An assembled support pile structure for foundation pit support and a method of using the same
By using prefabricated support pile structures and hydraulic drive and tension adjustment, the problems of complex construction and high safety risks in traditional foundation pit support are solved, and a fast and stable foundation pit support effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 湖北道泽勘测设计院有限公司
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional foundation pit support technology requires a large number of piles to be driven in soft foundation pits, and the bottom of the support piles at the corner positions is severely disturbed, resulting in complex construction and high safety risks.
The prefabricated support pile structure includes mold connectors, spliced top support beams, inclined bracing piles, lower support frame, lifting hydraulic cylinders, drive components, and traction rods. Top support is achieved through hydraulic drive and tension adjustment, reducing construction difficulty and improving stability.
It reduces construction complexity and cost, improves the stability and safety of foundation pit corners, and is suitable for rapid support under complex conditions.
Smart Images
Figure CN122190264A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building engineering technology, and in particular to a prefabricated support pile structure for foundation pit support and its application method. Background Technology
[0002] Foundation pit support is a very traditional and relatively mature technology in construction engineering. Its purpose is to prevent the soil or other building structures on the side walls of the foundation pit from collapsing inward due to the loss of their original support after the foundation pit is excavated. Therefore, it is necessary to support the foundation pit with formwork and support piles to avoid collapse and ensure the safety of foundation pit operations.
[0003] In the traditional process, templates are attached to the foundation pit wall, and then one end of the support pile abuts against the template and the other end abuts against the bottom of the foundation pit to provide diagonal support. In an ideal state, by reasonably setting the distribution spacing and support angle, the collapse of the foundation pit wall can be effectively avoided. However, several problems exist in actual engineering. For soft soil foundation pits, a large number of piles are needed to support each support point. Most of the piles need to be retrieved after the foundation pit operation is completed. This results in an excessive amount of support work in the early and later stages of the foundation pit operation, especially at the corner of the foundation pit. Because the two sides at the corner are at a certain angle, the support direction of the support piles is different, which causes the bottom of the support piles to interfere with each other. There is not enough space in the confined area to arrange the predetermined number of inclined support piles. At the same time, there is a risk of collapse association between adjacent foundation pit walls. If one side collapses, it will compress the side of the foundation pit wall and the support piles on the adjacent side, thus forming a chain reaction, causing the support piles on the adjacent side to be crushed, thereby causing the adjacent side to collapse. To address this, a prefabricated support pile structure for foundation pit support and its application method are provided. Summary of the Invention
[0004] The purpose of this invention is to provide a prefabricated support pile structure for foundation pit support and its usage method, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated support pile structure for foundation pit support, comprising: Two mold connectors are installed on two adjacent side walls of the foundation pit so that a support space is naturally formed between them; A spliced top support beam is installed between the two mold connectors, and the spliced top support beam is perpendicular to the bisecting plane of the support space; The inclined bracing pile is fixedly installed at the top corner of the support space, and the bottom end of the inclined bracing pile is inclined downward along the equally divided surface of the support space and extends to the bottom of the pit. The lower support frame is installed at the bottom of the support space to support the spliced top support beam; A lifting hydraulic cylinder is installed on the inclined support pile to adjust the distance between the two ends of the inclined support pile so that when the bottom end of the inclined support pile sinks, the top end of the inclined support pile remains in a preset position. A driving component is installed between the end of the spliced top support beam and the mold connector, and is used to drive the spliced top support beam to move horizontally along the equally spaced plane of the support space, so that the two ends of the spliced top support beam maintain a preset support force on the mold connector; A traction rod is installed between the spliced top support beam and the inclined bracing pile to provide downward and inward tension to the spliced top support beam, thereby preventing the spliced top support beam from moving outward or upward.
[0006] Preferably, the mold connector includes a template contact plate and an assembly rail fixedly installed on the outer wall of the template contact plate. Multiple anchor rods are provided through the template contact plate and the assembly rail, and the anchor rods are assembled on the foundation pit template.
