Small trolley device for accurately positioning reinforcement cage in underground diaphragm wall groove of deep foundation pit support structure of subway station

Abstract

The invention relates to a small trolley device for accurately positioning a reinforcement cage in an underground diaphragm wall groove of a deep foundation pit support structure of a subway station, and belongs to the technical field of building construction equipment. The device mainly comprises a top plate, a cam drive plate, a driven disc, a hydraulic lifting mechanism, walking steel wheels and the like. The method is suitable for segmental hoisting of the super-long reinforcement cage, and preliminary approaching and butt joint of the upper segment and the lower segment of the same reinforcement cage are achieved through the lifting mechanism of the small trolley; precise butt joint of steel bar heads at the lower ends and the upper ends of the upper-section steel bar cage and the lower-section steel bar cage is achieved through small-amplitude rotation of the cam drive plate and the driven disc. The motor drives the driving gear to drive the chain, the chain drives the driven gear and the straight thread sleeve to rotate, and upper and lower section end steel bars of the reinforcement cage are screwed. The steel reinforcement cage moves in the groove through the walking steel wheels, and the steel reinforcement cage is accurately in butt joint with the adjacent steel reinforcement cage. Through small-amplitude rotation of the cam drive plate and the driven disc, small-amplitude rotation of the reinforcement cage in a narrow groove is achieved, the reinforcement cage is equally spaced from the front wall and the rear wall of a reinforcement cage groove hole, and it is guaranteed that the reinforcement cage is centered in the groove.

Description

Technical Field

[0001] This invention relates to a small trolley device for precisely positioning the steel cage in the diaphragm wall trench of a deep foundation pit retaining structure for subway stations, belonging to the technical field of construction equipment. Background Technology

[0002] Diaphragm walls are retaining structures used in the excavation of deep foundation pits for subway stations. They play a crucial role in protecting machinery and personnel during the excavation process and are an essential retaining measure for foundation pit excavation in saturated soft soil areas. The construction of diaphragm walls first requires trenching, typically 80-100cm wide and 30-60m deep. Before pouring concrete after trench excavation, a 30-60m long steel cage is lowered. The steel cage is then hoisted under ultra-low-altitude high-voltage lines. It needs to be segmented and connected at the trench opening. During connection, the steel cage inside the trench is suspended to align with the upper section hoisted by the crane. After connection and assembly, the steel cage needs further lowering, centering, and slight longitudinal movement along the trench.

[0003] The traditional segmented hoisting construction method for diaphragm wall reinforcement cages has the following drawbacks:

[0004] (1) The crane takes too long to move and is inefficient: When the steel cage is moved along the trench, the large crane needs to be restarted, which causes the process to be interrupted. Each move takes 2-3 hours, which affects the turnover efficiency of the large crane.

[0005] (2) Difficulty in centering the reinforcing cage in the trench: When the reinforcing cage in the trench is not equidistant from the two trench walls, it cannot be adjusted in time, which may cause the reinforcing cage to collide with the trench wall or the concrete cover to be insufficient.

[0006] (3) Difficulty in connecting the upper and lower sections of the steel cage: When the top steel bars of the steel cage in the trench are not on the same plane, it is impossible to guarantee the connection length and splicing quality of the steel bars of the upper section of the steel cage, which also affects the connection construction.

[0007] Therefore, it is necessary to find a device that can solve the above problems and achieve precise positioning, accurate connection and leveling of the upper and lower steel cage sections. Summary of the Invention

[0008] This invention provides an integrated automatic control trolley for precise docking, automatic leveling, and movement and rotation of steel reinforcement cages in the diaphragm wall trench of a subway station deep foundation pit. It solves the defects of traditional hoisting and docking methods, such as heavy reliance on cranes, poor docking accuracy, and the inability of the steel reinforcement cage to rotate in the diaphragm wall trench. It achieves precise positioning, accurate docking, and leveling of the upper and lower steel reinforcement cages.

