High-speed rail station foundation pit construction supporting device and construction method

Abstract

The application discloses a high-speed railway station foundation pit construction supporting device and a construction method, and particularly relates to the field of building construction. The foundation pit construction supporting device comprises a steel reinforcement cage, the steel reinforcement cage comprises a plurality of longitudinal reinforcements and stirrups wound outside the longitudinal reinforcements, the lower side of the plurality of longitudinal reinforcements is provided with ring reinforcements, a sleeve ring is jointly arranged on the plurality of longitudinal reinforcements, the sleeve ring is located between the stirrups and the ring reinforcements, and a plurality of positioning plates capable of moving along the radial direction of the sleeve ring are arranged on the circumferential direction of the outer wall of the sleeve ring. During construction, when the steel reinforcement cage is about to be lowered to the bottom of the foundation hole, the positioning plates are extended to abut against the inner wall of the foundation hole to position the steel reinforcement cage, and then the steel reinforcement cage is lowered to the bottom of the foundation hole. According to the application, the sleeve ring and the positioning plates are arranged, when the steel reinforcement cage is about to be lifted and lowered to the bottom of the foundation hole, the positioning plates are first used to support the hole wall to position the steel reinforcement cage, the steel reinforcement cage is located in the middle of the foundation hole, and then the steel reinforcement cage is completely lifted and lowered, so that the positioning is not affected by the silt or stones at the bottom of the hole, and the positioning accuracy is ensured.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a support device and construction method for the foundation pit of a high-speed railway station. Background Technology

[0002] The area surrounding the foundation pit of a high-speed railway station often connects to existing transportation lines, underground pipelines, and buildings, placing stringent requirements on the control of pit deformation. To ensure the stability of the pit walls, a reasonable foundation pit support structure needs to be designed to protect the safety of the main underground engineering construction and prevent damage to the surrounding environment.

[0003] The support structure for high-speed railway station foundation pits generally adopts either diaphragm walls or bored piles. Bored piles are the most commonly used support method, suitable for foundations in areas with weak soil or abundant groundwater that need to withstand horizontal lateral forces. During construction, a hole is first drilled according to the designed diameter and depth using drilling equipment. After cleaning the hole, a reinforcing cage is lowered, and then concrete is poured to form the pile. When lowering the reinforcing cage, a crane is used to hoist it slowly to the borehole opening for alignment, and then it is lowered slowly and evenly. After reaching the designed elevation, it is fixed to prevent the reinforcing cage from floating during concrete pouring.

[0004] However, when lowering the reinforcing cage, its axis cannot be completely aligned with the axis of the hole, resulting in a certain degree of offset. After the reinforcing cage is hoisted to the bottom of the pile hole, it will shift from the center of the pile hole. Workers will then position and adjust the upper end of the reinforcing cage, causing it to tilt to a certain extent. As a result, after the concrete is poured, the pile body will experience uneven stress. The pile body, which should have evenly borne the lateral soil pressure of the foundation pit, will experience localized stress concentration due to the offset of the reinforcing cage. This will significantly reduce the pile's bearing capacity and shear strength, making it prone to cracking, breakage, and loss of support and protection functions. Summary of the Invention

[0005] The present invention provides a support device and construction method for high-speed railway station foundation pit construction. The problem to be solved is that after the existing steel cage is hoisted to the bottom of the pile hole, it will deviate from the center of the pile hole, causing the steel cage to tilt to a certain extent.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a support device for the construction of a high-speed railway station foundation pit, comprising a steel cage, the steel cage comprising multiple longitudinal bars and stirrups wrapped around the outside of the longitudinal bars, with ring bars installed on the lower side of the multiple longitudinal bars, and a collar sleeved on the multiple longitudinal bars, the collar being located between the stirrups and the ring bars, and multiple positioning plates that can move radially along the outer wall of the collar being provided in the circumferential direction; during construction, when the steel cage is about to be lowered to the bottom of the foundation pit, the positioning plates extend out and press against the inner wall of the foundation pit to position the steel cage, and then the steel cage is lowered to the bottom of the foundation pit.

