Combined supporting structure with double rows of piles
By adopting a combined support structure of double rows of piles in the foundation pit site, using the combined design of steel pipe piles and support piles, and combining the support method of oblique braces, the shortcomings of the traditional support structure in the scenarios of high and low differences and surrounding conditions are solved, and a more efficient and economical foundation pit support effect is achieved.
Patent Information
- Application Number
- CN202421554301.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-02
AI Technical Summary
When the foundation pit site has obvious height difference and the surrounding conditions are limited, the traditional double row high and low enclosure pile system cannot meet the environmental conditions of support construction, and there are problems such as large area, long construction period, and high cost.
A combined support structure with double rows of piles is adopted, including setting steel pipe piles on the higher side of the terrain, and a second crown beam is arranged on the top of it to enhance lateral stability and overall stiffness; supporting piles are arranged inside the foundation pit, the top surface of the support pile has a first crown beam, and the top surface of the steel pipe pile has a second crown beam, and oblique braces are arranged between the two to improve support performance and construction safety.
This structure significantly enhances the lateral stability and overall stiffness around the foundation pit, meets the environment where the construction interface is limited, reduces the dependence on large equipment, reduces the requirements for construction space, and can restrict deformation around the foundation pit, and ensures the internal stress of the basement for layered construction.
Smart Images
Figure CN222782071U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation pit engineering, in particular to a combined supporting structure of double-row piles. Background Art
[0002] With the large-scale development of urban land, the environment around the foundation pits of buildings in cities has become increasingly complex. In order to ensure the construction safety of underground structures and reduce the adverse effects on surrounding built structures, effective protective measures need to be taken on the side walls of the foundation pits.
[0003] In view of the complex and narrow environmental characteristics of the current foundation pit site, especially when the site has a significant height difference (the positive and negative zero of the surrounding buildings are higher than the ground elevation in the foundation pit), and the inclined anchor cables conflict with the foundations of buildings around the foundation pit and other buried objects, the traditional double-row high and low retaining piles combined with lateral supports and inclined anchor cable systems in many cases can no longer meet the environmental conditions required for support construction, and there are problems such as large footprint, long construction period, and high cost. Utility Model Content
[0004] The purpose of the utility model is to solve the problem in the prior art that there is a lack of suitable support methods when the foundation pit site has obvious height differences and the surrounding conditions are limited, and to provide a combined support structure with double-row piles.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A combined support structure of double-row piles comprises support piles and steel pipe piles, wherein the steel pipe piles are arranged around a foundation pit, the support piles are arranged inside the foundation pit, the top surface of the support piles has a first crown beam, the top surface of the steel pipe piles has a second crown beam, the top elevation of the steel pipe piles is higher than the top elevation of the first crown beam, and there is a diagonal brace between the top surface of the first crown beam and the steel pipe piles.
[0007] By adopting a combined support structure of double rows of piles described in the utility model, the space around the foundation pit is tight and there is no space for slope reduction. By arranging steel pipe piles on the side with higher terrain, the support depth is deep, and a second crown beam is arranged to connect the scattered steel pipe piles into a whole, the lateral stability and overall stiffness of the support structure are significantly enhanced. The steel pipe piles are vertical supports, which can meet the environment with limited construction interface. No large equipment is required for construction, the construction is convenient, and the requirements for construction space are low. Therefore, the deformation around the foundation pit can be restrained, which is beneficial to ensuring the internal force of the foundation pit during the layered construction of the basement; support piles are arranged inside the foundation pit, and the side with lower support depth requirements is more economical and convenient for the arrangement of construction machinery; the diagonal brace is supported on the top surface of the first crown beam. Compared with the traditional support structure, the support piles only bear the horizontal shear force of the diagonal brace. The support piles of the present application also bear the vertical support force of the diagonal brace, which is beneficial to improving the support performance and construction safety, and further makes it unnecessary to slope or set up a diagonal support system on the outside of the foundation pit, which is suitable for scenes with limited surrounding construction conditions.
[0008] Preferably, the spacing between the support piles and the steel pipe piles is greater than or equal to 1.5 times the depth of the steel pipe piles.
[0009] Preferably, soil nails are further provided on the soil on one side of the steel pipe pile.
[0010] Preferably, a horizontal support is provided between the support piles and the steel pipe piles.
[0011] Preferably, an upper support is provided on the pile body of the steel pipe pile, a lower support is provided on the top surface of the first crown beam, and the diagonal brace is connected between the upper support and the lower support.
[0012] Further preferably, the upper support and the lower support both include a connecting plate, a first supporting plate, a second supporting plate and a stiffening plate, the connecting plate is used to connect the first crown beam or steel pipe pile, and the first supporting plate, the second supporting plate and the connecting plate form a triangular structure.
[0013] Further preferably, the thickness of the connecting plate, the first supporting plate, the second supporting plate and the stiffening plate are all greater than or equal to 2 cm.
[0014] Further preferably, the connection plate of the upper support is connected to the steel pipe pile by welding, and the connection plate of the lower support is connected to the first crown beam by embedded reinforcement.
