Isolation support lower pier structure, isolation joint and construction method

Abstract

The application relates to a lower supporting pier structure of an isolation support, an isolation joint and a construction method, which comprises a concrete base and a supporting pier, the supporting pier comprises a module panel, the bottom end of the module panel is fixed with embedded parts of the concrete base, a concrete structure is arranged in the internal cavity of the module panel, a multilayered tensile reinforcement net is arranged in the internal cavity of the concrete structure, the tensile reinforcement net is fixed with the inner side of the module panel, and a plurality of vertical dowels are arranged in the internal cavity of the concrete structure of the supporting pier and extend into the internal cavity of the concrete structure, the lower supporting pier structure is high in bearing capacity, convenient in construction and high in positioning precision of the isolation support.

Description

Technical Field

[0001] This invention relates to the field of building technology, specifically to a seismic isolation bearing underpinning structure, seismic isolation node, and construction method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The substructure piers of the seismic isolation layer support the entire superstructure and are critical load-bearing components. They must meet the bearing capacity design requirements under rare earthquakes, and the stress on these components is complex yet extremely important. Therefore, the reinforcement ratio of the substructure piers is significantly higher than that of seismic-resistant structures, with dense reinforcement at the joints. Traditional seismic isolation structures use on-site reinforcement binding for the substructure piers. The dense reinforcement often obstructs the reinforcement binding and concrete pouring by interfering with pre-embedded bolts, anchor bars, and structural steel. In recent years, with the development of prefabricated construction technology, seismic isolation technicians have studied prefabricated seismic isolation joints. Prefabricated seismic isolation joints involve prefabricating components in a factory and then transporting them to the construction site for hoisting and assembly. This simplifies the construction process, increases installation accuracy, and ultimately improves construction efficiency and quality.

[0004] For example, patent CN113235741A discloses a prefabricated steel-concrete composite seismic isolation joint and its construction method. The inventors found that this patent application proposes using prefabricated steel-concrete composite lower supports for prefabricated installation, with the lower supports anchored to the foundation slab via pre-embedded anchor bolts. Anchor bolts are generally unsuitable for bottom shear resistance; when shear force is large, shear keys must be installed. However, the lower supports need to withstand rare earthquakes with very large shear forces. Therefore, this patent fails to solve the problem of the joint's shear bearing capacity. Furthermore, this patent application still uses existing on-site positioning for the installation of the seismic isolation supports, resulting in poor positioning accuracy. The prefabricated lower supports are heavy, making hoisting on-site difficult and hindering project implementation. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seismic isolation bearing underpinning pier structure with strong bearing capacity, high positioning accuracy of the seismic isolation bearing, and convenient engineering implementation.

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

[0007] In a first aspect, embodiments of the present invention provide a seismic isolation bearing pier structure, including a concrete base and a pier. The pier includes a modular panel, the bottom end of which is fixed to an embedded part of the concrete base. A concrete structure is provided inside the cavity of the modular panel, and a multi-layer reinforcing mesh is provided inside the concrete structure. The reinforcing mesh is fixed to the inner side of the modular panel. A plurality of vertical reinforcing bars extending into the concrete structure of the pier are provided inside the concrete base.

[0008] Optionally, the embedded component includes an embedded plate, the upper surface of which is flush with the upper surface of the concrete base plate, and the upper surface of the embedded plate is fixed to the bottom end of the module panel.

[0009] Optionally, the lower surface of the embedded plate is provided with multiple fixing bars embedded in the concrete base.

[0010] Optionally, the top of the inner side of the module panel is provided with multiple brackets, which are fixed to the positioning plate to support the positioning plate. The positioning plate is provided with multiple connecting steel bars for fixing to the seismic isolation support.

[0011] Optionally, multiple connecting reinforcing bars are distributed at equal intervals along the circumference, and the positions of the connecting reinforcing bars avoid the positions of the tie bars in the tie mesh.

