Connecting structure and construction method of seismic isolation support and first layer prefabricated RC hollow column

Abstract

A kind of connecting structure and construction method of seismic isolation support and first layer prefabricated RC hollow column, including step one, preparation of the seismic isolation support containing shear pin bolt.Step two, preparation of first layer prefabricated RC hollow column, the horizontal column plate with hole is temporarily anchored on vertical reinforcement by nut, then four steel plates are welded to form steel hoop cylinder.Step three, steel hoop cylinder is sleeved in the lower part of first layer prefabricated RC hollow column, and welding connection between horizontal column plate and steel hoop cylinder.Step four, hoist first layer prefabricated RC hollow column, so that shear pin bolt is inserted into the cavity of first layer prefabricated RC hollow column;Step five, carry out the upper connecting plate butt welding of steel hoop cylinder in the lower part of first layer prefabricated RC hollow column and seismic isolation support;Step six, install temporary inclined support, pour the concrete of the cavity of first layer prefabricated RC hollow column, thus the connecting structure construction of first layer prefabricated RC hollow column and seismic isolation support is completed.The present application solves the technical problems that the bearing capacity of traditional building node is not enough, and the deformation capacity and seismic performance of building structure are weak.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology, specifically a connection structure and construction method for a seismic isolation bearing and a precast RC hollow column on the first floor. Background Technology

[0002] my country's prefabricated building industry has been developing for more than 70 years, from the initial manual operation to mechanized production, from learning from advanced foreign technologies to being able to innovate independently, experiencing both highs and lows along the way.

[0003] With economic and technological development, the advantages of cast-in-place construction have gradually disappeared, and prefabricated construction has become a key development direction for my country's construction industry. Meanwhile, over the past five years, the government has successively introduced many crucial policies to vigorously promote the development of prefabricated construction. As a crucial vertical support component in prefabricated construction, RC (Reinforced Concrete) columns, and as an important part of seismic isolation buildings, require in-depth research on column foundation connection nodes, which has a decisive impact on promoting the application and development of prefabricated construction.

[0004] High-safety buildings must adhere to the principles of "strong shear, weak bending" and "strong nodes, weak members," with the treatment of nodes being particularly crucial. "Strong shear, weak bending" means ensuring that the shear resistance of structural members is better than their bending resistance. Shear failure is a brittle failure that occurs instantaneously without warning. In engineering, we need to avoid shear failure or prevent it from occurring before ductile failure. "Strong nodes, weak members" emphasizes the importance of node connections, requiring that the load-bearing capacity of building nodes be stronger than that of individual members, thereby improving the deformation capacity of the building structure and enhancing its seismic performance. Summary of the Invention

[0005] The purpose of this invention is to provide a connection structure and construction method for seismic isolation bearings and precast RC hollow columns on the first floor, in order to solve the technical problems of insufficient bearing capacity at traditional building joints and weak deformation capacity and seismic performance of building structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A connection structure between a seismic isolation bearing and a first-floor precast RC hollow column includes a first-floor precast RC hollow column and a seismic isolation bearing. A cavity is vertically continuous within the first-floor precast RC hollow column, and the lower ends of the vertical reinforcing bars in the first-floor precast RC hollow column extend beyond the bottom surface of the column. Threads are provided on the portion of the vertical reinforcing bars extending beyond the bottom surface of the first-floor precast RC hollow column. A steel hoop is provided at the lower part of the first-floor precast RC hollow column. The lower end of the steel hoop extends beyond the bottom surface of the first-floor precast RC hollow column, and a horizontal column plate is provided within the cavity of the steel hoop at the bottom surface of the first-floor precast RC hollow column. Holes are provided on the horizontal column plate corresponding to the cavity. The diameter of the holes is larger than the diameter of the cavity, and a slot is provided on the opposite side of the holes. The slot is horizontally T-shaped, and the horizontal end of the slot communicates with the hole. The horizontal column plate has a first through-bar hole at the position corresponding to the vertical reinforcement; the top of the seismic isolation bearing has a shear pin; the horizontal cross-section of the shear pin is I-shaped, and the two flanges of the shear pin are respectively set to correspond to the longitudinal edges of the two slots; the upper connecting plate of the seismic isolation bearing is inserted into the lower part of the steel hoop cylinder, and a second through-bar hole is set on the upper connecting plate at the position corresponding to the first through-bar hole; the shear pin passes through the hole and extends into the cavity of the first-floor precast RC hollow column, and the two flanges of the shear pin are respectively inserted into the longitudinal edges of the two slots; the lower end of the vertical reinforcement passes through the first through-bar hole and the second through-bar hole in sequence, and the upper connecting plate and the horizontal column plate are fixed by nuts on the vertical reinforcement through threaded connection; the gap between the first-floor precast RC hollow column and the seismic isolation bearing and the cavity of the first-floor precast RC hollow column are filled with concrete.