[0009] Specifically, the present invention provides a small trolley device for precise positioning of the reinforcing cage in the diaphragm wall trench of a deep foundation pit retaining structure in a subway station, comprising:

[0010] The traveling mechanism includes a wheel assembly and a lifting mechanism connected above the wheel assembly;

[0011] The support mechanism includes a disc-shaped support platform supported by a lifting mechanism, the center of which is connected to a rotating column via a bearing assembly, and the rotating column supports a dial assembly;

[0012] The rebar butt tightening mechanism includes a top plate disposed above the dial assembly and a tightening transmission mechanism disposed on the top plate. The tightening transmission mechanism drives the connection between the threaded rebar at the end of the upper section of the rebar cage and the threaded rebar at the end of the lower section of the rebar cage through a transmission assembly and can control the tightening of the connection between the threaded rebar at the end of the upper section of the rebar cage and the threaded rebar at the end of the lower section of the rebar cage.

[0013] The "U"-shaped support beam, which passes through the upper or lower section of the reinforcing cage, is placed in the limiting groove of the top plate. Through the coordinated use of the traveling mechanism, the supporting mechanism, and the rebar connection and tightening mechanism, the upper and lower sections of the reinforcing cage are precisely positioned, accurately connected, and leveled.

[0014] Furthermore, the wheel assembly includes two traveling steel wheels connected by a connecting plate, and the two traveling steel wheels are connected to the hydraulic lifting mechanism support platform above by vertical plates on both sides and triangular braces.

[0015] Furthermore, the lifting mechanism includes a steel sleeve disposed within a fixed ring of the hydraulic lifting mechanism support platform. A lifting column and a hydraulic mechanism disposed within the lifting column are nested inside the steel sleeve. The hydraulic mechanism controls the lifting column to move up and down within the steel sleeve. The lifting column is connected to a disc-shaped support platform.

[0016] Furthermore, the disc-shaped support platform is provided with an annular groove containing a built-in grooved steel ball, and a central hole groove located at the center of the disc-shaped support platform, wherein a bearing assembly is fitted inside the central hole groove.

[0017] Furthermore, the bearing assembly includes an outer steel ring that fits into the central hole groove, the outer ring of the outer steel ring being provided with a convex key block that fits into the positioning groove on the central hole groove, an inner steel ring being provided inside the outer steel ring, bearing steel balls being provided between the outer steel ring and the inner steel ring, and a rotating column being fitted to the inner steel ring.

[0018] Furthermore, the dial assembly includes a dial motor disposed at the bottom of the top plate and a driven disk disposed on the rotating column. The output end of the dial motor is connected to a cam dial. Small cylinders are arranged in a ring on the driven disk. The cam dial can be movably fitted into the gap between any two adjacent small cylinders. The driven disk is supported and connected to the top plate through the top plate.

[0019] Further, at least one limiting groove is provided on the upper surface of the top plate, and any end of the carrying bar can be fitted into the limiting groove.

[0020] Further, at least two driving gear shafts are provided above the top plate. The connection parts of the driving gear shafts, the threaded steel bars at the end of the upper-section steel reinforcement cage, and the threaded steel bars at the end of the lower-section steel reinforcement cage are all wound with the same transmission chain and form a transmission connection.

[0021] Further, a straight thread sleeve is provided at the connection part of the threaded steel bars at the end of the upper-section steel reinforcement cage and the threaded steel bars at the end of the lower-section steel reinforcement cage. A gear on the outer ring of the sleeve is fixed on the straight thread sleeve. The bottom of the gear on the outer ring of the sleeve is connected to the straight thread sleeve through a positioning fixing rod, and the transmission chain is wound around the gear on the outer ring of the sleeve.

[0022] Further, the small trolley device makes all the steel bar heads at the upper end of the steel reinforcement cage on a horizontal plane through the lifting mechanism; through the dial wheel assembly, it drives a small rotation of the overall structure of the upper part of the steel reinforcement cage, realizes a small rotation of the steel reinforcement cage, and ensures the parallel state and centering of the steel reinforcement cage and the two groove walls of the diaphragm wall, realizes the precise butt joint of the end steel bars of the upper and lower sections of the steel reinforcement cage; realizes the movement of the steel reinforcement cage along the groove in the diaphragm wall groove through the traveling mechanism and precisely butt-joints with the adjacent steel reinforcement cages; realizes the screwing and fixing of the end steel bars of the upper and lower sections of the steel reinforcement cage through the steel bar butt-joint tightening mechanism.

