A positioning auxiliary device for laying prefabricated columns in a track inspection pit

Abstract

The present invention relates to the technical field of track laying, and discloses a positioning auxiliary device for laying prefabricated columns in a track inspection pit. The design includes a center positioning frame, the center positioning frame includes a base and a clamp, the base is composed of at least three L-shaped rod frames, each of the L-shaped rod frames includes a vertical rod body and a horizontal rod body, the vertical rod bodies of the multiple L-shaped rod frames are clamped by the clamp, and after the prefabricated column is placed on the center fixed frame, the vertical rod body is inserted into the cylindrical cavity of the prefabricated column. The center positioning frame is used to prevent the prefabricated column from tipping over during initial installation, and the initial installation and positioning of the prefabricated column can be easily completed. The center positioning frame extends into the inner cylindrical cavity of the prefabricated column. After the cement in the cylindrical cavity solidifies, the reinforced concrete structure formed by the vertical rod body, the extended steel bars and the cement can greatly enhance the installation strength of the prefabricated column.

Description

Technical Field

[0001] The present invention relates to the technical field of track laying, and in particular to a positioning auxiliary device for laying prefabricated columns in a track inspection pit. Background Art

[0002] In rail transit construction, track inspection pits are crucial facilities for train inspection and maintenance. Precast columns, key components of the inspection pit structure, have a crucial impact on track stability and safe train operation. During precast column installation, their accuracy directly impacts the stability and load-bearing capacity of the entire structure. Precise installation ensures column stability under various loads, preventing structural instability caused by column shifting or tilting.

[0003] Currently, when installing prefabricated columns, a scaffolding structure is first constructed to assist in positioning. When placing the prefabricated columns, the assembled structure forms a rectangular frame above the installation location of each prefabricated column. The prefabricated columns are initially positioned within this rectangular frame, and the frame prevents the prefabricated columns from tipping over. After the initial placement of the prefabricated columns, rails are installed above them and between them. The rails are then fine-tuned to ensure the verticality of the prefabricated columns.

[0004] However, currently, the fine-tuning of the rails is accomplished by using multiple struts. For example, multiple vertical struts are installed at multiple locations below the track to adjust the track height, and multiple struts are installed at multiple locations between the two tracks to adjust the track spacing. The fine-tuning of the track and the installation position of the prefabricated columns below is finally completed by adjusting the multiple struts. However, such adjustment operations are complicated. Not only is the process of building the struts complicated, but the adjustment also involves the coordination between multiple struts, which is inconvenient to use. At the same time, reserved steel bars are left at the bottom of the prefabricated columns. The reserved steel bars need to be welded to the anchor steel bars to further ensure the installation strength of the prefabricated columns. However, this method of first determining the track position and then installing the prefabricated columns based on the track, before the bottom of the prefabricated columns are cast, the entirety is almost suspended below the track, and the verticality of the suspended prefabricated columns is difficult to ensure. Moreover, the suspended prefabricated columns may also cause excess torsional torque on the track above. Summary of the Invention

[0005] The present invention aims to provide a positioning auxiliary device for laying prefabricated columns in a track inspection pit, so as to solve the problem that the auxiliary positioning tools are inconvenient to use when installing the prefabricated columns in the existing inspection pit.

[0006] The present invention is achieved through the following technical solutions:

[0007] A positioning auxiliary device for laying prefabricated columns in a track inspection pit, comprising a central positioning frame, the central positioning frame comprising a frame body and a clamping member, the frame body being composed of at least three L-shaped rod frames, each of the L-shaped rod frames comprising a vertical rod body and a horizontal rod body, the vertical rod bodies of the plurality of L-shaped rod frames being clamped by the clamping member, and after the prefabricated column is placed on the central fixed frame, the vertical rod bodies are inserted into the cylindrical cavity of the prefabricated column;

[0008] An adjustment mechanism includes a plate seat, a U-shaped holder, a prismatic screw, a first nut and a ball. The U-shaped holder is fixed on the plate seat, and the prismatic screw slides with the U-shaped holder. The prismatic screw is provided with an arc surface, and a thread is provided on the arc surface. The prismatic screw is threadedly connected with a first nut, and a ball pit is provided on the top of the prismatic screw, and a ball rolling in the ball pit.