[0008] Preferably, the length of the lower end of the steel hoop extending beyond the bottom surface of the first-layer precast RC hollow column is adapted to the thickness of the upper connecting plate; the length of the steel hoop clamped on the first-layer precast RC hollow column is 20cm to 50cm.

[0009] Preferably, the four sides of the upper connecting plate are in contact with the four inner sides of the steel hoop, and the upper connecting plate and the steel hoop are welded together.

[0010] Preferably, the length of the shear pin extending into the cavity is 20cm to 50cm.

[0011] Preferably, the concrete filling the cavity is ultra-high strength and high ductility concrete or high-performance recycled concrete.

[0012] Preferably, the cross-sectional shape of the first-layer prefabricated RC hollow column is adapted to the planar shape of the upper connecting plate, and the cross-sectional dimensions of the first-layer prefabricated RC hollow column are adapted to the planar dimensions of the upper connecting plate.

[0013] A construction method for a connection structure between a seismic isolation bearing and a precast RC hollow column on the first floor includes the following steps.

[0014] Step 1: Prepare the seismic isolation bearing with shear pins: Position and correct the shear pins, and weld the shear pins to the top of the upper connecting plate of the seismic isolation bearing.

[0015] Step 2: Prepare the first-floor precast RC hollow columns. The horizontal column slab with holes is temporarily anchored to the vertical reinforcing bars with nuts. Then, four steel plates are welded together to form a steel hoop cylinder.

[0016] Step 3: Fit the steel hoop sleeve onto the lower part of the first-floor precast RC hollow column, and weld the horizontal column slab to the steel hoop sleeve.

[0017] Step 4: Hoist the first-floor precast RC hollow column, position and align the first-floor precast RC hollow column, unscrew the nuts, and insert the shear pin into the cavity of the first-floor precast RC hollow column.

[0018] Step 5: Construct the butt weld between the steel hoop at the bottom of the first-floor precast RC hollow column and the upper connecting plate of the seismic isolation bearing, and then tighten the nut onto the vertical reinforcing bar at the bottom of the upper connecting plate.

[0019] Step 6: Install temporary inclined supports and pour concrete into the cavities of the first-floor precast RC hollow columns.

[0020] Step 7: Remove the temporary diagonal supports. At this point, the construction of the connection structure between the first-floor precast RC hollow columns and the seismic isolation bearings is completed.

[0021] At this point, the construction of the connection structure between the first-floor precast RC hollow columns and the seismic isolation bearings is complete.

[0022] Compared with the prior art, the present invention has the following features and beneficial effects.

[0023] 1. This invention uses precast RC hollow columns on the first floor as the frame columns of a precast assembled concrete structure, which can significantly save concrete usage, thereby reducing the structural self-weight. Furthermore, the precast RC hollow columns on the first floor can be quickly assembled with the seismic isolation bearings via welding using steel hoops. Additionally, this invention employs a cast-in-place method to simultaneously pour concrete into the column cavities and foundation column joint areas, achieving the connection between the precast RC hollow columns on the first floor and the seismic isolation bearings. Therefore, this invention, while using precast RC hollow columns on the first floor as frame columns to reduce structural self-weight, also utilizes seismic isolation bearings with shear pins in the foundation to meet the stress requirements of the joints under horizontal loads and bending moments, improving the safety of the joints under seismic action. It has the advantages of saving concrete usage and reducing foundation costs.

[0024] 2. This invention uses precast RC hollow columns in the first layer, which is convenient for production, transportation and construction. The gap between the precast RC hollow columns in the first layer and the seismic isolation bearings and the cavities of the precast assembly in each layer are filled with ultra-high strength and high ductility concrete or high performance recycled concrete, so as to achieve sustainable low-carbon green development. The horizontal column slabs and steel hoops and the steel hoops and the upper connecting plates are connected by manual or robotic welding. By filling the connection node area between the precast RC hollow columns in the first layer and the seismic isolation bearings with ultra-high strength and high ductility concrete or high performance recycled concrete, the core area of ​​the solid column foundation has good seismic toughness, which is conducive to functional recovery after strong earthquakes and has good durability. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure in this invention where a steel hoop is installed at the bottom of the first-layer precast RC hollow column.

