Construction of connection nodes between the outer wall and floor slab of the seismic isolation layer

Abstract

This invention relates to the field of seismic isolation structure technology, specifically a connection node structure between the outer wall and the floor slab of a seismic isolation layer. It includes fixed bases arranged in two rows along the length of the outer wall, anchored to the top surface of the outer wall and the bottom surface of the first-floor slab, respectively. Several fireproof pipes are installed between the two rows of fixed bases, with one end connected to a fixed base and the other end forming an elastic abutment structure with the opposite fixed base. This invention, through the elastic abutment of the fireproof pipe ends, can buffer the rigid collision between the upper and lower bases and the fireproof pipes when the seismic isolation structure undergoes horizontal relative displacement, preventing component damage. Simultaneously, the separate upper and lower bases combined with the fireproof pipes can accommodate large deformation displacements of the seismic isolation layer, ensuring the integrity of the fireproof sealing of gaps while meeting seismic isolation slip requirements. The structure is simple and reliable, effectively improving the seismic durability of the connection node of the seismic isolation outer wall.

Description

Technical Field

[0001] This invention relates to the field of seismic isolation structure technology, specifically to a connection node structure between the outer wall of the seismic isolation layer and the floor slab. Background Technology

[0002] A seismic isolation structure is a system of seismic isolation bearings installed between the foundation and the main structure of a building. Through the elastic deformation and damping energy dissipation of the isolation devices, the upward transmission of seismic energy is reduced, thereby decreasing the seismic response of the superstructure and improving overall seismic performance. To accommodate the significant horizontal relative slippage between the upper floor slab and the lower exterior wall under seismic action, a vertical isolation joint must be reserved between the top surface of the exterior wall at the isolation layer and the bottom surface of the first-floor slab. This joint must be fireproofed to prevent smoke and fire from spreading through the joint and creating a chimney effect.

[0003] The connection nodes between the seismic isolation layer exterior wall and the floor slab used in the current project will have two rows of fixed bases anchored on the top surface of the exterior wall and the bottom surface of the first floor slab along the length of the exterior wall. The two sets of bases are arranged opposite each other, and limiting components are assembled between the bases. One end of the limiting component is rigidly fixed to the base, and the other end is directly in rigid contact with the limiting component on the opposite side.

[0004] Traditional nodes lack elastic buffering structures between the ends of limiting components. During an earthquake, the ends of the components on both sides collide directly with rigid force. Long-term reciprocating vibration can easily cause deformation and damage to the components. Furthermore, there is no automatic reset capability after an earthquake. After the components shift due to earthquake, they cannot return to their original positions, which will continuously damage the integrity of the gap seal. Therefore, it is necessary to design a new type of connection node structure between the outer wall and the floor slab of the seismic isolation layer. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a connection node structure between the outer wall of the seismic isolation layer and the floor slab.

[0006] The technical solution adopted by this invention to solve its technical problem is: A connection node structure between the outer wall and the floor slab of a seismic isolation layer includes a fixed base. The fixed base is arranged in two rows along the length of the outer wall. The two rows of fixed bases are respectively anchored to the top surface of the outer wall and the bottom surface of the first floor slab. Several fireproof pipes are arranged between the two rows of fixed bases. One end of the fireproof pipe is connected to the fixed base, and the other end forms an elastic abutment structure with the fixed base on the opposite side.

[0007] As a preferred embodiment, a further technical solution of the present invention is: Preferably, the fixed base is also provided with an internal threaded hole, and the fixed connection end of the fireproof pipe is provided with an external threaded joint, which is threadedly connected to the internal threaded hole.

[0008] Preferably, the fixed base forms an elastic contact structure with the end of the fireproof pipe through a buffer mechanism; the buffer mechanism includes a guide groove opened on the fixed base, a push plate slidably installed in the guide groove, and an elastic element provided in the guide groove. One end of the elastic element abuts against the inner wall of the guide groove, and the other end abuts against the push plate. A buffer column is fixed on the side of the push plate away from the elastic element, and one end of the buffer column penetrates the fixed base and abuts against the end of the fireproof pipe.

