Foundation pit support structure
By combining precast piles and water-stopping components, and utilizing T-shaped steel structures and water-swellable water-blocking components, the problems of poor water-stopping effect and long construction period of foundation pit retaining structures were solved, achieving efficient and low-cost foundation pit construction.
Patent Information
- Application Number
- CN202520080734.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-14
AI Technical Summary
Existing foundation pit retaining structures suffer from problems such as poor water-stopping effect, long construction period and high cost during construction, especially the shortcomings of diaphragm walls and bored pile retaining structures.
The system employs a combination of precast piles and water-stopping components. The precast piles are equipped with T-shaped steel structures, and the water-stopping components are connected by interlocking T-shaped steel structures. Combined with water-swellable water-blocking components, an effective water-stopping system is formed, reducing reliance on traditional water-stopping curtains.
It achieves effective water-stopping during the foundation pit excavation process, shortens the construction cycle, reduces construction costs and carbon emissions, minimizes disturbance to the surrounding environment, and improves soil retention capacity.
Smart Images
Figure CN223753345U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to underground building construction technical field especially relates to a foundation pit support structure. BACKGROUND
[0002] With the continuous acceleration of urbanization process of our country, the development and utilization of underground space resources also get more and more attention, and a large number of underground construction projects have new requirements for foundation pit excavation: not only to ensure the safety and economy in the process of foundation pit excavation, but also need to have sustainability.
[0003] And the emergence of foundation pit support structure meets the above demand, and the foundation pit support structure mainly bears the water pressure and soil pressure generated by foundation pit excavation unloading and transmits the pressure to the support, and is a kind of construction temporary retaining wall structure for stabilizing foundation pit. At present, the commonly used vertical foundation pit support structure includes bored pile and underground continuous wall etc. Among them, the underground continuous wall has the advantages of large rigidity and good water stop performance, but the deficiency of underground continuous wall support structure is also obvious: high cost, long construction period and large construction difficulty. The bored pile support structure is mainly based on field pouring, and sets up water stop curtain to ensure the water stop effect in the process of foundation pit excavation, but it will affect the construction progress and increase the engineering cost, and the external water stop curtain will occupy certain construction space additionally.
[0004] Therefore, how to ensure the water stop effect in the process of foundation pit excavation while shortening the construction period and reducing the construction cost becomes a technical problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL
[0005] The utility model aims at providing a foundation pit support structure to ensure the water stop effect in the process of foundation pit excavation while shortening the construction period and reducing the construction cost.
[0006] To solve the above technical problems, the utility model provides a kind of foundation pit retaining structure, the foundation pit retaining structure, comprising: several precast piles and install between two adjacent precast piles waterstop component, wherein, each precast pile includes: pile body and two T-shaped steel structures fixed on pile body symmetry;Each waterstop component includes: first flange, second flange parallel with first flange, and at least one web vertically arranged between first flange and second flange, two ends of first flange respectively with two ends of second flange together constitute two T-shaped steel structure's web's occlusal mouth, based on the occlusal connection of T-shaped steel structure and waterstop component, waterstop component is installed on precast pile. Optionally, in the foundation pit retaining structure, each waterstop component further includes: four water-swelling water-blocking components, every two water-swelling water-blocking components are arranged at the inner side edge of an occlusal mouth to seal the occlusion gap between T-shaped steel structure and waterstop component. Optionally, in the foundation pit retaining structure, the waterstop component includes a web, and the web is vertically arranged at the middle position between the first flange and the second flange. Optionally, in the foundation pit retaining structure, the waterstop component includes a plurality of webs, and the plurality of webs are vertically arranged at equal intervals between the first flange and the second flange to form a box-shaped structure. Optionally, in the foundation pit retaining structure, the web of the T-shaped steel structure is welded and fixed with the reinforcement cage of the pile body. Optionally, in the foundation pit retaining structure, the T-shaped steel structure is a T-shaped steel. Optionally, in the foundation pit retaining structure, the length of the precast pile is equal to the length of the waterstop component. Optionally, in the foundation pit retaining structure, the length of the T-shaped steel structure is equal to the length of the waterstop component. Optionally, in the foundation pit retaining structure, the length of the T-shaped steel structure is less than or equal to the length of the pile body. The foundation pit retaining structure provided by the utility model has at least the following advantages:
[0007] 1) The foundation pit retaining structure of the utility model is used for construction, and a water-stop curtain is not needed for a foundation pit project with water-stopping requirements, so that the construction space is saved, the construction is beneficial to a small land space, the disturbance to the surrounding environment is reduced, and the cost is effectively reduced.