[0009] In a possible design, the plate seat is fixed at a right-angle bend of the L-shaped rod frame to improve the structural strength of the L-shaped rod frame.

[0010] In a possible design, the adjustment mechanism also includes a second nut and a top sleeve, which are arranged at the top end of the prismatic screw, the second nut and the top sleeve are threadedly connected to the prismatic screw, the upper surface of the second nut is in spherical contact with the lower surface of the top sleeve, the top sleeve is made of magnetic material, the ball is arranged between the top sleeve and the ball pit, and the top sleeve is lowered to make the ball emerge from the hole at the upper end of the top sleeve above the upper surface of the top sleeve, and the inner hole diameter of the top sleeve is larger than the diameter of the arc area of ​​the prismatic screw.

[0011] In a possible design, a plurality of clamps are fixedly provided in the axial direction of the vertical rod body, and the clamps include clamp sleeves and extended steel bars. The clamp sleeves are used to tighten the plurality of vertical rod bodies, and the plurality of extended steel bars are fixed on the clamp sleeves.

[0012] In a possible design, the outgoing steel bars are threaded steel bars, and the L-shaped rod frame is formed by bending the threaded steel bars.

[0013] In a possible design, a pointed positioning rod is fixedly provided at the middle position of the plurality of vertical rods, and the bottom of the pointed positioning rod is a conical tip.

[0014] In a possible design, a laser positioning mechanism is further included, and the laser positioning mechanism includes two target pieces with holes and a target stand.

[0015] In one possible design, the perforated target piece includes an annular frame, a target piece and a laser positioning hole, the target piece is fixed in the annular frame, the target frame includes a first connecting rod, a second connecting rod and a socket, two sockets are fixed at both ends of the second connecting rod, the middle position of the first connecting rod is fixed to the middle position of the second connecting rod, two support rods are fixed at both ends of the first connecting rod, and the annular frame is fixed on the support rods.

[0016] In a possible design, an electric control mechanism is further included. An electric control mechanism is provided at each adjustment mechanism. Multiple electric control mechanisms are electrically connected to the same controller. The lifting and vertical adjustment of the prefabricated column can be completed through the controller. The electric control mechanism includes a drive component and a connection component.

[0017] In one possible design, the drive assembly includes an eccentric shaft reducer and a drive motor, the eccentric shaft reducer is fixedly connected to the body of the drive motor, the connecting assembly includes a gear meshing retainer, a driving gear and two nut-engaging half teeth, the two nut-engaging half teeth are symmetrically assembled to form a hexagonal hole in the middle, the gear meshing retainer is provided with two circular holes, the two circular holes intersect, and at the intersection position the driving gear meshes with the outer side of the nut-engaging half teeth, the driving gear is fixed on the output shaft of the eccentric shaft reducer, the gear meshing retainer is fixed to the eccentric shaft reducer, and the gear meshing retainer is provided with an opening on the side away from the eccentric shaft reducer.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. The present invention can complete the preliminary positioning of the prefabricated columns and the anti-dumping effect after placement through the center positioning frame, without the need to install a complex scaffolding structure, thereby improving the convenience of installing and positioning the prefabricated columns. The center positioning frame is fixed with an adjustment mechanism that can easily complete the preliminary installation positioning of the prefabricated columns and the subsequent fine-tuning process. The adjustment is convenient and simple, and can complete both the height adjustment of the prefabricated columns and the verticality adjustment of the prefabricated columns.

[0020] 2. The center positioning frame of the present invention extends into the inner cylindrical cavity of the prefabricated column. After the cement in the cylindrical cavity solidifies, the reinforced concrete structure formed by the vertical rod and the extended steel bars and cement can greatly enhance the installation strength of the prefabricated column, further enhance the structural strength of the prefabricated column after installation in the inspection pit, and improve the construction quality.

