A deep foundation pit assembled steel support frame structure

Abstract

The present invention relates to the technical field of foundation pit support, and specifically discloses a prefabricated steel support frame structure for a deep foundation pit, comprising lattice columns, a support mechanism, purlins, and steel beams. The lattice columns are arranged at intervals, and the support mechanism comprises an upper support column, a lower support column, and two sets of tensioning assemblies. The upper support column and the lower support column are respectively perpendicular to the lattice columns and installed in different holes of the lattice columns. The two sets of tensioning assemblies are symmetrically arranged on both sides of the lattice columns, and the upper and lower ends of the tensioning assemblies are respectively detachably connected to the upper support column and the lower support column. The upper support column and the lower support column are symmetrically provided with limit assemblies on both sides of the lattice column, and the limit assemblies are detachably connected to the lattice columns. The purlins are arranged on the side walls of the foundation pit, and the steel beams are erected on the upper support columns, and the ends of the steel beams are detachably connected to the purlins. The present invention simplifies the construction procedure, facilitates the disassembly of components, avoids damage to materials, is conducive to reuse, and reduces the investment cost of the project.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation pit support, and in particular relates to an assembled steel support frame structure for a deep foundation pit. Background Art

[0002] With the rapid development of urban construction, urban land is becoming increasingly scarce. With the increasing number of high-rise buildings and various large-scale underground facilities, underground space is being developed and utilized on a large scale, and the scale and depth are constantly increasing. The development and construction of these underground spaces and facilities first require large-scale deep foundation pit excavation. However, in urban areas with relatively dense buildings and roads, traffic pipelines are complex, construction sites are small, and construction conditions are poor. This places higher and more stringent requirements on the foundation pit support system.

[0003] After deep foundation pit excavation, to ensure construction safety and the stability of the surrounding environment, effective vertical retaining structures, such as reinforced concrete retaining wall piles or underground continuous walls, must be constructed to block lateral soil pressure. For deeper foundation pits, a horizontal support system is also required to balance and distribute the soil load to ensure the overall stability of the foundation pit. However, the traditional cast-in-place concrete structure support system, although technically mature, has environmental issues such as high cost, long construction period, non-reusability, difficulty in demolition, and the accompanying large amount of construction waste. This has caused a huge waste of resources and is not in line with the development trend of green and low-carbon development, nor with the development direction of building industrialization.

[0004] At present, the detachable and reusable prefabricated foundation pit support structure system has gradually replaced the original reinforced concrete support structure due to a series of advantages such as low cost, recyclable materials and fast construction speed, pointing out the development direction for the engineering construction industry.

[0005] In particular, the combined application of steel beams and lattice columns in prefabricated foundation pit support systems has become a hot topic in research and practice. Lattice columns play a key role in foundation pit support due to their strong bending resistance, material savings, lack of maintenance requirements, and short construction periods. Steel beams primarily support the perimeter purlins, which in turn require lattice columns for support. Traditionally, this approach involves extensive welding work when connecting the lattice columns to the steel beams. While welding ensures the strength of the connection between the steel beams and lattice columns, it also increases the difficulty of subsequent disassembly, consumes a significant amount of manpower, and can easily damage the steel beams, hindering their reuse. Another connection method involves installing multiple brackets on the lattice columns and placing joists on them to support the steel beams. However, installing multiple brackets on the lattice columns not only requires numerous screw holes in the lattice columns, increasing the workload, but also increases the load-bearing capacity of the lattice columns due to the brackets and joists. This can negatively impact the load-bearing performance of the lattice columns and hinder the disassembly and reuse of the steel beams.

[0006] Therefore, we propose a deep foundation pit assembled steel support frame structure to solve the above technical problems. Summary of the Invention

[0007] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes a deep foundation pit assembled steel support frame structure.

