Supporting structure for preventing horizontal displacement of engineering pile in foundation pit excavation
By using support structures of multiple rows of engineering piles and multi-layer foam concrete layers in foundation pit excavation, the problem of excessive horizontal displacement of engineering piles during deep foundation pit excavation is solved, and the effect of effectively dispersing lateral pressure, reducing horizontal displacement, and ensuring the stability of the foundation pit is achieved.
Patent Information
- Application Number
- CN202422157124.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-03
AI Technical Summary
When excavating deep foundation pits in soft plastic silt, huge vertical loads are converted into horizontal loads, resulting in excessive horizontal displacement of the engineering piles, shear failure and other adverse effects, threatening the subsequent use function of the pile foundation.
The supporting structure of multiple rows of engineering piles and multi-layer foam concrete layers is adopted. The engineering piles are distributed at intervals along the first direction. The foam concrete layer is distributed in a stepped manner between the engineering piles, forming a stable support structure frame to disperse and balance the lateral pressure generated during the excavation of the foundation pit.
Effectively reduce the horizontal displacement caused by uneven pressure of engineering piles, enhance the ability of engineering piles to resist horizontal displacement, ensure the stability of the edge of foundation pit, and maintain the long-term use function of engineering piles.
Smart Images
Figure CN223017646U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure belongs to the technical field of municipal engineering, and particularly relates to a supporting structure for preventing the horizontal displacement of engineering piles during foundation pit excavation. Background Art
[0002] With the large-scale development and utilization of underground space, a large number of deep foundation pit projects have emerged. There are the following technical problems in excavating deep foundation pits in soft plastic silt:
[0003] 1) Due to the characteristics of low bearing capacity, high compressibility, and rheology of silt, when large excavation equipment travels on the silt stratum, huge vertical loads will be converted into horizontal loads acting on the engineering piles of the main structure. Usually, the horizontal bearing capacity of slender rigid piles cannot meet this horizontal thrust. In the above situation, it often causes adverse effects such as excessive horizontal displacement of engineering piles and shear failure of engineering piles, seriously threatening the subsequent use function of the pile foundation.
[0004] 2) Due to the large water content in the silt stratum, rheological effects will be generated when it is disturbed during the foundation pit excavation process. The displacement of the silt stratum acting on the rigid engineering piles will also exacerbate the horizontal displacement of the project until horizontal shear failure. Summary of the Invention
[0005] The purpose of the present disclosure is to provide a supporting structure for preventing the horizontal displacement of engineering piles during foundation pit excavation, which can solve at least some of the above technical problems.
[0006] The first aspect of the embodiments of the present disclosure provides a supporting structure for preventing the horizontal displacement of engineering piles during foundation pit excavation, and the supporting structure includes:
[0007] Multiple rows of engineering piles, spaced apart along the first direction;
[0008] Multiple layers of foam concrete layers, distributed in a stepped shape along the first direction, and each layer of the foam concrete layer is located between adjacent two rows of the engineering piles.
[0009] The main technical effect achieved by the embodiments of the present disclosure is that the spaced distribution of multiple rows of engineering piles and multiple layers of foam concrete layers forms a stable supporting structure framework, effectively dispersing and balancing the lateral pressure generated during the foundation pit excavation process, and reducing the horizontal displacement of the engineering piles caused by uneven pressure.
[0010] Optionally, the side surface of the engineering pile is provided with uneven textures.
[0011] The main technical effect achieved by the embodiments of the present disclosure is that the uneven textures on the side surface of the engineering pile increase the friction coefficient with the foam concrete, improve the bonding force between the pile body and the concrete layer, and thus enhance the ability of the engineering pile to resist horizontal displacement during the foundation pit excavation and use period.
[0012] Optionally, the thickness of the foamed concrete layer is 30 - 60 cm.
[0013] The main technical effects achieved by the embodiments of the present disclosure are as follows: The thickness of the foamed concrete layer is selected to be 30 - 60 cm. This thickness range can provide sufficient lateral support force, while maintaining the economy of the material and the feasibility of construction, ensuring the stability of the foundation pit edge and reducing the horizontal displacement of the piles.
[0014] Optionally, the layer height of the multi-layer foamed concrete layer is 1.5 - 2 m.
