Construction elevator foundation for backfill area of basement roof

Abstract

The utility model belongs to the field of building construction technology, specifically discloses a construction elevator foundation for the backfill area of basement roof, which comprises a plurality of vertical support components fixed on the basement roof, a foundation beam erected on the top of the vertical support components and connecting the plurality of vertical support components into a whole frame, and a foundation plate arranged in the top space of the whole frame, wherein the structure system formed by the vertical support components, the foundation beam and the foundation plate spans the backfill soil area in an overhead manner, the construction elevator load is directly transmitted to the stable basement roof through the path of the foundation plate, the foundation beam and the vertical support components, thereby avoiding the influence of the backfill soil settlement. The utility model is stable in structure, safe and reliable, and is especially suitable for engineering projects with thick backfill soil above the basement roof.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to a construction elevator foundation for high-rise building construction. Background Technology

[0002] With the acceleration of urbanization, high-rise and super high-rise buildings are increasing, often equipped with large-scale underground parking garages. During the construction of these buildings, construction elevators are indispensable key equipment for the vertical transportation of materials and personnel. The foundations of construction elevators are usually located on the outside of the main structure, often precisely in the backfill area above the underground parking garage roof.

[0003] However, setting up construction elevator foundations in such areas presents significant technical challenges:

[0004] The most common approach is to directly construct foundations on the backfill soil, either as isolated concrete foundations or strip foundations. However, this method has a major drawback: the backfill soil is artificially compacted, and its density and bearing capacity are unlikely to reach the stable levels of undisturbed soil. Furthermore, under long-term loads and rainwater erosion, uneven settlement is highly likely to occur. This uneven settlement can directly cause the construction elevator guide rails to tilt and deform, severely affecting the safe operation of the elevator and posing a significant safety hazard.

[0005] Another option for constructing a heavy raft foundation on the basement roof slab is to pour a massive, extremely thick reinforced concrete raft foundation onto the basement roof slab to avoid backfill settlement issues. While this option provides a stable platform, it also has significant drawbacks: First, the extremely thick raft foundation has a tremendous self-weight, placing a huge permanent load on the basement roof structure below, potentially exceeding the slab's design bearing capacity and jeopardizing the basement's structural safety. Second, this option requires a massive amount of concrete and steel, leading to a sharp increase in construction costs and failing to meet the requirements of economic efficiency and green construction.

[0006] Furthermore, regardless of which of the above methods is adopted, the construction process may damage the original waterproof layer of the basement roof slab, leaving potential water leakage hazards and affecting the long-term quality of the building. Summary of the Invention

[0007] Purpose of the invention: The purpose of this utility model is to address the shortcomings of the existing technology by providing a construction elevator foundation for the backfill area of ​​the basement roof, in order to solve the problems existing in the background technology, such as foundation instability caused by uneven settlement of backfill soil, excessive load on the basement roof due to the use of thick raft slabs, excessive cost, and easy damage to the waterproof layer.

[0008] Technical Solution: The construction elevator foundation for the backfill area of ​​the basement roof slab according to this utility model includes: a plurality of vertical support members, the bottom of which is fixed to the basement roof slab; a foundation beam, which is erected on top of the plurality of vertical support members and connects the plurality of vertical support members into an integral frame; and a foundation slab, which is set in the top space of the integral frame; wherein, the vertical support members, the foundation beam, and the foundation slab together constitute a load-bearing structural system, which spans the backfill area between the basement roof slab and the foundation slab in an elevated manner, and ultimately transfers the load of the construction elevator to the basement roof slab via the foundation slab, the foundation beam, and the vertical support members.

[0009] By adopting the above technical solution, this utility model directly transfers the load of the construction elevator to the solid and reliable basement roof through an independent, elevated "column-beam-slab" frame structure, completely bypassing the unstable and unreliable backfill soil layer, and fundamentally solving the problem of uneven settlement.

[0010] To further improve the above technical solution, the number of the plurality of vertical support components is five, of which: four are arranged along the four corners of the foundation plate, and the other is arranged directly below the construction elevator.

[0011] Furthermore, the vertical support member is a vertical column pier of reinforced concrete structure.

[0012] Furthermore, the vertical column pier is provided with vertical column pier main reinforcement and vertical column pier stirrups; the bottom of the vertical column pier main reinforcement is pre-embedded in the basement roof slab, and the embedding length is not less than the anchorage length La, while the top of the vertical column pier main reinforcement is anchored in the foundation beam.

[0013] Furthermore, the main reinforcement of the vertical column pier is HRB4008Φ18, and the stirrups of the vertical column pier are HRB400Φ10@150.

