Unequal-depth adjacent foundation pit structure suitable for soft soil area

Abstract

The utility model provides an unequal-depth adjacent foundation pit structure suitable for a soft soil area, which comprises a deep foundation pit non-common enclosure structure, a shallow foundation pit non-common enclosure structure, a common foundation pit enclosure structure, a shallow foundation pit bottom plate and a connecting structure, the deep foundation pit non-common enclosure structure comprises an upper enclosure section located above the common foundation pit enclosure structure and a lower enclosure section located below the common foundation pit enclosure structure, and the upper enclosure section and the shallow foundation pit non-common enclosure structure jointly form a first foundation pit located above the common foundation pit enclosure structure in an enclosure mode. The lower enclosure section and the common foundation pit enclosure structure jointly form a second foundation pit in an enclosure mode, one end of the connecting structure is connected with the shallow foundation pit bottom plate, and the other end of the connecting structure is connected with the common foundation pit enclosure structure. The rigidity of the common foundation pit support main body structure can be effectively reduced, the stratum reinforcement measure on the soil facing side of the common foundation pit support main body structure is omitted, and the manufacturing cost is saved; by means of the connecting structure, construction safety can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pits, in particular to an adjacent foundation pit structure with unequal depths applicable to soft soil areas. Background Technique

[0002] With the continuous development of urban construction, it is quite common to construct deep and large foundation pits in soft soil areas. Sometimes, due to engineering needs, it is necessary to construct foundation pits with unequal depths at adjacent positions, or there are two parts with different depths in the same foundation pit. There are mainly two previous construction methods for adjacent foundation pits with unequal depths. One is to separate the two foundation pits, respectively design independent retaining structures and stagger the construction, and then connect the two main structures after the main structure construction in the two foundation pits is completed. This method increases the construction period on the one hand, and on the other hand, it is necessary to chisel the retaining structure at the connection part when connecting the two main structures after construction, which is more troublesome in construction and has certain risks. The other is to adopt the synchronous construction method. However, in this case, the stiffness of the common half retaining structure is often designed to be very large, and a large amount of ground reinforcement treatment is required on the soil-facing side of the common half retaining structure to ensure the safety of the foundation pit.

[0003] In view of this, it is necessary to propose an adjacent foundation pit structure with unequal depths applicable to soft soil areas to solve or at least alleviate the above defects. Content of the Utility Model

[0004] The main purpose of the utility model is to provide an adjacent foundation pit structure with unequal depths applicable to soft soil areas to solve the technical problems of troublesome construction and high project cost existing in the adjacent foundation pit structure with unequal depths in the prior art.

[0005] To achieve the above purpose, the utility model provides an adjacent foundation pit structure with unequal depths applicable to soft soil areas, which includes a non-common retaining structure for the deep foundation pit, a non-common retaining structure for the shallow foundation pit, a common foundation pit retaining structure, a shallow foundation pit bottom plate, and a connection structure; wherein,

[0006] The height of the common foundation pit retaining structure matches the height of the shallow foundation pit bottom plate;

[0007] The non-common retaining structure for the deep foundation pit includes an upper retaining section located above the common foundation pit retaining structure and a lower retaining section located below the common foundation pit retaining structure. The upper retaining section and the non-common retaining structure for the shallow foundation pit jointly enclose a first foundation pit located above the common foundation pit retaining structure, and the lower retaining section and the common foundation pit retaining structure jointly enclose a second foundation pit;

[0008] One end of the connection structure is connected to the shallow foundation pit bottom plate, and the other end of the connection structure is connected to the common foundation pit retaining structure.

[0009] Preferably, the shared foundation pit retaining structure includes a shared foundation pit retaining main structure and a capping beam provided at the top of the shared foundation pit retaining main structure, and one end of the connecting structure is connected to the capping beam.

[0010] Preferably, the connecting structure is in the shape of an inverted corbel. The top surface of the connecting structure is connected to the bottom surface of the shallow foundation pit floor, and the end surface of the connecting structure is connected to the outer wall surface of the capping beam.

[0011] Preferably, the connecting structure and the shallow foundation pit floor are integrally cast.

[0012] Preferably, longitudinal main reinforcement bars are arranged inside the shared foundation pit retaining main structure, and the longitudinal main reinforcement bars extend upward beyond the top of the capping beam.

[0013] Preferably, a steel bar coupler is reserved at one end of the shallow foundation pit floor close to the capping beam, and the steel bar coupler extends from the inside of the connecting structure in the direction towards the capping beam and outside the shallow foundation pit floor.

[0014] Preferably, the non - shared retaining structure of the deep foundation pit, the non - shared retaining structure of the shallow foundation pit, and the shared foundation pit retaining main structure are all diaphragm walls.

