Positioning device and method for subway station cover-digging reverse construction steel pipe concrete column

Abstract

The present application relates to the technical field of concrete construction, and more particularly to a positioning device for a top-down steel pipe concrete column in a top-down subway station, comprising a positioning mechanism, which is circumferentially combined and formed as a disc type design, and is composed of a fixed table and a movable table, the movable table is radially slidingly installed on the fixed table along the center of the disc, a plurality of identical movable balls are slidingly and elastically connected to the inner arc surface wall of the fixed table, a taper block is arranged on the outer arc surface wall of the movable table, and the taper block is inserted between the gaps between two adjacent movable balls and forms elastic contact, the present application solves the problems of insufficient vertical positioning accuracy of the steel pipe column and high construction cost of the steel pipe column installation, and the proposed positioning device can ensure the vertical lowering of the steel pipe column through the self-adaptive verticality correction of the positioning mechanism and the forced verticality correction of the adjustment mechanism, thereby improving the construction efficiency and significantly reducing the construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete construction, and particularly relates to a positioning device for a steel pipe concrete column in a top-down construction of a subway station. BACKGROUND

[0002] In the construction process of a subway station, the cover-excavation construction method is a common method. Steel pipe column installation is a very important process in the cover-excavation construction. After the pile foundation construction is completed, the steel pipe column installation needs to be performed. In the conventional technical means, the steel pipe column is generally hoisted by means of "one-point hoisting method", and then vertically inserted into the corresponding pile hole.

[0003] In the actual construction process, the state of the steel pipe column suspended in the air often changes, which is mainly caused by two reasons: first, the suspended steel pipe column is easy to swing and tilt under the action of wind force; second, in the process of descending, the vibration of the crane and the inertia effect of the gravity of the steel pipe column will cause the steel pipe column to shake. In order to ensure that the axis of the steel pipe column coincides with the axis of the pile hole, deviation measurement needs to be frequently performed.

[0004] At present, the construction method of vertically inserting the steel pipe column by the full-rotation drill machine has been widely applied. Although this method has the advantages of high efficiency and high accuracy, the full-rotation drill machine is large in size, needs to occupy a large area, and is expensive. In addition, the full-rotation drill machine is of an integrated structure, and after the steel pipe column installation is completed, the equipment is not convenient to disassemble and transfer, which will greatly increase the construction cost and also bring troubles to the operation of the construction personnel. SUMMARY

[0005] The present application aims at solving the problems in the prior art and provides a positioning device for a steel pipe concrete column in a top-down construction of a subway station.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A positioning device for a steel pipe concrete column in a top-down construction of a subway station, comprising positioning mechanisms, the number of the positioning mechanisms is set to several groups, the positioning mechanisms are circumferentially combined and form a disc type design, a vertical through hole for inserting the steel pipe column is reserved at the center of the disc, the positioning mechanism is composed of a fixed table and a movable table, the movable table is radially slidingly installed on the fixed table at the center of the disc, a plurality of identical movable balls are slidingly connected to the inner arc surface wall of the fixed table in an elastic manner, a taper block is arranged on the outer arc surface wall of the movable table, the taper block is inserted between the gaps between the adjacent two movable balls and forms elastic contact, a steel sheath A is arranged at the bottom of the fixed table, and the circumferentially distributed steel sheaths A are spliced into a complete steel casing.

[0008] In a preferred technical solution, the positioning mechanism is provided with an inclined downward support leg on the outer arc surface wall of the fixed table, and the lower end of the support leg is provided with a mounting bottom plate.

[0009] In a preferred technical solution, a radial guide groove is formed on the table top of the fixed table, and the bottom of the movable table is provided with a guide strip that is slidingly matched with the guide groove.

[0010] In a preferred technical solution, an arc-shaped slot is formed on the inner side of the fixed table along the arc surface wall, the inner slot of the arc-shaped slot is designed in a circular shape, the outer slot is designed in a rectangular shape, a plurality of identical movable balls are placed in the inner slot of the arc-shaped slot, and sliding blocks are respectively arranged outside the movable balls located at the positions of the two side edges, the sliding blocks slide along the slot of the arc-shaped slot, and the movable balls are pressed against the end faces of the sliding blocks.

[0011] In a preferred technical solution, the sliding blocks are provided with springs on the side faces facing the end walls of the arc-shaped slot, and the movable balls are in elastic contact with the springs through the sliding blocks.