[0007] Preferably, the collar is provided with a transmission component that corresponds to the positioning plate. A counterweight component is provided at the top of the collar. The transmission component includes a slide rail fixed to the inner wall of the collar, a slider slidably mounted on the slide rail, and a push rod mounted on the slider. A connecting rod is provided between the transmission component and the counterweight component. The two ends of the connecting rod are hinged to the slider and the counterweight component, respectively. When the counterweight component falls, the push rod pushes the positioning plate to move along the radial direction of the collar.

[0008] Preferably, a guide rod is fixedly installed on one side of the positioning plate, and the guide rod passes through the side wall of the positioning plate and extends towards the inside of the collar.

[0009] Preferably, a second through hole is provided in the middle of the positioning plate, and a first through hole is provided on the side wall opposite to the second through hole of the collar. A pointed cone is fixedly installed at the front end of the push rod, with the pointed cone facing the second through hole and the first through hole. A drive ring is fixedly installed on the push rod, with the diameter of the drive ring being larger than the diameter of the second through hole but smaller than the diameter of the first through hole.

[0010] Preferably, a limiting plate is fixedly installed at one end of the guide rod near the middle of the collar, with the bottom of the limiting plate facing the side wall of the upper end of the drive ring near the middle of the collar.

[0011] Preferably, a limiting component is provided at the bottom of the slide rail. The limiting component includes a reduction motor that is fixedly installed with the slide rail. The output of the reduction motor is mounted on a bottom shaft that is rotatably installed with the slide rail. A top shaft is hinged to the upper end of the bottom shaft. The top shaft rests against the side wall of the slider. A limiting part is provided on one side of the bottom of the top shaft. The limiting part rests against the side wall of the bottom shaft.

[0012] Preferably, the counterweight assembly includes a top frame, with mounting rods hinged to both sides of the bottom of the top frame. The outer side of the bottom of the mounting rods has an inclined surface, and an elastic ring is fixedly installed between the two inclined surfaces. Counterweight blocks are supported on the two mounting rods.

[0013] Preferably, the upper surface of the top frame is provided with mounting blocks corresponding to the connecting rods one by one. The upper end of the connecting rod is hinged to the mounting block. The bottom of the mounting block is provided with a conical block. The upper surface of the top frame is provided with a conical hole. The conical block is located in the conical hole. A fixing rod is fixedly installed in the middle of the top frame. A turntable is rotatably connected to the outside of the fixing rod. Multiple pressure blocks are installed in the circumferential direction of the turntable. The pressure blocks press on one side of the upper surface of the conical block.

[0014] Preferably, a spiral groove is formed on the outer surface of the upper end of the fixed rod, a drive sleeve is sleeved on the fixed rod, the inner wall of the drive sleeve has a protrusion, the protrusion slides inside the spiral groove, a spring is pressed between the turntable and the drive sleeve, and insert rods are fixedly installed on both sides of the drive sleeve, the insert rods are vertically movably inserted into the turntable.

[0015] This invention also provides a construction method for a high-speed railway station foundation pit construction support device, which includes the following steps:

[0016] Step 1: Drill the foundation hole and prepare to hoist the steel reinforcement cage;

[0017] Step 2: Lower the reinforcing cage into the foundation hole. When the reinforcing cage is about to be lowered to the bottom of the foundation hole, stop lowering it. Extend the positioning plate and press it against the inner wall of the foundation hole to position the reinforcing cage. Then lower the reinforcing cage to the bottom of the foundation hole.

[0018] Step 3: Pour concrete to form a bored pile;

[0019] In step two, when the downward lowering stops, the distance between the bottom of the rebar cage and the bottom of the rebar cage after lowering is less than the distance between the upper surface of the collar and the bottom of the stirrup.

[0020] The technical effects and advantages of this invention are as follows: By setting a collar and a positioning plate, when the reinforcing cage is about to be lowered to the bottom of the foundation hole, the positioning plate is first used to support the reinforcing cage on the hole wall to position the reinforcing cage so that the reinforcing cage is located in the middle of the foundation hole, and then the reinforcing cage is completely lowered down. This ensures that the positioning is not affected by mud or stones at the bottom of the hole, thus guaranteeing the accuracy of the positioning. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is the front view of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the collar, transmission assembly, and counterweight assembly of the present invention;

[0024] Figure 4 This is a schematic diagram of the transmission component of the present invention;

[0025] Figure 5 This is a schematic diagram of the counterweight component of the present invention;

[0026] Figure 6 This is a cross-sectional view of the counterweight component of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the limiting component of the present invention;

[0028] Figure 8 This is a schematic diagram of the installation of the counterweight block according to the present invention;

[0029] Figure 9 This is a flowchart of the construction method of the present invention.