[0008] The technical solution adopted in the present invention is as follows:

[0009] The utility model relates to an assembled steel support frame structure for a deep foundation pit, comprising lattice columns, a supporting mechanism, a perimeter purlin and a steel beam, wherein the lattice columns are arranged at intervals, and the supporting mechanism comprises an upper supporting column, a lower supporting column and two groups of tensioning assemblies, wherein the upper supporting column and the lower supporting column are respectively perpendicular to the lattice columns and are installed in different holes of the lattice columns up and down, the two groups of tensioning assemblies are symmetrically arranged on both sides of the lattice columns, and the upper and lower ends of the tensioning assemblies are respectively detachably connected to the upper supporting column and the lower supporting column, the upper supporting column and the lower supporting column are symmetrically provided with limiting assemblies on both sides of the lattice column, and the limiting assemblies are detachably connected to the lattice columns, the perimeter purlin is arranged on the side wall of the foundation pit, the steel beam is erected on the upper supporting column, and the end of the steel beam is detachably connected to the perimeter purlin.

[0010] In a further technical solution, the lattice column includes four angle steels and multiple welding units. The four angle steels are arranged according to the four corners of a square. Each welding unit is welded into a square by four steel plates connected end to end, and is sequentially sleeved on the outside of the four angle steels from top to bottom and welded to the angle steels.

[0011] In a further technical solution, the limiting assembly includes two limiting plates, which are respectively welded to the bottom surface of the upper support column and the top surface of the lower support column. The distance between the two limiting plates is the same as the thickness of the steel plate, so that the two limiting plates are snap-fitted with the steel plates on the adjacent side.

[0012] In a further technical solution, the tensioning assembly includes a first screw, a second screw and a tensioning adjustment threaded barrel, the ends of the first screw and the second screw are detachably connected to the bottom surface of the upper support column and the top surface of the lower support column respectively, the thread directions of the first screw and the second screw are opposite, and the first screw and the second screw are both threadedly connected with a first limiting nut, the two ends of the tensioning adjustment threaded barrel are respectively threadedly connected to the first screw and the second screw, and the tensioning adjustment threaded barrel is provided with a first handle, which can control the rotation of the tensioning adjustment threaded barrel to make the first screw and the second screw approach or move away from each other.

[0013] In a further technical solution, the ends of the first screw and the second screw are both provided with through holes, the bottom surface of the upper support column and the top surface of the lower support column are both provided with pull rod seats, and the pull rod seats are threadedly connected with bolts that match the through holes.

[0014] In a further technical solution, the upper support column is longer than the lower support column, and the lower support column is provided with an oblique support rod, which is inclined toward the far end of the upper support column, and the two ends of the oblique support rod are respectively detachably connected to the upper support column and the lower support column.

[0015] In a further technical solution, the oblique support rod includes a third screw, a fourth screw and an oblique adjustment threaded barrel. The ends of the third screw and the fourth screw are detachably connected to the bottom surface of the upper support column and the top surface of the lower support column respectively. The thread directions of the third screw and the fourth screw are opposite. The third screw and the fourth screw are both threadedly connected with a second limiting nut. The two ends of the oblique adjustment threaded barrel are respectively threadedly connected to the third screw and the fourth screw. A second handle is provided on the oblique adjustment threaded barrel, which can control the rotation of the oblique adjustment threaded barrel to make the third screw and the fourth screw approach or move away from each other.

[0016] In a further technical solution, the steel beam includes a first support beam, a second support beam and a pre-tensioning force applying cylinder. The ends of the first support beam and the second support beam that are far away from each other are respectively detachably connected to the purlins on both sides, and the ends of the first support beam and the second support beam that are close to each other are respectively detachably connected to the two ends of the pre-tensioning force applying cylinder.

[0017] In a further technical solution, one end of the section steel beam close to the perimeter purlin is detachably connected to a diagonal bracing beam, and one end of the diagonal bracing beam away from the section steel beam is detachably connected to the perimeter purlin.

[0018] In a further technical solution, a plurality of transverse connecting rods are provided between adjacent steel beams, and the transverse connecting rods are perpendicular to the steel beams on both sides and are detachably connected.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. The present invention does not require a large amount of auxiliary welding work, and can also ensure the connection strength between the steel beam and the lattice column. It also does not require a large number of screw holes to be opened, which reduces the workload of the staff. It is not only convenient and quick to disassemble, but also will not damage the material and can be reused.

[0021] 2. The present invention reduces the number of screw holes on the lattice column, avoiding the risks of reduced strength, reduced rigidity, decreased fatigue performance, stress concentration, and corrosion caused by the holes, thereby ensuring the performance of the lattice column.

