A new garage retaining wall and supporting structure of low-span outside existing building

Abstract

A kind of new garage retaining wall of low-span of existing building periphery and its supporting structure belong to underground engineering construction technical field. Including supporting pile, brick membrane and inside formwork, supporting pile, brick membrane and inside formwork are sequentially arranged along the direction away from existing building, and pouring cavity of retaining wall is formed between brick membrane and inside formwork, supporting pile is provided with transverse tensioning screw rod, tensioning screw rod sequentially passes through brick membrane and inside formwork, supporting pile and brick membrane form outside formwork of retaining wall, and pouring cavity of retaining wall is formed between inside formwork, supporting pile is vertically arranged, can effectively consolidate the land strength of garage ground groove edge, prevent uneven settlement caused by stress release in existing building interior, directly buried in underground when landfill, convenient operation;And the tensioning screw rod arranged on supporting pile can link inside formwork and outside formwork firmly, form complete formwork system, have enough strength, rigidity and stability.

Description

Technical Field

[0001] A retaining wall and its support structure for a new low-span garage on the periphery of an existing building, belonging to the field of underground engineering construction technology. Background Technology

[0002] The retaining wall is the underground portion of the garage's exterior wall. Its exterior is filled with backfill soil from the trench, connecting to the existing building, while the interior is the newly constructed underground garage. Currently, my country's real estate market, dominated by incremental development, is stabilizing and maturing. The era of stock-based development, based on the circulation of second-hand homes and housing asset management, is rapidly approaching. Urban renewal and the construction of new underground garages in older residential areas are becoming inevitable trends in real estate development.

[0003] The regulations require that when a new building is adjacent to an existing building, the foundation depth of the new building should not exceed that of the existing building's foundation. Otherwise, a certain distance should be maintained between the two foundations, the value of which should be determined based on the load of the existing building, the foundation type, and the soil conditions. This is because when the foundation elevation of a new underground parking garage exceeds that of the existing building's foundation, creating a height difference, the existing building is prone to uneven settlement during excavation due to the release of internal stress, which may lead to cracking or tilting of the existing building. Therefore, the choice of structure and construction method for the retaining wall of the new parking garage becomes a technical challenge. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a retaining wall and its support structure for a new low-span garage on the periphery of an existing building, which can effectively prevent uneven settlement caused by stress release inside the existing building during the excavation of the new underground garage, thereby causing the existing building to crack or tilt.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The retaining wall support structure of the new low-span garage on the periphery of the existing building includes support piles, brick formwork and inner template. The support piles, brick formwork and inner template are arranged in sequence along the direction away from the existing building. The brick formwork and the inner template form a casting cavity for the retaining wall. The support piles are provided with transverse tie rods, which pass through the brick formwork and the inner template in sequence.

[0006] Preferably, the support pile consists of a support pipe and filling material inside the pipe.

[0007] Preferably, the distance between two adjacent retaining piles is 0.3~0.5m.

[0008] A retaining wall includes retaining piles, a brick formwork, and a retaining wall. The retaining piles, the brick formwork, and the retaining wall are arranged sequentially in a direction away from the existing building, and a waterproof layer is provided between the retaining wall and the brick formwork.

[0009] Preferably, it also includes a foundation cushion layer, with a brick formwork and a waterproof layer placed on the upper side of the foundation cushion layer, the foundation cushion layer being horizontally placed inside the support piles, and the depth of the support piles being greater than the depth of the foundation cushion layer.

[0010] Preferably, the lower end of the support pile is set below the lower surface of the foundation cushion layer.

[0011] Preferably, the gap between the support pile and the brick formwork is filled with a layer of filling sand.

[0012] Preferably, it also includes waterproof mortar, which is placed between the brick formwork and the waterproof layer.

[0013] Preferably, an additional waterproof layer is provided inside the waterproof layer, and the additional waterproof layer is disposed around the tie rod.

[0014] Compared with existing technologies, the beneficial effects of this technical solution are: This utility model uses support piles and brick formwork to form the outer template of the retaining wall, creating a pouring cavity between the outer and inner templates. The vertically installed support piles effectively strengthen the soil at the edge of the basement trench, preventing uneven settlement caused by stress release within the existing building. They are directly buried underground during backfilling, making operation convenient. Furthermore, the tie rods installed on the support piles firmly connect the inner and outer templates, forming a complete template system with sufficient strength, rigidity, and stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a retaining wall support structure for a newly built low-span garage on the periphery of an existing building, according to the present invention.

[0016] Figure 2 This is a cross-sectional view of the present invention.

[0017] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle.

[0018] Among them: 1. Support piles 2. Brick formwork 3. Retaining wall 4. Inner formwork 5. Tie rods 6. Sand backfill gaps 7. Waterproof mortar 8. Waterproof layer of retaining wall 9. Waterproof layer of garage raft slab 10. Foundation pad 11. Garage raft slab 12. Retaining wall reinforcement 13. Raft slab reinforcement 14. Ground trench 15. Existing building 16. Existing building foundation raft slab 17. Additional waterproof layer. Detailed Implementation

[0019] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0020] Reference Figures 1-3 The retaining structure of the low-span new garage retaining wall of the existing building includes support piles 1, brick formwork 2 and inner template 4. The support piles 1 are filled with materials and have horizontal tie rods 5 on them. The tie rods 5 pass through the brick formwork 2 and the inner template 4 in sequence. The support piles 1 and the brick formwork 2 form the outer template, and a casting cavity is formed between them and the inner template 4.