[0014] Furthermore, a waterproof layer is provided on the top slab of the basement, which is turned up along the side of the vertical column and connected to it to form a continuous and seamless overall waterproof barrier.

[0015] Furthermore, the vertical column pier has a cross-sectional side length of 0.3m to 0.6m; the foundation beam is a reinforced concrete structure with a cross-sectional side length of 0.3m to 0.6m.

[0016] Furthermore, a total of 5 foundation beams are provided, and both ends of the foundation beams are fixed to the top of the vertical column pier or inside the beam of the vertical column pier.

[0017] Furthermore, the foundation beam is provided with main reinforcement bars and stirrups. The top and bottom reinforcement bars of the foundation beam are both HRB4002Φ18, and the stirrups of the foundation beam are HRB400Φ8@150.

[0018] Furthermore, the foundation slab is a reinforced concrete slab with a thickness of 0.3m to 0.5m; the foundation slab is equipped with double-layered, bidirectional main reinforcement bars with a specification of HRB400φ14@150, and the main reinforcement bars are anchored within the foundation beam.

[0019] Beneficial Effects: Compared with existing technologies, the advantages of this utility model are as follows: The load transfer path of this utility model is clear, acting directly on the stable basement roof slab, completely avoiding the safety risks to construction elevator operation caused by uneven settlement of backfill soil. The structure is stable and reliable. Compared with solid thick raft foundations of the same load-bearing capacity, the elevated frame structure of this utility model is a "hollowed-out" structure, significantly reducing its self-weight and greatly alleviating the additional load on the basement roof slab, ensuring the structural safety of the basement. At the same time, it significantly saves on the amount of concrete and steel used, resulting in significant economic benefits. By using a process of turning the waterproof layer up along the side of the vertical support members, a continuous and seamless overall waterproof system can be formed, effectively protecting the original waterproof layer of the basement roof slab from damage and avoiding the risk of later leakage.

[0020] The construction technology of this utility model is mature, easy to implement and promote, and is especially suitable for situations where the backfill soil is thick. Attached Figure Description

[0021] Figure 1 This is a plan view of the construction elevator foundation for the backfill area of ​​the basement roof provided by this utility model.

[0022] Figure 2 for Figure 1 A cross-sectional view along line 1-1.

[0023] Figure 3 for Figure 1 A cross-sectional view along line 2-2.

[0024] In the diagram: 1-Vertical column pier, 11-Main reinforcement of vertical column pier, 12-Stirrups of vertical column pier; 2-Foundation beam, 21-Main reinforcement of foundation beam, 22-Stirrups of foundation beam; 3-Foundation slab, 31-Main reinforcement of foundation slab; 4-Basement roof slab, 41-Main reinforcement of basement roof slab; 5-Backfill soil. Detailed Implementation

[0025] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0026] Example 1: As shown in the attached document Figures 1 to 3The construction elevator foundation shown is used for the backfilling area of ​​the basement roof slab. It is mainly composed of multiple vertical support components, foundation beam 2, and foundation slab 3, and sits on the basement roof slab 4.

[0027] In this preferred embodiment, the vertical support members are in the form of reinforced concrete vertical column piers 1. In the layout of this embodiment, a total of five vertical column piers 1 and five foundation beams 2 are provided, wherein: four vertical column piers 1 are arranged along the four corners of the foundation slab 3, and the other vertical column pier 1 is arranged directly below the construction elevator. The two ends of the five foundation beams 2 are fixed to the top of the vertical column piers 1 or inside the beams of the vertical column piers 1, so as to most effectively support the concentrated load from the elevator.

[0028] To ensure a firm and reliable connection between the vertical column pier 1 and the basement roof slab 4, the lower part of the main reinforcement bar 11 of the vertical column pier is pre-embedded at the designed location during the pouring of the basement roof slab 4. The length of the main reinforcement bar 11 embedded in the basement roof slab 4 is not less than the anchorage length La of the reinforcement bar. The upper end of the main reinforcement bar 11 must be anchored into the foundation beam 2 to meet the specifications. The cross-sectional dimensions of the vertical column pier 1 can be determined based on load calculations; for example, a 0.4m × 0.4m cross-section can be used. The main reinforcement bar 11 of the vertical column pier is HRB400 8Φ18, and the stirrups 12 of the vertical column pier are HRB400Φ10@150.

[0029] After the basement roof slab 4 has been cured, the waterproof layer can be applied on top. Around the vertical column pier 1, the horizontally laid waterproof membrane is flipped up along the side of the vertical column pier 1 and reliably adhered to form a continuous, seamless overall waterproof barrier, thereby ensuring that the newly added column pier structure will not damage the overall waterproof performance of the basement roof slab.

