Round foundation pit structure and system

Abstract

The utility model discloses a circular foundation pit structure and system, and relates to the technical field of foundation pit construction, the circular foundation pit structure comprises an underground diaphragm wall and multiple layers of linings, the underground diaphragm wall is cylindrical and extends to the ground from the underground, the multiple layers of linings are arranged on the surface of the underground diaphragm wall layer by layer from top to bottom in the circumferential direction, and the multiple layers of linings are arranged on the surface of the underground diaphragm wall. And the supporting plates are connected with the underground diaphragm wall to form an integral supporting structure. According to the circular foundation pit structure, the underground diaphragm wall in the main body structure serves as a supporting structure, the lining fixed to the surface of the underground diaphragm wall serves as a foundation pit support, an inner support does not need to be arranged in the middle of the circular foundation pit, use cost and construction difficulty are reduced, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a circular foundation pit structure and system. Background Art

[0002] As an important load-bearing structure of a suspension bridge, the gravity anchor foundation of a suspension bridge is composed of an underground continuous wall, a cap beam, an inner lining, a bottom plate, a core fill, a compartment and a top plate. The anchor foundation construction is carried out after the construction of the underground continuous wall and the cap beam is completed. The foundation pit is excavated by the reverse method. A layer of soil is excavated to construct a layer of inner lining, and then the bottom plate, core fill, compartment and top plate are constructed. The reverse method is to use the underground structure of the main project as the foundation pit support structure during excavation, and adopt a top-down design and construction method for the underground structure. First, the underground continuous wall or other supporting structure is constructed along the axis of the building's basement or around it. At the same time, intermediate support piles and support columns are cast or driven at relevant locations inside the building as a support for the deadweight of the upper structure and construction loads before the bottom plate is sealed during construction. Then, the beam and slab floor structure of the first ground layer is constructed as a support with great rigidity for the underground continuous wall. Subsequently, the earth is excavated downward layer by layer and each layer of underground structure is cast until the bottom plate is sealed.

[0003] However, when the reverse construction method is used for the construction of ultra-deep foundation pits, it is necessary to temporarily add supports in the ultra-deep foundation pits, which increases the amount of work and the difficulty of construction. Utility Model Content

[0004] The embodiment of the utility model provides a circular foundation pit structure and system to solve the technical problem that when the existing technology in the related art adopts the reverse construction method to construct an ultra-deep foundation pit, it is necessary to temporarily add supports in the ultra-deep foundation pit, which increases the amount of work and increases the difficulty of construction.

[0005] In a first aspect, a circular foundation pit structure is provided, comprising:

[0006] A ground-connected wall, the ground-connected wall is cylindrical and extends from the ground to the ground;

[0007] A multi-layer lining is provided on the surface of the ground-connected wall layer by layer from top to bottom along the circumferential direction, and is connected with the ground-connected wall to form an integral supporting structure.

[0008] In some embodiments, the ground-connected wall comprises:

[0009] A plurality of I-stage trough segments, wherein the plurality of I-stage trough segments are arc-shaped wall segments, and each of the I-stage trough segments is provided with three walls, and the three walls are engaged with each other in the arc direction;

[0010] There are multiple phase II trough segments, and the multiple phase II trough segments are also arc-shaped wall segments. Each phase II trough segment is provided with a wall, and one phase II trough segment and one phase I trough segment are alternately arranged, and each phase II trough segment is fixedly connected to each phase I trough segment.

[0011] In some embodiments, the overlapping length of two adjacent walls of the phase I trough section is 75 cm to 75.9 cm, and the overlapping length of each phase I trough section and each phase II trough section is 24 cm to 24.9 cm.

[0012] In some embodiments, the multi-layer liner includes a plurality of annular segments with different thicknesses from top to bottom.

[0013] In some embodiments, a plurality of embedded parts are provided inside the ground-connected wall at preset intervals, and the multiple layers of the lining are fixedly connected to the surface of the ground-connected wall through the plurality of embedded parts.

