Supporting structure for foundation pit

Abstract

The invention relates to the technical field of constructional engineering, and discloses a supporting structure for a foundation pit, which comprises a plane supporting assembly and a supporting assembly, the vertical supporting assembly comprises two vertical supporting frames, the two vertical supporting frames are arranged on the plane supporting assembly, each vertical supporting frame comprises an upper chord frame body and a plurality of first supporting rods, the first supporting rods are arranged at intervals in the first direction, and the two ends of each first supporting rod are connected with the upper chord frame body and the plane supporting assembly respectively; the first supporting rod comprises a rod body and a first jack which are arranged and connected in the third direction, the upper end of the rod body is connected with the upper chord frame body, the lower end of the first jack is connected with the plane supporting assembly, the two ends of the upper chord frame body are provided with pre-buried parts respectively, and the pre-buried parts are pre-buried in the crown beam. According to the supporting structure for the foundation pit, a large number of temporary stand columns can be prevented from being arranged in the construction process, obstacles in foundation pit construction are reduced, the construction time is shortened, and the earthwork digging and transporting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a supporting structure for a foundation pit. Background Art

[0002] As a green and low-carbon foundation pit support method, steel support has the advantages of fast installation and disassembly, prestressing, recyclability, and no construction waste. It is widely used in foundation pit support projects. With the implementation of the national "dual carbon" policy, the recycling and recycling of steel support structures have been fully promoted. However, there are some problems with traditional steel pipe supports in practical applications: first, the rigidity of a single steel pipe support is relatively small, which limits the applicable foundation pit size of the support, resulting in too dense support spacing, affecting the efficiency of earthwork excavation and transportation; second, the application and maintenance accuracy of prestressing of traditional supports is poor, and the control effect is not ideal.

[0003] To solve these problems, the existing steel composite support structure adopts multiple steel main rods, and forms a plane support by splicing cover plates or connecting webs, which significantly improves the stiffness in the plane, expands the support spacing, and increases the working surface of foundation pit excavation, thereby improving construction efficiency. However, the existing technology still has obvious shortcomings: on the one hand, the out-of-plane stiffness is small, and temporary columns and support beams are required, which not only increases the complexity of the support structure, but also becomes an obstacle to foundation pit excavation. The setting of temporary columns affects the construction progress of the main structure. In addition, in the support of deep and large foundation pits, it is necessary to increase the support strength by increasing the cross-section of steel or the number of temporary columns. These solutions may increase the deadweight, affect stability, or limit the construction conditions of the foundation pit. Summary of the invention

[0004] The purpose of the present invention is to provide a support structure for a foundation pit, which can effectively improve the support stiffness and avoid the need to set up a large number of temporary columns in the traditional steel composite support scheme, thereby reducing obstacles in the foundation pit construction, shortening the construction time and improving the earth excavation efficiency.

[0005] In order to achieve the above object, the present invention provides a support structure for a foundation pit, wherein both sides of the foundation pit in a first direction are provided with crown beams, and the support structure for the foundation pit comprises:

[0006] A planar support component, wherein two ends of the planar support component in a first direction are respectively connected to the crown beam;

[0007] A vertical support assembly, the vertical support assembly includes two vertical support frames, the two vertical support frames are respectively arranged at the two ends of the planar support assembly in the second direction, the vertical support frame includes an upper chord frame body and a plurality of first support rods, the plurality of first support rods are arranged at intervals along the first direction, the first support rod extends along a third direction, the two ends of the first support rod are respectively connected to the upper chord frame body and the planar support assembly, the first support rod includes a rod body and a first jack arranged and connected along the third direction, the upper end of the rod body is connected to the upper chord frame body, the lower end of the first jack is connected to the planar support assembly, the two ends of the upper chord frame body respectively have embedded parts, and the embedded parts are embedded in the crown beam;

[0008] The first direction, the second direction, and the third direction are perpendicular to each other.

[0009] Furthermore, the upper chord frame includes two first tie rods and multiple second tie rods, the embedded portion is arranged at one end of the first tie rod close to the crown beam, the other end of the first tie rod is connected to the upper end of the first support rod close to the crown beam, and the two ends of the second tie rod are respectively connected to the upper ends of two adjacent first support rods.

[0010] Furthermore, the length of the first support rod close to the middle of the foundation pit is greater than the length of the first support rod away from the middle of the foundation pit.

[0011] Furthermore, a second support rod is provided between two adjacent first support rods, and two ends of the second support rod are respectively connected to the upper end of the rod body of one of the first support rods and the lower end of the first jack of the other first support rod.