[0030] Backfilling is carried out in the area between and around the vertical column piers 1, up to the designed bottom elevation of the foundation slab 3. The backfill soil 5 serves only as filler. At the top of the vertical column piers 1, foundation beam 2 is poured, connecting all the vertical column piers 1 into a stable overall frame. In this embodiment, the cross-sectional dimensions of foundation beam 2 are 0.4m × 0.4m, and it is internally equipped with main reinforcement 21 and stirrups 22. To ensure the integrity of the structure, the top and bottom reinforcements of the main reinforcement 21 are both HRB400 2Φ18, and the stirrups 22 are HRB400 Φ8@15.

[0031] A foundation slab 3 is poured on top of the foundation beam 2, providing a flat and solid installation platform for the construction elevator. In this embodiment, the foundation slab 3 is 6.5m long, 4.0m wide, and 0.4m thick, and is equipped with double-layered, bidirectional main reinforcement bars 31, with a specification of HRB400φ14@150. To ensure effective load transfer, the ends of the main reinforcement bars 31 must be anchored within the foundation beam 2.

[0032] The working principle and load transfer path of this utility model are as follows: The construction elevator and its operating load first act on the foundation slab 3. The foundation slab 3 transfers the surface load to the foundation beam 2 below. The foundation beam 2 collects the line load and then transfers it to the vertical column pier 1. Finally, the vertical column pier 1 safely transfers all concentrated loads to the high-bearing-capacity basement roof slab 4. Throughout the process, the load completely bypasses the unstable backfill soil 5, thus achieving safe and reliable support.

[0033] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A construction elevator foundation for the backfill area of ​​a basement roof slab, characterized in that, include: Several vertical support members, the bottom of which is fixed to the basement roof slab (4); The foundation beam (2) is erected on top of the plurality of vertical support members and connects the plurality of vertical support members into an integral frame; The base plate (3) is located in the top space of the overall frame; The vertical support components, foundation beams (2) and foundation slabs (3) together form a load-bearing structural system. This load-bearing structural system spans the backfill soil (5) area between the basement roof slab (4) and the foundation slab (3) in an elevated manner, and transmits the load of the construction elevator to the basement roof slab (4) via the foundation slab (3), foundation beams (2) and vertical support components.

2. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 1, characterized in that, The number of the plurality of vertical support components is five, of which: four are arranged along the four corners of the foundation plate (3), and the other is arranged directly below the construction elevator.

3. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 2, characterized in that, The vertical support component is a vertical column pier (1) of reinforced concrete structure.

4. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 3, characterized in that, The vertical column pier (1) is provided with a vertical column pier main reinforcement (11) and a vertical column pier stirrup (12); the bottom of the vertical column pier main reinforcement (11) is pre-embedded in the basement top slab (4) and the embedding length is not less than the anchorage length La, and the top of the vertical column pier main reinforcement (11) is anchored in the foundation beam (2).

5. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 4, characterized in that, The main reinforcement (11) of the vertical column pier is HRB4008Φ18, and the stirrups (12) of the vertical column pier are HRB400Φ10@150.

6. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 3, characterized in that, A waterproof layer is provided on the basement roof slab (4), which is turned up along the side of the vertical column pier (1) and connected to it to form a continuous and seamless overall waterproof barrier.

7. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 3, characterized in that, The vertical column pier (1) has a cross-sectional side length of 0.3m to 0.6m; the foundation beam (2) is a reinforced concrete structure with a cross-sectional side length of 0.3m to 0.6m.

8. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 3 or 7, characterized in that, Five foundation beams (2) are provided in total. Both ends of the foundation beams (2) are fixed to the top of the vertical column pier (1) or inside the beam of the vertical column pier (1).

9. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 8, characterized in that, The foundation beam (2) is provided with foundation beam main reinforcement (21) and foundation beam stirrups (22). The top and bottom reinforcements of the foundation beam main reinforcement (21) are both HRB4002Φ18, and the foundation beam stirrups (22) are HRB400Φ8@150.

10. The construction elevator foundation for the backfill area of ​​the basement roof slab according to claim 9, characterized in that, The foundation slab (3) is a reinforced concrete slab with a thickness of 0.3m to 0.5m; the foundation slab (3) is equipped with double-layer bidirectional main reinforcement bars (31) with a specification of HRB400φ14@150, and the main reinforcement bars (31) are anchored in the foundation beam (2).

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