[0030] The attached diagram is labeled as follows: 1. Reinforcing cage; 11. Longitudinal reinforcement; 12. Stirrup; 13. Ring reinforcement; 14. Sleeve; 2. Collar; 20. Through hole one; 21. Positioning plate; 211. Through hole two; 3. Transmission assembly; 31. Slide rail; 32. Slider; 33. Connecting rod; 34. Push rod; 35. Drive ring; 36. Cone; 37. Guide rod; 38. Limiting plate; 4. Counterweight assembly; 41. Top frame; 411. Conical shape 42. Hole; 421. Mounting rod; 422. Inclined surface; 423. Elastic ring; 44. Counterweight; 45. Mounting block; 46. Conical block; 47. Fixing rod; 48. Spiral groove; 49. Turntable; 40. Pressure block; 41. Drive sleeve rod; 42. Protrusion; 43. Insert rod; 44. Spring; 55. Limiting assembly; 56. Gear motor; 57. Bottom shaft; 58. Top shaft; 59. Limiting part; 60. Auxiliary cylinder. Detailed Implementation

[0031] 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.

[0032] Refer to the instruction manual appendix Figures 1-4 A high-speed railway station foundation pit construction support device includes a steel cage 1. The steel cage 1 includes multiple longitudinal bars 11 and stirrups 12 wrapped around the outside of the longitudinal bars 11. Ring bars 13 are installed on the lower side of the multiple longitudinal bars 11. A collar 2 is sleeved on the multiple longitudinal bars 11. The collar 2 is located between the stirrups 12 and the ring bars 13 and is supported on the ring bars 13. Multiple positioning plates 21 that can move along the radial direction of the collar 2 are provided on the outer wall of the collar 2.

[0033] In this embodiment, as Figure 3 and Figure 4 As shown, the collar 2 is equipped with a transmission component 3 that corresponds one-to-one with the positioning plate 21. A counterweight component 4 is located directly above the collar 2. The transmission component 3 includes a slide rail 31 fixed to the inner wall of the collar 2. A slider 32 is slidably mounted on the slide rail 31. A push rod 34 is mounted on the slider 32. A connecting rod 33 is provided between the transmission component 3 and the counterweight component 4. The two ends of the connecting rod 33 are hinged to the slider 32 and the counterweight component 4, respectively. When the counterweight component 4 falls, the push rod 34 pushes the positioning plate 21 to move along the radial direction of the collar 2.

[0034] Furthermore, a guide rod 37 is fixedly installed on one side of the positioning plate 21. The guide rod 37 passes through the side wall of the positioning plate 21 and extends inward toward the inside of the collar 2.

[0035] It should be noted that the connecting rod 33 is inclined towards the center. When the counterweight assembly 4 falls, the counterweight assembly 4 will push the slider 32 to move on the slide rail 31. Thus, the push rod 34 can push the positioning plate 21 to move away from the center of the collar 2, that is, in the radial direction of the collar 2. At this time, the guide rod 37 slides on the collar 2 so that the positioning plate 21 presses on the side wall of the foundation hole. Multiple positioning plates 21 extend to the same length and press on the side wall of the foundation hole, so that the collar 2 is located in the middle of the foundation hole, thus achieving the purpose of positioning the steel cage 1.

[0036] In this embodiment, when the steel cage 1 is first lowered into the foundation hole, the counterweight component 4 cannot fall, so the foundation needs to be limited. Specifically, a limiting component 5 is provided at the bottom of the slide rail 31. The limiting component 5 includes a reduction motor 51 fixedly installed with the slide rail 31. The output of the reduction motor 51 is equipped with a bottom shaft 52 that is rotatably installed with the slide rail 31. A top shaft 53 is hinged to the upper end of the bottom shaft 52. The top shaft 53 rests on the side wall of the slider 32. A limiting part 54 is provided on one side of the bottom of the top shaft 53. The limiting part 54 rests on the side wall of the bottom shaft 52.