[0008] 2) The foundation pit retaining structure of the utility model is used for construction, and the water-stop component is self-provided, so that the construction speed is faster than that of the traditional bored pile retaining structure combined with a water-stop curtain, and the construction period is greatly shortened.
[0009] 3) The foundation pit retaining structure of the utility model is used for construction, and the water-stop component is installed between the precast piles, so that the cement consumption is effectively saved, and the carbon emission caused by underground structure construction is reduced.
[0010] 4) The water-stop component of the foundation pit retaining structure has a large soil retaining effect due to the structural design, so that the precast pile spacing can be appropriately increased, and the number of precast piles is reduced.
[0011] 5) When the underground structure is completed, the water stop member can be pulled out for reuse, which reduces the construction cost and the carbon emission of the building construction. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 is a vertical plane schematic view of the foundation pit retaining structure in an embodiment of the utility model;
[0013] Figure 2 is a cross-sectional schematic view of the connection between the precast pile and the water stop member in an embodiment of the utility model;
[0014] Figure 3 is Figure 2 a cross-sectional schematic view along the A-A aspect in the figure;
[0015] Figure 4 is a schematic view of the seepage path of the underground water outside the pit into the pit after the foundation pit retaining structure is used in an embodiment of the utility model;
[0016] Figure 5 is a schematic view of one structure of the water stop member in an embodiment of the utility model;
[0017] Figure 6 is a schematic view of another structure of the water stop member in an embodiment of the utility model;
[0018] Figure 7 is a schematic view of the structure of the precast pile in an embodiment of the utility model;
[0019] Figure 8 is a cross-sectional schematic view when the water stop member is engaged with the T-shaped steel structure in an embodiment of the utility model.
[0020] In the figure:
[0021] 1-precast pile; 11-pile body; 12-T-shaped steel structure;
[0022] 2-water stop member; 21-first flange; 22-second flange; 23-web; 24-engaging opening; 25-water-swelling water-stopping component. DETAILED DESCRIPTION
[0023] The foundation pit retaining structure proposed by the utility model is further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the utility model will be clearer according to the following description and claims. It should be noted that the drawings are all very simplified and use non-precise proportions, and are only used to facilitate and clarify the purpose of assisting in the description of the embodiments of the utility model.
[0024] The utility model will be described further in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so they only show the structure related to the utility model.
[0025] In the description of the utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as limiting the utility model.
[0026] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0027] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0028] Please refer to Figures 1 to 3 , Figure 7 , Figure 8 The foundation pit support structure comprises: a plurality of precast piles 1 and water stop members 2 installed between adjacent two precast piles 1, wherein each precast pile 1 comprises: a pile body 11 and two T-shaped steel structures 12 symmetrically fixed on the pile body 11; each water stop member 2 comprises: a first flange 21, a second flange 22 parallel to the first flange 21, and at least one web 23 vertically arranged between the first flange 21 and the second flange 22, the two ends of the first flange 21 and the two ends of the second flange 22 jointly form two engagement openings 24 of the webs 23 of the adaptive T-shaped steel structures 12, and the water stop member 2 is installed on the precast pile 1 based on the engagement connection of the T-shaped steel structure 12 and the water stop member 2.
[0029] As Figure 3 andFigure 8 As shown, the T-shaped steel structure 12 and the water-stop component 2 are interlocked. There is a certain space between the flange of the T-shaped steel structure 12 and the web plate 23 of the water-stop component 2, which allows for relatively flexible installation / disassembly of the two.