[0009] Preferably, a positioning pin is fixedly installed at the end of the buffer column facing the fireproof pipe, and a matching positioning hole is opened at the connecting end of the fireproof pipe. The positioning pin and the positioning hole are fitted with a gap.

[0010] Preferably, a flexible buffer pad is provided on the end face of the end of the buffer column that abuts against the fireproof pipe, located outside the positioning pin. The flexible buffer pad has a ring structure.

[0011] Preferably, the fixed base has a through groove that communicates with the guide slide, and the buffer column is slidably connected in the through groove.

[0012] Preferably, the fireproof pipe and the fixing base are coated with an elastic limiting layer on their outer sides.

[0013] Preferably, a fireproof cloth is provided on the outer side of the elastic limiting layer. The fireproof cloth is laid along the entire length of the outer wall, and the upper and lower ends of the fireproof cloth are fixed to the bottom surface of the floor slab and the top surface of the outer wall, respectively. The fireproof cloth is arranged in a wavy shape.

[0014] Preferably, it also includes several fireproof columns, which are set in the concave bend of the corrugated fireproof cloth. The lower end of the fireproof column is fixed to the top surface of the exterior wall, and the upper end leaves a gap with the bottom surface of the floor slab.

[0015] Preferably, the fireproof column is filled with fireproof rock wool powder, and its lower peripheral wall has multiple leakage holes that communicate with the internal cavity.

[0016] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: First, an elastic abutment structure is installed between the upper and lower rows of fixed bases. When the exterior wall and floor slab experience horizontal relative displacement under earthquake conditions, the elastic structure can buffer the impact of collisions at the ends of the components, reducing damage to the components caused by hard impacts. After the earthquake ends, the elastic component can rebound autonomously, allowing the ends of the fireproof pipe to return to their fitted state, preventing long-term misalignment of the gap seal. Second, the outer side uses a corrugated fireproof cloth. Compared to traditional straight fireproof cloth, the pleated structure reduces the risk of tearing and failure of the fireproof cloth, and stably maintains the fireproof sealing effect of the gaps. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the connection node between the outer wall of the seismic isolation layer and the floor slab in a specific embodiment of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is an exploded structural diagram of the fixed base in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the connection node structure between the fixed base and the fireproof pipe in a specific embodiment of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Fixed base; 101. Internal threaded hole; 2. Buffer mechanism; 201. Buffer column; 2011. Positioning pin; 2012. Buffer pad; 202. Guide groove; 203. Push plate; 204. Elastic element; 205. Through groove; 3. Elastic limiting layer; 4. Fireproof pipe; 401. Positioning hole; 402. External threaded joint; 5. Fireproof cloth; 6. Fireproof column; 601. Material leakage hole. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0020] like Figures 1 to 4 As shown in the figure, this embodiment provides a connection node structure between the outer wall of the seismic isolation layer and the floor slab, including a fixed base 1. The fixed base 1 is arranged in two rows along the length of the outer wall. The two rows of fixed base 1 are respectively anchored to the top surface of the outer wall and the bottom surface of the first floor slab. Several fireproof pipes 4 are arranged between the two rows of fixed base 1. One end of the fireproof pipe 4 is connected to the fixed base 1, and the other end forms an elastic abutment structure with the fixed base 1 on the opposite side.

[0021] As a further improvement of the present invention, adjacent fireproof pipes 4 are arranged in a staggered pattern. Specifically, in two adjacent fireproof pipes 4, the upper end of one fireproof pipe 4 is fixedly connected to the upper row of fixed bases 1, and the lower end is elastically abutted against the lower row of fixed bases 1; the lower end of the other fireproof pipe 4 is fixedly connected to the lower row of fixed bases 1, and the upper end is elastically abutted against the upper row of fixed bases 1. This arrangement is repeated along the length of the outer wall. This staggered arrangement has the following advantages: First, balanced stress distribution. The upper and lower rows of buffer mechanisms 2 alternately bear the seismic impact, avoiding concentrated wear on one side of the components and extending the overall service life. Second, bidirectional adaptability. Regardless of whether the horizontal displacement during an earthquake is to the left or right, some of the elastic abutting ends of the fireproof pipes 4 are in a compressed buffer state, achieving balanced adaptation to bidirectional displacement. Third, mutual backup. Adjacent fireproof pipes 4 face opposite directions; even if individual components are damaged, the remaining fireproof pipes 4 can still independently perform fireproof sealing functions, preventing the entire seismic isolation joint from failing.