[0022] 3. The present invention simplifies the construction procedure. Through the prefabricated design, on-site construction is simple, and the installation and disassembly speeds are fast. During the entire construction process, the investment in construction time and labor costs is greatly reduced, and the construction efficiency is effectively improved. It has obvious advantages, especially in projects with tight construction schedules.

[0023] 4. The components of the present invention are easy to disassemble, thus avoiding damage to materials, facilitating reuse, reducing waste of disposable materials, lowering the investment cost of the project, and reducing pollution from waste building materials during the demolition process, which is in line with the concept of green building. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0025] Figure 1 It is a structural schematic diagram of the bracing support system of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the corner bracing system of the present invention;

[0027] Figure 3 Schematic diagram of the coordination between the lattice column and the supporting mechanism of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the support mechanism of the present invention.

[0029] Figure markings: 1-lattice column, 101-angle steel, 102-steel plate, 2-support mechanism, 201-upper support column, 202-lower support column, 203-tensioning assembly, 2031-first screw, 2032-second screw, 2033-tensioning adjustment threaded cylinder, 2034-first limiting nut, 2035-first handle, 3-purlin, 4-steel beam, 401-first support beam, 402-second support beam, 403-preload force applying cylinder, 5-limiting plate, 6-pull rod seat, 7-oblique support rod, 701-third screw, 702-fourth screw, 703-oblique adjustment threaded cylinder, 704-second limiting nut, 705-second handle, 8-oblique support beam, 9-transverse connecting rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See Figure 1-Figure 4The present invention provides a deep foundation pit assembled steel support frame structure, including a lattice column 1, a supporting mechanism 2, a purlin 3 and a steel beam 4. The lattice columns 1 are arranged at intervals, and the supporting mechanism 2 includes an upper supporting column 201, a lower supporting column 202 and two groups of tensioning components 203. The upper supporting column 201 and the lower supporting column 202 are respectively perpendicular to the lattice column 1 and installed in different holes of the lattice column 1 up and down. The two groups of tensioning components 203 are symmetrically arranged on both sides of the lattice column 1, and the upper and lower ends of the tensioning components 203 are respectively detachably connected to the upper supporting column 201 and the lower supporting column 202. The upper supporting column 201 and the lower supporting column 202 are symmetrically provided with limiting components on both sides of the lattice column 1, and the limiting components are detachably connected to the lattice column 1. The purlin 3 is arranged on the side wall of the foundation pit, and the steel beam 4 is erected on the upper supporting column 201, and the end of the steel beam 4 is detachably connected to the purlin 3.

[0032] When using the above-mentioned deep foundation pit prefabricated steel support frame structure for foundation pit support, first, according to the design requirements, the lattice columns 1 are arranged at predetermined intervals in the foundation pit by pre-embedding, laying a solid foundation for the subsequent support system construction. Then, the first excavation is carried out. After the excavation reaches the predetermined depth, the purlin 3 is fixed to the side wall of the foundation pit by bolts. After that, the installation stage of the support mechanism 2 is entered. The upper support column 201 and the lower support column 202 in the support mechanism 2 are vertically inserted into different holes of the lattice column 1 according to the upper and lower arrangement relationship, and the upper support column 201 and the lower support column 202 on both sides of the lattice column 1 are connected together by two sets of tensioning components 203. At the same time, the limiting components on both sides of the lattice column 1 cooperate with the lattice column 1 so that the upper support column 201 and the lower support column 202 are clamped and installed on the lattice column 1, preventing the upper support column 201 and the lower support column 202 from moving and shaking, thereby ensuring the stability of the overall structure. Subsequently, the steel beam 4 is erected on the upper support column 201 of the lattice column 1, and the end of the steel beam 4 is connected to the purlin 3 to complete the construction of this steel beam 4. The other steel beams 4, whether they are other steel beams 4 used as opposite braces or steel beams 4 used as angle braces, have the same construction principle. The only difference is the length, direction, and connection angle of the steel beam 4 with the purlin 3. For details, please refer to the construction of the opposite bracing support system. Figure 1 , as the corner bracing system for construction, please refer to Figure 2. Through the above operations, the construction of a complete support frame unit can be completed. With the completion of the construction of a complete support frame unit, the cycle of foundation pit excavation and support structure construction is immediately launched. After each layer of excavation is completed, the support frame structure of the corresponding layer is immediately constructed until the final design depth of the deep foundation pit is reached. In this process, the installation of each layer of support structure strictly follows the above process to ensure the continuity and consistency of the entire support system. When the foundation pit construction is completed and the main structure construction stage is entered, the dismantling of the support frame structure also follows the principle of reverse operation, and is carried out layer by layer from bottom to top. Since the components are all detachable connections, these detachable connections include but are not limited to the use of bolts for connection, this design does not require a large amount of auxiliary welding work compared to the existing technology, and can also ensure the connection strength of the steel beam 4 and the lattice column 1. It also does not require a large number of screw holes to be opened, reducing the workload of the staff. It is not only convenient and quick to disassemble, but also does not damage the material and can be reused. Furthermore, by eliminating the need for screw holes on the lattice column 1, risks such as reduced strength, stiffness, fatigue performance, stress concentration, and corrosion caused by these holes are avoided, thereby ensuring the performance of the lattice column 1. Furthermore, eliminating the need for brackets and joists not only reduces the additional load-bearing burden on the lattice column 1, but also simplifies the construction process, reduces material consumption and labor, and facilitates use. The support frame structure designed above also offers the following beneficial effects during use:

[0033] Improve construction efficiency: The construction procedure is simplified. Through prefabricated design, on-site construction is simple, and the installation and disassembly speeds are fast. During the entire construction process, the investment in construction time and labor costs is greatly reduced, which is especially advantageous in projects with tight schedules.

[0034] Reduce construction costs: The prefabricated structure allows materials to be reused, reducing the waste of disposable materials and lowering the investment cost of the project.

[0035] Reduce environmental pollution: Traditional cast-in-place concrete support structures generate a large amount of construction waste, while prefabricated steel structures reduce the pollution of waste building materials during the demolition process, which is in line with the concept of green building.

[0036] In a specific embodiment, the lattice column 1 includes four angle steels 101 and multiple welding units. The four angle steels 101 are arranged according to the four corners of a square. Each welding unit is welded into a square by four steel plates 102 connected end to end, and is sequentially sleeved on the outside of the four angle steels 101 from top to bottom and welded to the angle steels 101.

[0037] By arranging angle steels 101 at the four corners of a square and welding them together with steel plates 102, a sturdy overall frame is formed. This framework not only offers strong rigidity and bending resistance, but can also withstand significant external forces, providing more reliable support, particularly in deep foundation pit support. This manufacturing method optimizes material utilization. The combination of angle steels 101 and steel plates 102 ensures that the lattice column 1 not only has high strength but also saves material costs.

[0038] In a specific embodiment, the limiting assembly includes two limiting plates 5, which are respectively welded to the bottom surface of the upper support column 201 and the top surface of the lower support column 202. The distance between the two limiting plates 5 is the same as the thickness of the steel plate 102, so that the two limiting plates 5 are snap-fitted with the steel plate 102 on the adjacent side.

[0039] By welding the limiting components on the bottom surface of the upper support column 201 and the top surface of the lower support column 202 respectively, the distance between the two limiting plates 5 in the limiting component is the same as the thickness of the steel plate 102, ensuring that the limiting plates 5 and the steel plate 102 can be accurately snapped together. This snap-on design is not just a simple connection, but also a locking of the position and posture of the upper support column 201 and the lower support column 202. The limiting plate 5 can effectively limit the forward and backward movement of the upper support column 201 and the lower support column 202 in the installation position, as well as the shaking in the up, down, left and right directions. This stability control is crucial to ensuring the overall rigidity and deformation resistance of the support mechanism 2, especially when it is under pressure from the steel beam 4. Its importance is even greater through the connection of the tensioning component 203, so that the entire support mechanism 2 can always maintain stable support for the steel beam 4 during use, and can demonstrate excellent load-bearing capacity and stability even in complex and changeable construction environments.