[0012] In a preferred technical solution, the bottom of the positioning mechanism is respectively provided with an adjusting mechanism, the adjusting mechanism is designed in a rectangular frame, a liftable nut pair is mounted in the frame through a lead screw transmission mode, two parallel connecting rods are arranged on the side faces of the nut pair, the lower ends of the connecting rods are hingedly connected to the top of a same steel sheath B, the circumferentially distributed steel sheaths B are spliced into a complete steel casing, connecting plates are arranged on the two sides of the steel sheath B, and the adjacent steel sheaths B are stably connected through the connecting plates.

[0013] In a preferred technical solution, vertical lead screws and guide columns are arranged between the upper and lower horizontal plates of the frame, the nut pair is threadedly matched with the lead screws, and sliding holes for the guide columns to pass through are formed in the nut pair.

[0014] In a preferred technical solution, fixed supports are arranged on the side faces of the nut pair, two identical connecting rods are rotatably mounted on the fixed supports through rotating shafts, the top edges of the steel sheaths B are provided with flanges, and the lower ends of the connecting rods are rotatably mounted on the flanges.

[0015] In a preferred technical solution, the arc-shaped inner side face of each movable table is respectively provided with a pressure sensor, and a light-emitting diode for displaying the pressure signal of the pressure sensor is arranged on the bottom of each fixed table, and the light-emitting diode is controlled to be bright or dark through the pressure signal of the pressure sensor.

[0016] The beneficial effects of the present application are:

[0017] 1、When encountering gust, the column of the steel pipe column can press the movable platform on one side, so that the movable platform slides outward and causes the spring to appear elastic deformation, and when the wind force passes, the movable platform can restore the initial state under the elastic potential of the spring, at this time, the movable platform can be used to correct the steel pipe column, ensure that it is vertically lowered and installed. Through the self-adaptive verticality correction mode, the design and operation cost can be greatly reduced, and the verticality adjustment of the steel pipe column is very convenient and easy to operate.

[0018] 2、The working personnel on the site can find the verticality deviation of the steel pipe column during lowering through the on-off of the indicating lamp, determine the inclination direction of the steel pipe column, and only need to start the adjusting mechanism at the bottom of the positioning mechanism on the other side. Through the screw rod transmission mode, the nut pair is controlled to move downward, and the steel sheath B is pushed to the middle through the connecting rod, so that the mechanical forced correction of the steel pipe column can be realized, the vertical precision of the steel pipe column can be maintained, time can be saved, work efficiency can be improved, the whole adjusting process is easy to operate and intuitive to check, and is convenient for engineering application.

[0019] 3、The positioning mechanism and the adjusting mechanism arranged diagonally work together, and through the self-adaptive positioning correction and the mechanical forced correction, the steel pipe column can be always maintained in the vertical state, and the installation can be ensured to be smooth.

[0020] 4、The number of positioning mechanisms or adjusting mechanisms is any even multiple of two or three, and more positioning mechanisms and adjusting mechanisms can be designed to be applicable to correction in more directions, so that people can control the position of the steel pipe column from more directions to ensure that it is always in the vertical state.

[0021] 5、The positioning mechanism and the steel sheath at the bottom are detachable structures, which are convenient to assemble and disassemble, and after one steel pipe column is installed, it can be quickly transferred to the next location for subsequent installation operation.

[0022] 6、Avoid using large steel pipe column positioning and correction equipment, which greatly reduces the construction cost of steel pipe column installation.

[0023] In summary, the positioning device provided by the scheme solves the problems of low positioning verticality precision of the steel pipe column and high construction cost of the steel pipe column installation. The positioning device can ensure the vertical lowering of the steel pipe column through the self-adaptive verticality correction of the positioning mechanism and the forced verticality correction of the adjusting mechanism, has high construction efficiency, and can significantly reduce the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the first embodiment of the whole structure schematic view of the column positioning device provided by the present application.