[0023] The beneficial effects of the present invention:

[0024] The small trolley device for accurately positioning, precisely butt-jointing and leveling the steel reinforcement cage in the diaphragm wall groove of the deep foundation pit retaining structure of the subway station of the present invention realizes the leveling of the steel reinforcement cage by the small trolley, drives the movement and rotation of the steel reinforcement cage in the groove, greatly improves the construction efficiency of the placement of the steel reinforcement cage in the diaphragm wall groove, the butt joint of the upper and lower sections of the steel reinforcement cage and the centering of the steel reinforcement cage in the groove, reduces the lifting machinery work shifts and labor, speeds up the diaphragm wall construction speed, and ensures the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the "return" - shaped long carrying bar of the steel reinforcement cage in an embodiment of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the steel bar butt-joint tightening mechanism in an embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of the overall structure of the small trolley device in an embodiment of the present invention.

[0028] Figure 4 It is a schematic diagram of the connection between the dial wheel assembly and the top plate in an embodiment of the present invention.

[0029] Figure 5This is a schematic diagram of the dial assembly in one embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of a disc-shaped support platform in one embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the bearing assembly in one embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of the bottom structure of a disc-shaped support platform in one embodiment of the present invention.

[0033] Figure 9 This is a schematic diagram of the lifting mechanism in one embodiment of the present invention.

[0034] Figure 10 This is a schematic diagram of the wheel assembly mechanism in one embodiment of the present invention.

[0035] In the diagram: 1. Rebar cage; 2. Lifting beam; 3. Straight threaded sleeve; 4. Gear on the outer ring of the sleeve; 5. Positioning and fixing rod; 6. Drive gear shaft; 7. Threaded steel bar at the end of the upper section of the rebar cage; 8. Threaded steel bar at the end of the lower section of the rebar cage; 9. Drive chain; 10. Top plate; 11. Limiting groove; 12. Top plate support; 13. Driven disc; 14. Small cylinder; 15. Rotating column; 16. Cam dial; 17. Dial motor; 18. Grooved steel ball; 19. Annular groove. 20. Disc-shaped support platform; 21. Convex key block; 22. Outer steel ring; 23. Inner steel ring; 24. Bearing steel ball; 25. Fixing ring at the bottom of the disc support platform; 26. Lifting column; 27. Steel sleeve; 28. Installation hook; 29. ​​Oil outlet; 30. Oil inlet; 31. Fixing ring of the hydraulic lifting mechanism support platform; 32. Hydraulic lifting mechanism support platform; 33. Triangular brace; 34. Vertical plates on both sides; 35. Connecting plate; 36. Traveling steel wheel. Detailed Implementation

[0036] 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, not all, of the embodiments of the present invention. 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.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In this invention, the terms "first" and "second" are used only to distinguish similar components / parts in different positions or with different characteristics, and have no other limiting meaning; "upper" refers to the direction in which each component is away from the ground, and "lower" refers to the direction in which each component is away from the ground.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] This invention provides a small trolley device for precise positioning of the reinforcing cage in the diaphragm wall trench of a deep foundation pit retaining structure in a subway station. The small trolley device includes, from bottom to top, a traveling mechanism, a supporting mechanism, and a reinforcing steel bar connection and tightening mechanism. Wherein:

[0041] The traveling mechanism includes a wheel assembly and a lifting mechanism connected above the wheel assembly. Figure 10 In the example, the wheel assembly includes two walking steel wheels 36, which are connected at their axles by a connecting plate 35. The axles of the two walking steel wheels 36 are also connected to the upper hydraulic lifting mechanism support platform 32 by two vertical plates 34 on both sides and a triangular brace 33, in order to maintain the stability of the hydraulic lifting mechanism support platform 32.

[0042] exist Figure 9 In the example, the lifting mechanism includes a steel sleeve 27 disposed within a fixed ring 31 of a hydraulic lifting mechanism support platform. A lifting column 26 and a hydraulic mechanism disposed within the steel sleeve 27 are nested inside the steel sleeve 27. An oil outlet 29 and an oil inlet 20 communicating with the hydraulic mechanism are also disposed on the surface of the steel sleeve 27. The lifting column 26 is controlled to move up and down within the steel sleeve 27 by the hydraulic mechanism. The lifting column 26 is connected to a disc-shaped support platform 20.