[0012] Furthermore, one of the first support rods is arranged at the center of the foundation pit, and a plurality of the second support rods are symmetrically arranged with the first support rod as a symmetry axis.

[0013] Further, the planar support assembly includes a first planar support frame and a first cover plate, the first cover plate is covered on the first planar support frame, the first planar support frame includes two first steel sections, a plurality of first webs and a plurality of second jacks, the two first steel sections are spaced apart along the second direction, the first steel section extends along the first direction, two ends of the first steel section are respectively connected to the two crown beams, the first webs are evenly spaced apart along the first direction, the first webs extend along the second direction, the two ends of the first webs are respectively connected to the two first steel sections, a plurality of second jacks are spaced apart between the two first steel sections along the first direction, the vertical support frames are arranged on the first steel sections one by one, the two ends of the first webs or the two ends of the second jacks are respectively facing the lower ends of the first support rods of the two vertical support frames.

[0014] Furthermore, the first planar support frame also includes a plurality of second webs arranged obliquely, the first web or the second jack is arranged between adjacent second webs, and the first end of the second web is connected to the second end of the second web adjacent thereto.

[0015] Further, the planar support assembly includes a second planar support frame and a second cover plate, the second cover plate is covered on the second planar support frame, the second planar support frame includes two second steel sections, at least one third steel section, a plurality of third webs and a plurality of third jacks, the two second steel sections are spaced apart along the second direction, the second steel section extends along the first direction, the two ends of the second steel section are respectively connected to the two crown beams, the third steel section is spaced apart between the two second steel sections, the third steel section extends along the first direction, the two ends of the third steel section are respectively connected to the two crown beams On, the third webs are evenly spaced along the first direction, the third webs extend along the second direction, the two ends of the third webs are respectively connected to two of the second steel sections, the third webs pass through the third steel sections and are welded to the third steel sections, a plurality of the third jacks are spaced between two of the second steel sections along the first direction, the third jacks pass through the third steel sections, the vertical support frames are arranged on the second steel sections in a one-to-one correspondence, the two ends of the third webs or the two ends of the third jacks are respectively opposite to the lower ends of the first support rods of the two vertical support frames.

[0016] Furthermore, the second planar support frame also includes a plurality of inclined fourth webs, the third webs or the third jacks are arranged between adjacent fourth webs, a plurality of the fourth webs pass through the second steel section and are welded to the second steel section, and the plurality of the fourth webs are parallel to each other.

[0017] Compared with the prior art, the supporting structure for foundation pit of the embodiment of the present invention has the following beneficial effects: the first support rod includes a rod body and a first jack connected and arranged along a third direction, the upper end of the rod body is connected to the upper chord frame, and the lower end of the first jack is connected to the plane support assembly. The adjustable prestress is applied by the first jack, and the stress condition of the supporting structure can be accurately adjusted according to the actual needs of the foundation pit construction, allowing the supporting force to be dynamically adjusted to ensure that the supporting structure is always in the optimal stress state, so that the entire supporting structure is not prone to excessive deformation under the load, thereby improving the safety and stability of the supporting structure; both ends of the upper chord frame have embedded parts, and the embedded parts are embedded in the crown beam, which simplifies the construction process of the supporting structure. In the traditional support scheme, additional connectors may be required to ensure the stable connection between each supporting structure and the crown beam, while the present invention is directly connected to the crown beam through the embedded part, and there is no need to construct the crown beam support part on site, which reduces the construction difficulty and time and improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a schematic diagram of the overall structure of a foundation pit support structure according to an embodiment of the present invention;

[0019] Figure 2 1 is a schematic structural diagram of a vertical support frame of a foundation pit support structure according to an embodiment of the present invention;

[0020] Figure 3 is a structural schematic diagram of a first plane support frame of a foundation pit support structure according to an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a second plane support frame of a foundation pit support structure according to an embodiment of the present invention;

[0022] In the figure, 1, crown beam;

[0023] 2. Plane support assembly; 201. first plane support frame; 2011. first steel; 2012. first web member; 2013. second jack; 2014. second web member; 202. second plane support frame; 2021. second steel; 2022. third steel; 2023. third web member; 2024. third jack; 2025. fourth web member;

[0024] 3. Vertical support assembly; 301. Vertical support frame; 3011. Upper chord frame; 30111. First tie rod; 30112. Second tie rod; 30113. Embedded part; 3012. First support rod; 30121. Rod body; 30122. First jack; 3013. Second support rod;