[0040] In a specific embodiment, see Figure 4 The tensioning assembly 203 includes a first screw 2031, a second screw 2032 and a tensioning adjustment threaded barrel 2033. The ends of the first screw 2031 and the second screw 2032 are detachably connected to the bottom surface of the upper support column 201 and the top surface of the lower support column 202, respectively. The thread directions of the first screw 2031 and the second screw 2032 are opposite. The first screw 2031 and the second screw 2032 are both threadedly connected with a first limiting nut 2034. The two ends of the tensioning adjustment threaded barrel 2033 are threadedly connected to the first screw 2031 and the second screw 2032, respectively. The tensioning adjustment threaded barrel 2033 is provided with a first handle 2035, which can control the rotation of the tensioning adjustment threaded barrel 2033 to make the first screw 2031 and the second screw 2032 approach or move away from each other.

[0041] The first and second screw rods 2031 and 2032 are detachably connected to the bottom surface of the upper support column 201 and the top surface of the lower support column 202, respectively. Their threads run in opposite directions, allowing the first and second screw rods 2031 and 2032 to move synchronously but in opposite directions when the tensioning adjustment threaded barrel 2033 is rotated, thereby fine-tuning the spacing between the upper and lower support columns 201 and 202. As the spacing is fine-tuned, the upper and lower support columns 201 and 202 gradually cling to and clamp onto the lattice column 1. The tensioning adjustment threaded barrel 2033 is then tightened by tightening the first limiting nut 2034 at both ends to form a stable and reliable support structure. Compared to the conventional bolt connection and bracket arrangement methods, this greatly simplifies the installation process and reduces the workload of the staff. It eliminates the need for extensive screw hole drilling, saving time and labor costs while also reducing the potential risk of damage to the lattice column 1 structure. Furthermore, this installation method is simple to operate and quick to install, further improving construction efficiency.

[0042] In a specific embodiment, see Figure 4 The ends of the first screw rod 2031 and the second screw rod 2032 are both provided with through holes, and the bottom surface of the upper support column 201 and the top surface of the lower support column 202 are both provided with a pull rod seat 6, and the pull rod seat 6 is threadedly connected with a bolt that matches the through hole.

[0043] Through holes are provided at the ends of the first and second screw rods 2031, 2032. Through the use of tie rod holders 6 and bolts, the first and second screw rods 2031, 2032 are securely connected to the bottom surface of the upper support column 201 and the top surface of the lower support column 202, respectively. This detachable connection makes the installation and removal of the screw rods more convenient and quick. It can also be quickly removed after construction is complete, facilitating the recycling of the screw rods and other components, improving material utilization, and meeting the requirements of environmental protection and sustainable development. At the same time, this design ensures the secure connection and ensures the stability of the structure during construction.

[0044] In a specific embodiment, see Figure 3 and Figure 4 The upper support column 201 is longer than the lower support column 202. The lower support column 202 is provided with an oblique support rod 7. The oblique support rod 7 is inclined toward the far end of the upper support column 201, and the two ends of the oblique support rod 7 are detachably connected to the upper support column 201 and the lower support column 202 respectively.

[0045] The arrangement of the diagonal brace rods 7 not only provides tension, enabling the upper and lower support columns 201, 202 to be clamped and mounted on the lattice column 1, but also effectively distributes the vertical load borne by the upper support column 201 to the lower support column 202 and the foundation, thereby reducing the pressure on the upper support column 201 at a single point, significantly improving its load-bearing capacity, and increasing the rigidity and stability of the entire structure. This reduces the risk of structural deformation and damage.

[0046] In a specific embodiment, see Figure 3 and Figure 4 The oblique support rod 7 includes a third screw 701, a fourth screw 702 and an oblique adjustment threaded barrel 703. The ends of the third screw 701 and the fourth screw 702 are detachably connected to the bottom surface of the upper support column 201 and the top surface of the lower support column 202 respectively. The thread directions of the third screw 701 and the fourth screw 702 are opposite. The third screw 701 and the fourth screw 702 are both threadedly connected with a second limiting nut 704. The two ends of the oblique adjustment threaded barrel 703 are threadedly connected to the third screw 701 and the fourth screw 702 respectively. The oblique adjustment threaded barrel 703 is provided with a second handle 705, which can control the rotation of the oblique adjustment threaded barrel 703 to make the third screw 701 and the fourth screw 702 approach or move away from each other.

