A method for synchronous construction of a foundation pit and a structure adjacent to the foundation pit

Abstract

The application provides a method for synchronous construction of a foundation pit and a structure adjacent to the foundation pit, and the method comprises the following steps: S1, constructing a low-area pile foundation, a fender and a high-area pile foundation; wherein the bearing layer of the high-area pile foundation is selected below a low-area raft foundation bottom elevation line; S2, grading outside the foundation pit, and simultaneously excavating soil layers in all first batch subblocks of the foundation pit to the low-area raft foundation bottom elevation line and constructing a structure adjacent to the foundation pit; S3, forming a raft foundation in all first batch subblocks of the foundation pit; and S4, simultaneously excavating soil layers in all second batch subblocks of the foundation pit to the low-area raft foundation bottom elevation line and constructing an upper structure adjacent to the foundation pit and a basement structure of the first batch subblocks. By arranging the bearing layer of the high-area pile foundation of the foundation pit below the bottom of the raft foundation of the low-area foundation pit and by grading and strip-excavating the foundation pit, the synchronous construction of the foundation pit and the structure adjacent to the foundation pit is realized, the construction progress of the whole project is greatly accelerated, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a method for synchronous construction of foundation pits and adjacent structures outside the foundation pits. BACKGROUND

[0002] In the process of engineering construction, there are often adjacent foundation pits that need to be constructed at the same time in the same project. Usually, one foundation pit is excavated after the other foundation pit is excavated to zero. There are many construction cases. However, in special cases, adjacent foundation pits will face the problem of synchronous construction of foundation pit construction and adjacent structures outside the foundation pit. There is no related synchronous construction scheme and example for this problem.

[0003] Therefore, how to carry out synchronous construction of foundation pits and adjacent structures outside the foundation pits is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a method for synchronous construction of foundation pits and adjacent structures outside the foundation pits to carry out synchronous construction of foundation pits and adjacent structures outside the foundation pits.

[0005] To solve the above technical problems, the present application provides a method for synchronous construction of foundation pits and adjacent structures outside the foundation pits, which comprises the following steps:

[0006] S1: According to the design file and the construction scheme, the low area pile foundation, the enclosure and the high area pile foundation are constructed; wherein the bearing layer of the high area pile foundation is selected below the low area raft foundation bottom elevation line;

[0007] S2: The slope outside the foundation pit is put, the soil layer in the first batch of blocks of all foundation pits is excavated to the low area raft foundation bottom elevation line, and the adjacent structure of the foundation pit is constructed at the same time, the adjacent structure comprises: raft foundation, pile cap and column;

[0008] S3: The raft foundation is formed in the first batch of blocks of all foundation pits;

[0009] S4: The soil layer in the second batch of blocks of all foundation pits is excavated to the low area raft foundation bottom elevation line, and the adjacent upper structure and the basement structure of the first batch of blocks of the foundation pit are constructed at the same time; wherein the basement structure of the first batch of blocks and the adjacent upper structure both comprise: column, beam and plate.

[0010] Optionally, in the method for synchronous construction of foundation pits and adjacent structures outside the foundation pits, in S1, the enclosure is Larsen steel sheet pile, cast-in-place pile, sheet pile or underground continuous wall.

[0011] Optionally, in the method for synchronous construction of foundation pits and adjacent structures outside the foundation pits, in S1, the process of constructing the high area pile foundation comprises:

[0012]

[0012] constructing a high area pile foundation of a predetermined length below the low area raft foundation bottom elevation line, the bearing capacity of the high area pile foundation of the predetermined length being able to satisfy the bearing requirement of the upper structure of the adjacent foundation pit.

[0013] Optionally, in the method for synchronously constructing the foundation pit and the adjacent structure outside the foundation pit, in S2, the pile cap is a single pile cap, a three-pile cap or a four-pile cap.

[0014] Optionally, in the method for synchronously constructing the foundation pit and the adjacent structure outside the foundation pit, in S2, the reinforcement of the pile cap in the adjacent structure outside the foundation pit is denser than the reinforcement of the raft foundation in the adjacent structure.