[0021] 3. The adjustment mechanism on the central positioning seat can also cooperate with the electric control mechanism. An electric control mechanism is provided at each adjustment mechanism. Multiple electric control mechanisms are electrically connected to the same controller, so that the lifting and vertical adjustment of the prefabricated columns can be completed through the controller. After the prefabricated columns are hoisted onto the central positioning seat, only one worker is needed to easily and safely complete the installation and commissioning of the prefabricated columns, which can effectively reduce labor intensity and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0023] Figure 1 This is a structural diagram of the center positioning frame and the adjustment mechanism in an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of an adjustment mechanism in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the present invention when it is combined with a prefabricated column;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 This is a cross-sectional view of the prefabricated column and the center positioning frame in the present invention;

[0028] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0029] Figure 7 A schematic diagram for determining the initial installation position of the center positioning frame;

[0030] Figure 8 Schematic diagram of the center positioning bracket after initial installation position;

[0031] Figure 9 It is a structural diagram of the electric control mechanism, the center positioning frame and the adjustment mechanism;

[0032] Figure 10 It is a structural diagram of the electric control mechanism and the adjustment mechanism after coordination;

[0033] Figure 11 For Figure 10 Schematic diagram of the structure after the electric control mechanism and the adjustment mechanism cooperate in the opposite viewing angle state;

[0034] Figure 12This is a schematic diagram of the structure after the electric control mechanism and the adjustment mechanism cooperate in a top view.

[0035] The reference numerals represent: 1-L-shaped rod frame, 101-vertical rod body, 102-horizontal rod body, 2-plate seat, 3-clamp sleeve, 4-outlet steel bar, 5-U-shaped socket, 6-prismatic screw, 601-arc surface, 7-first nut, 8-second nut, 9-top sleeve, 10-ball, 11-ball pit, 12-annular frame, 13-target plate, 14-laser positioning hole, 15-support rod, 16-first connecting rod, 17-second connecting rod, 18-socket, 19-pointed positioning rod, 20-eccentric shaft reducer, 21-drive motor, 22-gear meshing retaining frame, 2201-opening, 23-driving gear, 24-nut clamping half tooth, 25-fixed socket. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1. First of all, it should be noted that the existing prefabricated columns are formed by molds. The mold not only has a side mold part but also a core rod part. The core rod can produce a cylindrical cavity in the middle of the produced prefabricated column, which can effectively reduce the weight of the prefabricated column and reduce the overall weight to facilitate transportation and lifting. At the same time, it will not reduce the structural strength of the prefabricated column. Based on this, this embodiment designs a positioning auxiliary device for laying prefabricated columns in a track inspection pit.

[0038] like Figures 1 to 3 As shown, this embodiment includes a center positioning frame, an adjustment mechanism and a top laser positioning mechanism, the center positioning frame includes a base body and a clamping member, the base body is composed of at least three L-shaped rod frames 1, each of the L-shaped rod frames 1 includes a vertical rod body 101 and a horizontal rod body 102, the vertical rod bodies 101 of multiple L-shaped rod frames 1 are clamped by the clamping member, each of the L-shaped rod frames 1 can be rotated around the axis direction of its own vertical rod body 101, and rotating the horizontal rod body 102 can enable each horizontal rod body 102 to contact the anchor steel bar, and then the anchor steel bar and the horizontal rod body 102 are welded at the contact position to complete the fixed installation of the center positioning frame.

[0039] It should be noted that after the prefabricated column is placed on the central fixed seat, the vertical rod 101 is inserted into the cylindrical cavity of the prefabricated column, and each horizontal rod 102 of the central fixed seat is welded to the anchor steel bar, so that the positioning of the prefabricated column and the anti-dumping function after placement can be completed only through the central fixed seat, and there is no need to build a cumbersome scaffolding, which can effectively reduce the complexity of construction and improve construction efficiency.