[0015] Further preferably, the slope of the diagonal brace is less than or equal to 1:2.
[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0017] 1. A combined support structure of double rows of piles described in the utility model is adopted. By setting steel pipe piles on the side with higher terrain, the support depth is deep, and a second crown beam is set to connect the scattered steel pipe piles into a whole, the lateral stability and overall stiffness of the support structure are significantly enhanced. The steel pipe piles are vertical supports, which can meet the environment with limited construction interface. No large equipment is required for construction, the construction is convenient, and the construction space requirement is low. Therefore, the deformation around the foundation pit can be restrained, which is beneficial to ensure the internal force of the foundation pit during the layered construction of the basement; support piles are set inside the foundation pit, and the side with lower support depth requirement is more economical and convenient for the arrangement of construction machinery; the diagonal brace is supported on the top surface of the first crown beam. Compared with the traditional support structure, the support pile only bears the horizontal shear force of the diagonal brace. The support pile of the present application also bears the vertical support force of the diagonal brace, which is beneficial to improving the support performance and construction safety, and further makes it unnecessary to slope the outer side of the foundation pit or set up a diagonal support system, which is suitable for scenes with limited surrounding construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic diagram of a combined support structure of double-row piles in Example 1;
[0019] Figure 2 is a schematic structural diagram of the upper support in Example 1;
[0020] Figure 3 is a schematic structural diagram of the lower support in Example 1;
[0021] Figure 4 is a schematic diagram of a combined support structure of double-row piles in Example 2;
[0022] Figure 5 It is a schematic diagram of a combined support structure of double-row piles in Example 3.
[0023] Icon: 1-support pile; 2-steel pipe pile; 21-second crown beam; 3-first crown beam; 41-upper support; 42-lower support; 401-connecting plate; 402-first support plate; 403-second support plate; 404-stiffening plate; 5-soil nails; 6-horizontal support. DETAILED DESCRIPTION
[0024] The utility model is described in detail below in conjunction with the accompanying drawings.
[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above-mentioned subject matter of the utility model is limited to the following embodiments, and all technologies realized based on the content of the utility model belong to the scope of the utility model.
[0026] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product / equipment / device of the utility model when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.
[0027] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding devices / components / elements are within the error / deviation range, they can still achieve their functions in the solution of the utility model.
[0028] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.
[0029] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.
[0030] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.
[0031] Example 1
[0032] The present embodiment adopts a double-row pile combined support structure, such as Figure 1-3 As shown, it includes supporting piles 1 and steel pipe piles 2. The steel pipe piles 2 are arranged around the foundation pit, and the supporting piles 1 are arranged inside the foundation pit. The top surface of the supporting piles 1 has a first crown beam 3, and the top surface of the steel pipe piles 2 has a second crown beam 21. The top elevation of the steel pipe piles 2 is higher than the top elevation of the first crown beam 3, and there is a diagonal brace 4 between the top surface of the first crown beam 3 and the steel pipe piles 2.
[0033] Specifically, the distance between the support pile 1 and the steel pipe pile 2 is greater than or equal to 1.5 times the depth of the steel pipe pile 2 .
[0034] The steel pipe pile 2 is provided with an upper support 41, the top surface of the first crown beam 3 is provided with a lower support 42, and the diagonal brace 4 is connected between the upper support 41 and the lower support 42. The upper support 41 and the lower support 42 both include a connecting plate 401, a first supporting plate 402, a second supporting plate 403 and a stiffening plate 404. The connecting plate 401 of the upper support 41 is used to connect the steel pipe pile 2, and the connecting plate 401 of the lower support 42 is used to connect the first crown beam 3. The first supporting plate 402, the second supporting plate 403 and the connecting plate 401 form a triangular structure, see Figure 2-Figure 3 The thickness of the connecting plate 401, the first supporting plate 402, the second supporting plate 403 and the stiffening plate 404 are all greater than or equal to 2 cm. The connecting plate 401 of the upper support 41 is welded to the steel pipe pile 2, and the connecting plate 401 of the lower support 42 is connected to the first crown beam 3 by planting reinforcement.
[0035] To ensure the force bearing performance, the slope of the diagonal brace 4 may be less than or equal to 1:2.
[0036] By setting steel pipe piles 2 on the side with higher terrain, the support depth is deep, and a second crown beam 21 is set to connect the scattered steel pipe piles 2 into a whole, the lateral stability and overall stiffness of the support structure are significantly enhanced. The steel pipe piles 2 are vertical supports, which can meet the environment with limited construction interface. No large equipment is required for construction, the construction is convenient, and the construction space requirement is low. Therefore, the deformation around the foundation pit can be constrained, which is conducive to ensuring the internal force of the foundation pit during the layered construction of the basement, and meeting the foundation pit support with a height difference of 6m; support piles 1 are set inside the foundation pit, which is more economical than traditional reinforced concrete double-row support piles and is also convenient for the arrangement of construction machinery; the diagonal brace 4 is supported on the top surface of the first crown beam 3. Compared with the traditional support pile 1, which only bears the horizontal shear force of the diagonal brace 4, the support pile 1 also has to bear the vertical support force of the diagonal brace 4, which can effectively improve the support performance and construction safety, and further makes it unnecessary to slope the outside of the foundation pit or set up a diagonal support system, which is suitable for scenes with limited surrounding construction conditions.