[0037] It should be noted that, as Figure 7 As shown, the geared motor 51 has a worm gear reducer, the top shaft 53 is pressed against the side wall of the slider 32, and the limiting part 54 is located on the side of the top shaft 53 away from the slider 32. Therefore, even if the slider 32 pushes the top shaft 53, the limiting part 54 presses against the upper end of the bottom shaft 52, so the top shaft 53 cannot rotate around the hinge axis with the bottom shaft 52, and thus the slider 32 cannot move. However, if the geared motor 51 drives the bottom shaft 52 and the top shaft 53 to rotate, so that the limiting part 54 is located on the side closer to the slider 32, then the top shaft 53 can rotate around the bottom shaft 52. That is to say, the slider 32 will push the top shaft 53 to rotate downward, thereby achieving the purpose of releasing the limiting part.

[0038] In this embodiment, the specific implementation method is as follows: During construction, a foundation hole is first drilled, and preparations are made to hoist the reinforcing cage 1. Before hoisting, the limiting part 54 needs to be located on the side of the top shaft 53 away from the slider 32 to prevent the slider 32 from moving. Then, the reinforcing cage 1 is hoisted into the foundation hole. When the reinforcing cage 1 is about to be lowered to the bottom of the foundation hole, the downward hoisting is stopped. The reduction motor 51 drives the bottom shaft 52 and the top shaft 53 to rotate, so that the limiting part 54 is located on the side close to the slider 32. At this time, under the action of the gravity of the counterweight assembly 4, the slider 32 is pushed to move inside the slide rail 31 through the connecting rod 33. The slider 32 drives the push rod 34 to push the positioning plate 21 to move along the radial direction of the collar 2, so that the positioning plate 21 presses on the inner wall of the foundation hole. There are four positioning plates 21, and the four positioning plates 21 extend to the same length, so that the collar 2 can be located in the middle of the foundation hole, achieving the purpose of positioning the reinforcing cage 1. Then, the reinforcing cage 1 is hoisted downward until the bottom of the reinforcing cage 1 contacts the bottom of the foundation hole and is supported stably. Finally, concrete is poured to form a bored pile.

[0039] During the upward movement of the reinforcing cage 1, the collar 2 and positioning plate 21 remain stationary, while the longitudinal reinforcement 11 moves downward relative to the collar 2. It is necessary to carefully control the timing of the positioning plate 21's extension to prevent the reinforcing cage 1 from moving too far downward after the positioning plate 21 presses against the sidewall of the foundation hole, causing the stirrups 12 to press against the upper surface of the collar 2, resulting in the collapse of the positioning plate 21 support and damage to the foundation hole. During construction, it is sufficient to ensure that the distance between the bottom of the reinforcing cage 1 and the bottom of the reinforcing cage 1 after lowering is stopped is less than the distance between the upper surface of the collar 2 and the bottom of the stirrups 12.

[0040] It should be noted that, since the surface of the longitudinal reinforcement 11 has texture, i.e., transverse ribs, in order to prevent the transverse ribs from colliding and scraping with the edge of the hole on the upper surface of the collar 2 when the steel cage 1 moves downward, causing the positioning plate 21 to be unstable, a sleeve 14 is fitted on the bottom of each longitudinal reinforcement 11 so that the sleeve 14 contacts the hole on the collar 2. Since the surface of the sleeve 14 is smooth, it moves downward relatively smoothly.

[0041] The above technical solution, by setting up a collar 2 and a positioning plate 21, first uses the positioning plate 21 to support the reinforcing cage 1 against the hole wall to position it when it is about to be lowered to the bottom of the foundation hole, so that the reinforcing cage 1 is located in the middle of the foundation hole, and then the reinforcing cage 1 is completely lowered down. This ensures that the positioning is not affected by mud or stones at the bottom of the hole, thus guaranteeing the accuracy of the positioning. It is easy to see that if the reinforcing cage 1 is completely lowered down before positioning, the bottom of the longitudinal reinforcement 11 will be inserted into the soil, which will cause problems such as inability to position or very poor positioning effect.