[0012] Optionally, the bracing mesh is a mesh structure composed of multiple vertically intersecting first and second bracing bars, with both ends of the first bracing bars fixed to the inner side of the module panel and both ends of the second bracing bars fixed to the inner side of the module panel.

[0013] Optionally, the position of the vertical insert corresponds to the position of the mesh formed between the first tie rod and the second tie rod.

[0014] Secondly, embodiments of the present invention provide a seismic isolation node, which is provided with the seismic isolation bearing lower support structure described in the first aspect.

[0015] Thirdly, embodiments of the present invention provide a construction method for the seismic isolation bearing under-pier structure described in the first aspect, comprising the following steps:

[0016] The concrete base is poured and cured to the set strength; when pouring the concrete base, embedded parts and multiple vertical tie bars are embedded within the area where the supports are set.

[0017] The pre-fixed reinforcing mesh module panel is fixed to the concrete base using embedded parts;

[0018] After the module panel is fixed, the concrete structure inside the module panel is poured and cured to the set strength.

[0019] Optionally, before fixing the module panel to the embedded parts, the area within which the concrete base supports are set should be roughened.

[0020] The beneficial effects of this invention are:

[0021] 1. The seismic isolation bearing lower support structure of the present invention solves the problem of insufficient bearing capacity of existing lower support structures. The concrete base is provided with multiple vertical reinforcing bars extending into the concrete of the support, and the support is provided with multiple layers of tie mesh. The vertical reinforcing bars and tie mesh are used to bear the shear force. Compared with the traditional support and base fixed by anchor bolts, it has strong shear resistance, bending resistance and axial bearing capacity. Moreover, it solves the problem of local pressure at the bottom of the support and realizes the bearing capacity design requirements of the bottom layout of the support. The module panel is fixed to the embedded parts of the concrete base, which solves the bending resistance and axial force problem of the lower support and realizes the bending resistance and axial bearing capacity design requirements of the lower support.

[0022] 2. The seismic isolation bearing lower support structure and construction method of the present invention are both cast-in-place concrete base and concrete structure inside the support. Compared with traditional hoisting, there are no requirements on the size and weight of the concrete base and support, and a larger lower support structure can be prepared, which is convenient for construction.

[0023] 3. The seismic isolation bearing lower support structure and construction method of the present invention, after the module panel is installed, the top surface of the base plate is roughened and then the internal concrete structure is poured, which can enhance the bonding strength between the support and the top surface of the concrete base and improve the overall integrity of the entire lower support structure.

[0024] 4. The seismic isolation bearing underpinning structure and construction method of the present invention pre-fixes the corbel and positioning plate on the top of the module panel, and positions the seismic isolation bearing in the processing plant. The seismic isolation bearing can be directly installed on the construction site without the need for on-site positioning measures, thus ensuring the installation accuracy of the seismic isolation bearing. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the concrete structure before pouring in Embodiment 1 of the present invention;

[0028] Figure 3 For the present invention Figure 2 A schematic diagram of the section along direction A;

[0029] Figure 4 For the present invention Figure 2 Schematic diagram of section B in the middle;

[0030] Figure 5 This is a schematic diagram of the seismic isolation bearing lower support structure and the seismic isolation bearing assembly in Embodiment 2 of the present invention;

[0031] Figure 6 This is a schematic diagram of the concrete base structure poured in step 1 of embodiment 3 of the present invention;

[0032] Among them, 1. Concrete base, 2. Embedded parts, 3. Vertical reinforcing bars, 4. Module panel, 5. Tie mesh, 6. Corbel, 7. Positioning plate, 8. Connecting reinforcing bars, 9. Seismic isolation bearing, 10. Concrete structure. Detailed Implementation

[0033] Example 1

[0034] This embodiment provides a seismic isolation bearing under pier structure, such as Figures 1-4 As shown, it includes a concrete base 1, embedded parts 2, supports, etc., specifically:

[0035] The concrete base 1 adopts a cubic structure and is made of cast concrete, serving as the load-bearing component of the support pier.