[0040] In this embodiment, a plurality of clamps are fixedly provided in the axial direction of the vertical rod body 101, and the clamps include a clamp sleeve 3 and an outgoing steel bar 4. The clamp sleeve 3 is used to tighten the plurality of vertical rod bodies 101. A plurality of outgoing steel bars 4 are fixed on the clamp sleeve 3. One end of the outgoing steel bar 4 is fixedly connected to the clamp sleeve 3. The outgoing steel bar 4 is a threaded steel bar. During the process of pouring cement for the prefabricated column, the vertical rod is located in the cylindrical cavity of the prefabricated column. A plurality of clamp sleeves 3 are also fixed on the rod body 101, and a plurality of outgoing steel bars 4 are also fixed on the clamp sleeves 3. After cement is poured into the cylindrical cavity and the cement solidifies, a reinforced cement structure with the vertical rod body 101 and the outgoing steel bars 4 as the steel skeleton is formed in the cylindrical cavity, which can greatly enhance the installation strength of the prefabricated column. Compared with the existing prefabricated column installation method, the installation strength of the prefabricated column in the track inspection pit can be greatly improved, ensuring that the prefabricated column can withstand a larger load and improving the construction quality.

[0041] In a simple embodiment, the clamp sleeve is formed by winding a plurality of iron wires, and the outgoing steel bars are inserted between the plurality of iron wires.

[0042] During fine-tuning, adjustment is performed through an adjustment mechanism, which includes a plate seat 2, which is fixed at the right-angle bend of the L-shaped rod frame 1 to improve the structural strength of the L-shaped rod frame 1. The adjustment mechanism also includes a U-shaped holder 5, a prismatic screw 6, a first nut 7 and a ball 10. The U-shaped holder 5 is fixed on the plate seat 2, and the U-shaped holder 5 cooperates with the plate seat 2 to form a rectangular hole. The prismatic screw 6 slides with the U-shaped holder 5 in the rectangular hole. A circular arc surface 601 is provided on the prismatic screw 6, and a thread is provided on the circular arc surface 601. The first nut 7 is threadedly connected to the prismatic screw 6, and a ball pit 11 is provided on the top of the prismatic screw 6. A ball 10 is rolled in the ball pit 11.

[0043] The prefabricated columns placed on the central positioning frame can be adjusted through multiple adjustment mechanisms, including verticality adjustment and height adjustment. This embodiment provides an implementation scheme including four adjustment mechanisms. By adjusting only one to three of the adjustment mechanisms, the tilt state of the prefabricated columns can be adjusted, thereby adjusting the verticality of the prefabricated columns, so that each prefabricated column maintains a high vertical state, thereby ensuring the installation quality of the prefabricated columns. Each adjustment mechanism is equipped with a ball 10 on the top. When the prefabricated column is adjusted to the vertical state, the staff can easily push the prefabricated column to move on the horizontal plane. Especially during fine adjustment, the left and right, front and back position adjustment of the prefabricated column can be easily completed, and the gauge between two prefabricated columns can also be easily completed. The adjustment is simple. The horizontal rod 102 is welded to the anchor steel bars, and the vertical rod 101 is located in the cylindrical cavity of the prefabricated column. This ensures the safety of the workers during fine-tuning. Even if the prefabricated column is forcibly pushed, it is almost impossible to push down the prefabricated column by manpower. This avoids safety accidents for the workers caused by the collapse of the prefabricated column during adjustment.

[0044] Advantageously, the adjustment mechanism further comprises a second nut 8 and a top sleeve 9, wherein the first nut 7 is located above the U-shaped card seat 5 and maintains contact with the U-shaped card seat 5, the second nut 8 and the top sleeve 9 are arranged at the top end of the prismatic screw 6, the second nut 8 is located above the first nut 7, the second nut 8 is threadedly connected to the prismatic screw 6, the upper surface of the second nut 8 is in spherical contact with the lower surface of the top sleeve 9, the top sleeve 9 is a magnetic material and can be adsorbed on the second nut 8 made of iron, the ball 10 is arranged between the top sleeve 9 and the ball pit 11, and lowering the top sleeve 9 can make the ball 10 move from the upper end of the top sleeve 9 The hole is exposed above the upper surface of the top sleeve 9. The inner diameter of the top sleeve 9 is larger than the diameter of the arc area of ​​the prismatic screw 6. The top of the top sleeve 9 is a torus. After the prefabricated column is fine-tuned, the second nut 8 is rotated to move the second nut 8 upward. The second nut 8 pushes the top sleeve 9 upward. The top sleeve 9 is in spherical contact with the second nut 8. The torus on the top of the top sleeve 9 will automatically fit with the bottom plane of the prefabricated column, thereby completing the contact with the bottom of the prefabricated column through the top sleeve 9. At this time, the prefabricated column and the adjustment mechanism can be kept fixed by friction, so that the prefabricated column cannot be easily moved after the position adjustment is completed, and the prefabricated column maintains its adjusted state.

