plate has structurally weak points.

[0009] Furthermore, the card plate has several elastic cards and holes in the middle, with the holes cooperating with the elastic cards. The sleeve has a groove that cooperates with the elastic cards, and the end of the groove facing the floor slab has an inclined surface. The elastic card has a stop block that cooperates with the groove. When the sleeve is fitted onto the connecting rod, the elastic card is engaged at the end of the sleeve. The stop block is located at the connection between the groove and the inclined surface. The end of the card plate is a predetermined distance away from the end of the elastic card.

[0010] Furthermore, the channel and the open steel box are provided with studs, which are pre-embedded in the concrete structure.

[0011] Furthermore, the first connector includes a column protrusion bracket provided on the side of the precast column, a column end H-beam connected to the column protrusion bracket, a beam end H-beam connected to the precast beam, and the column end H-beam and beam end H-beam connected by connecting steel plates. The connecting steel plates include a longitudinal connecting steel plate, an outer transverse connecting steel plate, and an inner transverse connecting steel plate. The outer transverse connecting steel plate and the inner transverse connecting steel plate have structurally weak points and are used to connect to the flanges of the column end H-beam and beam end H-beam. The column end H-beam... Bolt holes are pre-drilled in the web of the H-beam at the beam end, and horizontal elongated holes are opened on the upper and lower sides of the longitudinal connecting steel plate. Bolt holes are pre-drilled in the middle of the longitudinal connecting steel plate. The elongated holes and pre-drilled bolt holes of the longitudinal connecting steel plate correspond to the pre-drilled bolt holes in the web of the H-beam at the column end and the H-beam at the beam end, and are fixed by bolts. The H-beam at the column end and the H-beam at the beam end have rotation space, so that when subjected to external force, the outer transverse connecting steel plate and the inner transverse connecting steel plate will yield and deform first.

[0012] Furthermore, a gap is reserved between the column-end H-beam and the beam-end H-beam.

[0013] Furthermore, studs are welded to the H-beams at the beam ends, and studs are welded to both sides of the web.

[0014] Beneficial technical effects of the present invention:

[0015] (1) The column-end H-beam and beam-end H-beam of the beam-column joint of the present invention are connected by a transverse connecting steel plate and a longitudinal connecting steel plate. The transverse connecting steel plate is provided with a structurally weak point to form an energy-dissipating component and is connected to the flange of the column-end H-beam and beam-end H-beam. The web of the longitudinal connecting steel plate is provided with elongated holes on both sides for bolt engagement. The middle part of the web is engaged with bolts through bolt holes. Due to the structural weakening design of the transverse connecting steel plate and the design of the elongated holes on both sides and the bolt holes in the middle of the longitudinal connecting steel plate, the column-end and beam-end H-beams can rotate relative to each other, so that the energy-dissipating component first undergoes yield deformation to dissipate seismic energy. The second connecting piece of the floor slab of the present invention can separate or displace the connection node of the precast floor slab from the connection node of the beam-column joint when the column-end and beam-end H-beams rotate, so as to avoid the rotation of the beam causing the precast floor slab to rotate and causing damage to the precast floor slab.

[0016] (2) In specific embodiment 1 of the present invention, the deformation of the beam causes the second connector to generate tension, and the open steel box structure is prone to deformation, which causes the connection node of the precast floor slab to separate from the connection node of the beam-column node, thus avoiding the rotation of the precast floor slab; In specific embodiment 2 of the present invention, the connecting rod of the second connector is clamped to the sleeve by a clamping plate, the outer surface of the sleeve is provided with external threads and fixed to the open steel box by a nut, and the clamping plate has a structural weak point. When the beam deforms, the clamping plate deforms first, causing the second connector at that point to break off; In specific embodiment 4 of the present invention, a retaining ring is provided. When the beam deforms, the retaining ring disengages under the action of the baffle. The clamping plate can prevent the second connector from completely disengaging. When the beam deformation is small, when the beam recovers its deformation, it will push the baffle into the groove, causing the retaining ring to spring back and re-clamp, thus avoiding the damage and replacement of the second connector. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is an exploded view of the structure of the present invention;