[0025] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal" and the like used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0028] In the description of the present invention, the terms "provided with", "set", "connected", and "placed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0030] The technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0031] like Figure 1-4 As shown, a supporting structure for a foundation pit according to an embodiment of the present invention, a crown beam 1 is provided on both sides of the foundation pit in a first direction X, and the supporting structure for the foundation pit comprises:

[0032] A planar support component 2, wherein two ends of the planar support component 2 in the first direction X are respectively connected to the crown beam 1;

[0033] The vertical support assembly 3 comprises two vertical support frames 301, the two vertical support frames 301 are respectively arranged at the two ends of the plane support assembly 2 in the second direction Y, the vertical support frame 301 comprises an upper chord frame 3011 and a plurality of first support rods 3012, the plurality of first support rods 3012 are arranged at intervals along the first direction X, the first support rods 3012 extend along the third direction Z, the two ends of the first support rods 3012 are respectively connected to the upper chord frame 3011 and the plane support assembly 2, the first support rod 3012 comprises a rod body 30121 and a first jack 30122 arranged and connected along the third direction Z, the upper end of the rod body 30121 is connected to the upper chord frame 3011, the lower end of the first jack 30122 is connected to the plane support assembly 2, the two ends of the upper chord frame 3011 respectively have embedded parts 30113, and the embedded parts 30113 are embedded in the crown beam 1;

[0034] The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0035] Based on the above technical solution, the first support rod 3012 includes a rod body 30121 and a first jack 30122 connected along a third direction Z, the upper end of the rod body 30121 is connected to the upper chord frame 3011, and the lower end of the first jack 30122 is connected to the planar support assembly 2. The adjustable prestress is applied by the first jack 30122, so that the stress condition of the support structure can be accurately adjusted according to the actual needs of the foundation pit construction, and the supporting force can be dynamically adjusted to ensure that the support structure is always in the optimal stress state, so that the entire support structure is not prone to excessive deformation under the action of load, thereby improving the safety and stability of the support structure; the two ends of the upper chord frame 3011 respectively have embedded parts 30113, and the embedded parts 30113 are embedded in the crown beam 1, which simplifies the construction process of the support structure. In traditional support schemes, additional connectors may be required to ensure a stable connection between each support structure and the crown beam 1. However, the present invention is directly connected to the crown beam 1 through the embedded part 30113, and does not require on-site construction of the crown beam 1 support parts, thereby reducing construction difficulty and time and improving construction efficiency.

[0036] Preferably, the upper chord frame 3011 includes two first tie rods 30111 and multiple second tie rods 30112, the embedded part 30113 is arranged at one end of the first tie rod 30111 close to the crown beam 1, the other end of the first tie rod 30111 is connected to the upper end of the first support rod 3012 close to the crown beam 1, and the two ends of the second tie rod 30112 are respectively connected to the upper ends of two adjacent first support rods 3012.

[0037] Specifically, the embedded part 30113 includes an embedded sleeve, the embedded sleeve has an internal thread, one end of the first pull rod 30111 has an external thread, the embedded sleeve is engaged with one end of the first pull rod 30111, and the embedded sleeve is embedded in the crown beam 1.

[0038] The threaded connection between the embedded sleeve and the first tie rod 30111 ensures the tightness of the connection between the two, and the meshing of the internal and external threads effectively prevents the connection parts from loosening or falling off, thereby enhancing the stability of the connection. Especially during the foundation pit construction process, the supporting structure is subjected to large external loads and vibrations, and the threaded connection can provide stronger vibration resistance, thereby ensuring the long-term stability of the supporting structure; the threaded connection between the embedded sleeve and the first tie rod 30111 makes the installation process easier, and the maintenance and adjustment of the supporting structure become more convenient, and local adjustments and reinforcements can be made without dismantling the entire supporting structure.

[0039] More preferably, the length of the first support rod 3012 close to the middle of the foundation pit is greater than the length of the first support rod 3012 away from the middle of the foundation pit.

[0040] From the middle of the foundation pit to both sides in the first direction X, the length of the first support rod 3012 gradually decreases, and the upper chord frame 3011 simulates an arch structure. When subjected to force, the load is mainly transferred through compression force, and the load is transferred to the embedded parts 30113 on both sides of the supporting structure. The load can be smoothly distributed along the upper chord frame 3011, reducing local stress concentration, and helping to disperse and reduce the concentration of bending moment and shear force. The first support rod 3012 can distribute the force more evenly, reducing the possibility of irreversible deformation of the supporting structure, thereby enhancing the overall stability of the supporting structure.