[0015] Optionally, in the method for synchronously constructing the foundation pit and the adjacent structure outside the foundation pit, in S2, the process of synchronously excavating the soil layers in the first batch of sub-blocks of all the foundation pits to the low area raft foundation bottom elevation line by the strip method comprises:

[0016] When the excavation depth of the soil layers in the first batch of sub-blocks reaches a predetermined depth, diagonal bracing or additional support needs to be added.

[0017] Optionally, in the method for synchronously constructing the foundation pit and the adjacent structure outside the foundation pit, in S4, the process of synchronously excavating the soil layers in the second batch of sub-blocks of all the foundation pits to the low area raft foundation bottom elevation line by the strip method comprises:

[0018] When the excavation depth of the soil layers in the second batch of sub-blocks reaches a predetermined depth, diagonal bracing or additional support needs to be added.

[0019] In the method for synchronously constructing the foundation pit and the adjacent structure outside the foundation pit provided by the application, the method comprises: S1: constructing a low area pile foundation, a fender and a high area pile foundation according to design documents and a construction plan; wherein the bearing stratum of the high area pile foundation is selected below the low area raft foundation bottom elevation line; S2: sloping the ground outside the foundation pit, synchronously excavating the soil layers in the first batch of sub-blocks of all the foundation pits to the low area raft foundation bottom elevation line by the strip method, and constructing the adjacent structure of the foundation pit at the same time, the adjacent structure comprising a raft foundation, a pile cap and a column; S3: forming the raft foundation in the first batch of sub-blocks of all the foundation pits; S4: synchronously excavating the soil layers in the second batch of sub-blocks of all the foundation pits to the low area raft foundation bottom elevation line by the strip method, and constructing the adjacent upper structure of the foundation pit and the basement structure of the first batch of sub-blocks at the same time; wherein the basement structure of the first batch of sub-blocks and the adjacent upper structure both comprise a column, a beam and a plate. By arranging the bearing stratum of the high area pile foundation of the foundation pit below the bottom of the raft foundation of the low area foundation pit and by strip excavation of the foundation pit, the synchronous construction of the foundation pit and the adjacent structure outside the foundation pit is realized, the construction progress of the entire project is greatly accelerated, and the construction period is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the figures, and wherein:

[0021] Figure 1 is a method flow chart of synchronous construction of a foundation pit and a structure adjacent to the foundation pit in an embodiment of the present application;

[0022] Figure 2 is a schematic plan view of a pile foundation enclosure in an embodiment of the present application;

[0023] Figure 3 is a schematic profile view of a pile foundation enclosure in an embodiment of the present application;

[0024] Figure 4 is a schematic plan view of earthwork excavation of a foundation pit and a structure adjacent to the foundation pit in an embodiment of the present application;

[0025] Figure 5 is a schematic profile view of earthwork excavation of a foundation pit and a structure adjacent to the foundation pit in an embodiment of the present application;

[0026] Figure 6 is a schematic plan view of backfilling of a basement of a foundation pit and an upper structure adjacent to the foundation pit in an embodiment of the present application;

[0027] Figure 7 is a schematic profile view of backfilling of a basement of a foundation pit and an upper structure adjacent to the foundation pit in an embodiment of the present application.

[0028] In the drawings:

[0029] 1 - low-zone pile foundation; 2 - enclosure; 3 - low-zone raft foundation bottom elevation line; 4 - high-zone pile foundation; 5 - pile cap; 6 - raft foundation; 7 - column; 8 - slope; 9 - beam; 10 - plate; 11 - compartment joint;

[0030] S1 - first batch of sub-blocks; S2 - second batch of sub-blocks

[0031] Ln - predetermined length. DETAILED DESCRIPTION

[0032] The method of synchronous construction of a foundation pit and a structure adjacent to the foundation pit according to the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present application will become more apparent from the following description and claims. It should be noted that the drawings are very simplified and use non-precise proportions, only for the purpose of facilitating and clarifying the purpose of assisting in the description of the embodiments of the present application.