[0025] Figure 2 The single positioning mechanism structure schematic view of the first embodiment of the center column positioning device proposed in the application;

[0026] Figure 3 The single positioning mechanism structure schematic view of the first embodiment of the center column positioning device proposed in the application; Figure 2 The single positioning mechanism structure schematic view of the first embodiment of the center column positioning device proposed in the application;

[0027] Figure 4 The single positioning mechanism structure schematic view of the second embodiment of the center column positioning device proposed in the application;

[0028] Figure 5 The single positioning mechanism structure schematic view of the second embodiment of the center column positioning device proposed in the application;

[0029] Figure 6 The single positioning mechanism structure schematic view of the second embodiment of the center column positioning device proposed in the application; Figure 5 The single positioning mechanism structure schematic view of the second embodiment of the center column positioning device proposed in the application;

[0030] In the figure: 1, positioning mechanism; 2, support leg; 3, mounting bottom plate; 4, fixed table; 5, movable table; 6, steel sheath A; 7, guide groove; 8, arc-shaped groove; 9, movable ball; 10, sliding block; 11, spring; 12, guide strip; 13, taper block; 14, adjustment mechanism; 15, frame; 16, lead screw; 17, guide column; 18, nut pair; 19, fixed support; 20, connecting rod; 21, flange; 22, connecting plate; 23, steel sheath B. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0032] In this embodiment 1, refer to Figures 1-3 A positioning device for a subway station cover-digging reverse construction steel pipe concrete center column, comprising a positioning mechanism 1, the number of positioning mechanisms 1 is set to several groups, the positioning mechanisms 1 are circumferentially combined and formed into a disc design, the center of the disc is reserved with a vertical through hole for inserting a steel pipe column, the positioning mechanism 1 is composed of a fixed table 4 and a movable table 5, the movable table 5 is installed on the fixed table 4 along the radial direction of the center of the disc, a plurality of same movable balls 9 are elastically connected on the inner arc surface wall of the fixed table 4 by sliding, a taper block 13 is arranged on the outer arc surface wall of the movable table 5, the taper block 13 is inserted between the gaps between the adjacent two movable balls 9 and forms elastic contact, the bottom of the fixed table 4 is provided with a steel sheath A 6, and the circumferentially distributed steel sheaths A 6 are spliced into a complete steel casing.

[0033] The drawings are combined Figure 2 The drawings are combined Figure 3As can be seen, both the fixed platform 4 and the movable platform 5 have fan-shaped surfaces, and steps for installing the movable platform 5 are cut into the surface of the fixed platform 4. The surface of the fixed platform 4 is flush with or slightly higher than the surface of the movable platform 5. (See attached image) Figure 3 As shown, a radial guide groove 7 is provided on the surface of the fixed platform 4, and a guide bar 12 is provided at the bottom of the movable platform 5 to slide along the guide groove 7. The movable platform 5 can slide along the guide groove 7 towards the fixed platform 4.

[0034] As attached Figure 3 As shown, an arc-shaped groove 8 is formed on the inner side of the fixed platform 4 along its arc-shaped wall. The inner opening of the arc-shaped groove 8 is designed to be circular, and the outer opening is designed to be rectangular. Several identical movable balls 9 are placed in the inner opening of the arc-shaped groove 8. At the same time, sliding blocks 10 are respectively provided on the outer side of the movable balls 9 located at the two side edges. The sliding blocks 10 slide along the groove of the arc-shaped groove 8, and the movable balls 9 press against the end face of the sliding blocks 10. A spring 11 is provided on the side of the sliding blocks 10 facing the end wall of the arc-shaped groove 8. The movable balls 9 form elastic contact with the springs 11 through the sliding blocks 10.

[0035] When the movable platform 5 is subjected to force and slides in a direction away from the radial center, the cone block 13 on the outer wall of the movable platform 5 will be inserted between the two movable balls 9 in the arc groove 8, and the movable balls 9 will be squeezed to both sides. During the process of sliding to both sides, the movable balls 9 will squeeze the spring 11 on the corresponding side, so that the spring 11 is in a compressed state. At this time, the spring 11 has a large elastic potential energy, so that the movable balls 9 on both sides have a region that moves towards the middle, that is, they have a tendency to squeeze the cone block 13 outward into the arc groove 8.

[0036] When positioning mechanism 1 is assembled as shown in the attached figure Figure 1 When the position shown is reached, it can be used for the vertical installation of steel pipe columns. The steel pipe column is vertically inserted into the pre-drilled through hole in the center of the positioning mechanism 1 after assembly. If a gust of wind is encountered, causing the column to tilt, the steel pipe column will press against the movable platform 5 on the side facing the wind, causing the movable platform 5 to slide outward and causing the spring 11 to undergo elastic deformation. When the wind passes, the movable platform 5 will return to its initial state under the elastic potential energy of the spring 11. At this time, the movable platform 5 can be used to correct the steel pipe column, ensuring that it is lowered vertically and installed.