[0007] Preferably, the driving component includes an anchor fixedly mounted on the assembly track, an assembly head slidably disposed on the outer wall of the anchor, a driving hydraulic cylinder fixedly mounted inside the anchor, the driving hydraulic cylinder being parallel to the setting direction of the anchor, the output end of the driving hydraulic cylinder abutting against the assembly head, and the spliced top support beam being fixedly mounted on the assembly head.
[0008] Preferably, the spliced top support beam includes multiple spliced segments. Each spliced segment includes a square steel and connecting strips fixedly installed on the upper and lower sides of the square steel. Connecting plates and sliding supports are respectively installed on the upper and lower sides of the connection between two adjacent spliced segments. A fixing bolt is provided through the square steel. Two upper and lower opposite connecting strips are fixedly installed together by fixing bolts. The connecting plate and the sliding support are fixedly installed by the fixing bolts. The sliding support is slidably mounted on the lower support frame.
[0009] Preferably, the outer wall of the assembly head is formed by cutting to form an assembly slope, the assembly slope is perpendicular to the bisecting plane of the support space, a connecting part is fixedly installed on the assembly slope, the end of the spliced top support beam is fixedly installed in the connecting part by fixing bolts, a guide groove parallel to the assembly slope is opened on the anchor, and a sliding shaft is fixedly installed on the assembly head, and the sliding shaft is slidably connected in the guide groove.
[0010] Preferably, the lower support frame includes a steel pipe scaffold, with a diagonal bracing steel pipe fixedly mounted at the bottom end of the steel pipe scaffold and a supporting steel pipe fixedly installed at the top of the steel pipe scaffold. The supporting steel pipe is parallel to the equally spaced plane of the support space, and the sliding bracket is slidably connected to the supporting steel pipe.
[0011] Preferably, the number of the spliced top support beams is not less than one set, and each set of spliced top support beams is connected to the inclined pile with a traction rod. An inclined rod is fixedly installed between two adjacent sets of spliced top support beams, and the inclined rod is fixedly installed on the square steel with bolts. The diagonal tie rod extends outwards in a horizontal direction from the bisecting plane of the support space as the center, and the angle between the diagonal tie rod and the bisecting plane of the support space increases in both directions.
[0012] Preferably, the inclined pile driving includes a top seat fixedly assembled at one end of the two sets of template contact plates. The outer wall of the top seat is formed into a supporting inclined surface by cutting. Multiple pile splicing sections connected end to end are fixedly arranged on the supporting inclined surface. For each pile splicing section, an inner cylinder and an outer cylinder are respectively installed on one side of the two sets of pile splicing sections located at the lower end of the traction rod. The inner cylinder and the outer cylinder are movably inserted. The lifting hydraulic cylinder is fixedly installed in the inner cylinder and the outer cylinder.
[0013] Preferably, the bottom end of the traction rod is movably hinged to a connecting clamp, which is fixedly assembled to the outer wall of the pile splice section by bolts, and the top end of the traction rod is movably hinged to the outer wall of the square steel.
[0014] A method for using a prefabricated support pile structure for foundation pit support includes the following steps: S1. Excavation survey to obtain the excavation support space angle, the required support length on both sides, and the depth of the excavation; S2. Material preparation: Cut the inclined surface to form the assembly slope according to the angle of the foundation pit support space; select the corresponding number of spliced top support beams according to the length to be supported on both sides, and the spacing between two adjacent spliced top support beams is 2 to 2.5m; select the corresponding number of pile splicing sections according to the depth of the foundation pit. S3. Pre-assembly: Pre-embed cast-in-place piles at the bottom of the foundation pit, then install inclined bracing piles on top of the cast-in-place piles, and then install the remaining components. S4. Start the support: First, start the drive hydraulic cylinder to push the spliced top support beam inward so that both ends of the spliced top support beam are aligned with the side wall of the foundation pit; then install the traction rod and start the lifting hydraulic cylinder so that the inclined bracing pile supports the top corner of the foundation pit, and at the same time, the spliced top support beam is anchored by the traction rod.