[0015] The main technical effects achieved by the embodiments of the present disclosure are as follows: The layer height is controlled within 1.5 - 2 m, allowing construction machinery to safely travel on the foamed concrete layer, while reducing the impact and pressure on the engineering piles caused by single excavation, and reducing the risk of pile displacement due to excessive instantaneous load.
[0016] Optionally, the support structure further includes a plurality of drainage channels, and each drainage channel is arranged between adjacent two layers of the foamed concrete layer.
[0017] The main technical effects achieved by the embodiments of the present disclosure are as follows: The arrangement of the drainage channels between adjacent foamed concrete layers ensures that the accumulated water in the foundation pit can be drained in time, avoiding soil softening and the decline of the bearing capacity of the engineering piles caused by long-term water accumulation, thereby maintaining the stability of the engineering piles.
[0018] Optionally, the support structure further includes a plurality of connectors; one ends of the plurality of connectors are respectively installed on each engineering pile, and the other ends of the plurality of connectors are hook-shaped and respectively extend into the corresponding foamed concrete layer during pouring.
[0019] The main technical effects achieved by the embodiments of the present disclosure are as follows: The hook-shaped design of the connectors enables them to penetrate deep into the foamed concrete layer, forming a firm mechanical lock with the pile body and the concrete layer, enhancing the overall stiffness of the support structure, and effectively resisting the horizontal forces that may occur during the foundation pit excavation process.
[0020] Optionally, the support structure further includes a sensor and a data recorder fixed on the engineering pile for real-time monitoring of the horizontal displacement of the engineering pile.
[0021] The main technical effects achieved by the embodiments of the present disclosure are as follows: The real-time monitoring function of the sensor and the data recorder can timely detect the horizontal displacement of the engineering pile, provide accurate data support for the construction party, and timely take measures to adjust the construction plan or strengthen the support to ensure construction safety.
[0022] Optionally, an anchoring device is provided at the top of the engineering pile, and the anchoring device includes:
[0023] The anchoring plate is fixed to the top of the engineering pile and is used to disperse the pressure from the foamed concrete layer.
[0024] The anchor bolts pass through the anchoring plate and are connected to the engineering pile to improve the stability and bearing capacity of the pile top.
[0025] The main technical effects achieved by the embodiments of the present disclosure are as follows: Through the application of the anchoring plate and the anchor bolts, the anchoring device effectively disperses the pressure of the foamed concrete layer, prevents the pile top from being damaged due to concentrated stress, improves the stability of the pile top, and enhances the bearing capacity of the entire support structure.
[0026] Optionally, a steel mesh is laid on the surface of the foamed concrete layer.
[0027] The main technical effects achieved by the embodiments of the present disclosure are as follows: The laying of the steel mesh increases the crack resistance and durability of the foamed concrete layer, prevents the crack propagation caused by construction loads or environmental factors, maintains the integrity of the concrete layer, and thus improves the stability of the support structure.
[0028] Optionally, a waterproof membrane is also laid on the surface of the foamed concrete layer.
[0029] The main technical effects achieved by the embodiments of the present disclosure are as follows: The laying of the waterproof membrane effectively isolates the erosion of water on the foamed concrete layer, prevents the degradation of material properties caused by water, ensures that the concrete layer can maintain good mechanical properties under various environmental conditions, and maintains the long-term stability of the engineering pile. Description of the Drawings
[0030] Figure 1 It is a schematic diagram of a support structure for preventing the horizontal displacement of engineering piles during the excavation of a foundation pit in an embodiment of the present disclosure.
[0031] Description of the reference numerals: 1. Foamed concrete layer; 2. Engineering pile. Detailed Embodiments
[0032] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The manners described in the following exemplary embodiments do not represent all manners consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.
[0033] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. Unless otherwise defined, the technical terms or scientific terms used in this disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar terms used in the specification and claims of this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one, and will be further specified separately if only referring to "one". "Plurality" or "several" means two or more. Unless otherwise indicated, the terms such as "front", "rear", "lower" and / or "upper" are for convenience of description only and are not limited to a position or a spatial orientation. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms of "a", "the" and "said" used in the specification and appended claims of this disclosure are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0034] As Figure 1 shown, a support structure for preventing the horizontal displacement of the engineering piles 2 during the excavation of a foundation pit according to an embodiment of the present disclosure, the support structure includes multiple rows of engineering piles 2 and multiple layers of foamed concrete layers 1.