[0037] It is worth noting that when the steel pipe column is lifted by a crane, it can maintain a vertical position under gravity alone. Therefore, in the absence of wind, it is only necessary to insert the lower end of the steel pipe column vertically into the center of the disc formed by the circumferential assembly of the positioning mechanism 1. Even if gusts of wind affect the verticality of the steel pipe column, the verticality can be corrected by the self-positioning design of the positioning mechanism 1 to ensure that the steel pipe column is lowered vertically.

[0038] In this embodiment 2, refer toFigures 4-6 The application relates to a positioning device for a subway station cover-excavation reverse-construction steel pipe concrete middle column, and the bottom of each positioning mechanism 1 is provided with an adjusting mechanism 14, the adjusting mechanism 14 is a rectangular frame 15, a liftable nut pair 18 is arranged in the frame 15 through screw transmission, specifically, vertical lead screws 16 and guide columns 17 are arranged between upper and lower horizontal plates of the frame 15, the nut pair 18 is screw-connected with the lead screws 16, and sliding holes for the guide columns 17 to pass through are formed in the nut pair 18. A servo motor for driving the lead screws 16 to rotate is arranged in the inside of each positioning mechanism 1, and the nut pair 18 is lifted through electric driving. Fixed supports 19 are arranged on the side surfaces of the nut pair 18, two same connecting rods 20 are rotatably arranged on the fixed supports 19 through rotating shafts, and the lower ends of the connecting rods 20 are hingedly connected to the top of a steel sheath B23. As shown in the accompanying drawings, the top edge of the steel sheath B23 is provided with a flange 21, and the lower ends of the connecting rods 20 are rotatably arranged on the flange 21. The circumferentially-distributed steel sheaths B23 are spliced into a complete steel casing, and the two sides of the steel sheath B23 are respectively provided with connecting plates 22, and the adjacent steel sheaths B23 are stably connected through the connecting plates 22. Figure 6 In actual application, in the process of lowering the steel pipe column, a gale with a long duration may occur, in this state, if the verticality of the steel pipe column is maintained only through self-correction of the positioning mechanism 1, the lowering needs to be implemented after the gale ends, which needs to wait for a long time, does not help the improvement of work efficiency, and in actual operation, the work personnel cannot sensitively perceive the wind speed change, so the steel pipe column is inevitably inclined in the process of continuous lowering, and at this moment, the adjusting mechanism 14 needs to be used to implement forced correction on the steel pipe column.

[0039] Here, in order for the work personnel on the site to find the vertical deviation of the steel pipe column in the process of lowering, a design capable of directly indicating the deviation of the steel pipe column needs to be additionally arranged.

[0040] A pressure sensor should be arranged in the inner arc surface of each movable table 5, and a display device, such as a light-emitting diode, which is convenient to directly view, should be arranged at the bottom of each fixed table 4, the pressure signal of the pressure sensor can be directly converted into an electric signal of the corresponding light-emitting diode and control the switch of the light-emitting diode. When the steel pipe column is vertically deviated, the column body of the steel pipe column is pressed to the movable table 5 on one side, so that the corresponding light-emitting diode is lighted up through the signal transmission of the pressure sensor, and the work personnel can know how the steel pipe column is inclined.

[0041]

[0042] ​After the steel pipe column is determined to be inclined to one side of the positioning mechanism 1, only the adjustment mechanism 14 at the bottom of the positioning mechanism 1 on the other side needs to be started, and the nut pair 18 is controlled to move downward through the screw transmission mode, and the steel sheath B23 is pushed to the middle through the connecting rod 20, so that the forced correction of the steel pipe column can be realized. Since all the steel sheaths B23 are fixedly connected together through the connecting plate 22, the steel pipe column is equivalent to being constrained between all the steel sheaths B23, and only one steel sheath B23 needs to be pushed to move, so that the position of the steel pipe column can be changed.

