Steel structure supporting structure of assembly type deep foundation pit

Abstract

The invention provides a steel structure supporting structure of an assembly type deep foundation pit, and relates to the technical field of steel structure supporting, the steel structure supporting structure comprises four line-shaped steel structures, the four line-shaped steel structures are sequentially spliced end to end to form a rectangular frame structure, one side of each line-shaped steel structure is provided with a mounting plate, and the mounting plates are mounted on an enclosure wall; a force uniformizing mechanism is arranged between the linear steel structure and the mounting plate and can evenly distribute the acting force of soil on the enclosure wall on the linear steel structure. According to the steel structure supporting structure of the fabricated deep foundation pit, the linear steel structure, the mounting plate and the force equalizing mechanism are arranged and used in cooperation with an enclosure wall in the deep foundation pit, so that the pressure of soil on the side wall of the foundation pit, the pressure of underground water, the dynamic load in the construction process and the like can be evenly distributed on the linear steel structure; and the situation that the structure is damaged due to stress concentration caused by overlarge local stress of the steel enclosing purlin and collapse occurs is reduced.

Description

Technical Field

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

[0002] Against the backdrop of accelerating modern urbanization, the construction industry is booming, with all kinds of large-scale buildings, high-rise buildings and underground space development projects springing up like mushrooms after a rain; these construction projects are making increasingly in-depth use of underground space, and deep foundation pit projects, as an important part of underground engineering construction, are increasing in scale and depth. Deep foundation pits generally refer to projects with an excavation depth of more than 5 meters (including 5 meters), or projects with a depth of less than 5 meters but with particularly complex geological conditions, surrounding environment and underground pipelines.

[0003] As urban land resources become increasingly scarce, construction projects have to expand underground space to meet diverse functional needs, such as building underground parking lots, underground shopping malls, subway stations, etc. This makes deep foundation pit projects face more complex challenges; on the one hand, deep foundation pits in cities are often close to existing buildings, roads, and various underground pipelines, and the construction site is narrow. During the construction process, the protection requirements for the surrounding environment of the foundation pit are extremely high. If you are not careful, the deformation of the foundation pit may cause cracks in surrounding buildings and rupture of underground pipelines. Serious consequences; on the other hand, the geological conditions in different regions vary greatly, from soft soil strata to rock strata, from high water level areas to complex geological fault areas. Deep foundation pit projects need to deal with various complex geological conditions, which puts forward strict requirements on the design and construction of foundation pit support structures. In deep foundation pit construction, the support structure plays a vital role. It is directly related to the safety of foundation pit construction and the stability of the surrounding environment. The deep foundation pit support structure needs to withstand the pressure of the soil on the side walls of the foundation pit, the pressure of groundwater, and the dynamic load during the construction process. Among them, steel structure support has the advantages of high strength, light weight, and fast construction speed. Compared with traditional concrete support structures, steel structure support can be prefabricated in the factory and then transported to the construction site for rapid assembly, which greatly shortens the construction period and reduces the impact of the construction process on the surrounding environment. However, steel structure support usually uses rigid connection methods (such as welding, riveting, etc.) or reinforcement measures to transmit and disperse force. It does not have a buffering effect during actual use. In addition, when there is a local collapse phenomenon, the local force on the steel purlin is too large, which may cause the structure to be damaged due to stress concentration, resulting in collapse. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a prefabricated steel structure supporting structure for a deep foundation pit.

[0005] The present invention provides a prefabricated steel structure support structure for a deep foundation pit, comprising four I-shaped steel structures, which are sequentially spliced ​​end to end to form a rectangular frame structure, and a mounting plate is provided on one side of the I-shaped steel structure, and the mounting plate is mounted on a retaining wall; A force equalizing mechanism is arranged between the I-shaped steel structure and the mounting plate, and the force equalizing mechanism can evenly distribute the force exerted by the soil on the retaining wall on the I-shaped steel structure.