[0015] The technical effects and advantages of this invention are as follows: 1. This prefabricated support pile structure for foundation pit support uses a hydraulic cylinder to drive the spliced top support beam so that both ends of the beam support the mold connectors on both sides. Then, the lifting hydraulic cylinder is activated to tighten the two ends of the inclined pile with the top seat and the pile. At the same time, the traction rod pulls the spliced top support beam inward and downward to anchor it, preventing the beam from deforming or bending outward or upward during use. It provides effective double-sided support for narrow corners of the foundation pit. At this time, the compressive force caused by the downward collapse tendency of the foundation pit on both sides is converted into internal stress that interacts with the opposite side, thus canceling each other out. As long as the strength of the materials used in this device can meet the support requirements, the entire corner position has high stability on both sides.
[0016] 2. This prefabricated support pile structure for foundation pit support involves installing inclined bracing piles on the equally divided surface of the measured area. The angle and bottom position of the inclined bracing piles are determined by setting out measuring points. Then, the piles are driven into the ground, and the top seat is fixed at the top corner of the support space. Multiple pile splice sections are pre-assembled according to the distance between the top seat and the pile. A set of lifting hydraulic cylinders is installed at the bottom of the pile splice section near the pile driving position. The spliced top support beam is pulled inward and downward and anchored by the traction rod to prevent the spliced top support beam from deforming or bending outward or upward during use. Furthermore, only one pile driving point needs to be set down from the ground, reducing construction difficulty and time. It is suitable for all foundation pit corners and narrow areas.
[0017] 3. The method of using the prefabricated support pile structure for foundation pit support involves determining the construction plan through preliminary surveys. At the same time, the required support components can be prefabricated and spliced synchronously after the survey is completed, and then quickly assembled. The whole structure only requires one pile driving point. For the entire construction process, it is less difficult and has a shorter cycle. It can effectively and quickly complete the support of the foundation pit sidewall in the face of complex weather conditions and complex foundation pit conditions, with a high safety factor and low construction cost. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall outer surface structure of the present invention; Figure 2 This is a schematic diagram of the overall application state of the present invention; Figure 3 This is a top view diagram of the entire invention; Figure 4 This is a schematic diagram of the outer surface of the lower support frame of the present invention; Figure 5 This is a schematic diagram of the outer surface structure of the inclined brace pile of the present invention; Figure 6 This is a schematic diagram of the spliced top support beam of the present invention; Figure 7 This is a schematic diagram of the outer surface of the driving component of the present invention; Figure 8 This is a schematic diagram of the outer surface of the splicing segment of the present invention.
[0019] In the diagram: 1. Mold connector; 11. Template contact plate; 12. Assembly track; 13. Anchor bolt; 2. Spliced top support beam; 201. Square steel; 202. Fixing bolt; 203. Connecting strip; 204. Connecting plate; 205. Sliding bracket; 22. Driving component; 221. Anchor seat; 222. Assembly head; 223. Assembly ramp; 224. Guide groove; 225. Connecting part; 226. Driving hydraulic cylinder; 23. Diagonal tie rod; 24. Traction tie rod; 3. Diagonal bracing pile; 31. Top seat; 32. Pile column splicing section; 33. Lifting hydraulic cylinder; 34. Inner cylinder; 35. Outer cylinder; 36. Support ramp; 37. Connecting clamp; 4. Lower support frame; 41. Steel pipe scaffolding; 42. Diagonal bracing steel pipe; 43. Supporting steel pipe. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] This invention provides, for example Figures 1-8 The prefabricated support pile structure for foundation pit support shown includes two mold connectors 1, which are installed on two adjacent side walls of the foundation pit so that a support space is naturally formed between them. The spliced top support beam 2 is installed between two mold connectors 1, and the spliced top support beam 2 is perpendicular to the equally divided plane of the support space; The inclined bracing pile 3 has its top end fixedly installed at the top corner of the support space, and its bottom end is inclined downward along the equally divided surface of the support space and extends to the bottom of the pit. The lower support frame 4 is installed at the bottom of the support space and is used to support the spliced top support beam 2; The lifting hydraulic cylinder 33 is installed on the inclined support pile 3 to adjust the distance between the two ends of the inclined support pile 3 so that when the bottom end of the inclined support pile 3 sinks, the top end of the inclined support pile 3 remains in the preset position. The driving component 22 is installed between the end of the spliced top support beam 2 and the mold connecting component 1. It is used to drive the spliced top support beam 2 to move horizontally along the equally divided surface of the support space, so that the two ends of the spliced top support beam 2 maintain a preset support force on the mold connecting component 1. The traction rod 24 is installed between the spliced top support beam 2 and the inclined bracing pile 3 to provide downward and inward tension to the spliced top support beam 2, thereby preventing the spliced top support beam 2 from moving outward or upward.