[0043] Under the premise that the gust continues to act, the adjustment mechanism 14 also continues to work, and the steel pipe column can be pushed back to the original position through the forced correction, and because the adjustment mechanism 14 is used to push and correct the lower half of the steel pipe column, the upper half of the steel pipe column will also be correspondingly offset, so that when the lower half of the steel pipe column gradually recovers from the inclined state to the vertical state, the upper half of the steel pipe column will also gradually move away from the state of pressing against the movable table 5, so that when the pressure acting on the pressure sensor is removed, the indicator light at the bottom of the fixed table 4 will also be turned off. That is, the worker can clearly know whether the position of the steel pipe column at this moment is in the vertical state according to the on-off of the indicator light. The advantage of this design is that even if the environment is in the gust state, the steel pipe column can also be quickly lowered to the corresponding installation position in the vertical state.

[0044] Under the normal state, the spring 11 inside the positioning mechanism 1 is in the original length state, and the nut pair 18 on the adjustment mechanism 14 at the bottom of the positioning mechanism 1 is also at the same height, at this time, the center of the disc formed by the circumferential combination of the positioning mechanism 1 and the center of the steel casing formed by the circumferential combination of the steel sheath B23 are kept on the same vertical axis, and under the action of no external force, the steel pipe column is vertically inserted into the positioning mechanism 1, and it is natural to ensure the perpendicularity of the steel pipe column as it is slowly lowered.

[0045] Generally speaking, when the upper half of the column body of the steel pipe column is inclined to the left side, the lower half thereof should be inclined to the right side, and at this time, the positioning mechanism 1 and the adjustment mechanism 14 need to be used together. When the upper half of the column body of the steel pipe column presses against the left positioning mechanism 1, the lower half of the column body of the steel pipe column has the potential energy of being inclined to the right side at the same time, and the column body of the steel pipe column is in an inclined state, the height of the nut pair 18 in the adjustment mechanism 14 at the bottom of the right positioning mechanism 1 is lowered, and the lower half of the column body of the steel pipe column can be pushed to the left through the pushing of the connecting rod 20, and at the same time, the upper half of the column body of the steel pipe column originally pressing against the left positioning mechanism 1 will also move to the right with the elastic deformation of the spring 11, and the positioning mechanism 1 on the left upper side works together with the adjustment mechanism 14 on the right lower side, so that the steel pipe column can be finally ensured to be maintained in the vertical state, the installation is ensured to be smooth, and the working efficiency of the installation of the steel pipe column is improved.

[0046] It should be particularly pointed out that the positioning mechanism 1 or the adjusting mechanism 14 in the present embodiment 1 and the embodiment 2 are provided in four groups, and in fact, the number of the positioning mechanism 1 or the adjusting mechanism 14 can be any even multiple of two or three, as long as the positioning mechanism 1 forms a stable splicing state. The purpose of such design is to improve the accuracy of the calibrated orientation, because the inclination direction of the steel pipe column is indefinite, and therefore, the more positioning mechanisms 1 are designed, the more directions can be applied for correction. The positioning mechanism 1 and the adjusting mechanism 14 in the present embodiment 1 or the embodiment 2 are designed in four groups, which can only correct the four directions of east, south, west and north, and can also be eight groups, which can additionally control the four directions of east, south, north and west, or other cases.

[0047] In addition, the positioning mechanism 1 is provided with a downwardly inclined supporting leg 2 on the outer arc surface wall of the fixing table 4, and the lower end of the supporting leg 2 is provided with a mounting bottom plate 3. The supporting leg 2 and the mounting bottom plate 3 serve to fix the positioning mechanism 1 and ensure that the positioning mechanism 1 forms a stable support, thereby providing reliable support for the subsequent installation of the steel pipe column.

[0048] Since the positioning mechanism 1 and the steel sheath B23 are spliced together, after the installation of the steel pipe column is completed, only the respective positioning mechanisms 1 or steel sheaths B23 need to be disassembled, so that the device can be quickly removed, and then the respective positioning mechanisms 1 or steel sheaths B23 can be quickly reassembled for the fixation of the steel pipe column at the next location.