[0006] Preferably, the force equalizing mechanism includes a groove and a force block; a movable groove adapted to the force block is opened on one side of the groove, the force block is slidably installed in the movable groove, and the force block can block the side opening of the movable groove, the side of the force block away from the groove is installed on the side of the mounting plate away from the retaining wall, and the side of the groove away from the force block is detachably installed on the I-shaped steel structure.

[0007] Preferably, the I-shaped steel structure comprises a plurality of steel purlins; a mounting groove is provided on one side of the steel purlin, and the groove bar is detachably mounted in the mounting groove; A fixing mechanism is installed on the steel purlin, and the fixing mechanism is used to fix the groove bar in the installation groove.

[0008] Preferably, the fixing mechanism includes a trapezoidal positioning block, a movable rod, a driving bar and a positioning spring; a receiving groove capable of accommodating the trapezoidal positioning block is provided on the inner wall of the mounting groove, the movable rod slides through the steel purlin and is connected to the trapezoidal positioning block, the driving bar is connected to the end of the movable rod away from the trapezoidal positioning block, the positioning spring is located in the receiving groove, and the two ends of the positioning spring respectively abut against the end inner wall of the receiving groove and the trapezoidal positioning block.

[0009] Preferably, the fixing mechanism further comprises a hard tube and a positioning strip; the number of the hard tubes is two, both of which are fixedly connected to the top of the groove strip, and the hard tubes are connected to the movable groove, and the steel purlin is provided with a positioning groove adapted to the hard tube; The positioning strip is fixed on the top of the groove strip, and the inner wall of the mounting groove is provided with a limiting groove matched with the positioning strip.

[0010] Preferably, it further comprises a rectangular steel structure frame, wherein the rectangular steel structure frame comprises a reinforcement bar and a triangular brace; the number of the reinforcement bar and the triangular brace is four, the four triangular braces are respectively located at the four corners of the rectangular steel structure frame, and the two ends of the reinforcement bar are respectively connected to the triangular braces at the two corners; The steel perimeter purlin is installed on the outside of the reinforcement strip.

[0011] Preferably, a threaded rod is fixedly connected to the side of the groove away from the force applying block, one end of the threaded rod passes through the steel purlin and the reinforcement strip in sequence, and a locking nut is threadedly sleeved on the end of the threaded rod.

[0012] Preferably, the rectangular steel structure frame further comprises a mounting tube, a support rod and a driving mechanism; support rods are slidably inserted at both ends of the mounting tube, and the axes of the mounting tube and the support rod coincide with each other; The driving mechanism is used to drive the support rod to slide in the installation cylinder.

[0013] Preferably, the driving mechanism comprises a double-axis hydraulic cylinder and a stabilizing plate; the double-axis hydraulic cylinder is fixedly installed in the mounting tube, the stabilizing plate is fixedly installed in the supporting rod, and the two output shafts of the double-axis hydraulic cylinder are fixedly connected to the two stabilizing plates respectively.

[0014] The present invention proposes an assembled steel structure support structure for a deep foundation pit, which has the following beneficial effects: by setting up a straight-line steel structure, a mounting plate and a force-equalizing mechanism, in a deep foundation pit, in conjunction with a retaining wall, the pressure of the soil on the side walls of the foundation pit, the pressure of groundwater and the dynamic load during the construction process can be evenly distributed on the straight-line steel structure, thereby reducing the stress concentration and structure damage caused by excessive local force on the steel purlin and the occurrence of collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a prefabricated steel structure support structure for a deep foundation pit proposed by the present invention; Figure 2 A side cross-sectional view of a steel purlin, a channel bar, a force block and a reinforcement bar in a prefabricated steel structure support structure for a deep foundation pit proposed by the present invention; Figure 3 A cross-sectional view of a groove bar, a force block and a mounting plate in a steel structure support structure of an assembled deep foundation pit proposed by the present invention; Figure 4 A cross-sectional view of the connection between the installation tube and the support rod in the steel structure support structure of the assembled deep foundation pit proposed by the present invention; Figure 5 A steel structure support structure for a prefabricated deep foundation pit proposed by the present invention Figure 2 Enlarged view of point A in the middle; Figure 6 It is a force diagram of the groove bars when the soil around the deep foundation pit in the steel structure supporting structure of the assembled deep foundation pit proposed by the present invention applies force to the force equalizing mechanism.