[0019] Figure 3 This is a top view of the inner transverse connecting steel plate of the present invention;

[0020] Figure 4 This is a top view of the outer transverse connecting steel plate of the present invention;

[0021] Figure 5 This is a front view of the longitudinal connecting steel plate of the present invention;

[0022] Figure 6 This is a schematic diagram of the connection between the channel and the second connector in Embodiment 1 of the present invention;

[0023] Figure 7 This is a schematic diagram of the second connector in Embodiment 1;

[0024] Figure 8 This is a schematic diagram of the built-in steel box in Example 1;

[0025] Figure 9 This is a schematic diagram of a shear bolt.

[0026] Figure 10 This is a cross-sectional schematic diagram of the second connector in Embodiment 2;

[0027] Figure 11 This is a cross-sectional view of the sleeve in Example 2;

[0028] Figure 12 This is a schematic diagram of Example 4;

[0029] Figure 13 This is a schematic diagram of the card and the ring in Example 4.

[0030] Explanation of reference numerals in the attached drawings: 1. Precast column; 2. Precast beam; 3. Precast floor slab; 4. Column protruding corbel; 5. Column end H-beam; 6. Beam end H-beam; 7. Longitudinal connecting steel plate; 8. Outer transverse connecting steel plate; 9. Inner transverse connecting steel plate; 10. Steel rib; 11. Channel; 12. No. 1 stud; 13. Second connector; 14. Circular notch; 15. Arc-shaped notch; 16. Horizontal oblong hole; 17. No. 2 reserved bolt. Hole; 18. No. 1 reserved bolt hole; 19. No. 2 stud; 20. Groove; 21. Shear bolt; 22. Internal steel box; 23. No. 3 stud; 24. Open steel box; 25. No. 3 reserved bolt hole; 26. Spacer; 27. Washer; 28. Nut; 29. ​​Screw; 30. Anchor end; 31. Sleeve; 32. External thread; 33. Bevel; 34. Clamping plate; 35. Elastic clip; 36. Groove; 37. Stop block. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] Reference Figures 1 to 9As shown, a detachable RC beam-column joint with a floor slab according to the present invention includes a precast column 1, a precast beam 2, and a precast floor slab 3. The precast column 1, precast beam 2, and precast floor slab 3 are made of reinforced concrete. The precast column 1 and precast beam 2 are connected by a first connector. The first connector includes a column protrusion bracket 4 provided on the side of the precast column 1. The column protrusion bracket 4 is connected to the column end H-beam 5 by an inlay. The precast beam 2 is connected to the beam end H-beam 6 by an inlay. The first connector also includes a connecting steel plate. The connecting steel plate includes a longitudinal connecting steel plate 7, an outer transverse connecting steel plate 8, and an inner transverse connecting steel plate 9. The outer transverse connecting steel plate 8 and the inner transverse connecting steel plate 9 are referenced. Figure 3 and Figure 4 The structure, designed as a weak point to dissipate energy, features arc-shaped notches 15 cut into both sides of the outer transverse connecting steel plate 8. A circular groove notch 14 is cut into the middle of the inner transverse connecting steel plate 9, weakening the middle section of the transverse connecting steel plates and thus achieving energy dissipation. Second-order pre-drilled bolt holes 17 are provided at the flanges of the column-end H-beam 5 and beam-end H-beam 6 using mechanical drilling. The outer transverse connecting steel plate 8 and the inner transverse connecting steel plate 9 are connected using bolts. (Refer to...) Figure 1 , Figure 2 and Figure 5As shown, the web of the H-beam 5 at the column end and the H-beam 6 at the beam end is provided with a first reserved bolt hole 18 by mechanical drilling. The longitudinal connecting steel plate 7 has horizontal elongated holes 16 on the upper and lower sides and a first reserved bolt hole 18 in the middle. The horizontal elongated holes 16 on the longitudinal connecting steel plate 7 and the first reserved bolt hole 18 on the web of the steel plate correspond to each other. In this way, the beam end and