[0036] The support includes a modular panel 4, and the internal space of the modular panel 4 is filled with a concrete structure 10. In this embodiment, the modular panel 4 adopts a cylindrical structure with open ends and a square horizontal cross section. It is composed of four templates made of steel. The four templates are welded and fixed in sequence to form a cylindrical structure with open ends.

[0037] The module panel 4 is used as a casting template for its internal concrete structure 10.

[0038] The concrete base 1 is equipped with an embedded part 2, which is fixed to the template, thereby fixing the module panel 4 to the concrete base 1.

[0039] In this embodiment, the embedded part 2 includes an embedded plate. Since four templates are set, four embedded plates are also set, with each embedded plate corresponding to one template.

[0040] The bottom of the template is welded and fixed to the embedded plate, and the top surface of the embedded plate is flush with the top surface of the concrete base, so that the bottom surface of the template can be welded and fixed to the top surface of the embedded plate.

[0041] To further increase the connection strength between the embedded plate and the concrete base, multiple reinforcing bars are welded and fixed to the bottom surface of the embedded plate. The reinforcing bars are set perpendicular to the embedded plate and embedded in the concrete base 1, thereby achieving anchorage with the concrete base 1 and strengthening the connection strength between the embedded plate and the concrete base 1.

[0042] In this embodiment, the welding strength of the four templates and the embedded plate is the same, which solves the problem of bending resistance and axial force of the lower support structure and meets the design requirements of bending resistance and axial bearing capacity of the lower support structure.

[0043] In this embodiment, the lower support pier is designed to bear the bending moment and axial force transmitted by the superstructure during an earthquake, and is considered as a compression-bending member.

[0044] A concrete structure 10 is poured into the cavity enclosed by the four templates. Multiple layers of reinforcing mesh 5 are vertically arranged inside the concrete structure 10, and the reinforcing mesh 5 is fixed to the inner surface of the templates. The multiple layers of reinforcing mesh 5 are arranged at equal intervals vertically.

[0045] In this embodiment, the bracing mesh 5 adopts a mesh structure formed by multiple first bracing bars and second bracing bars that are perpendicularly intersected and fixed. The two ends of the first bracing bars are welded and fixed to the inner sides of two oppositely arranged templates, and the two ends of the second bracing bars are welded and fixed to the inner sides of two other oppositely arranged templates. The welding strength of the multiple bracing bars to the inner sides of the templates is the same.

[0046] By installing a reinforcing mesh 5 inside the concrete structure of the pier, the problem of local pressure at the bottom of the support was solved, and the design requirements for local pressure bearing capacity at the bottom of the support were met.

[0047] Specifically:

[0048] F l ≤0.9(β c β l f c +2αρ v β cor f yv A ln

[0049]

[0050] Where F l For the local pressure at the bottom of the support, n1, A s1 These represent the number of the first tie bars and the cross-sectional area of ​​a single rebar, respectively, n2 and A. s2 These represent the number of the first tie bars and the cross-sectional area of ​​a single rebar, respectively. The remaining parameters in the formula are existing set values ​​and will not be explained in detail here. Therefore, it can be seen from the above formula that by setting the first tie bars and the second tie bars, the local bearing capacity at the bottom of the support can be improved, thus meeting the design requirements for the local bearing capacity of the lower part of the support.

[0051] The support is located in the center of the upper surface of the concrete base 1. Multiple vertical reinforcing bars 3 are embedded in the concrete base corresponding to the center area. The top of the vertical reinforcing bars 3 extends above the concrete base 1 and into the concrete structure 10 of the support. In this embodiment, the number and position of the vertical reinforcing bars 3 match the number and position of the mesh formed by the first and second reinforcing bars. Each mesh corresponds to one vertical reinforcing bar 3, so that the vertical reinforcing bars 3 can pass through the mesh and the reinforcing bar mesh 5. The top of the vertical reinforcing bars 3 extends above the second layer of reinforcing bar mesh 5 from below. It is understood that those skilled in the art can set the length of the vertical reinforcing bars according to actual needs.