[0043] exist Figure 8 In the example, the bottom of the disc-shaped support platform 20 is also provided with a fixing ring 25 at the bottom of the disc support platform, and the top of the lifting column 26 is fitted into the fixing ring 25 at the bottom of the disc support platform to stabilize the connection between the lifting column 26 and the disc-shaped support platform 20 and prevent the lifting column 26 from detaching.

[0044] exist Figures 6-8 In one example, the support mechanism includes a disc-shaped support platform 20 supported by a lifting mechanism. The center of the disc-shaped support platform 20 is connected to a rotating column 15 via a bearing assembly. The rotating column 15 supports a dial assembly. In some embodiments, the disc-shaped support platform 20 is provided with an annular groove 19 having two rings of built-in grooved steel balls 18, and a central hole groove provided at the center of the disc-shaped support platform 20, wherein a bearing assembly is fitted inside the central hole groove.

[0045] Furthermore, the bearing assembly includes an outer steel ring 22 that fits into the central hole groove. The outer ring of the outer steel ring 22 is provided with a convex key block 21 that fits into the positioning groove on the central hole groove. An inner steel ring 23 is provided inside the outer steel ring 22. A bearing steel ball 24 is provided between the outer steel ring 22 and the inner steel ring 23. The inner steel ring 23 is fitted with a rotating column 15.

[0046] exist Figure 5 In the example, the dial assembly includes a dial motor 17 disposed at the bottom of the top plate and a driven disk 13 disposed on the rotating column 15. The output end of the dial motor 17 is connected to a cam dial 16. Small cylinders 14 are arranged in a ring on the driven disk 13. The cam dial 16 can be movably engaged in the gap between any two adjacent small cylinders 14. The driven disk 13 is connected to the top plate 10 through the top plate support 12. When the cam dial 16 is exactly in the gap between two adjacent small cylinders 14, the dial motor 17 drives the cam dial 16 to rotate. The cam dial 16 will then push the small cylinders 14, causing the driven disk 13 to rotate. Subsequently, the cam dial 16 will leave the driven disk 13 to continue its circular motion, and will re-enter the gap between two adjacent small cylinders 14 when it rotates to the vicinity of the driven disk 13 again. The advantages of setting the cam dial to drive the driven disk 13 to rotate are as follows: Each time the cam dial 16 is turned, it only drives the driven disk 13 to rotate by a small amplitude, which is suitable for millimeter-level fine adjustment and docking of the threaded steel bars at the end of the upper section of the steel cage and the threaded steel bars at the end of the lower section of the steel cage; In addition, the rotation angle of the steel cage in the groove is 6° to 10°. Each time the cam dial 16 is turned, it will cause the driven disk, the support beam, and the steel cage on the support beam to rotate by only a small angle, avoiding the large-angle rotation of the steel cage caused by continuous rotation.

[0047] exist Figure 4In the example, the rotating column 15 penetrates through the disc-shaped top plate support 12. At the same time, the rotating column 15, the top plate support 12, and the driven disc 13 are formed into an integrally rotating unit, which can rotate on the disc-shaped support platform 20 through a bearing assembly, while the disc-shaped support platform 20 remains stationary.

[0048] The steel bar butt joint tightening mechanism includes a top plate 10 arranged above the dialing wheel assembly and a tightening transmission mechanism arranged on the top plate 10. The tightening transmission mechanism drives and connects the joint of the threaded steel bar 7 at the end of the upper section of the steel reinforcement cage and the threaded steel bar 8 at the end of the lower section of the steel reinforcement cage through a transmission assembly and can control the tightening of the joint of the threaded steel bar 7 at the end of the upper section of the steel reinforcement cage and the threaded steel bar 8 at the end of the lower section of the steel reinforcement cage; at least one limiting groove 11 is arranged on the upper surface of the top plate 10. Any end of the carrying bar 2 can be fitted into the limiting groove 11, and the other end can be placed on a small trolley device with the same structure on the other side of the diaphragm wall groove. The two small trolley devices have the same functions.