[0041] Preferably, a second support rod 3013 is provided between two adjacent first support rods 3012 , and two ends of the second support rod 3013 are respectively connected to the upper end of the rod body 30121 of one first support rod 3012 and the lower end of the first jack 30122 of the other first support rod 3012 .

[0042] The second support rod 3013 provides additional support between two adjacent first support rods 3012, which not only helps to evenly distribute the load, but also effectively improves the force transmission path. By connecting two adjacent first support rods 3012 through the second support rod 3013, the second support rod 3013 can reduce the pressure on a single first support rod 3012, thereby reducing the situation of excessive local load and improving the overall compressive resistance of the support structure.

[0043] More preferably, one of the first support rods 3012 is disposed at the center of the foundation pit, and a plurality of second support rods 3013 are symmetrically disposed with the first support rod 3012 as an axis of symmetry.

[0044] By setting the first support rod 3012 at the center of the foundation pit and setting a plurality of second support rods 3013 with the support rod as the symmetry axis, it is ensured that the support structure evenly distributes the load in the foundation pit, and the symmetrical setting can balance the force of the support structure, so that the load can be evenly transmitted along the symmetry axis, thereby avoiding the situation of excessive local force and avoiding excessive deformation or failure of a certain part of the structure due to uneven load. This makes the force of the entire support structure more balanced and improves the stability and safety of the structure.

[0045] Embodiment 1:

[0046] Preferably, the planar support assembly 2 includes a first planar support frame 201 and a first cover plate, the first cover plate is covered on the first planar support frame 201, the first planar support frame 201 includes two first steel sections 2011, a plurality of first webs 2012 and a plurality of second jacks 2013, the two first steel sections 2011 are arranged at intervals along the second direction Y, the first steel section 2011 extends along the first direction X, the two ends of the first steel section 2011 are respectively connected to the two crown beams 1, the first webs 2012 are evenly spaced along the first direction X. The first web member 2012 extends along the second direction Y, and the two ends of the first web member 2012 are respectively connected to the two first steel sections 2011, and a plurality of second jacks 2013 are arranged between the two first steel sections 2011 along the first direction X at intervals, and the vertical support frames 301 are arranged on the first steel sections 2011 one by one, and the two ends of the first web member 2012 or the two ends of the second jacks 2013 are respectively opposite to the lower ends of the first support rods 3012 of the two vertical support frames 301 (the first cover plate is not shown in the drawings of the specification).

[0047] Through the combination of two first steel sections 2011 and a plurality of first webs 2012, the first plane support frame 201 forms a frame structure with high rigidity, which can effectively withstand the pressure of the excavation equipment placed on the first plane support frame 201 during the foundation pit construction process. The plurality of first webs 2012 connecting the two first steel sections 2011 enhances the bearing capacity of the overall structure, ensuring that the first plane support frame 201 is evenly distributed when subjected to load, and there will be no local force concentration phenomenon; the plurality of second jacks 2013 are arranged at intervals along the first direction X so that the first plane support frame 201 can accurately adjust the applied prestress, and the second jacks 2013 can ensure that the first plane support frame 201 always maintains the best stress state at all positions, avoiding the support instability or uneven load that may occur during the foundation pit excavation process.

[0048] More preferably, the first planar support frame 201 further includes a plurality of second webs 2014 arranged obliquely, a first web 2012 or a second jack 2013 is arranged between adjacent second webs 2014, and a first end of a second web 2014 is connected to a second end of an adjacent second web 2014.

[0049] The inclined arrangement of the second web member 2014 can effectively resist pressure from different directions. When used in conjunction with the first web member 2012 or the second jack 2013, the bearing capacity and stability of the support frame in all directions are enhanced, especially in a compressed state, the stability of the structure can be greatly improved by transmitting oblique forces.

