Construction method of a seismic isolation building suspension type elevator shaft

Abstract

This invention belongs to the field of elevator shaft construction technology for seismic isolation buildings, and specifically relates to a construction method for suspended elevator shafts in seismic isolation buildings. It solves the technical problems of existing construction methods, such as rough structures, poor precision and appearance, environmental pollution, and the inability to clean the formwork after a single use. The proposed method uses thin jacks to extend and support the square timber frame and bamboo plywood of the shaft base slab. After the base slab concrete reaches its design strength, the jacks are returned to lower the height, and the formwork is then removed. The formwork used in this construction method can be reused. This method is highly efficient, low-cost, time-saving, and labor-saving, ensuring the seismic isolation effect of the building.

Description

Technical Field

[0001] This invention relates to the field of construction technology for elevator shafts in seismic isolation buildings, and more particularly to a construction method for suspended elevator shafts in seismic isolation buildings. Background Technology

[0002] Seismic isolation buildings typically employ floor-to-floor seismic isolation, placing the seismic isolation bearings on the first basement level. When designing buildings with elevators, the reinforced concrete elevator shaft is suspended from the roof beam of the first basement level. A 200mm clearance is generally provided between the elevator shaft bottom slab and the foundation bottom slab, and a 500mm clearance is generally provided between the elevator shaft exterior wall and the foundation. This ensures that in the event of a rare earthquake, the elevator shaft will not collide with the building foundation or side walls, preventing structural damage. Patents CN115142643A and CN104963425A disclose a construction method for a suspended elevator shaft in a seismic isolation system: the elevator pit and elevator shaft side walls are filled with extruded polystyrene (XPS) boards, the lower part is filled with fine sand, and the XPS boards are separated from the lower part of the elevator shaft. After the superstructure is completed, all XPS boards and fine sand are removed. This construction method results in a rough structure with poor precision and appearance, environmental pollution, single-use formwork that is difficult to clean, and low construction efficiency. Summary of the Invention

[0003] To overcome the technical defects of existing construction methods for suspended elevator shafts in seismic isolation buildings, such as rough structures, poor precision and appearance, environmental pollution, and the fact that templates can only be used once and are difficult to clean, this invention provides a construction method for suspended elevator shafts in seismic isolation buildings.

[0004] This invention provides a construction method for a suspended elevator shaft in a seismically isolated building, comprising the following steps: Step S1: First, complete the construction of the foundation slab and side wall reinforced concrete structure, and ensure that the construction surface is flat; Step S2: Continue construction of the lower support pier, which includes frame columns. Install seismic isolation bearings on the top of the lower support pier. Step S3: Arrange thin jacks with locking valves evenly in a rectangular array on the foundation plate. The height of the thin jacks is 86mm and the adjustable height of the thin jacks is 120mm. The oil inlets of all thin jacks are connected to the oil distributor through the oil supply pipes, and the oil outlets of all thin jacks are connected to the oil collector through the oil return pipes. The oil distributor and the oil collector are connected to the oil pump with the oil storage tank through the main oil supply pipe and the main oil return pipe, respectively, so that the oil can be fed in and out in a unified manner. Step S4: The same row of thin jacks supports the same square timber keel. Multiple square timber keels are supported by bamboo plywood. The height of the square timber keel is 90mm and the thickness of the bamboo plywood is 120mm. The bamboo plywood is used as the bottom plate template of the elevator shaft, and the square timber keel is used as the support for the bamboo plywood. The width of each bamboo plywood does not exceed the outer wall of the elevator shaft. Step S5: Adjust the bamboo plywood to the design elevation by adjusting the thin jack; Step S6: Tie the reinforcing steel bars of the elevator shaft bottom slab and pour the bottom slab concrete; Step S7: Tie the outer wall reinforcement of the elevator shaft, the middle wall reinforcement of the elevator shaft, the upper support reinforcement, the frame beam reinforcement, and the beam and slab reinforcement at the zero and positive points, and set up the formwork; Step S8: Pour concrete for the outer wall of the elevator shaft, the middle wall of the elevator shaft, the upper support, the frame beam, and the beams and slabs at the zero and positive points; Step S9: Remove the formwork from the outer wall of the elevator shaft, the middle wall of the elevator shaft, the upper support, the frame beam, and the beams and slabs at the zero and positive points; Step S10: After the concrete of the elevator shaft sidewall and elevator shaft bottom plate reaches the design strength, a suspended elevator shaft is formed. Open the main return oil pipe of the oil supply pump, control all thin jacks to unload, and lower the height of the thin jacks. Step S11: Remove the square timber keel at the bottom plate of the elevator shaft and take it out from the vibration isolation trench between the elevator shaft and the foundation side wall; Step S12: Remove the bamboo plywood that serves as the formwork for the bottom slab of the elevator shaft, and take the bamboo plywood out in sections from the seismic isolation trench. Step S13: Finally, remove the thin jack from the bottom of the elevator shaft and take it out of the vibration isolation trench for reuse.