[0022] The specific structure for connecting one end of the fireproof pipe 4 to the fixed base 1 is as follows: the fixed base 1 has an internal threaded hole 101, and the fixed connection end of the fireproof pipe 4 is provided with an external threaded connector 402, which is threadedly connected to the internal threaded hole 101. Through this threaded connection structure, the fireproof pipe 4 can be detachably installed on the fixed base 1, facilitating future replacement or maintenance. This threaded connection method is simple in structure and easy to process, suitable for working conditions where the deformation and displacement of the seismic isolation layer are small or the seismic fortification requirements are low.

[0023] In another embodiment of the present invention, the specific structure for connecting one end of the fireproof pipe 4 to the fixed base 1 is as follows: a ball-and-socket seat is provided on the fixed base 1, and a ball-head rod adapted to the ball-and-socket seat is fixedly connected to the fixed connection end of the fireproof pipe 4. The ball-head rod is movably embedded in the ball-and-socket seat, and a limiting pressure ring is fixedly installed at the opening of the ball-and-socket seat. The inner wall of the limiting pressure ring is an arc-shaped surface adapted to the outer circumference of the ball-head rod, and a swing gap is left between the inner wall of the limiting pressure ring and the ball-head rod. Through the spherical hinge connection between the ball-head rod and the ball-and-socket seat, the fixed connection end of the fireproof pipe 4 can rotate omnidirectionally relative to the fixed base 1 within the swing gap range of the limiting pressure ring. When the external wall and the floor slab undergo horizontal relative displacement under earthquake action, the bending moment borne by the fixed end of the fireproof pipe 4 can be released through the rotation of the ball hinge, avoiding stress concentration at the connection root and causing component fracture and damage. This is especially suitable for engineering application scenarios in large deformation isolation layers or high-intensity earthquake zones.

[0024] Compared to traditional rigid fixing methods, this invention uses the above two fixed connection structures: the threaded connection scheme focuses on construction convenience and maintainability, while the ball joint connection scheme focuses on releasing bending moment stress and adapting to large deformation displacement. In actual engineering, the two can be flexibly selected according to the design displacement of the seismic isolation layer and the seismic fortification intensity, taking into account the connection reliability and structural safety under different working conditions.

[0025] The fixed base 1 forms an elastic abutment structure with the end of the fireproof pipe 4 through the buffer mechanism 2. The buffer mechanism 2 includes a guide groove 202 opened on the fixed base 1, a push plate 203 slidably installed in the guide groove 202, and an elastic element 204 provided in the guide groove 202. One end of the elastic element 204 abuts against the inner wall of the guide groove 202, and the other end abuts against the push plate 203. A buffer post 201 is fixed on the side of the push plate 203 away from the elastic element 204, and one end of the buffer post 201 penetrates through the fixed base 1 and abuts against the end of the fireproof pipe 4. The fixed base 1 is provided with a through groove 205 that communicates with the guide groove 202, and the buffer post 201 is slidably connected in the through groove 205.

[0026] The elastic element 204 can be a compression spring, or any one of a disc spring, wave spring, polyurethane elastomer, or gas spring, as long as it has the ability to store elastic potential energy after being compressed and release energy to drive the buffer column 201 to return to its original position after the external force is released. Those skilled in the art can flexibly select from the above-mentioned elastic elements 204 according to the design displacement of the seismic isolation layer, installation space, and cost requirements, all of which are equivalent alternatives to the technical solution of this invention.