[0049] In Figures 2-3 In the example, at least two driving gear shafts 6 are arranged above the top plate 10. The driving gear shafts 6, the joint of the threaded steel bar at the end of the upper section of the steel reinforcement cage, and the joint of the threaded steel bar at the end of the lower section of the steel reinforcement cage are all wound with the same transmission chain 9 and form a transmission connection.

[0050] Place the "return" - shaped carrying bar 2 passing through the upper section of the steel reinforcement cage or the lower section of the steel reinforcement cage into the limiting groove 11 of the top plate 10. Through the coordinated use of the traveling mechanism, the supporting mechanism, and the steel bar butt joint tightening mechanism, the accurate positioning, precise butt joint, and leveling of the upper section of the steel reinforcement cage and the lower section of the steel reinforcement cage are realized.

[0051] Further, a straight thread sleeve 3 is arranged at the joint of the threaded steel bar at the end of the upper section of the steel reinforcement cage and the threaded steel bar at the end of the lower section of the steel reinforcement cage. A gear on the outer ring of the sleeve 4 is fixed on the straight thread sleeve 3. The bottom of the gear on the outer ring of the sleeve 4 is connected to the straight thread sleeve 3 through a positioning fixing rod 5. The transmission chain 9 is wound around the gear on the outer ring of the sleeve 4.

[0052] Further, the small trolley device makes all the steel bar heads at the upper end of the steel reinforcement cage on one horizontal plane through the lifting mechanism; through the dialing wheel assembly, it drives a small - amplitude rotation of the overall structure of the upper part of the steel reinforcement cage, realizes the small - amplitude rotation of the steel reinforcement cage, and ensures the parallel state and centering of the steel reinforcement cage and the two groove walls of the diaphragm wall, realizing the precise butt joint of the end - head steel bars of the upper and lower sections of the steel reinforcement cage; through the traveling mechanism, it realizes the movement of the steel reinforcement cage in the diaphragm wall groove along the groove and accurately butt - joints with the adjacent steel reinforcement cages; through the steel bar butt joint tightening mechanism, it realizes the screwing and fixing of the end - head steel bars of the upper and lower sections of the steel reinforcement cage.

[0053] Embodiment 1

[0054] The present invention provides a trolley device for accurately positioning the steel reinforcement cage in the groove of the diaphragm wall of the deep foundation pit of a subway station. According to the length of the steel reinforcement cage of the diaphragm wall and the groove depth, it can be applied to the hoisting construction of a single-section or multi-section steel reinforcement cage (the number of sections n≥1). In this embodiment, taking the butt joint of two sections of steel reinforcement cages (n = 2) as an example, the implementation process of the trolley device is described in detail.

[0055] As Figure 2 shown, the driving gear shaft 6 is driven by a motor to drive the transmission chain 9 to rotate. While the transmission chain 9 is transmitting, it drives the gear 4 on the outer ring of the sleeve to rotate. The gear 4 on the outer ring of the sleeve is composed of two symmetrical half gears. Each half gear is connected to the straight thread sleeve 3 by a gear positioning fixing rod 5. The gear 4 on the outer ring of the sleeve and the straight thread sleeve 3 rotate synchronously, realizing the precise butt joint and tightening fixation of the threaded steel bars 7 and 8 at the ends of the upper and lower sections of the steel reinforcement cage.

[0056] As Figure 5 shown, the dial motor 17 drives the cam dial 16. Every time the cam dial 16 rotates one circle, it generates a thrust on the small cylinder 14 on the driven disk 13, thereby driving the driven disk 13 and its upper overall structure to rotate slightly.

[0057] As Figure 6 and Figure 7 shown, Figure 7 the convex key block 21 of the outer ring steel ring 22 of Figure 6 is inserted into the middle hole groove 19 of the disc-shaped support platform 20 of Figure 7 The disc-shaped support platform 20 is provided with two circles of grooves, and the steel balls 18 in the grooves can rotate freely, ensuring that the driven disk 13 on the disc-shaped support platform 20 can rotate freely.

[0058] Next, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

[0059] The first step:

[0060] As Figure 1 shown, positioning the first section of the steel reinforcement cage: Pass the "square frame" long bar-shaped carrying bar 2 through the steel reinforcement cage 1. One end of the carrying bar is placed in the limiting groove 11 of the top plate 10, and the other end of the carrying bar 2 is placed on the trolley device on the other side of the diaphragm wall groove. The two trolley devices have the same function.