[0005] Compared with the prior art, the technical solution provided by this invention has the following technical effects: The method described in this invention uses thin jacks to extend and support the square timber keel and bamboo plywood as the template for the bottom plate of the well shaft. After the bottom plate concrete reaches the design strength, the jacks return oil to lower the height. The template can be reused, resulting in high construction efficiency, low cost, time and labor saving, and ensuring the effect of building seismic isolation. Attached Figure Description

[0006] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a plan view of the elevator location in the suspended elevator shaft of the seismic isolation building according to a certain embodiment of the present invention; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 BB section view; Figure 4 This is a schematic diagram of the arrangement of square timber keel and bamboo plywood at the bottom plate of the elevator shaft in a certain embodiment of the present invention; Figure 5 This is a connection control diagram of a thin jack supporting the square timber keel in a certain embodiment of the present invention. In the diagram: 1. Foundation slab; 2. Elevator shaft bottom slab; 3. Vibration isolation trench; 4. Elevator shaft outer wall; 5. Elevator shaft middle wall; 6. Lower support pier; 7. Vibration isolation bearing; 8. Upper support pier; 9. Thin jack; 10. Square timber keel; 11. Bamboo plywood; 12. Frame column; 13. Frame beam; 14. Secondary beam at zero level; 15. Branch return oil pipe; 16. Branch supply oil pipe; 17. Main return oil pipe; 18. Main supply oil pipe; 19. Oil storage tank; 20. Oil supply pump; 21. Oil collector; 22. Oil distributor. Detailed Implementation

[0009] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0010] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0011] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0012] The following is in conjunction with the appendix Figures 1 to 5 Specific embodiments of the present invention will be described in detail below.

[0013] In one embodiment, such as Figure 1 As shown, a construction method for a suspended elevator shaft in a seismically isolated building is disclosed, including the following steps: Step S1: First, complete the construction of the foundation slab 1 and the reinforced concrete structure of the side walls, and ensure that the construction surface is flat; Step S2: Continue construction of the lower support pier 6, which includes frame columns 12. Install seismic isolation bearings on the top of the lower support pier 6. Step S3: Arrange thin jacks 9 with locking valves evenly in a rectangular array on the foundation plate 1. The height of the thin jacks 9 is 86mm and the adjustment height of the thin jacks 9 is 120mm. The oil inlets of all thin jacks 9 are collected to the oil distributor 22 through the oil supply pipe 16, and the oil outlets of all thin jacks 9 are collected to the oil collector 21 through the oil return pipe 15. The oil distributor 22 and the oil collector 21 are connected to the oil pump 20 with oil storage tank 19 through the main oil supply pipe 18 and the main oil return pipe 17, respectively, so that oil can be fed in and out in a unified manner. Step S4: The same row of thin jacks 9 supports the same square timber keel 10. Multiple square timber keels 10 are supported by bamboo plywood 11. The height of the square timber keel 10 is 90mm and the thickness of the bamboo plywood 11 is 120mm. The bamboo plywood 11 serves as the template for the bottom plate of the elevator shaft, and the square timber keel 10 serves as the support for the bamboo plywood 11. The width of each piece of bamboo plywood 11 does not exceed the outer wall 4 of the elevator shaft. Step S5: Adjust the bamboo plywood 11 to the design elevation by adjusting the thin jack 9; Step S6: Tie the reinforcing bars of the elevator shaft bottom slab 2 and pour the bottom slab concrete; Step S7: Tie the 4 steel bars of the outer wall of the elevator shaft, the 5 steel bars of the middle wall of the elevator shaft, the 8 steel bars of the upper support, the 13 steel bars of the frame beam, and the beam and slab steel bars at the zero and positive points, and set up the formwork. Step S8: Pour concrete for the elevator shaft outer wall 4, elevator shaft middle wall 5, upper support 8, frame beam 13, and beams and slabs at the zero and positive points; Step S9: Remove the formwork of elevator shaft outer wall 4, elevator shaft middle wall 5, upper support 8, frame beam 13, and beams and slabs at the zero and positive points; Step S10: When the concrete of the elevator shaft sidewall and elevator shaft bottom plate 2 reaches the design strength, a suspended elevator shaft is formed. Open the main return oil pipe 17 of the oil supply pump 20, control all thin jacks 9 to unload, and lower the height of the thin jacks 9. Step S11: Remove the square timber keel 10 at the bottom plate of the elevator shaft and take it out from the vibration isolation trench 3 between the elevator shaft and the foundation side wall; Step S12: Remove the bamboo plywood 11 that serves as the template for the bottom slab of the elevator shaft, and take the bamboo plywood 11 out in sections from the seismic isolation trench 3. Step S13: Finally, remove the thin jack 9 from the bottom of the elevator shaft and take it out of the vibration isolation trench 3, ready for reuse.