[0022] The mold connector 1 includes a template contact plate 11 and an assembly rail 12 fixedly installed on the outer wall of the template contact plate 11. Multiple anchor rods 13 are provided through the template contact plate 11 and the assembly rail 12. The anchor rods 13 are assembled on the foundation pit template. In use, the template contact plate 11 is designed and cut to the target length according to the actual measured support length.
[0023] The driving component 22 includes an anchor 221 fixedly installed on the assembly rail 12. An assembly head 222 is slidably disposed on the outer wall of the anchor 221. A driving hydraulic cylinder 226 is fixedly installed inside the anchor 221. The driving hydraulic cylinder 226 is parallel to the setting direction of the anchor 221. The output end of the driving hydraulic cylinder 226 abuts against the assembly head 222. The spliced top support beam 2 is fixedly installed on the assembly head 222. By activating the driving hydraulic cylinder 226, the driving hydraulic cylinder 226 drives the assembly head 222 to slide along the guide groove 224, thereby enabling the two ends of the spliced top support beam 2 to provide top support to the mold connecting parts 1 on both sides.
[0024] The spliced top support beam 2 includes multiple spliced sections. Each spliced section includes a square steel 201 and connecting strips 203 fixedly installed on the upper and lower sides of the square steel 201. Connecting plates 204 and sliding supports 205 are respectively installed on the upper and lower sides of the connection between two adjacent spliced sections. Fixing bolts 202 are installed through the square steel 201. The two upper and lower opposite connecting strips 203 are fixedly installed by fixing bolts 202. The connecting plates 204 and sliding supports 205 are fixedly installed by fixing bolts 202. The sliding supports 205 are slidably installed on the lower support frame 4. The lower support frame 4 supports the spliced top support beam 2 to prevent it from deforming downward.
[0025] The outer wall of the assembly head 222 is cut to form an assembly slope 223. The assembly slope 223 is perpendicular to the bisecting plane of the support space. A connecting part 225 is fixedly installed on the assembly slope 223. The end of the spliced top support beam 2 is fixedly installed in the connecting part 225 by fixing bolts 202. A guide groove 224 parallel to the assembly slope 223 is opened on the anchor 221. A sliding shaft is fixedly installed on the assembly head 222 and is slidably connected in the guide groove 224 to locate the displacement direction.
[0026] The lower support frame 4 includes a steel pipe scaffold 41. The bottom end of the steel pipe scaffold 41 is fixedly equipped with a diagonal bracing steel pipe 42, and the top of the steel pipe scaffold 41 is fixedly installed with a supporting steel pipe 43. The supporting steel pipe 43 is parallel to the equally divided surface of the support space, and the sliding bracket 205 is slidably connected to the supporting steel pipe 43.
[0027] The number of spliced top support beams 2 is not less than one set, and each set of spliced top support beams 2 and inclined bracing piles 3 are respectively equipped with traction rods 24. An inclined tie rod 23 is fixedly installed between two adjacent sets of spliced top support beams 2. The inclined tie rod 23 is fixedly installed on the square steel 201 by bolts. The diagonal tie rod 23 extends outwards to both sides on the horizontal plane with the equally divided surface of the support space as the center, and the angle between the diagonal tie rod 23 and the equally divided surface of the support space increases to both sides.