[0027] A positioning pin 2011 is fixedly installed at one end of the buffer column 201 facing the fireproof pipe 4. A matching positioning hole 401 is opened at the connecting end of the fireproof pipe 4. The positioning pin 2011 and the positioning hole 401 are fitted with a gap to achieve coaxial positioning and limiting of the buffer column 201 and the fireproof pipe 4. Because the other end of the fireproof pipe 4 is threaded to the fixed base 1, the upper and lower fireproof pipes 4 will be horizontally misaligned with the floor slab and the exterior wall. The gap of the insertion can accommodate a small lateral offset, prevent the components from completely separating, and always ensure that the force is transmitted along the axis.

[0028] Furthermore, to effectively accommodate the significant horizontal relative displacement between the exterior wall and floor slab under earthquake conditions and ensure automatic post-earthquake reset, the end of the positioning pin 2011 facing the fireproof pipe 4 has a truncated cone structure, which is matched with the positioning hole 401. The angle between the generatrix of the conical surface of the positioning pin 2011 and the axial direction is 15°-30°, the taper of the positioning hole 401 is consistent with that of the positioning pin 2011, and a clearance fit is used between them. Under normal use, the small end of the guide positioning pin 2011 is inserted into the bottom of the flared guide hole to achieve coaxial positioning and limiting of the buffer column 201 and the fireproof pipe 4. When an earthquake causes horizontal misalignment of the upper and lower fireproof pipes 4, the inner conical wall of the positioning hole 401 and the outer conical wall of the positioning pin 2011 form a sliding wedge fit. The radial component of the force generated by the conical interference converts the horizontal misalignment into axial displacement that pushes the elastic element 204 of the buffer column 201, thereby absorbing impact energy and buffering rigid collisions. At the same time, the self-centering guiding characteristic of the conical fit allows the positioning pin 2011 to automatically slide into the positioning hole 401 along the conical surface under the action of spring thrust, even if the upper and lower components are significantly misaligned, effectively preventing the components from completely separating. After the earthquake, the elastic element 204 releases its elastic potential energy and drives the fireproof pipe 4 to automatically return to its initial centering position through the conical guide, always ensuring that the force is transmitted axially along the fireproof pipe 4.

[0029] The axial length L of the positioning pin 2011 is 1.2-1.5 times the maximum horizontal displacement value S of the seismic isolation layer, and the depth of the positioning hole 401 is not less than the length L of the positioning pin 2011. When the horizontal displacement reaches the maximum design value S, at least 1 / 3 of the axial length of the root of the conical surface of the positioning pin 2011 is still in contact with the inner wall of the conical surface of the positioning hole 401 to ensure that the guiding effect of the conical surface is always effective and to prevent the positioning pin 2011 from completely coming out of the positioning hole 401.

[0030] On the end face of the buffer post 201 that abuts against the fireproof pipe 4, a flexible buffer pad 2012 is provided outside the positioning pin 2011. The flexible buffer pad 2012 has a ring structure. Specifically, the flexible buffer pad 2012 can be made of rubber or silicone to buffer direct impact between the end faces.

[0031] The outer sides of the fireproof pipe 4 and the fixed base 1 are coated with an elastic limiting layer 3. The elastic limiting layer 3 is made of expandable polystyrene bead foam material and covers both sides of the fireproof pipe 4 assembly, serving as a graded limiting and buffering effect during minor earthquakes. In this embodiment, the coating thickness of the elastic limiting layer 3 is 5mm-15mm.

[0032] Fireproof cloth 5 is provided on the outer side of the elastic limiting layer 3. The fireproof cloth 5 is laid along the entire length of the outer wall. The upper and lower ends of the fireproof cloth 5 are fixed to the bottom surface of the floor slab and the top surface of the outer wall, respectively. The fireproof cloth 5 is arranged in a wavy shape.

