An underground parking building system

Abstract

The utility model discloses an underground garage building system, including the multiple pile foundation (1) of setting in foundation pit and the bottom plate (2) on foundation pit, the top of pile foundation (1) is equipped with the bearing platform (3), is equipped with the prop (4) on the bearing platform (3), the bearing platform (3) is equipped with the bearing platform reinforcement cage (5) in, the bottom plate (2) is equipped with the bottom plate reinforcement cage (6) with bearing platform reinforcement cage (5) top department links in, the side of bearing platform reinforcement cage (5) is equipped with the first stirrup (7) of connecting its upper and lower end, and the first stirrup (7) is connected bottom plate reinforcement cage (6), the utility model discloses through the first stirrup and strengthens the load resistance intensity of bearing platform side, balance bearing platform middle part load simultaneously through the prop insertion reinforcement connection pile foundation, reduce the generation of the bending moment and shearing force on bearing platform, and the reliability is good.

Description

Technical Field

[0001] This utility model relates to the field of building construction, and in particular to an underground parking lot building system. Background Technology

[0002] To alleviate urban land use conflicts and improve land utilization, underground parking lots are widely used in various buildings. However, as an underground building system, underground parking lots have complex load conditions and are prone to stress imbalance. Their foundations need to bear multiple loads, including the self-weight of the superstructure (columns, floor slabs, walls, etc.), vehicle live loads (including stationary parking loads and moving impact loads), and earth pressure. Among these, vehicle live loads are random and dynamic, which may lead to local stress concentration in the foundation. If the load distribution is uneven (such as off-center parking of vehicles or asymmetrical column arrangement), it may also cause eccentric stress on the foundation, generating additional bending moments and shear forces, which may exceed the design expectations. Utility Model Content

[0003] The purpose of this invention is to provide an underground parking garage construction system. This invention strengthens the load-bearing capacity of the side of the foundation by using a first stirrup, and balances the load in the middle of the foundation by connecting the pile foundation with the support reinforcement bars, thereby reducing the generation of bending moment and shear force on the foundation and exhibiting excellent reliability.

[0004] The technical solution of this utility model is as follows: An underground parking lot construction system includes multiple pile foundations set in a foundation pit and a base slab on the foundation pit. The top of the pile foundation is provided with a pile cap, and a column is provided on the pile cap. A pile cap reinforcement cage is provided inside the pile cap. A base slab reinforcement cage connected to the top of the pile cap reinforcement cage is provided inside the base slab. The side of the pile cap reinforcement cage is provided with a first stirrup connecting its upper and lower ends. The first stirrup is connected to the base slab reinforcement cage. The top of the pile foundation is provided with anchoring reinforcement connected to the pile cap reinforcement cage. The column is provided with a column insert inserted into the pile cap reinforcement cage. The bottom of the column insert is provided with a bent anchor bar connected to the anchoring reinforcement.

[0005] In the aforementioned underground parking garage construction system, the foundation reinforcement cage includes multiple linearly arranged first U-shaped bottom bars with their ends facing upwards. Multiple linearly arranged second U-shaped bottom bars with their ends facing upwards are provided on the inner side of the bottom of the first U-shaped bottom bars. Second stirrups are connected to the inner sides of the sides of the first and second U-shaped bottom bars. Anchor bars are connected to the bottom of the first and second U-shaped bottom bars. The second stirrups, the sides and tops of the first and second U-shaped bottom bars are connected to the foundation slab reinforcement cage.

[0006] In the aforementioned underground parking garage construction system, the end of the second U-shaped bottom reinforcement bar is bent horizontally and connected to the top of the bottom slab reinforcement cage.

[0007] In the aforementioned underground parking garage construction system, the upper and lower sides of the first stirrup are respectively connected to the bottom of the second U-shaped bottom reinforcement and the horizontal bend at the end of the second U-shaped bottom reinforcement; the lower side of the first stirrup is attached to the first U-shaped bottom reinforcement.

[0008] In the aforementioned underground parking garage construction system, the bottom slab reinforcement cage includes a mesh-like top reinforcement and a mesh-like bottom reinforcement, with a reinforcing bar between the top reinforcement and the bottom reinforcement; the bottom reinforcement is attached to the foundation pit surface and connects the upper part of the foundation reinforcement cage and the middle part of the first stirrup; the top reinforcement connects the top of the foundation reinforcement cage and the first stirrup.

[0009] In the aforementioned underground parking garage construction system, the bottom reinforcement extends into the steel cage of the foundation.

[0010] In the aforementioned underground parking garage construction system, the support reinforcement bars are provided with vertically evenly distributed positioning stirrups.

[0011] In the aforementioned underground parking garage construction system, the spacing of the positioning stirrups outside the foundation is smaller than the spacing of the positioning stirrups inside the foundation.