[0042] Refer to the instruction manual appendix Figures 1-4To ensure the stability of the positioning plate 21, the following technical solution is further proposed in this embodiment: Specifically, a second through hole 211 is provided in the middle of the positioning plate 21, a first through hole 20 is provided on the side wall of the collar 2 opposite to the second through hole 211, a pointed cone 36 is fixedly installed at the front end of the push rod 34, the pointed cone 36 is directly opposite the second through hole 211 and the first through hole 20, and a drive ring 35 is fixedly installed on the push rod 34, the diameter of the drive ring 35 is larger than the diameter of the second through hole 211 but smaller than the diameter of the first through hole 20.

[0043] It should be noted that after the limiting component 5 is released, the counterweight component 4 falls downward and drives the slider 32 to move through the connecting rod 33. Initially, the slider 32 moves at a low speed, and the pointed cone 36 extends outward from the through hole 20 and the through hole 211. When the pointed cone 36 is fully extended, the driving ring 35 contacts the side wall of the positioning plate 21 and pushes the positioning plate 21 to move. At this time, the slider 32 moves at a high speed, and the pointed cone 36 moves quickly together with the positioning plate 21, so that the pointed cone 36 can quickly insert into the inner wall of the base hole, thereby improving the stability of the positioning plate 21.

[0044] Furthermore, such as Figure 4 As shown, a limiting plate 38 is fixedly installed at one end of the guide rod 37 near the middle of the collar 2, and the bottom of the limiting plate 38 is directly opposite the side wall of the upper end of the drive ring 35 near the middle of the collar 2.

[0045] It should be noted that when the positioning plate 21 is not moving outward, the drive ring 35 rests against the side wall of the limiting plate 38, limiting the limiting plate 38 and preventing the limiting plate 38, guide rod 37, and positioning plate 21 from moving. When the slider 32 moves, the drive ring 35 moves forward first, and the limiting plate 38 moves later, so it does not affect the movement.

[0046] Refer to the instruction manual appendix Figures 1-8 The counterweight assembly 4 includes a top frame 41, with mounting rods 42 hinged to both sides of the bottom of the top frame 41. The outer side of the bottom of the mounting rods 42 has an inclined surface 421, and an elastic ring 422 is fixedly installed between the two inclined surfaces 421. Counterweight blocks 43 are supported on the two mounting rods 42.

[0047] It should be noted that, as Figure 6 As shown, the two mounting rods 42 serve to support the counterweight 43 and facilitate its installation. Since the counterweight 43 is heavy, it should not be installed simultaneously during the welding of the reinforcing cage 1. Therefore, as... Figure 8As shown, the counterweight 43 is first placed on the auxiliary cylinder 6, and then the reinforcing cage 1 is hoisted above the auxiliary cylinder 6. The mounting rod 42 is aligned with the hole in the middle of the counterweight 43 and inserted. During insertion, the inclined surface 421 contacts the edge of the hole in the counterweight 43 to facilitate entry. The two mounting rods 42 deflect towards the center, and the elastic ring 422 undergoes elastic deformation, changing from a circle to an ellipse. After the mounting rods 42 are inserted into place, under the action of the elastic ring 422, the two mounting rods 42 rotate to both sides, thereby supporting the counterweight 43. That is, the counterweight 43 can be installed without manual labor, saving manpower.

[0048] Refer to the instruction manual appendix Figures 1-8 After the steel cage 1 is hoisted, a guide pipe needs to be installed to facilitate concrete pouring. In order to prevent the counterweight component 4 from affecting the installation of the guide pipe, the following technical solution is proposed.

[0049] Specifically, the upper surface of the top frame 41 is provided with mounting blocks 44 corresponding to the connecting rods 33 one by one. The upper end of the connecting rods 33 is hinged to the mounting blocks 44. The bottom of the mounting blocks 44 is provided with a conical block 441. The upper surface of the top frame 41 is provided with a conical hole 411. The conical block 441 is located in the conical hole 411. A fixing rod 45 is fixedly installed in the middle of the top frame 41. A turntable 46 is rotatably connected to the outside of the fixing rod 45. Multiple pressure blocks 461 are installed in the circumferential direction of the turntable 46. The pressure blocks 461 press on one side of the upper surface of the conical block 441.