[0016] In the figure: 1. Steel purlin; 2. Channel bar; 3. Force block; 4. Mounting plate; 5. Enclosure wall; 6. Trapezoidal positioning block; 7. Movable rod; 8. Driving bar; 9. Positioning spring; 10. Hard pipe; 11. Positioning bar; 12. Reinforcement bar; 13. Triangular support; 14. Threaded rod; 15. Locking nut; 16. Mounting tube; 17. Support rod; 18. Dual-axis hydraulic cylinder; 19. Stabilizing plate. DETAILED DESCRIPTION

[0017] Reference Figure 1-Figure 5 The present invention proposes a prefabricated steel structure support structure for a deep foundation pit, comprising four I-shaped steel structures, which are spliced ​​end to end in sequence to form a rectangular frame structure. A mounting plate 4 is arranged on one side of the I-shaped steel structure, and the mounting plate 4 is mounted on a retaining wall 5. A force equalizing mechanism is arranged between the I-shaped steel structure and the mounting plate 4, and the force equalizing mechanism can evenly distribute the force of the soil on the retaining wall 5 on the I-shaped steel structure. In the deep foundation pit construction scene, the soil around the foundation pit will produce pressure on the retaining wall 5, and the force equalizing mechanism will play a role in evenly transmitting and distributing the force of the soil on the retaining wall 5 to the I-shaped steel structure. Through the force equalizing mechanism, the force of the entire support structure is more evenly distributed. For example, in a traditional support structure, if the soil pressure at a certain place in the foundation pit is relatively large, the steel purlin near this place may be subjected to a pressure far exceeding its design strength, thereby causing deformation or even damage. The present structure disperses this part of the relatively large pressure to the entire I-shaped steel structure through the force equalizing mechanism, thereby reducing the force on a single part and greatly improving the stability and safety of the support structure.

[0018] like Figure 2 , Figure 3 and Figure 6 As shown in , the force equalizing mechanism includes a groove bar 2 and a force applying block 3; a movable groove matching the force applying block 3 is provided on one side of the groove bar 2, the force applying block 3 is slidably installed in the movable groove, and the force applying block 3 can block the side opening of the movable groove, so that the movable groove forms a relatively closed space, which is filled with water, and the side of the force applying block 3 away from the groove bar 2 is installed with the side of the mounting plate 4 away from the enclosure wall 5, and the side of the groove bar 2 away from the force applying block 3 is detachably installed with the straight steel structure, and when the soil applies pressure to the enclosure wall 5, the pressure is transmitted to the force applying block 3 through the mounting plate 4. Since the movable groove is filled with water, the water acts as a medium for transmitting pressure during the sliding process of the force applying block 3. The force block 3 pushes the water, and the water transmits the pressure evenly along the length direction of the groove 2, and then evenly distributes the force to the connected I-shaped steel structure. At the same time, the fluidity of the water enables the pressure to be diffused in the groove 2 in an all-round and more even manner. Even if the direction of the soil pressure changes, the water can quickly adjust the pressure transmission path to ensure that the pressure can be effectively transmitted to all parts of the I-shaped steel structure. In addition, water can play a buffering and shock-absorbing effect. When the foundation pit is subjected to sudden impact force, such as blasting vibration during construction, heavy machinery operation vibration, etc., the water can absorb and disperse part of the energy and reduce the impact on the support structure. Similar to the shock absorption system of a car, it protects the various components of the support structure from damage caused by instantaneous excessive impact force, thereby extending the service life of the support structure.