[0028] The inclined pile driving 3 includes a top seat 31 fixedly assembled at one end of two sets of template contact plates 11. The outer wall of the top seat 31 is cut to form a supporting inclined surface 36. Multiple pile splicing sections 32 connected end to end are fixedly installed on the supporting inclined surface 36. On the opposite side of the two sets of pile splicing sections 32 located at the lower end of the traction rod 24, an inner cylinder 34 and an outer cylinder 35 are respectively installed. The inner cylinder 34 and the outer cylinder 35 are movably inserted. The lifting hydraulic cylinder 33 is fixedly installed in the inner cylinder 34 and the outer cylinder 35.
[0029] The bottom end of the traction rod 24 is movably hinged to a connecting clamp 37, which is fixedly assembled to the outer wall of the pile splice section 32 by bolts. The top end of the traction rod 24 is movably hinged to the outer wall of the square steel 201.
[0030] Working principle: When using this device, firstly, a site survey is conducted to determine the installation location. Then, template contact plates 11 are installed on the templates of the two side walls at the corner of the foundation pit. At the same time, assembly rails 12 are installed on the template contact plates 11. Then, the number and length of the spliced top support beams 2 are determined according to the length of the two sides of the required support area, and then they are pre-assembled. Then, according to the measured area, the inclined support piles 3 are installed on the equally divided surface. The angle and bottom position of the inclined support piles 3 are determined by setting out the measuring points. Then, the piles are installed into the ground. The piles are selected as cast-in-place type (no need to be removed later) or implanted type (removed and reused later) according to the construction type. Then, the top seat 31 is fixed on the top corner of the support space. Then, according to the distance between the top seat 31 and the pile, multiple pile splicing sections 32 are pre-assembled. A set of lifting hydraulic cylinders 33 is installed at the bottom of the pile splicing section 32 near the pile position. Then, a steel pipe scaffold 41 is erected on the ground in the area, and a supporting steel pipe 43 is fixed on the top of the steel pipe scaffold 41. At this time, the spliced top support beam 2 is placed on the top of the supporting steel pipe 43. Then, the driving component 22 is installed on the outer surface of the assembly track 12. Then, the two ends of the spliced top support beam 2 are fixed to the assembly head 222 on the driving component 22 through the connecting part 225. Then, the driving hydraulic cylinder 226 is started, so that the driving hydraulic cylinder 226 drives the assembly head 222 to slide along the guide groove 224, so that the two ends of the spliced top support beam 2 provide top support for the mold connecting parts 1 on both sides. By installing a pressure sensor on the hydraulic input pipe of the driving hydraulic cylinder 226, the pressure value of the current driving hydraulic cylinder 226 is monitored by the pressure sensor, so as to realize real-time dynamic monitoring. If the number of spliced top support beams 2 is greater than one set, then diagonal tie rods 23 are installed between adjacent sets of spliced top support beams 2. The number of diagonal tie rods 23 is determined according to the length of the longer set of spliced top support beams 2, ensuring that the number of diagonal tie rods 23 is the same as the number of spliced segments on the longer set of spliced top support beams 2, so that multiple sets of spliced top support beams 2 together form a mesh planar top support structure. At this time, a traction rod 24 is installed between the inclined bracing pile 3 and the spliced top support beam 2. After the assembly is completed, the lifting hydraulic cylinder 33 is started so that the two ends of the inclined bracing pile 3 are pressed tightly against the top seat 31 and the pile. At the same time, the spliced top support beam 2 is pulled and anchored inward and downward by the traction rod 24 to prevent the spliced top support beam 2 from deforming and bending outward or upward during use. This provides effective double-sided support for the narrow corner of the foundation pit. At this time, the squeezing force brought about by the downward collapse trend on both sides of the foundation pit is converted into internal stress that interacts with the opposite side, thus forming mutual cancellation. As long as the strength of the materials used in this device can meet the support requirements, the two sides of the entire corner position have high stability. Furthermore, only one pile driving point needs to be set down to the ground, which reduces the construction difficulty and cycle, and is suitable for all foundation pit corners and narrow areas.