[0050] Furthermore, a spiral groove 451 is provided on the outer surface of the upper end of the fixed rod 45, and a drive sleeve 47 is sleeved on the fixed rod 45. The inner wall of the drive sleeve 47 has a protrusion 471, which slides inside the spiral groove 451. A spring 49 is pressed between the turntable 46 and the drive sleeve 47. Insert rods 48 are fixedly installed on both sides of the drive sleeve 47, and the insert rods 48 are vertically movably inserted into the turntable 46.

[0051] It should be noted that during the installation of the conduit, the conduit is hoisted downwards, with its bottom contacting and pressing downwards against the upper end of the drive sleeve 47. The protrusion 471 slides downwards along the spiral groove 451, causing the drive sleeve 47 to rotate. After the pressure block 461 disengages, the counterweight assembly 4 falls downwards, the conical block 441 disengages from the conical hole 411, and the four connecting rods 33 swing downwards and hang freely. The four connecting rods 33 are staggered, thus preventing the tops of the connecting rods 33 from colliding and sticking together, preventing them from hanging downwards. The conical shape of the conical block 441 and the conical hole 411 avoids the problem of the conical block 441 getting stuck in the conical hole 411. After the counterweight assembly 4 falls to the bottom of the foundation hole, no further treatment is done; concrete is poured directly after the secondary hole cleaning.

[0052] Refer to the instruction manual appendix Figure 9This embodiment provides a construction method for a high-speed railway station foundation pit construction support device. Using the aforementioned high-speed railway station foundation pit construction support device, the method includes the following steps:

[0053] Step 1: Drill the foundation hole and prepare to hoist the steel reinforcement cage 1;

[0054] Step 2: Hoist the steel cage 1 into the foundation hole. When the steel cage 1 is about to be lowered to the bottom of the foundation hole, stop hoisting it down. The positioning plate 21 extends out and presses against the inner wall of the foundation hole to position the steel cage 1. Then lower the steel cage 1 to the bottom of the foundation hole.

[0055] Step 3: Pour concrete to form a bored pile;

[0056] In step two, when the downward lifting stops, the distance between the bottom of the steel cage 1 and the bottom of the steel cage 1 after lifting is less than the distance between the upper surface of the collar 2 and the bottom of the stirrup 12.

[0057] It should be noted that in this embodiment, existing technologies are used for drilling, hole inspection, hole cleaning, guide pipe installation, secondary hole cleaning, and concrete pouring of the foundation hole.

[0058] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 support device for the construction of a high-speed railway station foundation pit, comprising a steel cage (1), wherein the steel cage (1) comprises multiple longitudinal bars (11) and stirrups (12) wrapped around the outside of the longitudinal bars (11), characterized in that: A ring bar (13) is installed on the lower side of the multiple longitudinal bars (11), and a collar (2) is sleeved on the multiple longitudinal bars (11). The collar (2) is located between the stirrup (12) and the ring bar (13). Multiple positioning plates (21) that can move along the radial direction of the collar (2) are provided on the circumferential direction of the outer wall of the collar (2). During construction, when the steel cage (1) is about to be lowered to the bottom of the foundation hole, the positioning plate (21) extends out and presses against the inner wall of the foundation hole to position the steel cage (1), and then the steel cage (1) is lowered to the bottom of the foundation hole. The collar (2) is provided with a transmission component (3) corresponding to the positioning plate (21) one by one. A counterweight component (4) is provided at the top of the collar (2). The transmission component (3) includes a slide rail (31) fixed to the inner wall of the collar (2). A slider (32) is slidably installed on the slide rail (31). A push rod (34) is installed on the slider (32). A connecting rod (33) is provided between the transmission component (3) and the counterweight component (4). The two ends of the connecting rod (33) are respectively hinged to the slider (32) and the counterweight component (4). When the counterweight component (4) falls, the push rod (34) pushes the positioning plate (21) to move along the radial direction of the collar (2). The positioning plate (21) has a through hole 2 (211) in the middle. The collar (2) has a through hole 1 (20) on the side wall opposite to the through hole 2 (211). A pointed cone (36) is fixedly installed at the front end of the push rod (34). The pointed cone (36) is directly opposite the through hole 2 (211) and the through hole 1 (20). A drive ring (35) is fixedly installed on the push rod (34). The diameter of the drive ring (35) is larger than the diameter of the through hole 2 (211) but smaller than the diameter of the through hole 1 (20).