[0014] In some embodiments, each of the embedded parts includes:

[0015] Pre-embedded steel bars, the connecting steel bars of the lining are fixedly connected to the pre-embedded steel bars;

[0016] A sleeve connector is provided between the pre-embedded steel bars and the connecting steel bars of the lining, and is used to fix the pre-embedded steel bars and the connecting steel bars of the lining.

[0017] In some embodiments, the circular foundation pit structure further comprises:

[0018] A plurality of cap beams are arranged at intervals on the top of the ground connection wall along a circumferential direction and are used to fix the ground connection wall.

[0019] In some embodiments, the circular foundation pit structure further comprises:

[0020] A plurality of downdraft pipe wells are arranged at intervals along the circumferential direction inside the ground-connected wall for draining groundwater.

[0021] In a second aspect, a circular foundation pit system is provided, comprising the aforementioned circular foundation pit structure.

[0022] The beneficial effects brought by the technical solution provided by the utility model include:

[0023] The embodiment of the utility model provides a circular foundation pit structure and system, the circular foundation pit structure includes a ground-connected wall and a multi-layer lining, the ground-connected wall is cylindrical and extends from the ground to the ground, and the multi-layer lining is arranged on the surface of the ground-connected wall layer by layer from top to bottom along the circumferential direction, and connected with the ground-connected wall to form an integral support structure. The circular foundation pit structure of the utility model uses the ground-connected wall in the main structure as a supporting structure, and uses the lining fixed to the surface of the ground-connected wall as a foundation pit support, without the need to set an internal support in the middle of the circular foundation pit, thereby reducing the use cost and construction difficulty and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of a circular foundation pit structure provided by an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of a ground-connected wall provided in an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the structure of the embedded parts provided in the embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the structure of a downdraft well provided in an embodiment of the utility model;

[0029] Reference numerals:

[0030] 1. Ground-connected wall; 11. Phase I trough section; 12. Phase II trough section; 13. Embedded parts; 131. Embedded steel bars; 132. Sleeve connector;

[0031] 2. Lining; 21. Connecting steel bars;

[0032] 3. Cap beam;

[0033] 4. Precipitation pipe well. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The embodiment of the utility model provides a circular foundation pit structure and system, which can solve the technical problem that when the existing technology in the related art adopts the reverse construction method to construct an ultra-deep foundation pit, it is necessary to temporarily add supports in the ultra-deep foundation pit, which increases the amount of work and increases the difficulty of construction.

[0036] Figure 1 A circular foundation pit structure is provided in an embodiment of the utility model, comprising: a ground-connected wall 1 and a multi-layer lining 2. The ground-connected wall 1 is cylindrical and extends from the ground to the ground. The multi-layer lining 2 is arranged on the surface of the ground-connected wall 1 layer by layer from top to bottom along the circumferential direction, and is connected to the ground-connected wall 1 to form an overall supporting structure.

[0037] The circular foundation pit structure of the embodiment of the utility model is provided with a ground-connected wall and a multi-layer lining. The ground-connected wall is cylindrical and extends from the ground to the ground. The multi-layer lining is arranged on the surface of the ground-connected wall layer by layer from top to bottom along the circumferential direction, and is connected with the ground-connected wall to form an overall supporting structure. By utilizing the ground-connected wall in the main structure as a supporting structure and the lining fixed to the surface of the ground-connected wall as a foundation pit support, there is no need to set an internal support in the middle of the circular foundation pit, which reduces the use cost and construction difficulty and improves the construction efficiency.

[0038] As an optional implementation, in a utility model embodiment, see Figure 2As shown, the ground-connected wall 1 comprises: a plurality of phase I slot segments 11 and a plurality of phase II slot segments 12, wherein the plurality of phase I slot segments 11 are arc-shaped wall segments, each of the phase I slot segments 11 is provided with three walls, and the three walls are engaged with each other in the arc direction, and the plurality of phase II slot segments 12 are also arc-shaped wall segments, each of the phase II slot segments 12 is provided with a wall, and one phase II slot segment 12 is alternately arranged with one phase I slot segment 11, and each phase II slot segment 12 is fixed with each phase I slot segment 11. The I-phase trough segment 11 is connected and fixed with three walls through three milled grooves. The length of one wall of each I-phase trough segment 11 is 2.8m. The total length of the I-phase trough segment 11 is 6.885m. Each I-phase trough segment 11 is engaged with each II-phase trough segment 12 by 0.249m. This structure is used to alternately connect multiple I-phase trough segments 11 with multiple II-phase trough segments 12 to form a cylindrical ground-connected wall 1, so that the ground-connected wall 1 serves as a supporting structure in the main structure.