[0035] The multiple rows of engineering piles 2 are spaced apart along a first direction; wherein, the engineering piles 2 serve as the main load-bearing components of the support structure and are spaced apart along the perimeter of the foundation pit to form a uniform support network. This distribution pattern helps to evenly bear the lateral pressure and loads generated during the excavation of the foundation pit, reduce local stress concentration, and thus reduce the risk of horizontal displacement of the engineering piles 2 due to excessive stress.
[0036] The multiple layers of foamed concrete layers 1 are distributed in a stepped manner along the first direction. This design allows each layer of foamed concrete layer 1 to gradually bear and disperse the pressure from the overlying soil layer during the excavation process. The stepped distribution also helps to form multiple stable support platforms, provides a stable working surface for construction machinery, and at the same time reduces the direct pressure on the underlying engineering piles 2.
[0037] Each layer of foam concrete layer 1 is located between two adjacent rows of engineering piles 2, forming a continuous and integral support structure. This filling effect not only enhances the connection strength between the engineering piles 2, but also improves the stability and deformation resistance of the overall structure by increasing the contact area.
[0038] That is, the combined use of the engineering piles 2 and the foam concrete layer 1 forms a synergistic system. The engineering piles 2 provide the main vertical support force, while the foam concrete layer 1 provides the necessary horizontal support and dispersion force. This synergistic effect significantly improves the adaptability and safety of the support structure for the foundation pit excavation under complex geological conditions.
[0039] Through the above structural design, the horizontal force on the engineering piles 2 is effectively dispersed and absorbed by the foam concrete layer 1, reducing the possibility of horizontal displacement of the engineering piles 2 due to uneven stress. This is crucial for maintaining the stability of the foundation pit and ensuring construction safety.
[0040] It should be noted that when casting the above support structure on-site, it is necessary to wait for 2 - 4 days until the strength of the upper layer of foam concrete layer 1 reaches 100%, then the construction machinery can walk on this foam concrete layer 1 and continue to excavate the next layer, and so on until reaching the bottom of the ground.
[0041] As an optional implementation method, the side of the engineering pile 2 is provided with uneven textures. Among them, the textures can be spiral textures, wave textures, dot textures, strip textures, mesh textures, microporous textures, etc. The uneven textures on the side of the engineering pile 2 increase the friction coefficient with the foam concrete, improve the bonding force between the pile body and the concrete layer, and thus enhance the ability of the engineering pile 2 to resist horizontal displacement during the foundation pit excavation and use.
[0042] As an optional implementation method, the thickness of the foam concrete layer 1 is 30 - 60 cm. This thickness range can provide sufficient lateral support force, while maintaining the economy of the material and the feasibility of construction, ensuring the stability of the foundation pit edge and reducing the horizontal displacement of the pile body.
[0043] As an optional implementation method, the layered height of the multi-layer foam concrete layer 1 is 1.5 - 2 m. This height allows the construction machinery to walk safely on the foam concrete layer 1, while reducing the impact and pressure on the engineering piles 2 caused by single excavation, and reducing the risk of pile body displacement due to excessive instantaneous load.
[0044] As an optional implementation method, the support structure further includes a number of drainage channels, and each drainage channel is arranged between two adjacent layers of foam concrete layer 1 to ensure that the accumulated water in the foundation pit can be drained in time, avoiding soil softening and the decline of the bearing capacity of the engineering piles 2 caused by long-term water accumulation, and thus maintaining the stability of the engineering piles 2.
[0045] As an alternative implementation, the support structure further includes a plurality of connecting members; one ends of the plurality of connecting members are respectively installed on each engineering pile 2, and the other ends of the plurality of connecting members are hook-shaped and respectively extend into the corresponding foamed concrete layer 1 during pouring. The hook-shaped design of the connecting member enables it to penetrate deep into the foamed concrete layer 1, forming a firm mechanical lock with the pile body and the concrete layer, enhancing the overall stiffness of the support structure, and effectively resisting the horizontal force that may occur during the foundation pit excavation process.