2. The high-speed railway station foundation pit construction support device according to claim 1, characterized in that: A guide rod (37) is fixedly installed on one side of the positioning plate (21). The guide rod (37) passes through the side wall of the positioning plate (21) and extends in the direction of the inner side of the collar (2).

3. The high-speed railway station foundation pit construction support device according to claim 2, characterized in that: A limiting plate (38) is fixedly installed at one end of the guide rod (37) near the middle of the collar (2), and the bottom of the limiting plate (38) is directly opposite the side wall of the upper end of the drive ring (35) near the middle of the collar (2).

4. The high-speed railway station foundation pit construction support device according to claim 3, characterized in that: The bottom of the slide rail (31) is provided with a limiting component (5). The limiting component (5) includes a reduction motor (51) fixedly installed with the slide rail (31). The output of the reduction motor (51) is provided with a bottom shaft (52) rotatably installed with the slide rail (31). The upper end of the bottom shaft (52) is hinged with a top shaft (53). The top shaft (53) abuts against the side wall of the slider (32). A limiting part (54) is provided on one side of the bottom of the top shaft (53). The limiting part (54) abuts against the side wall of the bottom shaft (52).

5. The high-speed railway station foundation pit construction support device according to claim 1, characterized in that: The counterweight assembly (4) includes a top frame (41), with mounting rods (42) hinged to both sides of the bottom of the top frame (41). The outer side of the bottom of the mounting rod (42) has an inclined surface (421), and an elastic ring (422) is fixedly installed between the two inclined surfaces (421). A counterweight block (43) is supported on the two mounting rods (42).

6. The high-speed railway station foundation pit construction support device according to claim 5, characterized in that: The top frame (41) has mounting blocks (44) corresponding to the connecting rods (33) on its upper surface. The upper end of the connecting rods (33) is hinged to the mounting blocks (44). The bottom of the mounting blocks (44) has a conical block (441). The top frame (41) has a conical hole (411) on its upper surface. The conical block (441) is located in the conical hole (411). A fixing rod (45) is fixedly installed in the middle of the top frame (41). A turntable (46) is rotatably connected to the outside of the fixing rod (45). Multiple pressure blocks (461) are installed on the circumference of the turntable (46). The pressure blocks (461) press on one side of the upper surface of the conical block (441).

7. The high-speed railway station foundation pit construction support device according to claim 6, characterized in that: A spiral groove (451) is provided on the outer surface of the upper end of the fixed rod (45). A drive sleeve (47) is sleeved on the fixed rod (45). The inner wall of the drive sleeve (47) has a protrusion (471). The protrusion (471) slides inside the spiral groove (451). A spring (49) is pressed between the turntable (46) and the drive sleeve (47). Insert rods (48) are fixedly installed on both sides of the drive sleeve (47). The insert rods (48) are vertically movably inserted into the turntable (46).

8. A construction method for a high-speed railway station foundation pit construction support device, using a high-speed railway station foundation pit construction support device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Drill the foundation hole and prepare to hoist the steel cage (1); Step 2: Hoist the steel cage (1) into the foundation hole. When the steel cage (1) is about to be lowered to the bottom of the foundation hole, stop hoisting it down. The positioning plate (21) extends out and presses against the inner wall of the foundation hole to position the steel cage (1). Then lower the steel cage (1) to the bottom of the foundation hole. Step 3: Pour concrete to form a bored pile; In step two, when the downward lifting stops, the distance between the bottom of the steel cage (1) and the bottom of the steel cage (1) after the lifting is completed is less than the distance between the upper surface of the collar (2) and the bottom of the stirrup (12).

Images