[0050] Embodiment 2:

[0051] Preferably, the planar support assembly 2 includes a second planar support frame 202 and a second cover plate, the second cover plate is covered on the second planar support frame 202, the second planar support frame 202 includes two second steel sections 2021, at least one third steel section 2022, a plurality of third webs 2023 and a plurality of third jacks 2024, the two second steel sections 2021 are arranged at intervals along the second direction Y, the second steel section 2021 extends along the first direction X, the two ends of the second steel section 2021 are respectively connected to the two crown beams 1, the third steel section 2022 is arranged at intervals between the two second steel sections 2021, the third steel section 2022 extends along the first direction X, the two ends of the third steel section 2022 are respectively connected to the two crown beams 1, the third web 202 The third web members 2023 are evenly spaced along the first direction X, the third web members 2023 extend along the second direction Y, the two ends of the third web members 2023 are respectively connected to the two second steel sections 2021, the third web members 2023 pass through the third steel sections 2022, and are welded to the third steel sections 2022, a plurality of third jacks 2024 are spaced between the two second steel sections 2021 along the first direction X, the third jacks 2024 pass through the third steel sections 2022, the vertical support frames 301 are correspondingly arranged on the second steel sections 2021, the two ends of the third web members 2023 or the two ends of the third jacks 2024 are respectively opposite to the lower ends of the first support rods 3012 of the two vertical support frames 301 (the second cover plates are not shown in the drawings of the specification).

[0052] The layout of the second steel 2021 works together with the third steel 2022 to ensure that the load can be efficiently distributed in the foundation pit support structure. The second steel 2021 extends along the first direction X of the support frame, providing the main support point of the structure. The third steel 2022 plays a complementary role in load distribution, especially in areas spanning larger spans. The third steel 2022 helps the second steel 2021 to better disperse and bear a large range of loads, avoiding excessive deformation of the support structure due to load concentration.

[0053] More preferably, the second planar support frame 202 also includes a plurality of inclined fourth web members 2025, a third web member 2023 or a third jack 2024 is provided between adjacent fourth web members 2025, the plurality of fourth web members 2025 pass through the second steel section 2021 and are welded to the second steel section 2021, and the plurality of fourth web members 2025 are parallel to each other.

[0054] The fourth web member 2025 is arranged obliquely to enhance the resistance of the supporting structure to lateral pressure. During the excavation of the foundation pit, the lateral pressure of the foundation pit soil is the force that the supporting structure must withstand. The inclined fourth web member 2025 can more effectively disperse the pressure and transfer it to other parts of the second plane support frame 202. The fourth web members 2025 parallel to each other coordinate with each other to enable the supporting structure to better disperse and withstand the lateral pressure, thereby improving the lateral force resistance of the supporting structure.

[0055] In summary, an embodiment of the present invention provides a support structure for a foundation pit, wherein the first support rod 3012 includes a rod body 30121 and a first jack 30122 connected and arranged along a third direction Z, the upper end of the rod body 30121 is connected to the upper chord frame 3011, and the lower end of the first jack 30122 is connected to the planar support assembly 2. Adjustable prestress is applied by the first jack 30122, so that the stress condition of the support structure can be accurately adjusted according to the actual needs of the foundation pit construction, and the supporting force can be dynamically adjusted to ensure that the support structure is always in the optimal stress state, so that the entire support structure is not prone to excessive deformation under the action of load, thereby improving the safety and stability of the support structure; both ends of the upper chord frame 3011 respectively have embedded parts 30113, and the embedded parts 30113 are embedded in the crown beam 1, which simplifies the construction process of the support structure. In traditional support schemes, additional connectors may be required to ensure a stable connection between each support structure and the crown beam 1. However, the present invention is directly connected to the crown beam 1 through the embedded part 30113, and does not require on-site construction of the crown beam 1 support parts, thereby reducing construction difficulty and time and improving construction efficiency.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A supporting structure for a foundation pit, wherein both sides of the foundation pit in a first direction (X) are provided with a cap beam (1), characterized in that: include: A planar support component (2), wherein two ends of the planar support component (2) in a first direction (X) are respectively connected to the crown beam (1); A vertical support assembly (3), the vertical support assembly (3) comprising two vertical support frames (301), the two vertical support frames (301) being respectively arranged at two ends of the planar support assembly (2) in the second direction (Y), the vertical support frame (301) comprising an upper chord frame body (3011) and a plurality of first support rods (3012), the plurality of first support rods (3012) being arranged at intervals along the first direction (X), the first support rods (3012) extending along a third direction (Z), the two ends of the first support rods (3012) being respectively connected On the upper chord frame (3011) and the plane support assembly (2), the first support rod (3012) comprises a rod body (30121) and a first jack (30122) arranged and connected along a third direction (Z), the upper end of the rod body (30121) is connected to the upper chord frame (3011), the lower end of the first jack (30122) is connected to the plane support assembly (2), and both ends of the upper chord frame (3011) are respectively provided with embedded parts (30113), and the embedded parts (30113) are embedded in the crown beam (1); The first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other.