[0028] Figure 3 This is a schematic diagram of the structure in this invention where an anti-shear pin is installed at the top of the seismic isolation bearing.

[0029] Figure 4 This is a diagram showing the state of the seismic isolation bearing before it is connected to the precast RC hollow column on the first floor in this invention.

[0030] Figure 5 This is a schematic diagram of the structure in which the anti-shear pin is inserted into the cavity in this invention.

[0031] Figure 6 This is a schematic diagram of the horizontal column slab structure in this invention.

[0032] Figure reference numerals: 1-seismic isolation bearing, 1.1-upper connecting plate, 2-first-floor precast RC hollow column, 2.1-vertical reinforcement, 3-slot, 4-cavity, 5-steel hoop, 6-horizontal column slab, 7-first through-bar hole, 8-hole, 9-shear pin, 10-second through-bar hole, 11-nut. Detailed Implementation

[0033] like Figure 1-6As shown, this connection structure between the seismic isolation bearing and the first-floor precast RC hollow column includes a first-floor precast RC hollow column 2 and a seismic isolation bearing 1. A cavity 4 is provided vertically along the entire length of the first-floor precast RC hollow column 2, and the lower end of the vertical reinforcing bar 2.1 in the first-floor precast RC hollow column 2 extends beyond the bottom surface of the first-floor precast RC hollow column 2. Threads are provided at the portion of the vertical reinforcing bar 2.1 that extends beyond the bottom surface of the first-floor precast RC hollow column 2. A steel... A hoop 5; the lower end of the steel hoop 5 extends beyond the bottom surface of the first-floor precast RC hollow column 2, and a horizontal column-laying plate 6 is provided in the inner cavity of the steel hoop 5 at the position of the bottom surface of the first-floor precast RC hollow column 2; a hole 8 is provided on the horizontal column-laying plate 6 at the position corresponding to the cavity 4; the diameter of the hole 8 is larger than the diameter of the cavity 4, and a slot 3 is provided on the opposite side of the hole 8; the slot 3 is horizontally T-shaped, and the horizontal end of the slot 3 communicates with the hole 8; the horizontal column-laying plate 6 is provided in a horizontal position. A first through-reinforcement hole 7 is provided on the plate 6 at the position corresponding to the vertical reinforcement 2.1; a shear pin 9 is provided on the top of the seismic isolation bearing 1; the horizontal cross-section of the shear pin 9 is I-shaped, and the two flanges of the shear pin 9 are respectively provided corresponding to the longitudinal edges of the two slots 3; the upper connecting plate 1.1 of the seismic isolation bearing 1 is inserted into the lower part of the steel hoop cylinder 5, and a second through-reinforcement hole 10 is provided on the upper connecting plate 1.1 at the position corresponding to the first through-reinforcement hole 7; the shear pin 9 passes through the hole. 8 extends into the cavity 4 of the first-layer precast RC hollow column 2, and the two flanges of the shear pin 9 are respectively inserted into the longitudinal sides of the two side slots 3; the lower end of the vertical steel bar 2.1 passes through the first through hole 7 and the second through hole 10 in sequence, and the upper connecting plate 1.1 and the horizontal column plate 6 are fixed to the vertical steel bar 2.1 by the nut 11 threadedly connected to the vertical steel bar 2.1; the gap between the first-layer precast RC hollow column 2 and the seismic isolation support 1 and the cavity 4 of the first-layer precast RC hollow column 2 are filled with concrete.

[0034] In this embodiment, the length of the lower end of the steel hoop 5 extending beyond the bottom surface of the first-layer precast RC hollow column 2 is adapted to the thickness of the upper connecting plate 1.1; the length of the steel hoop 5 clamped on the first-layer precast RC hollow column 2 is 20cm~50cm.

[0035] In this embodiment, the four sides of the upper connecting plate 1.1 are in contact with the four inner sides of the steel hoop cylinder 5, and the upper connecting plate 1.1 and the steel hoop cylinder 5 are welded together.