[0014] Specifically, the clear distance between the outer wall of the elevator shaft 4 and the side wall of the foundation is less than 400mm. The formwork of the outer wall of the elevator shaft can be supported by jacks on the side wall of the foundation in the same way as the formwork of the base plate, with steel reinforcement supports in the middle to support the weight of the jacks.

[0015] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A construction method for a suspended elevator shaft in a seismic isolation building, characterized in that, Includes the following steps: Step S1: First, complete the construction of the foundation slab (1) and the reinforced concrete structure of the side walls, and ensure that the construction surface is flat; Step S2: Continue construction of the lower support pier (6), which includes frame columns (12). Install seismic isolation bearings on the top of the lower support pier (6). Step S3: Arrange thin jacks (9) with locking valves evenly in a rectangular array on the base plate (1). The height of the thin jacks (9) is 86mm and the adjustment height of the thin jacks (9) is 120mm. The oil inlets of all the thin jacks (9) are connected to the oil distributor (22) through the oil supply pipe (16) and the oil outlets of all the thin jacks (9) are connected to the oil collector (21) through the oil return pipe (15). The oil distributor (22) and the oil collector (21) are connected to the oil pump (20) with the oil storage tank (19) through the main oil supply pipe (18) and the main oil return pipe (17) respectively, so that the oil can be fed in and out in a unified manner. Step S4: The same row of thin jacks (9) supports the same square timber keel (10). Multiple square timber keels (10) are supported by bamboo plywood (11). The height of the square timber keel (10) is 90mm and the thickness of the bamboo plywood (11) is 120mm. The bamboo plywood (11) serves as the template for the bottom plate of the elevator shaft, and the square timber keel (10) serves as the support for the bamboo plywood (11). The width of each bamboo plywood (11) does not exceed the outer wall (4) of the elevator shaft. Step S5: Adjust the bamboo plywood (11) to the design elevation by adjusting the thin jack (9); Step S6: Tie the reinforcing bars of the elevator shaft bottom slab (2) and pour the bottom slab concrete; Step S7: Tie the steel bars of the outer wall (4) of the elevator shaft, the steel bars of the middle wall (5) of the elevator shaft, the steel bars of the upper support (8), the steel bars of the frame beam (13), and the steel bars of the beams and slabs at the zero and positive points, and set up the formwork; Step S8: Pour concrete for the outer wall (4), middle wall (5), upper support (8), frame beam (13), and beams and slabs at the zero and positive points of the elevator shaft; Step S9: Remove the formwork of the elevator shaft outer wall (4), elevator shaft middle wall (5), upper support (8), frame beam (13) and beams and slabs at the zero and positive points; Step S10: When the concrete of the elevator shaft sidewall and elevator shaft bottom plate (2) reaches the design strength, a suspended elevator shaft is formed. Open the main return oil pipe (17) of the oil supply pump (20), control all thin jacks (9) to unload, and lower the height of the thin jacks (9). Step S11: Remove the square timber keel (10) at the bottom plate of the elevator shaft and take it out from the vibration isolation trench (3) between the elevator shaft and the foundation side wall; Step S12: Remove the bamboo plywood (11) that serves as the template for the bottom plate of the elevator shaft, and take the bamboo plywood (11) out of the vibration isolation trench (3) in pieces; Step S13: Finally, remove the thin jack (9) from the bottom of the elevator shaft and take it out from the vibration isolation trench (3) for reuse.

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