[0045] In a possible embodiment, the L-shaped rod frame 1 is formed by bending threaded steel bars. After cement grouting of the prefabricated column, the bonding strength between the L-shaped rod frame 1 and the cement can also ensure better welding properties between the L-shaped rod frame 1 and the anchor steel bars during welding.

[0046] In this embodiment, a pointed positioning rod 19 is fixedly provided at the middle position of the plurality of vertical rod bodies 101. The bottom of the pointed positioning rod 19 is a conical tip. The positioning of the central fixed seat frame is completed by the tip of the pointed positioning rod 19. After the positioning of the pointed positioning rod 19 is completed, the horizontal rod body 102 is rotated to make the horizontal rod body 102 contact with the anchor steel bar and then welded, which can complete the positioning and installation of the central fixed seat frame more quickly and effectively.

[0047] Example 2: This implementation is based on Example 1. Figure 3 and Figure 4 As shown, the laser positioning mechanism includes two target pieces with holes and a target stand, the target piece with holes includes an annular stand 12, a target piece 13 and a laser positioning hole 14, the target piece 13 is fixed in the annular stand 12, the target stand includes a first connecting rod 16, a second connecting rod 17 and a socket 18, two sockets 18 are fixed at both ends of the second connecting rod 17, the middle position of the first connecting rod 16 is fixed to the middle position of the second connecting rod 17, two support rods 15 are fixed at both ends of the first connecting rod 16, the annular stand 12 is fixed on the support rod 15, the laser emitted by the laser is used to form a straight line, and a laser positioning mechanism is installed on the top of each prefabricated column, the position of the prefabricated column is adjusted, and the position of the laser projected on the target piece 13 is observed. When the laser on the prefabricated column passes through the two laser positioning holes 14 at the same time, it indicates that the prefabricated column is installed in place.

[0048] Working principle;

[0049] refer to Figures 5 to 8 , first mark the initial installation position of each prefabricated column at the inspection pit position, the distribution position of the anchor steel bars is evenly distributed, and the initial installation position of the prefabricated column is determined by the position of the anchor steel bars and marked, such as Figure 7 and Figure 8 As shown, the initial installation position can be quickly confirmed by the position of the anchor steel bar, and then the center fixed seat is placed at the marked position, so that the tip of the pointed positioning rod 19 is aligned with the center of the mark, and the center fixed seat is placed. Each horizontal rod body 102 in the center fixed seat is rotated to a state of overlapping with an anchor steel bar, and then the horizontal rod body 102 is welded to the anchor steel bar.

[0050] After the installation of the central fixed seat is completed, the prefabricated column is placed on the central fixed seat by hoisting equipment, and a laser positioning mechanism is installed on the top of the prefabricated column. Two laser transmitters are installed on the rails at one end of the inspection pit, and the two beams of light between the laser transmitters are adjusted to be parallel, and the distance between the two parallel beams of light is equal to the track gauge.

[0051] The column is fine-tuned through the adjustment mechanism, and the 7 in each adjustment mechanism is rotated in turn to drive the laser through the two laser positioning holes 14 at the top of the prefabricated column, indicating that the fine-tuning is completed. The second nut 8 is rotated to make the top sleeve 9 abut against the bottom of the column, so that the prefabricated column can no longer be easily moved. Then, the reserved steel bars at the bottom of the prefabricated column are welded to the anchor steel bars. The high-precision positioning of the prefabricated column is completed, and then cement is poured at the bottom of the prefabricated column. A connecting hole is provided between the top of the cylindrical cavity inside the prefabricated column and the top of the prefabricated column. The cement slurry at the bottom of the prefabricated column is sucked from the top of the connecting hole through the negative pressure adsorption device, so that the cement slurry fills the cylindrical cavity. The reinforced skeleton structure formed by the combination of the cement in the cylindrical cavity, the clamp sleeve 3 and the vertical rod body 101 forms a reinforced concrete support structure with high structural strength inside the prefabricated column, further strengthening the overall structural strength of the prefabricated column after installation.