[0015] Preferably, the thickness of the diaphragm wall is set between 0.8 m and 1.2 m.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides an unequal - depth adjacent foundation pit structure applicable to soft soil areas, including a non - shared retaining structure of a deep foundation pit, a non - shared retaining structure of a shallow foundation pit, a shared foundation pit retaining structure, a shallow foundation pit floor, and a connecting structure. The solution of this application is particularly applicable to soft soil areas. In such areas, due to the low soil bearing capacity and large deformation, the requirements for foundation pit excavation and retaining structures are relatively high. Using the structure of this application, it is not necessary to construct the deep foundation pit and the shallow foundation pit separately. Instead, they can be constructed in a synchronous construction method, which can greatly improve the construction efficiency and reduce the project cost. The shallow foundation pit floor and the shared foundation pit retaining structure are connected through the connecting structure. The shallow foundation pit floor provides a lateral support reaction force for the shared foundation pit retaining structure, and the shallow foundation pit floor and the connecting structure provide horizontal support stiffness at the shared foundation pit retaining structure, thereby effectively reducing the stiffness of the shared foundation pit retaining structure itself, canceling the ground reinforcement measures on the soil - facing side of the shared foundation pit retaining structure, saving the construction cost, and ensuring construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 Schematic diagram of the overall structure in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the combined structure of the overall structure and the main structure in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the connection of the connection structure, the common foundation pit retaining structure, and the shallow foundation pit floor in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the common foundation pit retaining main structure in an embodiment of the present invention.

[0023] The realization of the object, functional features, and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

[0024] Explanation of the reference numerals in the drawings:

[0025] 10. Non - common retaining structure of deep foundation pit; 110. Upper retaining section; 120. Lower retaining section; 20. Common foundation pit retaining structure; 210. Common foundation pit retaining main structure; 211. Longitudinal main reinforcement; 220. Capping beam; 30. Shallow foundation pit floor; 310. Steel bar coupler; 40. Connection structure; 50. First foundation pit; 60. Second foundation pit; 70. Deep foundation pit floor; 80. Main structure. Detailed implementation manners

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as described in the attached drawings). If this specific posture changes, then the directional indication also changes accordingly.

[0029] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0030] Please refer to the attached Figures 1 to 4 , a structure of unequal-depth adjacent foundation pits applicable to soft soil areas in an embodiment provided by the present utility model includes a non-shared retaining structure 10 for the deep foundation pit, a non-shared retaining structure for the shallow foundation pit (not shown in the figure), a shared foundation pit retaining structure 20, a shallow foundation pit bottom slab 30, and a connecting structure 40; wherein, the height of the shared foundation pit retaining structure 20 matches the height of the shallow foundation pit bottom slab 30; as Figure 1 shown, the top of the shared foundation pit retaining structure 20 and the bottom of the shallow foundation pit bottom slab 30 are basically at the same level.

[0031] As Figure 2 shown, the non-shared retaining structure 10 for the deep foundation pit includes an upper retaining section 110 located above the shared foundation pit retaining structure 20 and a lower retaining section 120 located below the shared foundation pit retaining structure 20. The upper retaining section 110 and the non-shared retaining structure for the shallow foundation pit jointly enclose a first foundation pit 50 located above the shared foundation pit retaining structure 20. The lower retaining section 120 and the shared foundation pit retaining structure 20 jointly enclose a second foundation pit 60; one end of the connecting structure 40 is connected to the shallow foundation pit bottom slab 30, and the other end of the connecting structure 40 is connected to the shared foundation pit retaining structure 20.

[0032] The solution of this application is particularly applicable to soft soil areas. In such areas, due to the low soil bearing capacity and large deformation, higher requirements are imposed on the foundation pit excavation and retaining structure. By using the structure of this application, it is not necessary to construct deep foundation pits and shallow foundation pits separately. Instead, they can be constructed in a synchronous manner, which can greatly improve the construction efficiency and reduce the project cost. The shallow foundation pit bottom plate 30 and the common foundation pit retaining structure 20 are connected through the connecting structure 40. The shallow foundation pit bottom plate 30 provides lateral support reaction force for the common foundation pit retaining structure 20, and the shallow foundation pit bottom plate 30 and the connecting structure 40 provide horizontal support stiffness at the common foundation pit retaining structure 20, thereby effectively reducing the stiffness of the common foundation pit retaining structure 20 itself and canceling the stratum reinforcement measures on the soil-facing side of the common foundation pit retaining structure 20.

[0033] As a preferred embodiment, the common foundation pit retaining structure 20 includes a common foundation pit retaining main structure 210 and a capping beam 220 provided at the top of the common foundation pit retaining main structure 210, and one end of the connecting structure 40 is connected to the capping beam 220. The setting of the capping beam 220 can enhance the overall stiffness and stability of the common foundation pit retaining structure 20.

[0034] As a preferred embodiment, the connecting structure 40 is in the shape of an inverted corbel. The top surface of the connecting structure 40 is connected to the bottom surface of the shallow foundation pit bottom plate 30, and the end surface of the connecting structure 40 is connected to the outer wall surface of the capping beam 220.