[0033] The application will be described in further detail below with reference to the drawings. These drawings are simplified schematic diagrams which only show the basic structure of the application in a schematic manner, and thus only show the components relevant to the application.

[0034] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0035] 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 technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In the application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, 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 those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0037] Please refer to Figure 1 , which is a structural schematic diagram of the method for synchronous construction of a foundation pit and adjacent structures outside the foundation pit according to the application. As shown in Figure 1 , the method for synchronous construction of the foundation pit and the adjacent structures outside the foundation pit comprises:

[0038] First, please refer to Figure 1 and Figure 2 , execute step S1 to construct low-area pile foundation 1, enclosure 2 and high-area pile foundation 4 according to the design file and construction plan; wherein the bearing layer of the high-area pile foundation 4 is selected below the low-area raft foundation bottom elevation line 3; wherein the enclosure 2 is a Larsen steel sheet pile, a cast-in-place pile, a sheet pile or an underground continuous wall.

[0039] The process of constructing the high-area pile foundation 4 comprises:

[0040] The high zone pile foundation 4 of the predetermined length Ln below the low zone raft foundation bottom elevation line 3 (i.e. the red part of the high zone pile foundation 4 below the low zone raft foundation bottom elevation line 3 in the figure) has a bearing capacity that can meet the bearing requirement of the upper structure of the adjacent foundation pit out of ±0.000 (i.e. the part of the high zone pile foundation 4 below the low zone raft foundation bottom elevation line 3 needs to meet the bearing capacity requirement) to ensure the stability and bearing capacity of the high zone pile foundation 4. It can be understood that when selecting the bearing stratum of the high zone pile foundation, the physical properties of the soil layer, such as compressibility, strength and stability, should be considered.

[0041] Next, please refer to Figure 3 and Figure 4 , step S2 is performed, the foundation pit is sloped out 8, and the soil layers in the first batch of blocks S1 of all foundation pits are excavated synchronously to the low zone raft foundation bottom elevation line 3, while the adjacent structures of the foundation pit are constructed, including: raft foundation 6, pile cap 5 and column 7; Specifically, the pile cap 5 is a single pile cap, a three-pile cap or a four-pile cap. The preferred embodiment is a four-pile cap, and the number and configuration of the piles can be determined based on engineering requirements and geological conditions to ensure the stability and safety of the structure.

[0042] Preferably, the reinforcement of the pile cap 5 in the adjacent structure of the foundation pit is denser than the reinforcement of the raft foundation 6 in the adjacent structure.

[0043] Next, please refer to Figure 5 and Figure 6 , step S3 is performed to form the raft foundation 6 in the first batch of blocks S1 of all foundation pits.

[0044] Next, please refer to Figure 5 and Figure 6 , step S4 is performed, and the soil layers in the second batch of blocks S2 of all foundation pits are excavated synchronously to the low zone raft foundation bottom elevation line 3, while the adjacent upper structure and the basement structure of the first batch of blocks S1 of the foundation pit are constructed; wherein the basement structure of the first batch of blocks S1 and the adjacent upper structure both include: column 7, beam 9 and plate 10. The construction of the basement structure of the first batch of blocks S1 is specifically the reconstruction of the column 7, beam 9 and plate 10 of the basement structure.

[0045] Figure 4 and Figure 6 The demarcation line between the first batch of blocks S1 and the second batch of blocks S2 is the compartment joint 11.

[0046] By setting the bearing stratum of the pile foundation in the high area of the foundation pit below the bottom of the raft foundation in the low area of the foundation pit and by strip excavation of the foundation pit in blocks, synchronous construction of the foundation pit and the adjacent structures outside the foundation pit (the adjacent structures and the adjacent upper structures) is realized, which greatly speeds up the construction progress of the whole project and shortens the construction period.

[0047] Further, in the execution of steps S2 and S4, the process of strip excavation of the soil layers in the first batch of blocks S1 and the second batch of blocks S2 of all the foundation pits to the low-area raft foundation bottom elevation line 3 is involved, and when the excavation depth reaches the predetermined depth, it is necessary to consider adding diagonal bracing or adding support to ensure the stability and safety of the foundation pit wall, prevent soil collapse and deformation, control the deformation and settlement of the foundation pit, prevent damage to the surrounding buildings, and ensure the personal safety of the construction personnel.