[0052] Example 3, as Figures 9 to 12 As shown, this embodiment is based on the first embodiment. In the first embodiment, when adjusting the installation height, multiple people are required to adjust multiple adjustment mechanisms at the same time, or one person needs to adjust multiple adjustment mechanisms multiple times, which is troublesome. Based on this, an electric control mechanism is further provided, and the electric control mechanism includes a drive assembly and a connection assembly;

[0053] The drive assembly includes an eccentric shaft reducer 20 and a drive motor 21. The eccentric shaft reducer 20 is fixedly connected to the body of the drive motor 21. The motor shaft of the drive motor 21 is decelerated by the eccentric shaft reducer 20 and then increases the torque output.

[0054] The connecting assembly includes a gear meshing holder 22, a driving gear 23 and two nut-engaging half teeth 24. The two nut-engaging half teeth 24 are symmetrically assembled to form a hexagonal hole in the middle. The gear meshing holder 22 is provided with two circular holes, which intersect with each other, so that the driving gear 23 is engaged with the outer side of the nut-engaging half teeth 24 at the intersection position. The driving gear 23 is fixed on the output shaft of the eccentric shaft reducer 20, and the gear meshing holder 22 is fixed to the eccentric shaft reducer 20. An opening 2201 is provided on the side of the gear meshing holder 22 away from the eccentric shaft reducer 20. The prismatic screw 6 can be horizontally inserted into the circular hole in the gear meshing holder 22 through the opening 2201, that is, after a prefabricated column is placed on the top of the prismatic screw 6, the prismatic screw 6 can be inserted into the circular hole in the gear meshing holder 22 through the opening 2201. The gear meshing holder 22 can make the prismatic screw 6 be in the gear meshing holder 22 in a horizontal moving state. The hexagonal hole after the two nut clamping half teeth 24 are spliced ​​together has the same outer diameter as the first nut 7. By placing the first nut 7 between the two nut clamping half teeth 24, and then splicing the two nut clamping half teeth 24, and then inserting the two nut clamping half teeth 24 into the circular hole in the gear meshing holder 22, the nut clamping half teeth 24 are engaged with the driving gear 23. In this way, the rotation of the first nut 7 can be controlled by the driving assembly to control the lifting and lowering of the prismatic screw 6, and then the adjustment of the prefabricated column is completed. An electric control mechanism is provided at each adjustment mechanism, and multiple electric control mechanisms are electrically connected to the same controller. Therefore, the lifting and lowering and vertical adjustment of the prefabricated column can be completed through the controller, and the adjustment is more convenient and labor-saving. The entire electric control mechanism is easy to install and is also more convenient to disassemble after installation. After the prefabricated columns are hoisted onto the central positioning seat, only one worker is needed to easily and safely complete the installation and commissioning of the prefabricated columns, which can effectively reduce labor intensity and improve construction efficiency. At the same time, the installation and positioning of the prefabricated columns can be accurately completed. Compared with the current construction method of first positioning the track and then installing the prefabricated columns, this method will not cause track torsion caused by the prefabricated columns.

[0055] Furthermore, two fixed retaining seats 25 are fixed below the gear engagement retainer 22. When the U-shaped retaining seat 5 is placed between the two fixed retaining seats 25, the gear engagement retainer 22 and the U-shaped retaining seat 5 are fixedly engaged. Furthermore, the width of the opening 2201 is not less than the lowest width of the prismatic screw 6 and is not greater than the diameter of the nut engaging half tooth 24.