[0047] The installation principle and adjustment principle of the inclined support rod 7 are the same as those of the tensioning component 203, and the only difference is the angle setting. By precisely controlling the installation position and tilt angle, the advantages of the inclined support rod 7 can be fully utilized to provide stable and reliable support for the supporting structure.

[0048] In a specific embodiment, see Figure 1 and Figure 2 The steel beam 4 includes a first support beam 401, a second support beam 402 and a pre-tightening force applying cylinder 403. The ends of the first support beam 401 and the second support beam 402 that are away from each other are respectively detachably connected to the purlins 3 on both sides, and the ends of the first support beam 401 and the second support beam 402 that are close to each other are respectively detachably connected to the two ends of the pre-tightening force applying cylinder 403.

[0049] The steel beam 4, through the coordinated cooperation of the first support beam 401, the second support beam 402 and the pre-tightening force applying cylinder 403, is connected to the purlins 3 on both sides. Then, a certain pre-tightening force is applied by running the pre-tightening force applying cylinder 403. As the pre-tightening force increases, the purlins 3 are firmly pressed against the side walls of the foundation pit, reducing the displacement and loosening risks of the purlins 3, effectively preventing the deformation or displacement of the side walls of the foundation pit due to factors such as soil pressure and groundwater, thereby significantly improving the support effect of the foundation pit. In addition, the application of pre-tightening force also makes the entire support system more stable, able to better resist the effects of external loads, ensure the safety and stability during the foundation pit construction process, and provide a strong guarantee for the smooth progress of the foundation pit project.

[0050] In a specific embodiment, see Figure 1 The end of the steel beam 4 close to the purlin 3 is detachably connected to the diagonal bracing beam 8, and the end of the diagonal bracing beam 8 away from the steel beam 4 is detachably connected to the purlin 3.

[0051] A stable triangular structure is formed between the diagonal bracing beam 8, the steel beam 4 and the purlin 3. This structure is very stable mechanically and can effectively resist the pressure from the side walls of the foundation pit and the horizontal force, thereby enhancing the stability of the entire support structure. Moreover, the setting of the diagonal bracing beam 8 can disperse the loads from different directions, reduce the risk of local deformation of the purlin 3 and the steel beam 4 when subjected to stress, and enhance the anti-deformation ability of the foundation pit support system under complex working conditions, thereby improving the reliability and durability of the entire support structure. In addition, the detachable design of the diagonal bracing beam 8 enables it to flexibly adjust the installation position according to the depth of the foundation pit and the actual working conditions on site, enhancing the adaptability of the support system to different construction conditions and providing a more reliable solution for foundation pit support under complex construction environments.

[0052] In a specific embodiment, see Figure 1 and Figure 3 A plurality of transverse connecting rods 9 are provided between adjacent steel beams 4, and the transverse connecting rods 9 are perpendicular to the steel beams 4 on both sides and are detachably connected.