[0031] Example 2, see attached document Figure 1-8 As shown, a method for using a prefabricated support pile structure for foundation pit support includes the following steps: S1. Excavation survey to obtain the excavation support space angle, the required support length on both sides, and the depth of the excavation; S2. Material preparation: Cut the assembly slope 223 according to the angle of the foundation pit support space; select the corresponding number of spliced top support beams 2 according to the length to be supported on both sides, and the spacing between two adjacent spliced top support beams 2 is 2 to 2.5m; select the corresponding number of pile splicing sections 32 according to the depth of the foundation pit. S3. Pre-assembly: Pre-embed cast-in-place piles at the bottom of the foundation pit, then install inclined bracing piles 3 on the top of the cast-in-place piles, and then install the remaining components. S4. Start the support: First, start the drive hydraulic cylinder 226 to push the spliced top support beam 2 inward so that the two ends of the spliced top support beam 2 are aligned with the side wall of the pit; then install the traction rod 24 and start the lifting hydraulic cylinder 33 so that the inclined brace pile 3 supports the top corner of the pit, and at the same time, the spliced top support beam 2 is anchored by the traction rod 24.
[0032] Working principle: In this method, the construction plan is determined through preliminary surveys. At the same time, the required supporting components can be prefabricated and spliced synchronously after the survey is completed, and then quickly assembled. The whole process only requires one pile driving point. For the entire construction process, the difficulty is small and the cycle is short. It can effectively and quickly complete the support of the foundation pit sidewall in the face of complex weather conditions and complex foundation pit conditions. It has a high safety factor and low construction cost.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A prefabricated support pile structure for foundation pit support, characterized in that, include: Two mold connectors (1) are installed on two adjacent side walls of the foundation pit so that a support space is naturally formed between them; A spliced top support beam (2) is installed between two of the mold connectors (1), and the spliced top support beam (2) is perpendicular to the bisecting plane of the support space; The inclined bracing pile (3) is fixedly installed at the top corner of the support space, and the bottom end of the inclined bracing pile (3) is inclined downward along the equally divided surface of the support space and extends to the bottom of the pit. The lower support frame (4) is installed at the bottom of the support space to support the spliced top support beam (2). A lifting hydraulic cylinder (33) is installed on the inclined support pile (3) to adjust the distance between the two ends of the inclined support pile (3) so that when the bottom end of the inclined support pile (3) sinks, the top of the inclined support pile (3) remains in a preset position. The driving component (22) is installed between the end of the spliced top support beam (2) and the mold connector (1) to drive the spliced top support beam (2) to move horizontally along the equally divided surface of the support space, thereby making the two ends of the spliced top support beam (2) maintain a preset support force on the mold connector (1); A traction rod (24) is installed between the spliced top support beam (2) and the inclined bracing pile (3) to provide downward and inward tension to the spliced top support beam (2), thereby preventing the spliced top support beam (2) from moving outward or upward.
2. The prefabricated support pile structure for foundation pit support according to claim 1, characterized in that, The mold connector (1) includes a template contact plate (11) and an assembly rail (12) fixedly installed on the outer wall of the template contact plate (11). Multiple anchor rods (13) are provided through the template contact plate (11) and the assembly rail (12). The anchor rods (13) are assembled on the foundation pit template.
3. The prefabricated support pile structure for foundation pit support according to claim 2, characterized in that, The driving component (22) includes an anchor (221) fixedly installed on the assembly rail (12). An assembly head (222) is slidably provided on the outer wall of the anchor (221). A driving hydraulic cylinder (226) is fixedly installed inside the anchor (221). The driving hydraulic cylinder (226) is parallel to the setting direction of the anchor (221). The output end of the driving hydraulic cylinder (226) abuts against the assembly head (222). The spliced top support beam (2) is fixedly installed on the assembly head (222).
4. The prefabricated support pile structure for foundation pit support according to claim 3, characterized in that, The spliced top support beam (2) includes multiple spliced sections. Each spliced section includes a square steel (201) and connecting strips (203) fixedly installed on the upper and lower sides of the square steel (201). Connecting plates (204) and sliding supports (205) are respectively installed on the upper and lower sides of the connection between two adjacent spliced sections. A fixing bolt (202) is provided through the square steel (201). The two upper and lower opposite connecting strips (203) are fixedly installed by the fixing bolt (202). The connecting plate (204) and the sliding support (205) are fixedly installed by the fixing bolt (202). The sliding support (205) is slidably installed on the lower support frame (4).