[0036] In this embodiment, the length of the anti-shear pin 9 extending into the cavity is 20cm to 50cm.

[0037] In this embodiment, the concrete filling the cavity 4 is ultra-high strength and high ductility concrete or high-performance recycled concrete.

[0038] In this embodiment, the cross-sectional shape of the first-layer prefabricated RC hollow column 2 is adapted to the planar shape of the upper connecting plate 1.1, and the cross-sectional dimensions of the first-layer prefabricated RC hollow column 2 are adapted to the planar dimensions of the upper connecting plate 1.1.

[0039] In this embodiment, the steel hoop 5 is welded to the horizontal column plate 6 at the bottom of the first-floor precast RC hollow column 2.

[0040] The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor includes the following steps.

[0041] Step 1, prepare the seismic isolation bearing 1 containing the shear pin 9: locate and correct the shear pin 9, and weld the shear pin 9 to the top of the upper connecting plate 1.1 of the seismic isolation bearing 1.

[0042] Step 2: Prepare the first-floor precast RC hollow column 2. The horizontal column plate 6 with holes 8 is temporarily anchored to the vertical steel bar 2.1 with nuts 11. Then, the four steel plates are welded to form a steel hoop cylinder 5.

[0043] Step 3: Fit the steel hoop 5 onto the lower part of the first-floor precast RC hollow column 2, and weld the horizontal column plate 6 to the steel hoop 5.

[0044] Step 4: Hoist the first-floor precast RC hollow column 2, position and correct the first-floor precast RC hollow column 2, unscrew the nut 11, and insert the shear pin 9 into the cavity 4 of the first-floor precast RC hollow column 2.

[0045] Step 5: Construct the butt weld between the steel hoop 5 at the bottom of the first-floor precast RC hollow column 2 and the upper connecting plate 1.1 of the seismic isolation bearing 1, and then screw the nut 11 onto the vertical reinforcing bar 2.1 at the bottom of the upper connecting plate 1.1.

[0046] Step 6: Install temporary inclined supports and pour concrete into the cavity 4 of the first-floor precast RC hollow column 2.

[0047] Step 7: Remove the temporary diagonal supports. At this point, the construction of the connection structure between the first-floor precast RC hollow column 2 and the seismic isolation bearing 1 is completed.

[0048] In this embodiment, the seismic isolation bearing 1 is a lead-core rubber bearing or a laminated rubber seismic isolation bearing.

[0049] In this embodiment, the vertical reinforcing bar 2.1 extends a portion from the upper end of the first-floor precast RC hollow column 2 as a reserved reinforcing bar. The horizontal column plate 6 with an opening at the lower end of the first-floor precast RC hollow column 2 is temporarily anchored to the lower part of the vertical reinforcing bar 2.1 by the reinforcing bar anchoring nut 11. Four steel plates are welded to form a rectangular cylinder. The horizontal column plate 6 inside the cylinder has a hole 8 in the center that can insert the shear pin 9. The steel hoop cylinder 5 is welded to the upper connecting plate 1.1 of the seismic isolation bearing 1. The shear pin 9 welded to the upper connecting plate 1.1 of the seismic isolation bearing 1 can be inserted into the cavity 4 at the lower end of the first-floor precast RC hollow column 2.

[0050] In this embodiment, the seismic isolation bearing 1 and the shear pin 9 together constitute the seismic isolation foundation.

[0051] In this embodiment, the steel hoop 5 at the end of the first-layer precast RC hollow column 2 is welded and fixed to the upper connecting plate 1.1 by manual or robotic welding.