column end of the beam-column joint can have a large rotation space, so that when an earthquake occurs, the energy-dissipating component will deform first after being subjected to force to dissipate the seismic energy and protect the beam-column joint from brittle failure. Preferably, the No. 1 reserved bolt hole 18, the No. 2 reserved bolt hole 17, and the horizontal oblong hole 16 are all connected by frictional high-strength bolts; preferably, the steel section includes an upper flange, a lower flange, and a web, with the upper and lower flanges arranged in parallel, and the web connecting the upper and lower flanges; preferably, the H-beam is a variable cross-section steel section, wherein the steel section in the variable cross-section region and the steel section in the smaller cross-section region are embedded in concrete; the cross-sectional area of ​​the column-end H-beam 5 changes from large to small on the horizontal surface of the column protruding corbel 4; the cross-sectional area of ​​the beam-end H-beam 6 changes from large to small on the horizontal surface of the precast beam 2; the anchorage end 30 of the column-end H-beam 5 is welded with a rib to increase the anchorage strength; preferably... Preferably, H-beams are welded with steel ribs 10, the welding point being the section where the cross-sectional area of ​​the steel section just begins to decrease. The height of the steel ribs 10 is equal to the height of the web of the steel section, and the length of the steel ribs 10 is equal to the width of the flange of the steel section minus the width of the web, divided by two. Preferably, a No. 1 stud 12 is welded to the H-beam 6 at the beam end to increase its anchorage strength with the precast beam 2. Three rows and five columns of 15 No. 1 studs 12 are welded to each side of the web. Preferably, the steel section, the protruding corbel 4 of the column, and the precast beam 2 are parallel. The precast floor slab 3 and the beam-column joint are provided with a connection node for connecting the second connector 13. When the beam end and column end of the beam-column joint experience relative displacement, the connection node of the precast floor slab 3 and the connection node of the beam-column joint can move relative to each other. (Refer to...) Figures 6 to 9 As shown, the connection nodes of the precast floor slab 3 are connected to the channel 11 by an inlay method. Studs pass through the channel 11 and are fixed in the precast floor slab 3. A slot 20 is provided below the channel 11, and steel plates are provided on both sides of the slot 20. The second connecting member 13 also includes a connecting rod and an internal steel box 22. In embodiment 1, the connecting rod is a shear bolt 21, as shown in the reference... Figure 9As shown, the shear bolt 21 consists of a pad 26, a washer 27, a nut 28, and a threaded rod 29. A steel plate at the slot 20 is sandwiched between the pad 26 and the washer 27. The built-in steel box 22 consists of a No. 3 stud 23 and an open steel box 24. The upper part of the steel box is provided with a No. 3 reserved bolt hole 25. In embodiment 1, the yield strength of the open steel box 24 is less than the failure strength of the precast floor slab 3, so that the open steel box 24 can deform before the floor slab and protect it. Preferably, a row of 7 No. 2 studs 19 are welded above the channel 11 to increase its anchorage strength with the precast floor slab 3. Preferably, the connection node of the precast beam 2 is fixed to the open steel box 24 and the studs by embedding.

[0033] In the above embodiment, as a preferred embodiment, a 20mm gap is provided between the column end H-beam 5 and the beam end H-beam 6 to ensure that there is sufficient corner deformation space at the web of the H-beam, allowing the upper connecting steel plate to yield first, making it an energy-dissipating steel plate, increasing the structural toughness of the beam-column joint, and restoring the seismic function of the joint by replacing the energy-dissipating steel plate after the earthquake.