[0012] Compared with the prior art, this utility model is equipped with a first stirrup, which connects the upper and lower ends of the bottom slab reinforcement cage and the pile cap reinforcement cage. On the one hand, it strengthens the load-bearing capacity of the pile cap side by increasing support, so as to effectively cope with the live load in the underground parking lot. On the other hand, it strengthens the connection with the bottom slab, has better integration, and balances the load distribution of the two. The support column dowel is inserted into the pile cap reinforcement cage and directly connected to the pile foundation through the bent anchor bar at the bottom. On the one hand, it can enhance the overall rigidity of the support column, and on the other hand, it can reduce the load at the corresponding position of the pile cap, balance the overall stress of the pile cap, reduce the generation of bending moment and shear force on the pile cap, and has good reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a top view of the structure of this utility model.

[0015] The markings in the attached diagram are as follows: 1. Pile foundation; 2. Base slab; 3. Pile cap; 4. Column; 5. Pile cap reinforcement cage; 6. Base slab reinforcement cage; 7. First stirrup; 8. Anchor reinforcement; 9. Column dowel bar; 10. Bent anchor bar; 11. First U-shaped bottom reinforcement; 12. Second U-shaped bottom reinforcement; 13. Second stirrup; 14. Top reinforcement; 15. Bottom reinforcement; 16. Reinforcing bar; 17. Positioning stirrup. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example: An underground parking garage construction system, as shown in the attached document. Figure 1 and attached Figure 2As shown, the structure includes multiple pile foundations 1 set within the foundation pit and a base slab 2 cast on plain concrete in the pit. A pile cap 3, located on the plain concrete and between brick formwork, is cast on top of the pile foundations 1. Support columns 4 are cast on the pile cap 3. A pile cap reinforcement cage 5 is pre-tied within the pile cap 3. A base slab reinforcement cage 6, pre-tied and connected to the top of the pile cap reinforcement cage 5, is pre-tied within the base slab 2. First stirrups 7, connecting the upper and lower ends of the pile cap reinforcement cage 5, are tied to the sides of the pile cap reinforcement cage 5. The first stirrups 7 are connected to the base slab reinforcement cage 6 by tying. Anchor reinforcement bars 8 are attached to the top of the pile foundations 1 and tied to the pile cap reinforcement cage 5. Support columns 4 have support inserts 9 inserted into the pile cap reinforcement cage 5. The bottom of the reinforcing bar 9 is processed with a bent anchor bar 10 welded to the anchoring reinforcing bar 8; the foundation reinforcement cage 5 includes multiple linearly arranged first U-shaped bottom bars 11 with their ends facing upwards, and multiple linearly arranged second U-shaped bottom bars 12 with their ends facing upwards are tied together on the inner side of the bottom of the first U-shaped bottom bars 11. The inner sides of the sides of the first U-shaped bottom bars 11 and the second U-shaped bottom bars 12 are tied together with connected second stirrups 13; the bottoms of the first U-shaped bottom bars 11 and the second U-shaped bottom bars 12 are connected to the anchoring reinforcing bar 8 by tying; the second stirrups 13, the sides and tops of the first U-shaped bottom bars 11 and the sides and tops of the second U-shaped bottom bars 12 are connected to the bottom slab reinforcement cage 6, forming a double-layer U-shaped reinforcement cage. The bottom reinforcement bars form the load-bearing skeleton at the bottom of the pile cap, enhancing the bottom's compressive and crack resistance. The bottom is connected to the anchor reinforcement bars, and the sides and top are connected to the bottom slab reinforcement cage, ensuring uniform transmission of pile foundation reaction force and pile cap load, reducing localized stress. The end of the second U-shaped bottom reinforcement bar 12 is horizontally bent and tied to the top of the bottom slab reinforcement cage 6. The upper and lower sides of the first stirrup 7 are respectively connected to the bottom of the second U-shaped bottom reinforcement bar 12 and the horizontal bend at the end of the second U-shaped bottom reinforcement bar 12. The horizontal bend increases the connection length and contact area with the bottom slab reinforcement cage, allowing the vertical load of the pile cap to be transmitted to the bottom slab more smoothly. The lower side of the first stirrup 7 is attached to the first U-shaped bottom reinforcement bar 11 for load transmission. The bottom slab reinforcement cage 6 includes a mesh-like top reinforcement bar 14 and a mesh-like bottom reinforcement bar 15, which are connected by welding to form a load-bearing structure. The bottom reinforcement 16; the bottom reinforcement 15 fits against the foundation pit surface and connects the upper part of the foundation reinforcement cage 5 and the middle part of the first stirrup 7; the top reinforcement 14 connects the top of the foundation reinforcement cage 5 and the first stirrup 7, and the top and bottom reinforcements connect the foundation reinforcement cage and the first stirrup respectively, so that the bottom plate, foundation, and first stirrup form a cooperative force-bearing system to balance the overall load; the bottom reinforcement 15 extends into the foundation reinforcement cage 5, so that the foundation load is diffused to the bottom plate and local overload is avoided; vertically evenly distributed positioning stirrups 17 are welded inside the support dowel 9; the spacing of the positioning stirrups 17 outside the foundation 3 is smaller than the spacing of the positioning stirrups 17 inside the foundation 3. The positioning stirrups fix the vertical position of the support dowel and prevent it from shifting during concrete pouring. The smaller spacing outside the foundation can enhance the rigidity of the support outside the foundation, better resist lateral forces, and improve the stability of the support.