[0019] like Figure 1 and Figure 2As shown in the figure, the I-shaped steel structure includes a plurality of steel purlins 1; a mounting groove is provided on one side of the steel purlin 1, and the steel purlins 1 are connected by welding, riveting, bolts and other existing technologies, and the groove bar 2 can be detachably installed in the mounting groove, and a fixing mechanism is installed on the steel purlin 1, and the fixing mechanism is used to fix the groove bar 2 in the mounting groove. During installation, the groove bar 2 is inserted into the mounting groove of the steel purlin 1, and then the groove bar 2 is firmly fixed in the mounting groove by the fixing mechanism, ensuring that the groove bar 2 is tightly connected to the steel purlin 1, thereby ensuring that the force balancing mechanism can effectively transmit force to each of the I-shaped steel structure. On a steel purlin 1, multiple steel purlins 1 form a straight steel structure, so that the structure has better flexibility and scalability while ensuring strength. The length of the straight steel structure can be adjusted by flexibly increasing or decreasing the number of steel purlins 1 according to the actual length requirement of the foundation pit. The design of the installation groove and the fixing mechanism enhances the stability of the connection between the groove bar 2 and the steel purlin 1. In a complex construction environment, such as when subjected to large vibrations or soil pressure fluctuations, the fixing mechanism can prevent the groove bar 2 from falling off the installation groove, ensuring that the force equalizing mechanism continues to work normally and ensuring the reliability of the support structure.

[0020] like Figure 2 and Figure 5 In the embodiment, the fixing mechanism includes a trapezoidal positioning block 6, a movable rod 7, a driving bar 8 and a positioning spring 9; the inner wall of the installation groove is provided with a receiving groove capable of receiving the trapezoidal positioning block 6, the movable rod 7 slides through the steel purlin 1 and is connected to the trapezoidal positioning block 6, the driving bar 8 is connected to the end of the movable rod 7 away from the trapezoidal positioning block 6, the positioning spring 9 is located in the receiving groove, and the two ends of the positioning spring 9 are respectively against the inner wall of the end of the receiving groove and the trapezoidal positioning block 6. When the slot bar 2 is installed, the driving bar 8 is pushed to drive the movable rod 7 and the trapezoidal positioning block 6 to move into the receiving groove, and the positioning spring 9 is compressed at this time. When the slot bar 2 is inserted into place, the driving bar 8 is released, the positioning spring 9 rebounds, and the trapezoidal positioning block 6 is pushed into the corresponding position of the slot bar 2, thereby fixing the slot bar 2 in the installation groove. The matching design of the trapezoidal positioning block 6 and the positioning spring 9 provides a reliable and convenient fixing method. The shape of the trapezoidal positioning block 6 enables a large friction and clamping force to be generated when fixing the slot bar 2, effectively preventing the slot bar 2 from loosening. The elastic effect of the positioning spring 9 makes the fixing process more flexible. Even if there are certain errors in the installation process, the positioning spring 9 can be adjusted to a certain extent through its own elastic deformation to ensure the fixing effect. At the same time, through the operation of the drive bar 8, it is convenient for construction personnel to install and disassemble, thereby improving construction efficiency.