[0033] The fireproof cloth 5 is secured to the bottom surface of the first floor slab and the top surface of the exterior wall with metal strips at both ends. The strips are continuously arranged along the length of the exterior wall. The joints between the strips and the fireproof cloth and the concrete substrate are fully sealed with fireproof sealant. The metal strips are anchored to the concrete base of the floor slab and the exterior wall with expansion bolts. An expansion anchor point is set every 300mm for each strip. The fireproof sealant is a fireproof silicone sealant that is resistant to high and low temperatures and has elastic deformation ability. It can expand and contract with the slight slippage of the isolation layer to prevent cracking and smoke leakage at the joints. At the same time, it blocks the penetration channels of smoke and flame in the gaps, ensuring that there are no through gaps between the two ends of the fireproof cloth and the structural substrate.

[0034] It also includes several fireproof columns 6, which are ceramicized silicone rubber hollow tubes. The fireproof columns 6 are set in the concave bending section of the corrugated fireproof cloth 5. The lower end of the fireproof column 6 is fixed to the top surface of the exterior wall, and the upper end leaves a gap with the bottom surface of the floor slab. The fireproof column 6 is filled with fireproof rock wool powder, and its lower peripheral wall has multiple leakage holes 601 that communicate with the internal cavity.

[0035] In use, under non-earthquake conditions, the elastic force of the elastic element 204 pushes the buffer column 201 outward through the push plate 203, ensuring that the flexible buffer pad 2012 at the end of the buffer column 201 maintains elastic contact with the free end face of the fireproof pipe 4. There is no gap between the upper and lower rows of fireproof pipes 4, avoiding rigid collisions caused by wind vibration or minor disturbances. When an earthquake occurs, the exterior wall and floor slab undergo relative horizontal displacement, and the upper and lower fireproof pipes 4 are laterally misaligned with their respective fixed bases 1. The ends of the fireproof pipes 4 obliquely press against the buffer column 201, pushing the buffer column 201 back into the guide groove 202, further compressing the elastic element 204 to absorb impact energy. The positioning pin 2011 and the positioning hole 401 are interlocked, which can limit the fireproof pipe 4 from separating from the buffer column 201 and from significant deviation; at the same time, the flexible buffer pad 2012 effectively buffers the oblique impact of the end face, avoiding direct rigid collisions between hard components. As the displacement continues to increase, the elastic limiting layer 3 undergoes elastic compression, absorbing some of the displacement energy. The corrugated fireproof cloth 5 fully unfolds to accommodate the large deformation displacement of the seismic isolation layer. The fireproof column 6 sways synchronously with the outer wall, and the fireproof rock wool powder inside it scatters through the leakage hole 601, enhancing the fireproof and heat insulation effect. After the earthquake, the elastic force of the elastic element 204 pushes the buffer column 201 to reset, allowing the components to re-fit and align.

[0036] The gap H between the upper end of the fireproof column 6 and the bottom surface of the floor slab is 1.5-2.0 times the maximum vertical displacement value Δ of the seismic isolation layer, and is not less than 20mm and not more than 100mm. This gap value ensures that the fireproof column 6 does not rigidly collide with the bottom surface of the floor slab during seismic uplift displacement, and also ensures that the fireproof column 6 provides effective support for the concave bending section of the corrugated fireproof cloth 5, preventing the fireproof cloth 5 from becoming too loose and losing its fire-sealing function. Furthermore, both the fireproof pipe 4 and the fireproof column 6 are preferably made of ceramicized silicone rubber composite material. This composite material, by weight, comprises 100 parts of silicone rubber matrix and 30-60 parts of inorganic ceramicized fillers such as wollastonite and mica powder. At room temperature, this material possesses good flexibility, adapting to the normal expansion and contraction deformation of the vibration isolation layer. When exposed to open flame or when the temperature suddenly rises above 300℃, the silicone rubber matrix undergoes thermal decomposition, simultaneously bonding and sintering the inorganic fillers, forming a dense, continuous, and crack-free ceramicized hard shell layer in situ. This ceramicized hard shell layer effectively blocks the axial spread of flames and high-temperature smoke along the fireproof pipe 4, slowing down the heat conduction rate and acting as a significant heat insulation barrier. Furthermore, it maintains high mechanical strength at high temperatures, replacing the original flexible pipe wall to withstand external compression and lateral impact loads, preventing the fireproof pipe 4 from collapsing or rupturing in a fire, thus ensuring a continuous and stable fire-sealing effect.