[0034] Embodiment 2 of the second connector 13 is basically the same as Embodiment 1, referring to Figure 10 and Figure 11 As shown, the only difference is that the second connecting member 13 includes a sleeve 31. The sleeve 31 has a stepped surface inside, and the inner wall of the sleeve 31 is polygonal. The lower end of the connecting rod that mates with the sleeve 31 is also polygonal to prevent relative rotation after the sleeve 31 and the connecting rod are mated. The sleeve 31 is fitted onto the lower end of the connecting rod. The outer surface of the sleeve 31 has an external thread 32 and is fixed to the open steel box 24 by a nut 28. The end of the connecting rod has several L-shaped clamping plates 34. The end of the clamping plate 34 has a protrusion that engages with the end of the sleeve 31 to clamp the pad 26 and the upper surface of the open steel box 24 onto the steel plates on both sides of the slot 20. Due to the multiple The clamping plate 34 itself is a weak structure. Therefore, when the column end and beam end connectors rotate relative to each other, the clamping plate 34 deforms or breaks to protect the floor slab. Furthermore, the clamping plate 34 can be provided with a groove or hole in the middle or its thickness can be machined to reduce its structural strength. In this embodiment 2, the clamping plate 34 itself does not need to be used as an energy-dissipating component to absorb seismic energy, but is used to protect the floor slab from cracks and other damage when the beam rotates too much. Since the beam is mainly subjected to the gravity of the floor slab, which is reflected in the second connector 13 mainly acting on the step surface of the sleeve 31, it is feasible to appropriately reduce the strength of the clamping plate 34 structure itself. Embodiment 3 of the second connector 13 is basically the same as that of embodiment 2, except that the outer diameter of the sleeve 31 is larger than the inner diameter of the No. 3 reserved bolt hole 25 on the upper surface of the open steel box 24. When the clamping plate 34 is inserted, the sleeve 31 and the pad 26 clamp the steel plate.

[0035] Embodiment 4 of the second connector is basically the same as Embodiment 2, referring to... Figure 12 and Figure 13 As shown, the only difference is that the middle part of the card plate 34 is provided with several elastic cards 35 and holes, the holes cooperate with the elastic cards 35, the inner wall of the sleeve 31 is provided with a groove 36 that cooperates with the elastic cards 35, the end of the groove 36 facing the floor is provided with a slope 33, the elastic card 35 is provided with a stop block 37 that cooperates with the groove 36, when the sleeve 31 is sleeved on the connecting rod, the elastic card 35 is snapped into the end of the sleeve 31, the stop block 37 is provided at the connection between the groove 36 and the slope 33, and the end of the card plate 34 is a predetermined distance away from the end of the retaining ring. When the beam and column ends rotate during an earthquake, it should be noted that downward rotation of the beam end causes greater destructive force due to the combined weight of the beam and floor slab. Upward rotation, however, is subject to the reverse force of the beam and floor slab weight. Therefore, the primary consideration is the damage caused by downward rotation of the beam end. Downward rotation causes the retaining ring to be stressed. Under instantaneous force, the retaining ring deforms upward, the stop block 37 moves towards the inclined plane 33, and the clip pops out under the compressive force, allowing the open steel box 24 to move downward. When the beam returns to its upward position, the stop block 37 resets, and the end of the clip re-engages with the lower part of the sleeve 31, thus preventing direct damage to the retaining ring and avoiding replacement. The lower end of the retaining ring also prevents the sleeve 31 from detaching from the connecting rod during this process, preventing the floor slab at that connection point from completely separating from the beam. Simultaneously, if the beam deformation is excessive, the weak structure of the retaining ring can also break, causing the beam to separate from the floor slab, protecting the floor slab from damage. After the earthquake, reconnection can be achieved by reconnecting or replacing the accessories of the second connecting piece.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A detachable RC beam-column joint with a floor slab, comprising a precast column, a precast beam, and a precast floor slab, wherein the precast column and the precast beam are connected by a first connector, the first connector comprising an energy-dissipating component, and the beam end and column end of the beam-column joint are rotatable relative to each other such that the energy-dissipating component deforms first under stress, characterized in that: The precast floor slab and beam-column joint is provided with a connection node for connecting a second connector. When the beam end and column end of the beam-column joint are relatively displaced, the connection node of the precast floor slab and the connection node of the beam-column joint can move relative to each other. The second connector includes an open steel box embedded in a precast beam. The connection node of the precast floor slab is provided with a channel, which includes a bottom opening and steel plates on both sides of the opening. The second connector also includes a connecting rod, which includes pads that cooperate with the steel plates on both sides of the opening. The connecting rod passes through the upper surface of the open steel box and is fixed to the open steel box so that the pads and the open steel box are clamped on the steel plates on both sides of the opening.