[0021] like Figure 1 , Figure 2 and Figure 3As shown in, the fixing mechanism also includes a hard tube 10 and a positioning strip 11; the number of hard tubes 10 is two, and the two hard tubes 10 are fixedly connected to the top of the groove bar 2, and the hard tube 10 is connected to the movable groove. Before use, the movable groove is empty, which can reduce the weight of the structure. When in use, water is added to the inside, and the amount of water added can be adjusted according to actual conditions. The initial space size of the movable groove is adjusted by sliding the force applying block 3, thereby changing the inclination angle of the retaining wall 5 against the soil walls around the deep foundation pit, so that the soil The force of the retaining wall 5 always remains in a vertical state, and then the two hard tubes 10 are blocked. During the construction process, the water added to the movable groove can also be adjusted. A clamping groove compatible with the hard tube 10 is opened on the steel purlin 1, and the positioning strip 11 is fixed to the top of the groove bar 2. The inner wall of the installation groove is provided with a limiting groove compatible with the positioning strip 11. When installing the groove bar 2, the hard tube 10 is inserted into the clamping groove of the steel purlin 1, and the positioning strip 11 is inserted into the limiting groove. 10 not only plays a positioning role, but also can enhance the strength of the connection between the groove bar 2 and the steel purlin 1 to a certain extent. At the same time, because it is connected to the movable groove, it can assist the force equalizing mechanism to better transmit force. The positioning bar 11 cooperates with the limiting groove to further ensure the accuracy of the installation position of the groove bar 2 and prevent the groove bar 2 from shifting in the installation groove. The setting of the hard tube 10 and the positioning bar 11 further improves the stability and positioning accuracy of the fixing mechanism. The cooperation of the hard tube 10 and the positioning groove increases the pull-out resistance and shear resistance of the connection while providing positioning. For example, when subjected to a large horizontal soil pressure, the hard tube 10 can effectively prevent the groove bar 2 from moving horizontally in the installation groove. The cooperation of the positioning bar 11 and the limiting groove enables the groove bar 2 to be quickly and accurately positioned during the installation process, reducing installation errors and improving installation efficiency. Moreover, this multi-component coordinated fixing method enhances the reliability of the entire fixing mechanism and ensures the stability of the connection between the force equalizing mechanism and the I-shaped steel structure.

[0022] like Figure 1 and Figure 2As shown in , it also includes a rectangular steel structure frame, which includes a reinforcing bar 12 and a triangular brace 13; the number of the reinforcing bar 12 and the triangular brace 13 are both four, and the four triangular braces 13 are respectively located at the four corners of the rectangular steel structure frame, and the two ends of the reinforcing bar 12 are respectively connected to the triangular braces 13 at the two corners, and the steel purlin 1 is installed on the outside of the reinforcing bar 12. The rectangular steel structure frame serves as the framework of the overall support structure and plays a supporting and reinforcing role. The triangular brace 13 uses the stability principle of the triangle to enhance the strength and stability of the four corners of the rectangular steel structure frame. The reinforcing bar 12 connects the triangular braces 13 at the four corners to further improve the integrity and bearing capacity of the entire frame. The steel purlin 1 is installed on the outside of the reinforcing bar 12 and works in conjunction with the rectangular steel structure frame to jointly withstand external forces such as soil pressure. The design of the rectangular steel structure frame greatly enhances the overall strength and stability of the support structure. The combination of the triangular support 13 and the reinforcement strip 12 forms a stable frame system that can effectively resist external forces from different directions. For example, when facing the complex soil pressure distribution around the foundation pit, the frame structure can evenly disperse the force to avoid excessive local force. Compared with the support method without such a frame structure, this structure can withstand a larger load, improve the safety and reliability of the support structure. At the same time, the existence of this frame structure provides a stable installation foundation for components such as the steel purlin 1, making the entire support structure more solid and extending the service life of the support structure.

[0023] like Figure 1 and Figure 2 As shown in the figure, a threaded rod 14 is fixedly connected to the side of the groove bar 2 away from the force block 3. One end of the threaded rod 14 passes through the steel purlin 1 and the reinforcement bar 12 in sequence. The end of the threaded rod 14 is threadedly sleeved with a locking nut 15. During installation, the threaded rod 14 is passed through the corresponding holes on the steel purlin 1 and the reinforcement bar 12, and then the locking nut 15 is tightened. Through the cooperation of the threaded rod 14 and the locking nut 15, the groove bar 2, the steel purlin 1 and the reinforcement bar 12 are tightly connected together, further enhancing the stability of the connection between them. The connection method of the threaded rod 14 and the locking nut 15 provides an additional In a complex construction environment, such as under large vibrations or long-term soil pressure, the fixing mechanism alone may not be able to fully guarantee the stability of the connection between the groove bar 2 and the steel purlin 1 and the reinforcement bar 12. The cooperation of the threaded rod 14 and the locking nut 15 can further enhance the connection strength on the basis of the fixing mechanism to prevent loosening between the components. This connection method is simple to operate and has obvious fastening effect. The tightening degree of the locking nut 15 can be adjusted according to actual needs to adapt to different construction requirements, thereby improving the reliability and adaptability of the support structure.