[0049] A positioning method for a cover-excavation reverse construction steel pipe concrete column in a subway station, the operation steps are as follows:

[0050] S1, harden the site and determine the pile position;

[0051] S2, punch a pile hole, insert the steel sheath A6 in the embodiment 1 spliced in a ring shape to form a steel casing, or insert the steel sheath B23 in the embodiment 2 fixed and assembled to form a steel casing, and reserve a spacing between the steel casing and the hole wall of the pile hole for verticality correction;

[0052] S3, place a steel reinforcement cage at the bottom of the pile hole, and pour concrete to obtain a foundation pile in the pile hole, wherein part of the steel reinforcement cage extends from the bottom of the foundation pile;

[0053] S4, insert the lower end of the steel pipe column into the center of the ring-shaped combined positioning mechanism 1, and use the cooperation of the positioning mechanism 1 and the adjusting mechanism 14 to correct the verticality of the steel pipe column during the lowering process in real time;

[0054] S5, the bottom of the steel pipe column is poured together with the foundation pile by pouring concrete, and after pouring to a specified height, the top plate is connected to the steel reinforcement cage, and the broken stone is backfilled outside the steel pipe column;

[0055] S6, the steel casing is pulled up, and then the installation base plate 3 and the positioning mechanism 1 are removed, the soil layer between the road and the station roof elevation is excavated, the subway station roof is constructed, the roof is connected with the top of the steel pipe column and the steel reinforcement cage, and then the concrete is poured completely;

[0056] S7, covering and backfilling, and recovering the road construction.

[0057] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A positioning device for a subway station cover-digging top-down steel pipe concrete column, characterized in that, The utility model provides a positioning mechanism (1), the positioning mechanism (1) is provided with several groups, positioning mechanism (1) is circumferentially combined and forms disc type design, the center of the disc is reserved vertical through -hole for steel pipe column insertion, positioning mechanism (1) is composed of fixed platform (4) and movable platform (5), movable platform (5) is installed on fixed platform (4) along the center radial sliding of the disc, the inner side arc surface wall of fixed platform (4) is elastically connected with several same movable ball (9) sliding, the outer side arc surface wall of movable platform (5) is provided with taper block (13), taper block (13) is inserted between the clearance of adjacent two movable ball (9) and forms elastic contact, the bottom of fixed platform (4) is provided with steel sheath A (6), and the circumferential distribution steel sheath A (6) is spliced into complete steel casing; The surface of the fixed platform (4) is provided with a radial guide groove (7), and the bottom of the movable platform (5) is provided with a guide strip (12) slidingly matched with the guide groove (7); The inner side of the fixed platform (4) is provided with an arc-shaped groove (8) along the arc surface wall, the inner slot of the arc-shaped groove (8) is designed in a circular shape, the outer slot is designed in a rectangular shape, a plurality of movable balls (9) are arranged in the inner slot of the arc-shaped groove (8), and the outer sides of the movable balls (9) located at the two side edges are respectively provided with sliding blocks (10) sliding along the groove of the arc-shaped groove (8), and the movable balls (9) are pressed against the end faces of the sliding blocks (10). The side of the sliding block (10) facing the end wall of the arc-shaped groove (8) is provided with a spring (11), and the movable ball (9) is in elastic contact with the spring (11) through the sliding block (10).

2. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 1, characterized in that, The outer side arc surface wall of the fixed platform (4) of the positioning mechanism (1) is provided with an inclined downward supporting leg (2), and the lower end of the supporting leg (2) is provided with a mounting bottom plate (3).

3. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 1, characterized in that, The bottom of the positioning mechanism (1) is respectively provided with an adjusting mechanism (14), the adjusting mechanism (14) is designed as a rectangular frame (15), a liftable nut pair (18) is installed in the frame (15) through a screw transmission mode, two parallel connecting rods (20) are arranged on the side of the nut pair (18), and the lower ends of the connecting rods (20) are hingedly connected to the top of the same steel sheath B (23).

4. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 3, characterized in that, A vertical lead screw (16) and a guide column (17) are arranged between the upper and lower horizontal plates of the frame (15), the nut pair (18) is threadedly matched with the lead screw (16), and a sliding hole is formed in the nut pair (18) for the guide column (17) to pass through.

5. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 3, characterized in that, The side of the nut pair (18) is provided with a fixed support (19), and the fixed support (19) is rotatably installed with two same connecting rods (20) through a rotating shaft.

6. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 5, characterized in that, The top edge of the steel sheath B (23) is provided with a flange (21), and the lower ends of the connecting rods (20) are rotatably installed on the flange (21).

7. The positioning device for the subway station cover-digging top-down construction steel pipe concrete column according to claim 3, characterized in that, The circumferentially distributed steel sheaths B (23) are spliced into a complete steel casing, and the two sides of the steel sheaths B (23) are respectively provided with connecting plates (22), and the adjacent steel sheaths B (23) are stably connected through the connecting plates (22).

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