[0030] Specifically, such as Figure 4 As shown, in actual construction, after adopting the foundation pit retaining structure, the groundwater outside the pit forms an Ω-shaped seepage path into the pit, thus demonstrating that the foundation pit retaining structure can guarantee a good water-stopping effect. Furthermore, for foundation pit projects with water interception requirements, there is no need for a separate water-stop curtain, saving building space, which is beneficial for construction in confined spaces, reducing disturbance to the surrounding environment, and effectively lowering costs. In addition, since the foundation pit retaining structure has its own water-stopping component 2, compared to the traditional combination of bored pile retaining structure and water-stop curtain, the construction speed is faster, greatly shortening the construction period and further reducing construction costs.
[0031] For details, please refer to Figure 7 The web 23 of the T-shaped steel structure 12 is welded and fixed to the reinforcing cage of the pile body 11. Compared to traditional precast piles, in the precast pile 1 of this invention, a T-shaped steel structure 12 is welded to both sides of the reinforcing cage of the pile body 11 during the manufacturing stage. Furthermore, the web 23 of the T-shaped steel structure 12 is vertically welded to the reinforcing cage of the pile body 11, so that the final precast pile 1 has a T-shaped steel structure 11, facilitating the subsequent installation of the water-stopping component 2 on the precast pile 1. In this embodiment, the T-shaped steel structure is preferably a T-shaped steel.
[0032] This invention improves upon traditional discrete bored piles by replacing them with precast piles 1 that have a built-in T-shaped steel structure (equivalent to a water-stop buckle). This provides the installation medium between the precast pile 1 and the water-stop component 2, while also ensuring the water-stopping / water-blocking effect between the two precast piles 1. Therefore, there is no need for a separate water-stop curtain, avoiding the space waste associated with such a curtain, and also preventing additional disturbance to the surrounding soil caused by the construction of a water-stop curtain.
[0033] For further details, please refer to... Figure 5 and Figure 6Each waterstop member 2 further comprises four water-stopping components 25 that expand when in contact with water, each of which is arranged at the inner edge of one of the two engaging openings 24 to seal the gap between the T-shaped steel structure and the waterstop member 2, thereby making full use of the water-stopping effect of the pile body 11, greatly improving the water-stopping function of the pile support structure while saving the use of pure water-stopping materials. The water-stopping components 25 are made of water-stopping material that expands when in contact with water and is mainly used for waterproofing and leak stopping. Such material is usually made by mixing high-molecular water-absorbing material with rubber and has the characteristics of water expansion and high elasticity. When water seeps into the material, the internal structure absorbs water, causing the volume to expand, thereby filling the gaps and cracks and forming an effective water-stopping barrier.
[0034] Specifically, the waterstop member 2 as the water-stopping part of the foundation pit support structure has a length that meets the water-stopping requirement, which can be shorter than or equal to the length of the precast pile. Specifically, the length of the T-shaped steel structure is equal to the length of the waterstop member 2, and the length of the T-shaped steel structure is less than or equal to the length of the pile body 11. In this example, the foundation pit support structure adopts the structure design of precast pile + waterstop member 2, and the waterstop member 2 is made of steel plate, which effectively saves the amount of cement and reduces carbon emissions caused by underground structure construction.
[0035] In this embodiment, please refer to Figure 5 The waterstop member 2 comprises a web 23 that is vertically arranged at the middle position between the first flange 21 and the second flange 22. Compared with the traditional single-layer water-stopping steel plate, the waterstop member 2 of the utility model has a similar I-shaped cross section, which can greatly increase the moment of inertia of the cross section, thereby improving the vertical bending stiffness of the waterstop member 2.