[0039] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, the overlapping length of two adjacent walls of the phase I trough segment 11 is 75cm to 75.9cm, and the overlapping length of each phase I trough segment 11 and each phase II trough segment 12 is 24cm to 24.9cm. Each phase I trough segment 11 and each phase II trough segment 12 are arc-shaped and connected by milling joints, which gives full play to the circular arch effect, reduces the stress on the wall, saves construction materials, and reduces the cost of use.

[0040] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the multi-layer lining 2 includes multiple circular segments of different thicknesses from top to bottom. The thicknesses of the multi-layer lining 2 from top to bottom are 1.5m, 2.0m and 2.5m respectively. The linings 2 of different thicknesses extend to the ground layer by layer in a zigzag shape. The multi-layer lining 2 is distributed layer by layer on the ground-connected wall 1 from top to bottom, so that the layer-by-layer construction of the lining structure and the excavation of the soil in the middle of the ground-connected wall are carried out simultaneously, which shortens the construction time, provides construction space for the excavation of the soil in the middle of the ground-connected wall, and reduces the construction cost.

[0041] As an optional implementation, in a utility model embodiment, see Figure 3 As shown, a plurality of embedded parts 13 are provided inside the ground-connected wall 1 at preset intervals, and the multiple layers of the lining 2 are fixedly connected to the surface of the ground-connected wall 1 through the multiple embedded parts 13. Before the construction and casting of the multiple layers of the lining 2, the multiple embedded parts 13 are pre-installed inside the ground-connected wall 1. When the multiple layers of the lining 2 are constructed layer by layer, the multiple layers of the lining 2 are fixedly connected to the ground-connected wall 1 only through the multiple embedded parts 13, which simplifies the construction and improves the construction efficiency and quality.

[0042] As an optional implementation, in a utility model embodiment, see Figure 3 As shown, each of the embedded parts 13 includes: embedded steel bars 131 and sleeve connectors 132. The connecting steel bars 21 of the lining 2 are fixedly connected to the embedded steel bars 131. The sleeve connectors 132 are arranged between the embedded steel bars 131 and the connecting steel bars 21 of the lining 2, and are used to fix the embedded steel bars 131 and the connecting steel bars 21 of the lining 2. The embedded steel bars 131 and the connecting steel bars 21 of the lining 2 are connected by the sleeve connectors 132, so that the lining 2 and the ground-connected wall 1 are fixedly connected to form a whole. The connection method is simple and easy to operate.

[0043] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the circular foundation pit structure also includes: a plurality of cap beams 3, which are arranged at intervals along the circumferential direction on the top of the ground-connected wall 1 for fixing the ground-connected wall 1. The plurality of cap beams 3 connect the top of the ground-connected wall 1 into one, thereby strengthening the structural stability of the ground-connected wall 1 and enabling the ground-connected wall 1 to better play a supporting role.

[0044] As an optional implementation, in a utility model embodiment, see Figure 4 As shown, the circular foundation pit structure also includes: a plurality of drainage pipe wells 4, which are arranged at intervals along the circumferential direction inside the ground-connected wall 1 for draining groundwater. The drainage pipe wells 4 are drilled by an SPJ-200 drilling rig equipped with a Φ600mm three-wing drill bit, and the drilling hole diameter of the drainage pipe well 4 is Φ600mm. By using the drainage pipe wells 4, the groundwater at the bottom of the foundation pit can be quickly drained, thereby improving drainage efficiency, reducing the risk of seepage and leakage during construction, and reducing construction difficulty.

[0045] The embodiment of the utility model also provides a circular foundation pit system, including the aforementioned circular foundation pit structure, wherein the circular foundation pit structure includes a ground-connected wall 1 and a multi-layer lining 2, wherein the ground-connected wall 1 is cylindrical and extends from the ground to the ground, and the multi-layer lining 2 is arranged on the surface of the ground-connected wall 1 layer by layer from top to bottom along the circumferential direction, and is connected to the ground-connected wall 1 to form an overall supporting structure.