[0056] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A positioning auxiliary device for laying prefabricated columns in a track inspection pit, characterized in that: include, A central positioning frame, the central positioning frame includes a frame body and a clamping member, the frame body is composed of at least three L-shaped rod frames (1), each of the L-shaped rod frames (1) includes a vertical rod body (101) and a horizontal rod body (102), the vertical rod bodies (101) of the plurality of L-shaped rod frames (1) are clamped by the clamping member, and after the prefabricated column is placed on the central fixed frame, the vertical rod body (101) is inserted into the cylindrical cavity of the prefabricated column; An adjustment mechanism, the adjustment mechanism includes a plate seat (2), a U-shaped card seat (5), a prismatic screw (6), a first nut (7) and a ball (10), the U-shaped card seat (5) is fixed on the plate seat (2), the prismatic screw (6) and the U-shaped card seat (5) are slidably matched, the prismatic screw (6) is provided with an arc surface (601), the arc surface (601) is provided with a thread, the prismatic screw (6) is threadedly connected with a first nut (7), the first nut (7) is located above the U-shaped card seat (5) and keeps contact with the U-shaped card seat (5), the top of the prismatic screw (6) is provided with a ball pit (11), and a ball (10) is rolled in the ball pit (11); The adjustment mechanism also includes a second nut (8) and a top sleeve (9), the second nut (8) and the top sleeve (9) are arranged at the top end of the prismatic screw (6), the second nut (8) and the prismatic screw (6) are threadedly connected, the upper surface of the second nut (8) and the lower surface of the top sleeve (9) are in spherical contact, the top sleeve (9) is made of magnetic material, the ball (10) is arranged between the top sleeve (9) and the ball pit (11), and the top sleeve (9) is adjusted downward so that the ball (10) is exposed from the hole at the upper end of the top sleeve (9) and is higher than the upper surface of the top sleeve (9), and the inner hole diameter of the top sleeve (9) is larger than the arc area diameter of the prismatic screw (6).

2. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 1, characterized in that: The plate seat (2) is fixed at the right-angle bend of the L-shaped rod frame (1) and is used to improve the structural strength of the L-shaped rod frame (1).

3. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 1, characterized in that: A plurality of clamping members are fixedly provided in the axial direction of the vertical rod body (101), and the clamping members include a clamping sleeve (3) and a protruding steel bar (4). The clamping sleeve (3) is used to tighten the plurality of vertical rod bodies (101), and the plurality of protruding steel bars (4) are fixed on the clamping sleeve (3).

4. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 3, characterized in that: The outgoing steel bar (4) is made of threaded steel bar, and the L-shaped rod frame (1) is formed by bending the threaded steel bar.

5. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 1, characterized in that: A pointed positioning rod (19) is fixedly provided at the middle position of the plurality of vertical rod bodies (101), and the bottom of the pointed positioning rod (19) is a conical tip.

6. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 2, characterized in that: It also includes a laser positioning mechanism, which includes two target pieces with holes and a target stand.

7. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 6, characterized in that: The target with holes includes an annular frame (12), a target piece (13) and a laser positioning hole (14); the target piece (13) is fixed in the annular frame (12); the target frame includes a first connecting rod (16), a second connecting rod (17) and a socket (18); two sockets (18) are fixed at both ends of the second connecting rod (17); the middle position of the first connecting rod (16) is fixed to the middle position of the second connecting rod (17); two support rods (15) are fixed at both ends of the first connecting rod (16); the annular frame (12) is fixed on the support rods (15).

8. The positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 1, characterized in that: It also includes an electric control mechanism. An electric control mechanism is provided at each adjustment mechanism. Multiple electric control mechanisms are electrically connected to the same controller. The lifting and vertical adjustment of the prefabricated column can be completed through the controller. The electric control mechanism includes a drive component and a connection component.

9. A positioning auxiliary device for laying prefabricated columns in a track inspection pit according to claim 8, characterized in that: The driving assembly includes an eccentric shaft reducer (20) and a driving motor (21). The eccentric shaft reducer (20) is fixedly connected to the body of the driving motor (21). The connecting assembly includes a gear meshing holder (22), a driving gear (23) and two nut-engaging half teeth (24). The two nut-engaging half teeth (24) are symmetrically assembled to form a hexagonal hole in the middle. The gear meshing holder (22) is provided with two circular holes, which intersect with each other. At the intersection position, the driving gear (23) meshes with the outer sides of the nut-engaging half teeth (24). The driving gear (23) is fixed to the output shaft of the eccentric shaft reducer (20). The gear meshing holder (22) is fixed to the eccentric shaft reducer (20). The gear meshing holder (22) is provided with an opening (2201) on the side away from the eccentric shaft reducer (20).

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