[0021] The underground parking garage of this utility model is adjacent to the existing building 15. The underground parking garage trench is excavated in sections and steps. The length of each section is no more than 15m along the longitudinal and transverse directions parallel to the existing building 15, and the depth is consistent with the depth of the foundation raft slab 16 of the existing building. After each section is excavated, the support piles 1 are driven in by static pressure. The support piles 1 of this utility model are made of steel pipe with a pointed bottom and a size of D159*6mm. The inside of the support pile 1 is filled with C30 fine stone concrete. After the C30 fine stone concrete reaches the design strength, the next adjacent 15m section is excavated.

[0022] After the trench 14 is fully excavated, the trench continues to be excavated downwards in the order of the first 15m, until it is level with the bottom elevation of the foundation pad 10 of the underground garage. This process is carried out in sections. After the trench of the underground garage is excavated in sections and steps, the foundation pad 10 is laid according to the design requirements. The brick formwork 2 is built on the foundation pad 10. The brick formwork 2 is set adjacent to the support pile 1 and serves as the outer formwork of the retaining wall. Together with the inner formwork 4, it forms the formwork of the entire retaining wall.

[0023] Tie rods 5 are welded onto the support pile 1. The tie rods 5 horizontally pass through the brick formwork 2 and then through the inner template 4. The extension length of the tie rods should meet the fixing length of the nuts.

[0024] After the brick formwork 2 is completed, a layer of waterproof mortar 7 is applied to its inner facade. The sand backfill gap 6 between the outer facade and the support pile 1 is backfilled with sand and compacted in layers. At this point, the outer formwork of the retaining wall is formed and stabilized.

[0025] According to the design requirements, waterproofing is required for the foundation pad 10 and the brick formwork 2. The retaining wall waterproofing layer 8 is placed inside the waterproof mortar 7, and the garage raft slab waterproofing layer 9 is placed on top of the foundation pad 10. Since the tie rods 5 pass through the brick formwork 2, an additional waterproofing layer 17 is applied around them. After the waterproofing layer and reinforcement are completed, the inner formwork 4 is installed on the foundation pad 10. The entire structure is formed using tie rods and internal bracing to create the retaining wall formwork. Then, concrete is poured to form the retaining wall 3 and the garage raft slab 11. After the concrete reaches the required demolding strength, the inner formwork layer 4 is removed, and excess tie rods 5 are cut off. The retaining wall completed using this practical method is of reliable quality and exhibits no deformation or twisting.

[0026] Work process: The underground garage trench was excavated in sections, and support piles 1 were driven in. C30 fine stone concrete was injected into each support pile 1 pipe. Foundation pad 10 was laid. Brick formwork 2 was built. Waterproof mortar was applied to the inside of the brick formwork 2, and sand was backfilled between the outer facade and the support piles 1. Waterproof layer was applied. Reinforcing bars were tied, and inner formwork 4 was installed. The formwork was reinforced as a whole. Concrete was poured to complete the retaining wall and garage raft slab.

[0027] The above description is merely one embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-described technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, shall still fall within the protection scope of this utility model's technical solution.

Claims

1. A support structure for a retaining wall of a newly constructed low-span garage on the periphery of an existing building, characterized in that: It includes support piles (1), brick formwork (2) and inner template (4). The support piles (1), brick formwork (2) and inner template (4) are set in sequence away from the existing building. The brick formwork (2) and the inner template (4) form a cavity for the pouring of the retaining wall. The support piles (1) are provided with horizontal tie rods (5). The tie rods (5) pass through the brick formwork (2) and the inner template (4) in sequence.

2. The support structure for a retaining wall of a newly built low-span garage on the periphery of an existing building according to claim 1, characterized in that: The support pile (1) consists of a support pipe and the filling material inside the pipe.

3. The support structure for a retaining wall of a newly built low-span garage on the periphery of an existing building according to claim 1, characterized in that: The distance between two adjacent retaining piles (1) is 0.3~0.5m.

4. A retaining wall formed using the support structure of a newly constructed low-span garage retaining wall on the periphery of an existing building as described in any one of claims 1 to 3, characterized in that: It includes support piles (1), brick formwork (2) and retaining wall (3). The support piles (1), brick formwork (2) and retaining wall (3) are arranged in sequence away from the existing building. A waterproof layer is provided between the retaining wall (3) and the brick formwork (2).

5. The retaining wall according to claim 4, characterized in that: It also includes a foundation cushion layer (10), a brick formwork (2) and a waterproof layer set on the upper side of the foundation cushion layer (10), the foundation cushion layer (10) is set horizontally on the inner side of the support piles (1), and the depth of the support piles (1) is greater than the depth of the foundation cushion layer (10).

6. The retaining wall according to claim 4, characterized in that: The lower end of the support pile (1) is set below the lower surface of the foundation cushion layer (10).

7. The retaining wall according to claim 4, characterized in that: The gap between the support pile (1) and the brick formwork (2) is filled with a layer of filling sand.

8. The retaining wall according to claim 4, characterized in that: It also includes waterproof mortar (7), which is placed between the brick formwork (2) and the waterproof layer.

9. The retaining wall according to claim 4, characterized in that: A waterproof additional layer (17) is provided inside the waterproof layer, and the waterproof additional layer (17) is set around the tie rod (5).

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