[0024] like Figure 1 and Figure 4As shown in the figure, the rectangular steel structure frame also includes a mounting tube 16, a support rod 17 and a driving mechanism; support rods 17 are slidably inserted at both ends of the mounting tube 16, and the axes of the mounting tube 16 and the support rod 17 coincide with each other. The driving mechanism is used to drive the support rod 17 to slide in the mounting tube 16. When it is necessary to adjust the size of the rectangular steel structure frame or to fine-tune the supporting structure, the driving mechanism is started to drive the support rod 17 to slide in the mounting tube 16. By controlling the length of the support rod 17 extended or retracted, the overall size of the rectangular steel structure frame can be adjusted to adapt to foundation pits of different sizes or changes in the construction process. The mounting tube 16, the support rod 17, and the support rod 17 are installed. The design of the support rod 17 and the driving mechanism gives the support structure a certain degree of adjustability. In actual construction, the size of the foundation pit may need to be adjusted due to geological conditions or design changes. Traditional support structures are often difficult to adapt to such changes. The present structure adjusts the position of the support rod 17 through the driving mechanism, which can quickly and flexibly change the size of the rectangular steel structure frame, thereby improving the versatility and adaptability of the support structure. For example, when the support needs to be strengthened in a part of the foundation pit, the driving mechanism can be used to extend the support rod 17 to enhance the support capacity of that part, thereby better coping with complex construction conditions and ensuring construction safety.

[0025] like Figure 1 and Figure 4 As shown in the figure, the driving mechanism includes a double-axis hydraulic cylinder 18 and a stabilizing plate 19; a pressure sensor is also installed in the double-axis hydraulic cylinder 18 to detect the hydraulic conditions in the double-axis hydraulic cylinder 18, so as to monitor the stress conditions of the support structure. The double-axis hydraulic cylinder 18 is fixedly installed in the mounting tube 16, and the stabilizing plate 19 is fixedly installed in the support rod 17. The two output shafts of the double-axis hydraulic cylinder 18 are respectively fixedly connected to the two stabilizing plates 19. When the double-axis hydraulic cylinder 18 is started, its two output shafts are synchronously extended and retracted, driving the stabilizing plate 19 connected thereto to move. Since the stabilizing plate 19 is fixed in the support rod 17, the The driving support rod 17 slides in the installation tube 16 to adjust the size of the rectangular steel structure frame. The combination of the double-axis hydraulic cylinder 18 and the stabilizing plate 19 provides a precise and stable driving method. The double-axis hydraulic cylinder 18 can ensure that the two support rods 17 move synchronously, so that the rectangular steel structure frame maintains balance when adjusting the size, avoiding excessive or asynchronous adjustment on one side. The existence of the stabilizing plate 19 enhances the stability of the connection between the support rod 17 and the output shaft of the double-axis hydraulic cylinder 18, and prevents the support rod 17 from shaking or deflecting during the driving process, ensuring a smooth and accurate adjustment process. This driving method can quickly and effectively adjust the size of the support structure, improve construction efficiency, and at the same time ensure the safety of the support structure during the adjustment process.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prefabricated steel structure support structure for a deep foundation pit, characterized in that: It comprises four straight steel structures, the four straight steel structures are sequentially spliced ​​end to end to form a rectangular frame structure, a mounting plate (4) is provided on one side of the straight steel structure, and the mounting plate (4) is mounted on the enclosure wall (5); A force equalizing mechanism is provided between the straight-line steel structure and the mounting plate (4), and the force equalizing mechanism can evenly distribute the force exerted by the soil on the retaining wall (5) on the straight-line steel structure.