[0052] In this embodiment, before pouring the concrete structure of the pier, the upper surface of the central area of ​​the concrete base 1 where the pier is located is roughened. Therefore, the lower pier structure is designed as a frame column. During the design, the shear contribution of the concrete is not considered, and only the vertical reinforcing bars 3 play a shear resistance role, which must meet the following conditions:

[0053] As = V / fy

[0054] Where As is the cross-sectional area of ​​the required vertical reinforcing bars;

[0055] V represents the shear force borne by the lower support pier under seismic action;

[0056] fy represents the shear strength of the steel reinforcement.

[0057] In this embodiment, the lower support structure solves the horizontal shear resistance problem by setting vertical tie bars 3 and tie mesh 5 and roughening the surface of the concrete base 1, thus meeting the shear bearing capacity requirements of the lower support structure. Compared with the traditional method of connecting the support and the base with anchor bolts, it has stronger horizontal shear resistance and can withstand rare earthquakes.

[0058] In order to accurately position the installation location of the seismic isolation bearing 9, a bracket 6 is provided on the top of the inner side of the module panel 4. Each template has a bracket 6 on the top of its inner side, so there are four brackets 6 on the inner side of the module panel. The upper surface of the bracket 6 is flush with the upper surface of the concrete structure 10.

[0059] A positioning plate 7 is fixed on the upper surface of the bracket 6. The positioning plate 7 is a circular plate and is coaxially arranged with the support. In this embodiment, the positioning plate 7 and the bracket 6 are connected by bolts or fixed by welding.

[0060] The positioning plate 7 is a circular plate, which creates a space between the outer edge of the positioning plate 7 and the inner side of the module panel, facilitating the pouring of concrete structures.

[0061] The positioning plate 7 is fixed with a plurality of connecting steel bars 8 along the circumference. The connecting steel bars 8 pass vertically through the positioning plate 7 and their bottom ends extend into the concrete structure 10.

[0062] In this embodiment, multiple connecting steel bars 8 are arranged at equal intervals along the circumference, and the positions of the connecting steel bars 8 avoid the positions of the first tie bar and the second tie bar, so that the connecting steel bars 8 can pass through the mesh of the tie bar mesh 5 and extend into the concrete structure 10, ensuring that the connecting steel bars 8 have sufficient anchorage length, thereby ensuring the fixing firmness of the seismic isolation support.

[0063] The corbel 6, positioning plate 7, and connecting steel bars 8 are all pre-welded and fixed in the factory, which can ensure their positional accuracy. Compared with the existing method of locating the installation position of the seismic isolation bearing on the construction site, its positioning accuracy is higher, ensuring the installation accuracy of the seismic isolation bearing.

[0064] Example 2

[0065] This embodiment provides a seismic isolation node, such as Figure 5 As shown, the structure includes the seismic isolation bearing lower support structure described in Embodiment 1. The seismic isolation bearing lower support structure is provided with a seismic isolation bearing on the upper surface of the positioning plate. The seismic isolation bearing is welded and fixed to the connecting steel bars. Other structures of the node can adopt existing structures, and their specific structures will not be described in detail here.

[0066] Example 3

[0067] This embodiment provides a construction method for the seismic isolation bearing under-pier structure described in Embodiment 1, including the following steps:

[0068] Step 1: As Figure 6 As shown, a pouring template for the concrete base 1 is erected, concrete is poured into the concrete base 1, and cured to the set strength. During pouring, a pre-embedded plate and its reinforcing bars welded to its bottom surface are embedded in the concrete base 1, and multiple vertical reinforcing bars 3 are embedded at designated positions within the concrete base 1. After the concrete base 1 has cured to the set strength, the central area of ​​the upper surface where the support pier is installed is roughened.