[0046] As an alternative implementation, the support structure further includes a sensor and a data recorder fixed on the engineering pile 2 for real-time monitoring of the horizontal displacement of the engineering pile 2. The real-time monitoring function of the sensor and the data recorder can timely detect the horizontal displacement condition of the engineering pile 2, provide accurate data support for the construction party, and timely take measures to adjust the construction plan or strengthen the support to ensure construction safety.
[0047] As an alternative implementation, an anchoring device is provided at the top of the engineering pile 2. The anchoring device includes an anchor plate and anchor bolts. On the one hand, during the foundation pit excavation process, the foamed concrete layer 1 will exert pressure on the engineering pile 2. The anchoring device disperses these pressures through the combination of the anchor plate and the anchor bolts, thereby reducing the risk of the engineering pile 2 being damaged due to excessive stress. On the other hand, the application of the anchoring device enhances the connection between the engineering pile 2 and the foamed concrete layer 1, improving the reliability of the overall support structure. In the face of various dynamic loads that may occur during the foundation pit excavation process, this enhanced connection can ensure the integrity and safety of the structure.
[0048] The anchor plate is fixed to the top of the engineering pile 2, and its design can be planar or have a specific geometric shape to adapt to the structure of the pile top. The main function of the anchor plate is to provide a broad contact surface to disperse the pressure from the foamed concrete layer 1 to a larger area, reducing the local stress concentration on the pile top.
[0049] The anchor bolts pass through the anchor plate and are connected to the engineering pile 2. This design allows the bolts to fasten the anchor plate, ensuring that it becomes an integral part with the engineering pile 2. The fastening force of the bolts can further enhance the connection strength between the anchor plate and the engineering pile 2.
[0050] As an alternative implementation, a steel mesh is laid on the surface of the foamed concrete layer 1. The laying of the steel mesh increases the crack resistance and durability of the foamed concrete layer 1, prevents the crack propagation caused by construction loads or environmental factors, maintains the integrity of the concrete layer, and thus improves the stability of the support structure.
[0051] As an optional implementation, a waterproof membrane is also laid on the surface of the foamed concrete layer 1. The waterproof membrane can include polyethylene (PE) waterproof membrane, polyvinyl chloride (PVC) waterproof membrane, high-density polyethylene (HDPE) waterproof membrane, butyl rubber waterproof membrane, epoxy resin waterproof membrane, acrylic waterproof membrane, asphalt-based waterproof membrane, silicone rubber waterproof membrane, etc. The laying of the waterproof membrane effectively isolates the erosion of moisture on the foamed concrete layer 1, prevents the degradation of material properties caused by moisture, ensures that the concrete layer can maintain good mechanical properties under various environmental conditions, and maintains the long-term stability of the engineering pile 2.
[0052] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.
Claims
1. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation, characterized in that: The support structure comprises: A plurality of rows of engineering piles are spaced apart along a first direction; The multiple foamed concrete layers are distributed in a stepped manner along the first direction, and each foamed concrete layer is located between two adjacent rows of engineering piles.
2. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The side surface of the engineering pile is provided with an uneven texture.
3. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The thickness of the foam concrete layer is 30 to 60 cm.
4. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The layer height of the multi-layer foam concrete layer is 1.5 to 2 meters.
5. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The supporting structure further comprises a plurality of drainage channels, each of which is arranged between two adjacent layers of the foam concrete.
6. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The support structure also includes a plurality of connectors; one end of the plurality of connectors is respectively installed on each engineering pile, and the other end of the plurality of connectors is hook-shaped and extends into the corresponding foam concrete layer during pouring.
7. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The support structure also includes sensors and data recorders fixed on the engineering piles for real-time monitoring of the horizontal displacement of the engineering piles.
8. The supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: An anchoring device is provided on the top of the engineering pile, and the anchoring device comprises: Anchor plates, fixed to the top of the engineering piles, are used to disperse the pressure from the foam concrete layer; Anchor bolts pass through the anchor plate and are connected to the engineering piles to improve the stability and bearing capacity of the pile top.
9. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: A steel mesh is laid on the surface of the foam concrete layer.
10. A supporting structure for preventing horizontal displacement of engineering piles during foundation pit excavation according to claim 1, characterized in that: The surface of the foam concrete layer is also paved with a waterproof membrane.