[0061] As Figure 9As shown, the lifting mechanism is started, and oil is injected into the oil inlet 30. Under the action of oil pressure, the lifting column 26 rises to the predetermined height, the lifting disc-shaped support platform 20 rises, and the lifting driven disc 13 and its upper structure rise synchronously. The height difference between the two edges of the top plate is measured by a laser leveling instrument, and the oil pressure is adjusted to keep the top plate 10 horizontal. The support beam 12 on the top plate 10 suspends the steel cage 1 until all the steel bar ends at the upper end of the steel cage 1 are on the same horizontal plane, and the upper end of the steel bar of the lower section of the steel cage is basically aligned with the lower end of the steel bar of the upper section of the steel cage.

[0062] Step Two:

[0063] like Figure 4 As shown, the dial motor 17 drives the cam dial 16. Each rotation of the cam dial 16 generates a thrust on the small cylinder 14 on the driven disc 13, thereby causing the driven disc 13 and its upper structure to rotate slightly. The slight rotation of the top plate 10 causes the "U"-shaped support bar 2 and the steel cage 1 suspended on the support bar 2 to rotate slightly, ensuring that the steel cage 1 is equidistant from the two sides of the groove.

[0064] Step 3:

[0065] Precise rebar cage connection: The second rebar cage is hoisted to the top of the trench and directly above the first rebar cage suspended by the support beam, and slowly lowered. Simultaneously, the traveling wheels 36 move along the trench, the lifting column 26 in the lifting mechanism can move up and down, and the cam dial 16 drives the driven plate 13 to rotate. These three adjustments ensure precise connection between the lower end rebar of the upper rebar cage and the upper end rebar of the lower rebar cage. Furthermore, all the lower rebars of the upper rebar cage are connected to all the upper rebars of the lower rebar cage.

[0066] like Figure 2 As shown, the drive motor of the active gear shaft 6 is started, and the gear shaft and gear rotate synchronously, driving the transmission chain 9 to rotate, and at the same time driving the gear 4 on the outer ring of the sleeve to rotate. The synchronous rotation of the straight thread sleeve 3 and the gear 4 on the outer ring of the sleeve tightens and fixes the upper and lower sections of steel bars.

[0067] Step 4:

[0068] After all the rebar joints are tightened by rotating the straight threaded sleeve 3, the two rebar cage sections 1 are slightly lifted by the crane, the rebar cage 1 and the support beams 2 are separated, and the two support beams 2 are pulled out. After the support beams 2 are pulled out, the crane is started to slowly lower the two rebar cage sections 1, which are now a whole, until the corresponding position at the upper end of the second rebar cage reaches the groove. Then, two U-shaped support beams 2 are inserted at the designed position at the upper end of the second rebar cage. The two ends of the support beams 2 are placed on two small trolley devices on both sides of the diaphragm wall. The crane is then turned around to lift the third rebar cage section.

[0069] Follow-up assignment:

[0070] The first to fourth steps are repeated until all sections of the rebar cage are hoisted into the trench. The small trolley device and channel steel replace the crane, reducing the need for one crane, improving construction efficiency and docking accuracy, and ensuring the precise positioning of the rebar cage.

[0071] The small trolley device is suitable for the construction of rebar cages with any number of sections (n≥1). Any equivalent implementation or structural modification based on the core principle of "walking mechanism + hydraulic leveling + micro-rotation adjustment + precise docking and tightening" (such as straight thread sleeves and gears, or an increase in the number of small adjustment dials) falls within the scope of protection of this invention patent.