5. A prefabricated support pile structure for foundation pit support according to claim 4, characterized in that, The outer wall of the assembly head (222) is cut to form an assembly slope (223). The assembly slope (223) is perpendicular to the bisecting plane of the support space. A connecting part (225) is fixedly installed on the assembly slope (223). The end of the spliced top support beam (2) is fixedly installed in the connecting part (225) by fixing bolts (202). A guide groove (224) parallel to the assembly slope (223) is opened on the anchor (221). A sliding shaft is fixedly installed on the assembly head (222) and the sliding shaft is slidably connected in the guide groove (224).
6. A prefabricated support pile structure for foundation pit support according to claim 4, characterized in that, The lower support frame (4) includes a steel pipe scaffold (41), the bottom end of which is fixedly equipped with a diagonal bracing steel pipe (42), and the top of which is fixedly installed with a supporting steel pipe (43). The supporting steel pipe (43) is parallel to the equally spaced plane of the support space, and the sliding bracket (205) is slidably connected to the supporting steel pipe (43).
7. A prefabricated support pile structure for foundation pit support according to claim 4, characterized in that, The number of the spliced top support beams (2) is not less than one set, and each set of spliced top support beams (2) and the inclined piles (3) are respectively equipped with the traction rods (24), and the two adjacent sets of spliced top support beams (2) are fixedly installed with inclined rods (23), and the inclined rods (23) are fixedly installed on the square steel (201) by bolts; The diagonal tie rod (23) is centered on the bisecting plane of the support space and spreads outwards to both sides on the horizontal plane, and the angle between the diagonal tie rod (23) and the bisecting plane of the support space increases to both sides.
8. A prefabricated support pile structure for foundation pit support according to claim 7, characterized in that, The inclined pile driving (3) includes a top seat (31) fixedly assembled at one end of the two sets of template contact plates (11). The outer wall of the top seat (31) is formed by cutting to form a support slope (36). Multiple pile splicing sections (32) connected end to end are fixedly arranged on the support slope (36). On the two sets of pile splicing sections (32) located at the lower end of the traction rod (24), an inner cylinder (34) and an outer cylinder (35) are respectively installed on opposite sides. The inner cylinder (34) and the outer cylinder (35) are movably inserted. The lifting hydraulic cylinder (33) is fixedly installed in the inner cylinder (34) and the outer cylinder (35).
9. A prefabricated support pile structure for foundation pit support according to claim 8, characterized in that, The bottom end of the traction rod (24) is movably hinged to a connecting clamp (37), which is fixedly assembled to the outer wall of the pile splice section (32) by bolts, and the top end of the traction rod (24) is movably hinged to the outer wall of the square steel (201).
10. A method of using a prefabricated support pile structure for foundation pit support, based on the prefabricated support pile structure for foundation pit support as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Excavation survey to obtain the excavation support space angle, the required support length on both sides, and the depth of the excavation; S2. Material preparation: Cut the assembly slope (223) according to the angle of the foundation pit support space; Select the corresponding number of spliced top support beams (2) according to the length to be supported on both sides, and the spacing between two adjacent spliced top support beams (2) is 2 to 2.5 m; Select the corresponding number of pile splicing sections (32) according to the depth of the foundation pit. S3. Pre-assembly: Pre-embed cast-in-place piles at the bottom of the foundation pit, then install inclined bracing piles (3) on the top of the cast-in-place piles, and then install the remaining components. S4. Start the support. First, start the drive hydraulic cylinder (226) to push the spliced top support beam (2) inward so that the two ends of the spliced top support beam (2) are aligned with the side wall of the pit. Then, install the traction rod (24) and start the lifting hydraulic cylinder (33) so that the inclined support pile (3) supports the top corner of the pit. At the same time, the spliced top support beam (2) is anchored by the traction rod (24).