2. The detachable RC beam-column joint with a floor slab according to claim 1, characterized in that: The second connector includes a sleeve with a stepped surface inside. The sleeve is fixed to the open steel box. The lower end of the connecting rod has a shape that matches the stepped surface of the sleeve, so that the sleeve is fitted onto the lower end of the connecting rod. The end of the connecting rod is provided with an L-shaped clamping plate. The clamping plate engages with the end of the sleeve, so that the pad and the upper surface of the open steel box are clamped on the steel plates on both sides of the slot.

3. A detachable RC beam-column joint with a floor slab according to claim 2, characterized in that: The yield strength of the open steel box is less than the breaking strength of the precast floor slab.

4. A detachable RC beam-column joint with a floor slab according to claim 3, characterized in that: The card plate has structurally weak points.

5. A detachable RC beam-column joint with a floor slab according to claim 3, characterized in that: The card plate has several elastic cards and holes in the middle, and the holes cooperate with the elastic cards. The sleeve has a groove that cooperates with the elastic cards. The end of the groove facing the floor slab has an inclined surface. The elastic card has a stop block that cooperates with the groove. When the sleeve is fitted onto the connecting rod, the elastic card is engaged at the end of the sleeve. The stop block is located at the connection between the groove and the inclined surface. The end of the card plate is a predetermined distance away from the end of the elastic card.

6. A detachable RC beam-column joint with a floor slab according to claim 5, characterized in that: The channel and the open steel box are equipped with studs, which are embedded in the concrete structure.

7. A detachable RC beam-column joint with a floor slab according to any one of claims 1, 2, 4, 5, or 6, characterized in that: The first connector includes a protruding corbel on the side of the precast column, a connecting H-beam at the column end of the protruding corbel, and a connecting H-beam at the beam end of the precast beam. The column-end H-beam and the beam-end H-beam are connected by connecting steel plates. The connecting steel plates include a longitudinal connecting steel plate, an outer transverse connecting steel plate, and an inner transverse connecting steel plate. The outer transverse connecting steel plate and the inner transverse connecting steel plate have structural weak points and are used to connect to the flanges of the column-end H-beam and the beam-end H-beam. Bolt holes are pre-drilled in the web of the end H-beam, and horizontal elongated holes are opened on the upper and lower sides of the longitudinal connecting steel plate. Bolt holes are pre-drilled in the middle of the longitudinal connecting steel plate. The elongated holes and pre-drilled bolt holes of the longitudinal connecting steel plate correspond to the pre-drilled bolt holes in the web of the column end H-beam and the beam end H-beam, and are fixed by bolts. The column end H-beam and the beam end H-beam have rotation space, so that when subjected to external force, the outer transverse connecting steel plate and the inner transverse connecting steel plate will yield and deform first.

8. A detachable RC beam-column joint with a floor slab according to claim 7, characterized in that: A gap is reserved between the H-beam at the column end and the H-beam at the beam end.

9. A detachable RC beam-column joint with a floor slab according to claim 7, characterized in that: The beam end H-beam is welded with studs, and studs are welded to both sides of the web.

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