[0018] Working principle: The upper load (such as the structural self-weight transmitted by the column 4 and the vehicle live load) is transmitted to the pile cap 3 through the column dowel 9. Most of the load is directly transmitted to the anchoring steel bar 8 of the pile foundation 1 through the bent anchor bar 10 at the bottom of the column dowel, reducing the load in the middle of the pile cap. The load borne by the pile cap itself (such as local vehicle load and lateral earth pressure) is borne by the pile cap steel cage 5 (first U-shaped bottom bar 11, second U-shaped bottom bar 12, and second stirrup 13). It is transmitted to the anchoring steel bar 8 through the bottom of the first U-shaped bottom bar 11 and the second U-shaped bottom bar 12, and then to the pile foundation 1. At the same time, it is transmitted to the bottom slab steel cage 6 through the horizontal bending section at the end of the first stirrup 7 and the second U-shaped bottom bar 12 on the side, and then distributed by the bottom slab 2.

[0019] The first stirrup 7 enhances the stiffness of the side of the pile cap 3, resists lateral forces, and ensures that the components do not misalign or deform under vehicle impact, earth pressure, or earthquake action, thus maintaining overall stability. The direct connection between the support reinforcement 9 and the pile foundation 1 (bent anchor bars 10 and anchoring bars 8) reduces load concentration in the middle of the pile cap 3, lowering bending moment and shear force. The multi-node connection between the double-layer U-shaped bottom reinforcement, the first stirrup 7, and the bottom slab reinforcement cage 6 ensures that the load is evenly distributed between the pile cap 3 and the bottom slab 2, preventing local stress from exceeding the material strength.

[0020] The above embodiments merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. Furthermore, in these embodiments, "up," "down," "left," "right," "front," and "back" represent relative positions only, not absolute positions. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An underground parking garage construction system, comprising a plurality of pile foundations (1) disposed in a foundation pit and a base slab (2) above the foundation pit, wherein a pile cap (3) is provided on the top of the pile foundations (1), and a support column (4) is provided on the pile cap (3), characterized in that: The foundation (3) is provided with a foundation reinforcement cage (5), and the bottom plate (2) is provided with a bottom plate reinforcement cage (6) connected to the top of the foundation reinforcement cage (5). The side of the foundation reinforcement cage (5) is provided with a first stirrup (7) connecting its upper and lower ends. The first stirrup (7) is connected to the bottom plate reinforcement cage (6). The top of the pile foundation (1) is provided with an anchoring reinforcement (8) connected to the foundation reinforcement cage (5). The support column (4) is provided with a support column insert (9) inserted into the foundation reinforcement cage (5). The bottom of the support column insert (9) is provided with a bent anchor bar (10) connected to the anchoring reinforcement (8).

2. The underground parking garage construction system according to claim 1, characterized in that: The foundation reinforcement cage (5) includes multiple linearly arranged first U-shaped bottom bars (11) with their ends facing upwards. Multiple linearly arranged second U-shaped bottom bars (12) with their ends facing upwards are provided on the inner side of the bottom of the first U-shaped bottom bars (11). The inner side of the sides of the first U-shaped bottom bars (11) and the second U-shaped bottom bars (12) are provided with connected second stirrups (13). The bottom of the first U-shaped bottom bars (11) and the second U-shaped bottom bars (12) are connected to anchor bars (8). The second stirrups (13), the sides and top of the first U-shaped bottom bars (11) and the sides and top of the second U-shaped bottom bars (12) are connected to the foundation reinforcement cage (6).

3. The underground parking garage construction system according to claim 2, characterized in that: The end of the second U-shaped bottom reinforcement (12) is bent horizontally and connected to the top of the bottom plate reinforcement cage (6).

4. The underground parking garage construction system according to claim 3, characterized in that: The upper and lower sides of the first stirrup (7) are respectively connected to the bottom of the second U-shaped bottom bar (12) and the horizontal bend at the end of the second U-shaped bottom bar (12); the lower side of the first stirrup (7) is attached to the first U-shaped bottom bar (11).

5. The underground parking garage construction system according to claim 1, characterized in that: The bottom slab reinforcement cage (6) includes a mesh-like top reinforcement (14) and a mesh-like bottom reinforcement (15), with a reinforcing bar (16) between the top reinforcement (14) and the bottom reinforcement (15); the bottom reinforcement (15) fits against the foundation pit surface and connects the upper part of the foundation reinforcement cage (5) and the middle part of the first stirrup (7); the top reinforcement (14) connects the top of the foundation reinforcement cage (5) and the first stirrup (7).

6. The underground parking garage construction system according to claim 5, characterized in that: The bottom reinforcement (15) extends into the foundation reinforcement cage (5).

7. The underground parking garage construction system according to claim 1, characterized in that: The support bar (9) is provided with vertically evenly distributed positioning stirrups (17).

8. The underground parking garage construction system according to claim 1, characterized in that: The spacing of the positioning stirrups (17) outside the foundation (3) is smaller than the spacing of the positioning stirrups (17) inside the foundation (3).

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