[0036] In another embodiment, please refer to Figure 6 The waterstop member 2 comprises a plurality of webs 23 that are vertically arranged at equal intervals between the first flange 21 and the second flange 22 to form a box structure. Compared with the structure of the waterstop member 2 shown in Figure 5 Due to the increase in the number of webs 23, Figure 6 the vertical bending stiffness of the waterstop member 2 shown in Figure 6The water stop member 2 shown can not only guarantee the water stop effect, but also can reduce the number of prefabricated piles used in the foundation pit support structure, effectively shorten the construction period and reduce the construction cost. Understandably, the size specification of the water stop member 2 of the utility model can be prepared according to the spacing between the two prefabricated piles, and the number of webs 23 arranged between the first flange 21 and the second flange 22 needs to be calculated according to the spacing size combined with the retaining pressure borne by the construction needs.
[0037] The foundation pit support structure provided by the utility model has at least the following beneficial effects:
[0038] 1) The foundation pit support structure of the utility model is used for construction, and a water stop curtain does not need to be additionally arranged for the foundation pit engineering with water stop requirements, building space is saved, which is beneficial to the construction of small land space, reduces the disturbance to the surrounding environment caused by construction, and effectively reduces the cost;
[0039] 2) The foundation pit support structure of the utility model is used for construction, and since the water stop member is self-provided, compared with the construction speed of the traditional bored pile support structure combined with the water stop curtain, the construction speed is fast, and the construction period is greatly shortened;
[0040] 3) The foundation pit support structure of the utility model is used for construction, the water stop member is installed between the prefabricated piles, the cement consumption is effectively saved, and then the carbon emission caused by the underground structure construction is reduced.
[0041] 4) The water stop member of the foundation pit support structure has a large retaining effect based on the structural design, the prefabricated pile spacing can be appropriately increased, and the number of prefabricated piles is reduced;
[0042] 5) After the underground structure construction is completed, the water stop member can be pulled out for repeated use, which reduces the engineering cost and the carbon emission of building construction. Understandably, the above examples are only examples listed for better understanding of the technical scheme of the embodiment of the application, and are not the only limitation of the embodiment.
[0043] Secondly, those skilled in the art should also know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the application.
[0044] Obviously, those skilled in the art can make various modifications and changes to the utility model without departing from the spirit and scope of the utility model. Therefore, if the modifications and changes of the utility model belong to the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these modifications and changes.
Claims
1. A foundation enclosure, characterized by, The utility model relates to a waterstop structure for a precast pile, comprising: a plurality of precast piles and waterstop members installed between adjacent two precast piles, wherein each precast pile comprises a pile body and two T-shaped steel structures symmetrically fixed on the pile body; each waterstop member comprises a first flange, a second flange parallel to the first flange, and at least one web plate vertically arranged between the first flange and the second flange, two ends of the first flange and two ends of the second flange together form two engagement openings of the web plates of the T-shaped steel structures, and the waterstop member is installed on the precast pile based on the engagement connection of the T-shaped steel structures and the waterstop member.
2. The excavation enclosure of claim 1, wherein, Each waterstop member further comprises four water-blocking components that swell when exposed to water, and each two water-blocking components are arranged at the inner side edges of one engagement opening to seal the engagement gap between the T-shaped steel structures and the waterstop member.
3. The excavation enclosure of claim 1, wherein, The waterstop member comprises one web plate vertically arranged at the middle position between the first flange and the second flange.
4. The excavation enclosure of claim 1, wherein, The waterstop member comprises a plurality of web plates vertically arranged at equal intervals between the first flange and the second flange to form a box-shaped structure.
5. The foundation enclosure according to any one of claims 1 to 4, wherein The web plate of the T-shaped steel structure is welded and fixed with the steel cage of the pile body.
6. The foundation enclosure according to any one of claims 1 to 4, wherein The T-shaped steel structure is a T-shaped steel.
7. The foundation enclosure according to any one of claims 1 to 4, wherein The length of the precast pile is equal to the length of the waterstop member.
8. The foundation enclosure according to any one of claims 1 to 4, wherein The length of the T-shaped steel structure is equal to the length of the waterstop member.
9. The foundation enclosure according to any one of claims 1 to 4, wherein The length of the T-shaped steel structure is less than or equal to the length of the pile body.