[0037] During construction, support piles 1 are constructed first, and low-row support piles are constructed from the original ground elevation. Then steel pipe piles 2 are constructed. First, pre-drill holes are made and seamless steel pipes are placed in them. Then, the foundation pit is excavated in layers. After the first excavation reaches the bottom elevation of the second pile crown beam 21, the second crown beam 21 is constructed. Then, excavation is continued. Each excavation does not exceed 2m. The excavation reaches the earthwork platform required for the construction of the diagonal brace 4. The top elevation of the earthwork platform is 0.5m below the upper support 41, and the upper support 41 is constructed. The excavation is continued to The top elevation of the supporting pile 1 is determined, and soil support is provided between the steel pipe piles 2. After hanging the mesh, the concrete panel is sprayed, and then the first crown beam 3 is constructed, and the lower support 42 is constructed on the first crown beam 3; thereafter, the diagonal brace 4 is arranged between the upper support 41 and the lower support 42, and the earth inside the support is excavated; then, the earth from the top of the supporting pile 1 to the base is excavated in layers until the foundation is constructed at the base elevation. After the structural beams and slabs have reached 80% of the design strength, the diagonal brace 4 can be removed and the construction of the basement structure can continue.
[0038] Example 2
[0039] The present embodiment adopts a double-row pile combined support structure, such as Figure 4 As shown, its structure is roughly the same as that of Example 1, except that a soil nail 5 is further provided on one side of the steel pipe pile 2. The parameters such as the diameter, the angle and the length of the soil nail 5 extending into the soil are set according to actual needs. The length of the soil nail 5 located in the upper soil can be longer than that of the soil nail 5 located in the lower soil, so as to further enhance the stability of the side with a deeper support depth.
[0040] Example 3
[0041] The present embodiment adopts a double-row pile combined support structure, such as Figure 5 As shown, its structure is roughly the same as that of Example 2, except that a horizontal support 6 is further provided between the supporting pile 1 and the steel pipe pile 2. The horizontal support 6 can be a reinforced concrete structure, and one end of the horizontal support 6 is connected to the first crown beam 3 and the other end is connected to the steel pipe pile 2.
[0042] Of course, on the basis of Embodiment 1, a horizontal support 6 may be additionally provided between the support pile 1 and the steel pipe pile 2 .
[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A combined support structure of double-row piles, characterized in that: The invention comprises a supporting pile (1) and a steel pipe pile (2), wherein the steel pipe pile (2) is arranged around a foundation pit, and the supporting pile (1) is arranged inside the foundation pit, the top surface of the supporting pile (1) has a first crown beam (3), and the top surface of the steel pipe pile (2) has a second crown beam (21), the top elevation of the steel pipe pile (2) is higher than the top elevation of the first crown beam (3), and a diagonal brace (4) is provided between the top surface of the first crown beam (3) and the steel pipe pile (2).
2. A combined support structure of double-row piles according to claim 1, characterized in that: The distance between the support pile (1) and the steel pipe pile (2) is greater than or equal to 1.5 times the depth of the steel pipe pile (2).
3. A combined support structure of double-row piles according to claim 1, characterized in that: A soil nail (5) is also provided on the soil body at one side of the steel pipe pile (2).
4. A combined support structure of double-row piles according to claim 1, characterized in that: A horizontal support (6) is also provided between the support pile (1) and the steel pipe pile (2).
5. A combined support structure of double-row piles according to any one of claims 1 to 4, characterized in that: An upper support (41) is provided on the pile body of the steel pipe pile (2), a lower support (42) is provided on the top surface of the first crown beam (3), and the diagonal brace (4) is connected between the upper support (41) and the lower support (42).
6. A combined support structure of double-row piles according to claim 5, characterized in that: The upper support (41) and the lower support (42) both comprise a connecting plate (401), a first supporting plate (402), a second supporting plate (403) and a stiffening plate (404); the connecting plate (401) is used to connect the first crown beam (3) or the steel pipe pile (2); the first supporting plate (402), the second supporting plate (403) and the connecting plate (401) form a triangular structure.
7. A combined support structure of double-row piles according to claim 6, characterized in that: The thickness of the connecting plate (401), the first supporting plate (402), the second supporting plate (403) and the stiffening plate (404) are all greater than or equal to 2 cm.
8. A combined support structure of double-row piles according to claim 6, characterized in that: The connecting plate (401) of the upper support (41) is connected to the steel pipe pile (2) by welding, and the connecting plate (401) of the lower support (42) is connected to the first crown beam (3) by planting reinforcement.
9. A combined support structure of double-row piles according to claim 5, characterized in that: The slope of the diagonal brace (4) is less than or equal to 1:2.