[0046] The circular foundation pit system of the embodiment of the utility model has a circular foundation pit structure with a ground-connected wall and a multi-layer lining. The ground-connected wall is cylindrical and extends from the ground to the ground. The multi-layer lining is arranged on the surface of the ground-connected wall layer by layer from top to bottom along the circumferential direction and is connected with the ground-connected wall to form an overall supporting structure. By utilizing the ground-connected wall in the main structure as a supporting structure and the lining fixed to the surface of the ground-connected wall as a foundation pit support, there is no need to set an internal support in the middle of the circular foundation pit, which reduces the use cost and construction difficulty and improves the construction efficiency.

[0047] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, the ground-connected wall 1 comprises: a plurality of phase I slot segments 11 and a plurality of phase II slot segments 12, wherein the plurality of phase I slot segments 11 are arc-shaped wall segments, each of the phase I slot segments 11 is provided with three walls, and the three walls are engaged with each other in the arc direction, and the plurality of phase II slot segments 12 are also arc-shaped wall segments, each of the phase II slot segments 12 is provided with a wall, and one phase II slot segment 12 is alternately arranged with one phase I slot segment 11, and each phase II slot segment 12 is fixed with each phase I slot segment 11. The I-phase trough segment 11 is connected and fixed with three walls through three milled grooves. The length of one wall of each I-phase trough segment 11 is 2.8m. The total length of the I-phase trough segment 11 is 6.885m. Each I-phase trough segment 11 is engaged with each II-phase trough segment 12 by 0.249m. This structure is used to alternately connect multiple I-phase trough segments 11 with multiple II-phase trough segments 12 to form a cylindrical ground-connected wall 1, so that the ground-connected wall 1 serves as a supporting structure in the main structure.

[0048] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, the overlapping length of two adjacent walls of the phase I trough segment 11 is 75cm to 75.9cm, and the overlapping length of each phase I trough segment 11 and each phase II trough segment 12 is 24cm to 24.9cm. Each phase I trough segment 11 and each phase II trough segment 12 are arc-shaped and connected by milling joints, which gives full play to the circular arch effect, reduces the stress on the wall, saves construction materials, and reduces the cost of use.

[0049] As an optional implementation, in a utility model embodiment, see Figure 1As shown, the multi-layer lining 2 includes multiple circular segments of different thicknesses from top to bottom. The thicknesses of the multi-layer lining 2 from top to bottom are 1.5m, 2.0m and 2.5m respectively. The linings 2 of different thicknesses extend to the ground layer by layer in a zigzag shape. The multi-layer lining 2 is distributed layer by layer on the ground-connected wall 1 from top to bottom, so that the layer-by-layer construction of the lining structure and the excavation of the soil in the middle of the ground-connected wall are carried out simultaneously, which shortens the construction time, provides construction space for the excavation of the soil in the middle of the ground-connected wall, and reduces the construction cost.

[0050] As an optional implementation, in a utility model embodiment, see Figure 3 As shown, a plurality of embedded parts 13 are provided inside the ground-connected wall 1 at preset intervals, and the multiple layers of the lining 2 are fixedly connected to the surface of the ground-connected wall 1 through the multiple embedded parts 13. Before the construction and casting of the multiple layers of the lining 2, the multiple embedded parts 13 are pre-installed inside the ground-connected wall 1. When the multiple layers of the lining 2 are constructed layer by layer, the multiple layers of the lining 2 are fixedly connected to the ground-connected wall 1 only through the multiple embedded parts 13, which simplifies the construction and improves the construction efficiency and quality.

[0051] As an optional implementation, in a utility model embodiment, see Figure 3 As shown, each of the embedded parts 13 includes: embedded steel bars 131 and sleeve connectors 132. The connecting steel bars 21 of the lining 2 are fixedly connected to the embedded steel bars 131. The sleeve connectors 132 are arranged between the embedded steel bars 131 and the connecting steel bars 21 of the lining 2, and are used to fix the embedded steel bars 131 and the connecting steel bars 21 of the lining 2. The embedded steel bars 131 and the connecting steel bars 21 of the lining 2 are connected by the sleeve connectors 132, so that the lining 2 and the ground-connected wall 1 are fixedly connected to form a whole. The connection method is simple and easy to operate.