[0048] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should 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 present application.

[0049] In summary, in the method for synchronous construction of a foundation pit and adjacent structures outside the foundation pit provided by the present application, by setting the bearing stratum of the pile foundation in the high area of the foundation pit below the bottom of the raft foundation in the low area of the foundation pit and by strip excavation of the foundation pit in blocks, synchronous construction of the foundation pit and the adjacent structures outside the foundation pit is realized, which greatly speeds up the construction progress of the whole project and shortens the construction period.

[0050] The above description is only a description of the preferred embodiments of the present application, and does not limit the scope of the present application in any way. Any modification or modification of the present application by those skilled in the art based on the above disclosure is within the scope of protection of the claims.

Claims

1. A method for synchronously constructing a foundation pit and a structure adjacent to the foundation pit, characterized in that, The method comprises the following steps: S1: according to the design file and the construction scheme, constructing the low-area pile foundation (1), the enclosure (2) and the high-area pile foundation (4); wherein the bearing layer of the high-area pile foundation (4) is selected below the low-area raft foundation bottom elevation line (3); S2: excavating the soil layer in the first batch of blocks (S1) of all foundation pits to the low-area raft foundation bottom elevation line (3) by strip extraction and synchronous excavation, and simultaneously constructing the adjacent structure outside the foundation pit, wherein the adjacent structure comprises the raft foundation (6), the pile cap (5) and the column (7); S3: forming the raft foundation (6) in the first batch of blocks (S1) of all foundation pits; S4: excavating the soil layer in the second batch of blocks (S2) of all foundation pits to the low-area raft foundation bottom elevation line (3) by strip extraction and synchronous excavation, and simultaneously constructing the adjacent upper structure and the basement structure of the first batch of blocks (S1); wherein the basement structure of the first batch of blocks (S1) and the adjacent upper structure both comprise the column (7), the beam (9) and the plate (10).

2. The method of claim 1, wherein, In S1, the enclosure (2) is a Larsen steel sheet pile, a cast-in-place pile, a sheet pile or an underground continuous wall.

3. The method of claim 1, wherein the method further comprises: In S1, the process of constructing the high-area pile foundation (4) comprises: constructing the high-area pile foundation (4) with a predetermined length (Ln) below the low-area raft foundation bottom elevation line (3), and the bearing capacity of the high-area pile foundation (4) with the predetermined length (Ln) can meet the bearing requirement of the upper structure of the adjacent foundation pit before ±0.

000.

4. The method of claim 1, wherein the method further comprises: In S2, the pile cap (5) is a single-pile cap, a three-pile cap or a four-pile cap.

5. The method for simultaneous construction of a foundation pit and a structure adjacent to the foundation pit according to claim 1, wherein, In S2, the reinforcement of the pile cap (5) in the adjacent structure outside the foundation pit is denser than the reinforcement of the raft foundation (6) in the adjacent structure.

6. The method for simultaneous construction of a foundation pit and a structure adjacent to the foundation pit according to any one of claims 1 to 5, wherein In S2, the process of excavating the soil layer in the first batch of blocks (S1) of all foundation pits to the low-area raft foundation bottom elevation line (3) by strip extraction and synchronous excavation comprises: when the excavation depth of the soil layer in the first batch of blocks (S1) reaches a predetermined depth, diagonal bracing or additional support needs to be added.

7. The method for simultaneous construction of a foundation pit and a structure adjacent to the foundation pit according to any one of claims 1 to 5, wherein In S4, the process of excavating the soil layer in the second batch of blocks (S2) of all foundation pits to the low-area raft foundation bottom elevation line (3) by strip extraction and synchronous excavation comprises: when the excavation depth of the soil layer in the second batch of blocks (S2) reaches a predetermined depth, diagonal bracing or additional support needs to be added.

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