[0035] Specifically, the inverted corbel shape of the connecting structure 40 increases the contact area with the shallow foundation pit bottom plate 30 and the capping beam 220, thereby improving the connection strength and stability. This structure can more effectively transfer and disperse the lateral earth pressure from the foundation pit side wall and prevent damage at the connection. The inverted corbel structure can form a reasonable stress distribution at the connection and reduce stress concentration.

[0036] Furthermore, the connecting structure 40 and the shallow foundation pit bottom plate 30 are cast integrally. Casting integrally improves the overall strength of the structure and enhances the anti-deformation and anti-destruction capabilities.

[0037] As a preferred embodiment, longitudinal main reinforcement bars 211 are arranged inside the common foundation pit retaining main structure 210, and the longitudinal main reinforcement bars 211 extend upward beyond the top of the capping beam 220. Specifically, the longitudinal main reinforcement bars 211 extending beyond the top of the capping beam 220 provide a connection foundation for the subsequent connection with the main structure 80. The extended longitudinal main reinforcement bars 211 can serve as connection points, facilitating welding or tying connections with other components.

[0038] As a preferred embodiment, as Figure 2As shown in FIGS. 2 or 3, a steel bar connector 310 is reserved at one end of the shallow foundation pit bottom plate 30 close to the crown beam 220, and the steel bar connector 310 extends from the inside of the connection structure 40 to the outside of the shallow foundation pit bottom plate 30 in the direction towards the crown beam 220.

[0039] Specifically, a steel bar connector 310 is reserved at one end of the shallow foundation pit bottom plate 30 close to the crown beam 220, making the connection between the connection structure 40 and the crown beam 220 more convenient. During the construction process, the reserved steel bar connector 310 can be used for connection, thus improving the construction efficiency. The steel bar connector 310 and the main structure 80 constructed later are connected into a whole, which can improve the overall structural strength of the foundation pit structure.

[0040] Furthermore, the non - shared retaining structures 10 of the deep foundation pit, the non - shared retaining structures of the shallow foundation pit, and the shared foundation pit retaining main structure 210 are all diaphragm walls. Specifically, the diaphragm wall has a large stiffness, can effectively resist the lateral earth pressure and groundwater pressure generated during the foundation pit excavation process, reduce the foundation pit deformation and displacement, ensure the overall stability and safety of the foundation pit project, and has good anti - seepage performance.

[0041] As a preferred example, the thickness of the diaphragm wall is set between 0.8 m and 1.2 m. It can be understood that in other embodiments, the thickness of the diaphragm wall can also be set according to actual needs.

[0042] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An adjacent foundation pit structure with unequal depths applicable to soft soil areas, characterized in that, It includes a non - shared retaining structure for deep foundation pit, a non - shared retaining structure for shallow foundation pit, a shared retaining structure for foundation pit, a shallow foundation pit bottom slab, and a connecting structure; wherein: The height of the shared retaining structure for foundation pit matches the height of the shallow foundation pit bottom slab; The non - shared retaining structure for deep foundation pit includes an upper retaining section above the shared retaining structure for foundation pit and a lower retaining section below the shared retaining structure for foundation pit. The upper retaining section and the non - shared retaining structure for shallow foundation pit jointly enclose a first foundation pit above the shared retaining structure for foundation pit, and the lower retaining section and the shared retaining structure for foundation pit jointly enclose a second foundation pit; One end of the connecting structure is connected to the shallow foundation pit bottom slab, and the other end of the connecting structure is connected to the shared retaining structure for foundation pit.

2. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to claim 1, wherein The shared retaining structure for foundation pit includes a shared retaining main body structure and a capping beam provided at the top of the shared retaining main body structure. One end of the connecting structure is connected to the capping beam.

3. The adjacent foundation pits structure with unequal depths applicable to soft soil areas according to claim 2, characterized in that, The connecting structure is in the shape of an inverted corbel. The top surface of the connecting structure is connected to the bottom surface of the shallow foundation pit bottom slab, and the end surface of the connecting structure is connected to the outer wall surface of the capping beam.

4. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to claim 3, wherein, The connecting structure and the shallow foundation pit bottom slab are cast integrally.

5. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to claim 2, wherein, Longitudinal main reinforcement bars are arranged inside the shared retaining main body structure for foundation pit, and the longitudinal main reinforcement bars extend upward beyond the top of the capping beam.

6. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to claim 2, characterized in that, A steel bar coupler is reserved at one end of the shallow foundation pit bottom slab close to the capping beam, and the steel bar coupler extends from inside the connecting structure in the direction towards the capping beam to outside the shallow foundation pit bottom slab.

7. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to any one of claims 2-6, characterized in that The non - shared retaining structure for deep foundation pit, the non - shared retaining structure for shallow foundation pit, and the shared retaining main body structure for foundation pit are all diaphragm walls.

8. The unequal-depth adjacent foundation pit structure applicable to soft soil areas according to claim 7, characterized in that, The thickness of the diaphragm wall is set between 0.8m and 1.2m.

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