[0052] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the circular foundation pit structure also includes: a plurality of cap beams 3, which are arranged at intervals along the circumferential direction on the top of the ground-connected wall 1 for fixing the ground-connected wall 1. The plurality of cap beams 3 connect the top of the ground-connected wall 1 into one, thereby strengthening the structural stability of the ground-connected wall 1 and enabling the ground-connected wall 1 to better play a supporting role.

[0053] As an optional implementation, in a utility model embodiment, see Figure 4As shown, the circular foundation pit structure also includes: a plurality of drainage pipe wells 4, which are arranged at intervals along the circumferential direction inside the ground-connected wall 1 for draining groundwater. The drainage pipe wells 4 are drilled by an SPJ-200 drilling rig equipped with a Φ600mm three-wing drill bit, and the drilling hole diameter of the drainage pipe well 4 is Φ600mm. By using the drainage pipe wells 4, the groundwater at the bottom of the foundation pit can be quickly drained, thereby improving drainage efficiency, reducing the risk of seepage and leakage during construction, and reducing construction difficulty.

[0054] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0055] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A circular foundation pit structure, characterized in that: include: A ground-connected wall (1), the ground-connected wall (1) is cylindrical and extends from the ground to the ground; A multi-layer lining (2), wherein the multi-layer lining (2) is arranged layer by layer on the surface of the ground-connected wall (1) from top to bottom along the circumferential direction, and is connected to the ground-connected wall (1) to form an integral supporting structure.

2. The circular foundation pit structure according to claim 1, characterized in that: The ground-connected wall (1) comprises: A plurality of I-stage trough sections (11), wherein the plurality of I-stage trough sections (11) are arc-shaped wall sections, and each of the I-stage trough sections (11) is provided with three walls, and the three walls are engaged with each other in the arc direction; A plurality of phase II trough sections (12), wherein the plurality of phase II trough sections (12) are also arc-shaped wall sections, each phase II trough section (12) is provided with a wall, and a phase II trough section (12) and a phase I trough section (11) are alternately arranged, and each phase II trough section (12) is fixedly connected to each phase I trough section (11).

3. The circular foundation pit structure according to claim 2, characterized in that: The overlapping length of two adjacent walls of the phase I trough section (11) is 75 cm to 75.9 cm, and the overlapping length of each phase I trough section (11) and each phase II trough section (12) is 24 cm to 24.9 cm.

4. The circular foundation pit structure according to claim 1, characterized in that: The multi-layer lining (2) comprises a plurality of circular ring segments with different thicknesses from top to bottom.

5. The circular foundation pit structure according to claim 1, characterized in that: A plurality of embedded parts (13) are arranged inside the ground-connected wall (1) at preset intervals, and the multiple layers of the inner lining (2) are fixedly connected to the surface of the ground-connected wall (1) via the plurality of embedded parts (13).

6. The circular foundation pit structure according to claim 5, characterized in that: Each of the embedded parts (13) comprises: Pre-buried steel bars (131), the connecting steel bars (21) of the lining (2) being fixedly connected to the pre-buried steel bars (131); A sleeve connector (132) is provided between the embedded steel bars (131) and the connecting steel bars (21) of the inner lining (2) and is used to fix the embedded steel bars (131) and the connecting steel bars (21) of the inner lining (2).

7. The circular foundation pit structure according to claim 1, characterized in that: Also includes: A plurality of cap beams (3) are arranged at intervals on the top of the ground-connected wall (1) along a circumferential direction and are used to fix the ground-connected wall (1).

8. The circular foundation pit structure according to claim 1, characterized in that: Also includes: A plurality of downdraft pipe wells (4) are arranged at intervals along the circumferential direction inside the ground-connected wall (1) for draining groundwater.

9. A circular foundation pit system, characterized in that: It comprises the circular foundation pit structure as described in any one of claims 1-8.

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