[0053] By installing multiple transverse tie rods 9 between adjacent steel beams 4, a transverse support network is formed. This transverse connection effectively improves the coordinated load-bearing capacity of adjacent steel beams 4, preventing deformation or instability caused by excessive loads on a single steel beam 4, thereby significantly enhancing the rigidity and stability of the entire support structure. It also helps to evenly distribute external loads from all directions across the multiple steel beams 4, effectively resisting lateral loads and torsional moments, further enhancing the foundation pit support system's ability to resist lateral forces and torsional moments, and making the structure safer and more reliable under complex load conditions.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A deep foundation pit assembled steel support frame structure, characterized in that: The invention comprises a lattice column (1), a supporting mechanism (2), a purlin (3) and a steel beam (4), wherein the lattice columns (1) are arranged at intervals, and the supporting mechanism (2) comprises an upper supporting column (201), a lower supporting column (202) and two groups of tensioning assemblies (203), wherein the upper supporting column (201) and the lower supporting column (202) are respectively perpendicular to the lattice column (1) and are installed in different holes of the lattice column (1) from top to bottom, and the two groups of tensioning assemblies (203) are symmetrically arranged on both sides of the lattice column (1), and the The upper and lower ends of the tensioning assembly (203) are detachably connected to the upper support column (201) and the lower support column (202), respectively; the upper support column (201) and the lower support column (202) are symmetrically provided with limit assemblies on both sides of the lattice column (1); the limit assemblies are detachably connected to the lattice column (1); the surrounding purlin (3) is provided on the side wall of the foundation pit; the steel beam (4) is erected on the upper support column (201), and the end of the steel beam (4) is detachably connected to the surrounding purlin (3); The lattice column (1) comprises four angle steels (101) and a plurality of welding units, wherein the four angle steels (101) are arranged at the four corners of a square, and each welding unit is formed by welding four steel plates (102) end to end into a square, and is sequentially sleeved on the outside of the four angle steels (101) from top to bottom, and is welded and fixed to the angle steels (101); The limiting assembly comprises two limiting plates (5), the limiting plates (5) being welded to the bottom surface of the upper support column (201) and the top surface of the lower support column (202), respectively. The distance between the two limiting plates (5) is the same as the thickness of the steel plate (102), so that the two limiting plates (5) are snap-fitted with the steel plate (102) on the adjacent side. The upper support column (201) is longer than the lower support column (202), and the lower support column (202) is provided with an oblique support rod (7), the oblique support rod (7) is inclined toward the distal end of the upper support column (201), and the two ends of the oblique support rod (7) are detachably connected to the upper support column (201) and the lower support column (202), respectively; One end of the section steel beam (4) close to the perimeter purlin (3) is detachably connected to a diagonal bracing beam (8), and one end of the diagonal bracing beam (8) away from the section steel beam (4) is detachably connected to the perimeter purlin (3); A plurality of transverse connecting rods (9) are provided between adjacent section steel beams (4), and the transverse connecting rods (9) are vertically and detachably connected to the section steel beams (4) on both sides.

2. The deep foundation pit assembled steel support frame structure according to claim 1, characterized in that: The tensioning assembly (203) comprises a first screw rod (2031), a second screw rod (2032) and a tensioning adjustment threaded barrel (2033), wherein the ends of the first screw rod (2031) and the second screw rod (2032) are detachably connected to the bottom surface of the upper support column (201) and the top surface of the lower support column (202), respectively; the thread directions of the first screw rod (2031) and the second screw rod (2032) are opposite; the first screw rod (2031) and the second screw rod (2032) are both threadedly connected with a first limiting nut (2034); the two ends of the tensioning adjustment threaded barrel (2033) are respectively threadedly connected to the first screw rod (2031) and the second screw rod (2032); the tensioning adjustment threaded barrel (2033) is provided with a first handle (2035), which can control the rotation of the tensioning adjustment threaded barrel (2033) to move the first screw rod (2031) and the second screw rod (2032) closer to or farther away from each other.

3. The deep foundation pit assembled steel support frame structure according to claim 2, characterized in that: Through holes are provided at the ends of the first screw rod (2031) and the second screw rod (2032), and pull rod seats (6) are provided on the bottom surface of the upper support column (201) and the top surface of the lower support column (202), and bolts matching the through holes are threadedly connected on the pull rod seats (6).

4. The deep foundation pit assembled steel support frame structure according to claim 1, characterized in that: The oblique support rod (7) comprises a third screw rod (701), a fourth screw rod (702) and an oblique adjustment threaded barrel (703), the ends of the third screw rod (701) and the fourth screw rod (702) are detachably connected to the bottom surface of the upper support column (201) and the top surface of the lower support column (202), respectively, the thread directions of the third screw rod (701) and the fourth screw rod (702) are opposite, the third screw rod (701) and the fourth screw rod (702) are both threadedly connected with a second limiting nut (704), the two ends of the oblique adjustment threaded barrel (703) are respectively threadedly connected to the third screw rod (701) and the fourth screw rod (702), and the oblique adjustment threaded barrel (703) is provided with a second handle (705) for controlling the rotation of the oblique adjustment threaded barrel (703) so that the third screw rod (701) and the fourth screw rod (702) are closer to or farther away from each other.

5. The deep foundation pit assembled steel support frame structure according to claim 1, characterized in that: The steel beam (4) comprises a first support beam (401), a second support beam (402) and a pre-tightening force applying cylinder (403); the ends of the first support beam (401) and the second support beam (402) that are away from each other are detachably connected to the purlins (3) on both sides; and the ends of the first support beam (401) and the second support beam (402) that are close to each other are detachably connected to the two ends of the pre-tightening force applying cylinder (403).

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