[0072] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A small trolley device for precise positioning of steel cages in the diaphragm wall trench of a deep foundation pit retaining structure for a subway station, characterized in that, Comprising: A traveling mechanism, including a wheel set mechanism and a lifting mechanism connected above the wheel set mechanism; A supporting mechanism, including a disc-shaped supporting platform carried by the lifting mechanism, the center of the disc-shaped supporting platform is connected to a rotating column through a bearing assembly, and the rotating column carries a dialing wheel assembly; A steel bar butt-joint tightening mechanism, including a top plate arranged above the dialing wheel assembly and a tightening transmission mechanism arranged on the top plate, the tightening transmission mechanism drives and connects the joint of the threaded steel bars at the end of the upper-section steel bar cage and the threaded steel bars at the end of the lower-section steel bar cage through a transmission component and can control the tightening of the joint of the threaded steel bars at the end of the upper-section steel bar cage and the threaded steel bars at the end of the lower-section steel bar cage; Place the "return" - shaped carrying bar passing through the upper-section steel bar cage or the lower-section steel bar cage into the limiting groove of the top plate, and through the coordinated use of the traveling mechanism, the supporting mechanism, and the steel bar butt-joint tightening mechanism, the precise positioning, accurate docking, and leveling of the upper-section steel bar cage and the lower-section steel bar cage are achieved.

2. The trolley device according to claim 1, characterized in that, The wheel set mechanism includes two traveling steel wheels connected by a connecting plate, and the two traveling steel wheels are connected to the hydraulic lifting mechanism support platform above through vertical plates on both sides and triangular braces.

3. The trolley device according to claim 2, characterized in that, The lifting mechanism includes a steel sleeve arranged in a fixed ring of the hydraulic lifting mechanism support platform, a lifting column is nested in the steel sleeve, and a hydraulic mechanism is arranged on the lifting column. The lifting column is controlled by the hydraulic mechanism to move up and down in the steel sleeve, and the lifting column is connected to the disc-shaped supporting platform.

4. The trolley device according to claim 3, characterized in that, The disc-shaped supporting platform is provided with an annular groove with built-in groove steel balls, and a middle hole groove is arranged at the center of the disc-shaped supporting platform, and a bearing assembly is fitted in the middle hole groove.

5. The trolley device according to claim 4, characterized in that, The bearing assembly includes an outer ring steel ring fitted in the middle hole groove, convex key blocks are arranged on the outer ring of the outer ring steel ring to be fitted with the positioning grooves on the middle hole groove, an inner ring steel ring is arranged inside the outer ring steel ring, bearing steel balls are arranged between the outer ring steel ring and the inner ring steel ring, and the inner ring steel ring is fitted with a rotating column.

6. The trolley device according to claim 5, characterized in that, The dialing wheel assembly includes a dialing motor arranged at the bottom of the top plate and a driven disc arranged on the rotating column, the output end of the dialing motor is connected to a cam dial, small cylinders are arranged annularly on the driven disc, the cam dial can be movably fitted in the gap between any two adjacent small cylinders, and the driven disc is supported and connected to the top plate through the top plate.

7. The trolley device according to claim 6, characterized in that, At least one limiting groove is arranged on the upper surface of the top plate, and any end of the carrying bar can be fitted in the limiting groove.

8. The trolley device according to claim 7, characterized in that, At least two driving gear shafts are arranged above the top plate, and the driving gear shafts, the joint of the threaded steel bars at the end of the upper-section steel bar cage, and the joint of the threaded steel bars at the end of the lower-section steel bar cage are all wound with the same transmission chain and form a transmission connection.

9. The trolley device according to claim 8, characterized in that, A straight thread sleeve is arranged at the joint of the threaded steel bars at the end of the upper-section steel bar cage and the threaded steel bars at the end of the lower-section steel bar cage, a gear on the outer ring of the sleeve is fixed on the straight thread sleeve, the bottom of the gear on the outer ring of the sleeve is connected to the straight thread sleeve through a positioning fixing rod, and the transmission chain is wound on the gear on the outer ring of the sleeve.

10. The method of applying the trolley device according to any one of claims 1 to 9, characterized in that, The trolley device uses a lifting mechanism to ensure that all the steel bars at the top of the steel cage are on a horizontal plane; through the dial wheel assembly, it drives the upper structure of the steel cage to rotate slightly, achieving a small rotation of the steel cage and ensuring that the steel cage is parallel and centered with the two trench walls of the diaphragm wall, thus achieving precise connection of the steel bars at the ends of the upper and lower sections of the steel cage; through the walking mechanism, it enables the steel cage to move along the trench in the diaphragm wall and precisely connect with the adjacent steel cage; through the steel bar connection and tightening mechanism, it achieves the tightening of the steel bars at the ends of the upper and lower sections of the steel cage.

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