[0069] Step 2: Hoist the module panel 4, which has been welded with the reinforcing mesh 5, corbel 6, positioning plate 7 and connecting steel bars 8, into place, and weld the four templates of the module panel 4 to the four embedded plates with equal strength.

[0070] The supports are prefabricated in the factory. The modular panels 4, tie mesh 5, corbels 6, positioning plates 7 and connecting steel bars 8 are welded in the factory and can be directly hoisted after being transported to the construction site.

[0071] Step 3: Pour concrete into the internal cavity of module panel 4 until the top surface of the concrete is flush with the top surface of corbel 6, forming concrete structure 10 and curing it to the set strength, thus completing the construction of the seismic isolation bearing under support structure.

[0072] After the construction of the lower support structure of the seismic isolation bearing is completed, the seismic isolation bearing 9 is hoisted, and the connecting steel bar 8 is passed through the installation hole at the bottom of the seismic isolation bearing 9 and then welded and fixed to the seismic isolation bearing 9.

[0073] In the construction method of this embodiment, only the module panel 4 and the connected tie mesh 5, corbel 6, positioning plate 7, connecting steel bars 8, etc., need to be hoisted as a whole. It is lightweight and easy to hoist. Compared with the traditional hoisting of the poured concrete support, the transfer and hoisting is simple and safe, which reduces the construction difficulty and can greatly improve the construction efficiency.

[0074] Furthermore, the concrete structure inside the pier is cast in post-concrete form, which effectively enhances the bond between the concrete structure inside the pier and the concrete base, thereby improving the overall integrity of the entire lower pier structure.

[0075] The construction accuracy can be monitored throughout the installation of the supports and the pouring of the concrete structure, and adjustments can be made flexibly.

[0076] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this 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 without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A seismic isolation bearing under-pier structure, characterized in that, The system includes a concrete base and a support. The support includes a modular panel, the bottom of which is fixed to an embedded part of the concrete base. A concrete structure is located within the internal cavity of the modular panel, and multiple layers of reinforcing mesh are installed inside the concrete structure. The reinforcing mesh is fixed to the inner side of the modular panel. Multiple vertical reinforcing bars extending into the concrete structure of the support are installed within the concrete base. The embedded part includes an embedded plate, the upper surface of which is flush with the upper surface of the concrete base and fixed to the bottom of the modular panel. Multiple fixing bars embedded in the concrete base are located on the lower surface of the embedded plate. The reinforcing mesh is a mesh structure composed of multiple vertically intersecting first and second reinforcing bars. Both ends of the first and second reinforcing bars are fixed to the inner side of the modular panel. Multiple brackets are installed at the top of the inner side of the modular panel, fixed to a positioning plate for support. The positioning plate has multiple connecting reinforcing bars for fixing to the seismic isolation bearing. These connecting reinforcing bars are evenly spaced along the circumference, and their positions avoid the positions of the reinforcing mesh.

2. The seismic isolation bearing under-pier structure as described in claim 1, characterized in that, The position of the vertical reinforcing bar corresponds to the position of the mesh formed between the first and second reinforcing bars.

3. A seismic isolation node, characterized in that, The structure includes a seismic isolation bearing under pier as described in any one of claims 1-2.

4. A construction method for a seismic isolation bearing under-pier structure according to any one of claims 1-2, characterized in that, Includes the following steps: The concrete base is poured and cured to the set strength; when pouring the concrete base, embedded parts and multiple vertical reinforcing bars are embedded within the area where the supports are set. The pre-fixed reinforcing mesh module panel is fixed to the concrete base using embedded parts; After the module panel is fixed, the concrete structure inside the module panel is poured and cured to the set strength.

5. The construction method of the seismic isolation bearing under-pier structure as described in claim 4, characterized in that, Before fixing the module panel to the embedded parts, roughen the area within which the concrete base supports are set.

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