[0052] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A connection structure between a seismic isolation bearing and a first-floor precast RC hollow column, comprising a first-floor precast RC hollow column (2) and a seismic isolation bearing (1); characterized in that: A cavity (4) is provided along the vertical length of the first-layer precast RC hollow column (2), and the lower end of the vertical reinforcing bar (2.1) in the first-layer precast RC hollow column (2) extends beyond the bottom surface of the first-layer precast RC hollow column (2); a thread is provided on the part of the vertical reinforcing bar (2.1) that extends beyond the bottom surface of the first-layer precast RC hollow column (2); a steel hoop (5) is provided at the lower part of the first-layer precast RC hollow column (2); the lower end of the steel hoop (5) extends beyond the bottom surface of the first-layer precast RC hollow column (2), and a thread is provided in the inner cavity of the steel hoop (5) at the position of the bottom surface of the first-layer precast RC hollow column (2). A horizontal column plate (6); a hole (8) is provided on the horizontal column plate (6) at the position corresponding to the cavity (4); the diameter of the hole (8) is larger than the diameter of the cavity (4), and a slot (3) is provided on the opposite side of the hole (8); the slot (3) is in the shape of a horizontal T, and the horizontal end of the slot (3) is connected to the hole (8); a first through hole (7) is provided on the horizontal column plate (6) at the position corresponding to the vertical reinforcement (2.1); a shear pin (9) is provided on the top of the seismic isolation bearing (1); the horizontal cross-section of the shear pin (9) is I-shaped, and the shear pin (9) The two flanges of the ) are respectively set to correspond to the longitudinal sides of the two slots (3); the upper connecting plate (1.1) of the seismic isolation bearing (1) is inserted into the lower part of the steel hoop cylinder (5), and a second through-bar hole (10) is set on the upper connecting plate (1.1) at the position corresponding to the first through-bar hole (7); the shear pin (9) passes through the hole (8) and extends into the cavity (4) of the first-floor precast RC hollow column (2), and the two flanges of the shear pin (9) are respectively inserted into the longitudinal sides of the two slots (3); the lower end of the vertical steel bar (2.1) passes through the first through-bar hole (7) and the second through-bar hole (10) in sequence, and The upper connecting plate (1.1) and the horizontal column plate (6) are fixed by nuts (11) on the vertical reinforcing bars (2.1) through threaded connection; the gap between the first-floor precast RC hollow column (2) and the seismic isolation support (1) and the cavity (4) of the first-floor precast RC hollow column (2) are filled with concrete; the length of the lower end of the steel hoop (5) extending beyond the bottom surface of the first-floor precast RC hollow column (2) is adapted to the thickness of the upper connecting plate (1.1); the four sides of the upper connecting plate (1.1) are in contact with the four sides of the inner side of the steel hoop (5), and the upper connecting plate (1.1) and the steel hoop (5) are welded together.

2. The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor according to claim 1, characterized in that: The steel hoop (5) is attached to the precast RC hollow column (2) on the first floor for a length of 20cm to 50cm.

3. The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor according to claim 1, characterized in that: The shear pin (9) extends into the cavity for a length of 20cm to 50cm.

4. The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor according to claim 1, characterized in that: The concrete filling the cavity (4) is ultra-high strength and high ductility concrete or high performance recycled concrete.

5. The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor according to claim 1, characterized in that: The cross-sectional shape of the first-layer prefabricated RC hollow column (2) is adapted to the planar shape of the upper connecting plate (1.1), and the cross-sectional dimensions of the first-layer prefabricated RC hollow column (2) are adapted to the planar dimensions of the upper connecting plate (1.1).

6. The connection structure between the seismic isolation bearing and the precast RC hollow column on the first floor according to claim 1, characterized in that, The steps include the following: Step 1, prepare the seismic isolation bearing (1) containing shear pins (9): locate and correct the shear pins (9), and weld the shear pins (9) to the top of the upper connecting plate (1.1) of the seismic isolation bearing (1); Step 2: Prepare the first-floor precast RC hollow column (2), and temporarily anchor the horizontal column plate (6) with holes (8) to the vertical steel bar (2.1) with nuts (11). Then weld the four steel plates to form a steel hoop cylinder (5). Step 3: Fit the steel hoop cylinder (5) onto the lower part of the first-floor precast RC hollow column (2), and weld the horizontal column plate (6) to the steel hoop cylinder (5). Step 4: hoist the first-floor precast RC hollow column (2), position and correct the first-floor precast RC hollow column (2), unscrew the nut (11), and insert the shear pin (9) into the cavity (4) of the first-floor precast RC hollow column (2); Step 5: Construct the butt weld between the steel hoop (5) at the bottom of the first-floor precast RC hollow column (2) and the upper connecting plate (1.1) of the seismic isolation bearing (1), and then screw the nut (11) onto the vertical steel bar (2.1) at the bottom of the upper connecting plate (1.1); Step 6: Install temporary inclined supports and pour concrete for the cavity (4) of the first-floor precast RC hollow column (2); Step 7: Remove the temporary diagonal support. At this point, the construction of the connection structure between the first-floor precast RC hollow column (2) and the seismic isolation bearing (1) is completed.

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