2. The foundation pit support structure according to claim 1, characterized in that: The upper chord frame (3011) includes two first tie rods (30111) and a plurality of second tie rods (30112); the embedded portion (30113) is arranged at one end of the first tie rod (30111) close to the crown beam (1); the other end of the first tie rod (30111) is connected to the upper end of the first support rod (3012) close to the crown beam (1); and the two ends of the second tie rod (30112) are respectively connected to the upper ends of two adjacent first support rods (3012).

3. The foundation pit support structure according to claim 2, characterized in that: The length of the first support rod (3012) close to the middle of the foundation pit is greater than the length of the first support rod (3012) away from the middle of the foundation pit.

4. The foundation pit support structure according to claim 1, characterized in that: A second support rod (3013) is provided between two adjacent first support rods (3012), and two ends of the second support rod (3013) are respectively connected to the upper end of the rod body (30121) of one first support rod (3012) and the lower end of the first jack (30122) of another first support rod (3012).

5. The foundation pit support structure according to claim 4, characterized in that: One of the first support rods (3012) is arranged at the center of the foundation pit, and a plurality of the second support rods (3013) are symmetrically arranged with the first support rod (3012) as a symmetry axis.

6. The foundation pit support structure according to claim 1, characterized in that: The planar support assembly (2) comprises a first planar support frame (201) and a first cover plate, wherein the first cover plate is disposed on the first planar support frame (201), the first planar support frame (201) comprises two first steel sections (2011), a plurality of first web members (2012) and a plurality of second jacks (2013), the two first steel sections (2011) being arranged at intervals along a second direction (Y), the first steel sections (2011) extending along the first direction (X), the two ends of the first steel sections (2011) being respectively connected to the two crown beams (1), the first web members (2012) extending along the first direction (X), The first web members (2012) are evenly spaced along the first direction (X), the first web members (2012) extend along the second direction (Y), the two ends of the first web members (2012) are respectively connected to the two first steel sections (2011), a plurality of the second jacks (2013) are spaced along the first direction (X) between the two first steel sections (2011), the vertical support frames (301) are arranged on the first steel sections (2011) in a one-to-one correspondence, the two ends of the first web members (2012) or the two ends of the second jacks (2013) are respectively opposite to the lower ends of the first support rods (3012) of the two vertical support frames (301).

7. The foundation pit support structure according to claim 6, characterized in that: The first planar support frame (201) further comprises a plurality of second web members (2014) arranged obliquely, the first web member (2012) or the second jack (2013) being arranged between adjacent second web members (2014), and the first end of the second web member (2014) being connected to the second end of the second web member (2014) adjacent thereto.

8. The foundation pit support structure according to claim 1, characterized in that: The planar support assembly (2) comprises a second planar support frame (202) and a second cover plate, wherein the second cover plate is disposed on the second planar support frame (202), the second planar support frame (202) comprises two second steel sections (2021), at least one third steel section (2022), a plurality of third webs (2023) and a plurality of third jacks (2024), the two second steel sections (2021) being arranged at intervals along a second direction (Y), the second steel sections (2021) extending along the first direction (X), the two ends of the second steel sections (2021) being respectively connected to the two crown beams (1), the third steel sections (2022) being arranged at intervals between the two second steel sections (2021), the third steel sections (2022) extending along the first direction (X), the two ends of the third steel sections (2022) being respectively connected to the two crown beams (1), the third webs The third web members (2023) are evenly spaced along the first direction (X), the third web members (2023) extend along the second direction (Y), the two ends of the third web members (2023) are respectively connected to the two second steel sections (2021), the third web members (2023) pass through the third steel sections (2022) and are welded to the third steel sections (2022), a plurality of third jacks (2024) are spaced between the two second steel sections (2021) along the first direction (X), the third jacks (2024) pass through the third steel sections (2022), the vertical support frames (301) are arranged one by one on the second steel sections (2021), the two ends of the third web members (2023) or the two ends of the third jacks (2024) are respectively opposite to the lower ends of the first support rods (3012) of the two vertical support frames (301).

9. The foundation pit support structure according to claim 8, characterized in that: The second planar support frame (202) further comprises a plurality of fourth web members (2025) arranged obliquely, the third web member (2023) or the third jack (2024) being arranged between adjacent fourth web members (2025), the plurality of fourth web members (2025) passing through the third section steel (2022) and being welded to the second section steel (2021), and the plurality of fourth web members (2025) being parallel to each other.

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