[0037] Fireproof pipe 4 and fireproof column 6 are made of the same ceramicized silicone rubber matrix material, differing only in cross-sectional dimensions and internal structure: fireproof pipe 4 is a hollow tube with a larger inner diameter to accommodate the insertion of buffer column 201 and positioning pin 2011; fireproof column 6 is a hollow tube with a smaller diameter, filled with fireproof rock wool powder and dissipated through a discharge hole 601 on the lower peripheral wall. Both have the same base material and complementary functions, working together to form a multi-layered ceramicized protective barrier when exposed to fire, preventing the spread of flames and high-temperature smoke along the vibration isolation gaps.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A connection node structure between the outer wall of the seismic isolation layer and the floor slab, characterized in that: It includes a fixed base (1), which is arranged in two rows along the length of the outer wall. The two rows of fixed bases (1) are respectively anchored to the top surface of the outer wall and the bottom surface of the first floor slab. Several fireproof pipes (4) are arranged between the two rows of fixed bases (1). One end of the fireproof pipe (4) is connected to the fixed base (1), and the other end forms an elastic abutment structure with the fixed base (1) on the opposite side.

2. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 1, characterized in that: The fixed base (1) is also provided with an internal threaded hole (101), and the fixed connection end of the fireproof pipe (4) is provided with an external threaded connector (402), which is threadedly connected to the internal threaded hole (101).

3. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 1, characterized in that: The fixed base (1) forms an elastic contact structure with the end of the fireproof pipe (4) through the buffer mechanism (2); the buffer mechanism (2) includes a guide groove (202) opened on the fixed base (1), a push plate (203) is slidably installed in the guide groove (202), and an elastic element (204) is also provided in the guide groove (202). One end of the elastic element (204) abuts against the inner wall of the guide groove (202), and the other end abuts against the push plate (203). A buffer column (201) is fixed on the side of the push plate (203) away from the elastic element (204), and one end of the buffer column (201) passes through the fixed base (1) and abuts against the end of the fireproof pipe (4).

4. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 3, characterized in that: A positioning pin (2011) is fixedly installed at one end of the buffer column (201) facing the fireproof pipe (4). A matching positioning hole (401) is opened at the docking end of the fireproof pipe (4). The positioning pin (2011) and the positioning hole (401) are fitted with a gap.

5. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 4, characterized in that: On the end face of the buffer column (201) that abuts against the fireproof pipe (4), a flexible buffer pad (2012) is provided outside the positioning pin (2011). The flexible buffer pad (2012) has a ring structure.

6. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 3, characterized in that: The fixed base (1) has a through groove (205) that communicates with the guide slide (202), and the buffer column (201) is slidably connected in the through groove (205).

7. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 1, characterized in that: The fireproof pipe (4) and the fixed base (1) are coated with an elastic limiting layer (3).

8. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 7, characterized in that: Fireproof cloth (5) is provided on the outside of the elastic limiting layer (3). The fireproof cloth (5) is laid along the entire length of the outer wall. The upper and lower ends of the fireproof cloth (5) are fixed to the bottom surface of the floor slab and the top surface of the outer wall, respectively. The fireproof cloth (5) is set in a wave shape.

9. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 8, characterized in that: It also includes several fireproof columns (6), which are set in the concave bending section of the corrugated fireproof cloth (5). The lower end of the fireproof column (6) is fixed to the top surface of the exterior wall, and the upper end is left with a gap from the bottom surface of the floor slab.

10. The connection node structure between the outer wall of the seismic isolation layer and the floor slab according to claim 8, characterized in that: The fireproof column (6) is filled with fireproof rock wool powder, and its lower peripheral wall has multiple material leakage holes (601) that are interconnected with the internal cavity.

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