2. The steel structure supporting structure for an assembled deep foundation pit according to claim 1 is characterized in that: The force equalizing mechanism comprises a groove bar (2) and a force applying block (3); a movable groove matched with the force applying block (3) is opened on one side of the groove bar (2); the force applying block (3) is slidably mounted in the movable groove, and the force applying block (3) is capable of blocking the side opening of the movable groove; the movable groove is filled with a fluid; a side of the force applying block (3) away from the groove bar (2) is mounted on a side of the mounting plate (4) away from the enclosure wall (5); and a side of the groove bar (2) away from the force applying block (3) is detachably mounted on a straight-line steel structure.

3. The steel structure supporting structure for an assembled deep foundation pit according to claim 2 is characterized in that: The I-shaped steel structure comprises a plurality of steel purlins (1); a mounting groove is provided on one side of the steel purlin (1), and the groove bar (2) is detachably mounted in the mounting groove; A fixing mechanism is installed on the steel purlin (1), and the fixing mechanism is used to fix the groove bar (2) in the installation groove.

4. The steel structure supporting structure for an assembled deep foundation pit according to claim 3 is characterized in that: The fixing mechanism comprises a trapezoidal positioning block (6), a movable rod (7), a driving bar (8) and a positioning spring (9); the inner wall of the mounting groove is provided with a receiving groove capable of receiving the trapezoidal positioning block (6); the movable rod (7) slides through the steel purlin (1) and is connected to the trapezoidal positioning block (6); the driving bar (8) is connected to one end of the movable rod (7) away from the trapezoidal positioning block (6); the positioning spring (9) is located in the receiving groove, and the two ends of the positioning spring (9) respectively abut against the inner wall of the end of the receiving groove and the trapezoidal positioning block (6).

5. The steel structure supporting structure for an assembled deep foundation pit according to claim 4 is characterized in that: The fixing mechanism further comprises a hard tube (10) and a positioning strip (11); the number of the hard tubes (10) is two, the two hard tubes (10) are fixedly connected to the top of the groove strip (2), and the hard tubes (10) are connected to the movable groove, and the steel purlin (1) is provided with a positioning groove adapted to the hard tube (10); The positioning strip (11) is fixed on the top of the groove strip (2), and the inner wall of the installation groove is provided with a limiting groove that matches the positioning strip (11).

6. The steel structure supporting structure for an assembled deep foundation pit according to claim 5, characterized in that: It also includes a rectangular steel structure frame, the rectangular steel structure frame including a reinforcement bar (12) and a triangular brace (13); the number of the reinforcement bar (12) and the triangular brace (13) is four, the four triangular braces (13) are respectively located at the four corners of the rectangular steel structure frame, and the two ends of the reinforcement bar (12) are respectively connected to the triangular braces (13) at the two corners; The steel perimeter purlin (1) is installed on the outside of the reinforcement strip (12).

7. The steel structure supporting structure for an assembled deep foundation pit according to claim 6, characterized in that: A threaded rod (14) is fixedly connected to the side of the groove bar (2) away from the force applying block (3); one end of the threaded rod (14) passes through the steel purlin (1) and the reinforcement bar (12) in sequence; and a locking nut (15) is threadedly sleeved on the end of the threaded rod (14).

8. The steel structure supporting structure for an assembled deep foundation pit according to claim 7, characterized in that: The rectangular steel structure frame further comprises a mounting tube (16), a support rod (17) and a driving mechanism; the support rods (17) are slidably inserted at both ends of the mounting tube (16), and the axes of the mounting tube (16) and the support rod (17) coincide with each other; The driving mechanism is used to drive the support rod (17) to slide in the installation cylinder (16).

9. The steel structure supporting structure for an assembled deep foundation pit according to claim 8, characterized in that: The driving mechanism comprises a double-axis hydraulic cylinder (18) and a stabilizing plate (19); the double-axis hydraulic cylinder (18) is fixedly mounted in a mounting tube (16), the stabilizing plate (19) is fixedly mounted in a support rod (17), and two output shafts of the double-axis hydraulic cylinder (18) are respectively fixedly connected to two stabilizing plates (19).

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