A prefabricated track slab manual three-way fine adjustment bracket

Abstract

This utility model discloses a prefabricated track slab manual three-way fine-tuning support, belonging to the field of rail transit construction technology. The support includes a symmetrically arranged support one and a support two. Support one is equipped with active adjustment devices in the Z, Y, and X directions, while support two is equipped with active adjustment devices in the Z and Y directions and a passive adjustment device in the X direction. The active X-direction adjustment device drives the longitudinal displacement of the track slab through a second reversing device, a second coupling, and a second lead screw. The passive X-direction adjustment device uses a guide frame with tapered wheels to achieve low-friction rolling support. The active Z-direction adjustment device adapts to the curvature of the tunnel segment through a hinged support shoe, avoiding contact stress concentration. The Y-direction adjustment device achieves precise lateral adjustment through a reversing transmission mechanism. This solution, through an active-passive coordinated adjustment mechanism, solves the problems of traditional tooling being unable to adapt to curved support surfaces, high manpower requirements for multi-directional adjustment, and large sliding resistance, significantly improving the three-dimensional positioning efficiency and construction safety of the track slab.

Description

Technical Field

[0001] This utility model relates to the field of rail transit construction technology, and in particular to a manual three-way fine adjustment bracket for prefabricated track slabs. Background Technology

[0002] In the field of rail transit, the fine-tuning of prefabricated track slabs directly affects track smoothness and train operation safety. In existing technologies, large-diameter rail slabs (such as CRTS I / II / III type slabs) generally employ three-way adjustment fixtures based on flat ground supports, using screw mechanisms to achieve elevation (Z-axis), lateral (Y-axis), and longitudinal (X-axis) adjustments. However, subway track slabs need to be installed on the curved surface of shield tunnel segments, where the support surface exhibits significant curvature differences. Traditional fixtures, due to their leg structures' inability to adapt to the segment curvature, suffer from stress concentration, reduced adjustment accuracy, and even segment damage. Furthermore, existing technologies rely on multiple sets of screws for longitudinal (X-axis, i.e., mileage direction) adjustment, requiring multiple workers to apply force simultaneously. This can easily lead to mechanism jamming and asynchronous adjustments, and the lack of a driven guide mechanism results in high sliding resistance and low adjustment efficiency. To address these shortcomings, there is an urgent need for a three-way fine-tuning support adapted to the shield tunnel environment, possessing active-driven coordinated adjustment capabilities, to improve construction efficiency and reduce the risk of structural damage. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a prefabricated track slab manual three-way fine adjustment bracket.

[0004] This utility model provides a manual three-way fine-tuning bracket for prefabricated track slabs: it includes a bracket 1 and a bracket 2 symmetrically arranged. The bracket 1 is equipped with a Z-axis active adjustment device, an X-axis active adjustment device, and a Y-axis active adjustment device. The bracket 2 is equipped with a Z-axis active adjustment device, a Y-axis active adjustment device, and an X-axis passive adjustment device. The X-axis active adjustment device includes a second commutator, a second coupling, a second transmission shaft, and a second lead screw. The second lead screw is fixedly installed through a bearing seat. The X-axis passive adjustment device includes a guide frame and a rotatable conical wheel.

[0005] Optionally: the guide frame of the X-direction passive adjustment device is fixedly connected to the bracket via a connecting plate, and the conical wheel is symmetrically arranged along the longitudinal axis of the guide frame.

[0006] Optionally, the Y-axis active adjustment device includes a first commutator, a first coupling, a first drive shaft, a first lead screw, a first lead screw nut, and a suspension plate.

[0007] Optionally: the first lead screw of the Y-axis active adjustment device is fixedly installed by the first lead screw seat, the two ends of the first lead screw are supported by cylindrical roller bearings and thrust ball bearings, and the end of the first lead screw is provided with the first coupling to connect to the first drive shaft.

[0008] Optionally: the first commutator is connected to the first drive shaft via the first coupling, and two sets of the first commutator and lead screw drive assemblies are symmetrically arranged at both ends of the first drive shaft.

[0009] Optionally: The Z-axis active adjustment device includes a third lead screw, a third lead screw base, and an adjustable support leg. The end of the adjustable support leg is hinged with a support shoe that matches the curvature of the shield tunnel segment. The third lead screw base is connected to a support bracket through a bolt hole.

[0010] Optionally, the rolling surface of the cone wheel is a conical structure that matches the sliding surface of the track plate, and the cone wheel is rotatably mounted on the bottom of the guide frame via a bearing.

[0011] Optionally: The X-axis active adjustment device of the bracket is provided with a detachable cover, and the Y-axis active adjustment device of the bracket is provided with a sheet metal cover.

[0012] The embodiments of this utility model have the following technical effects:

[0013] This technical solution significantly optimizes the efficiency of track slab fine-tuning through a three-way coordinated adjustment mechanism. The multi-stage transmission design of the commutator and coupling in the X-axis active adjustment device converts a single manual input into a bidirectional synchronous linear driving force. Combined with the conical wheel rolling guide structure of the X-axis passive adjustment device, the frictional resistance of the track slab during longitudinal (mileage direction) movement is greatly reduced, enabling single-person operation for precise large-stroke adjustments. The hinged support shoe of the Z-axis active adjustment device can adapt to the curvature of the shield tunnel segment surface, eliminating local stress concentration by increasing the contact area, preventing damage to the segment surface, and ensuring support stability during elevation adjustment. The Y-axis adjustment device, through the vertical transmission layout of the commutator and lead screw, shifts the lateral adjustment operation space from the sides of the track slab to the top, solving the problem of multi-station interference in confined tunnel spaces. Furthermore, the active-passive linkage X-axis adjustment mechanism automatically compensates for track slab displacement and deflection, avoiding the risks of mechanism jamming and track slab twisting associated with traditional multi-lead screw synchronous operations, thus improving overall construction efficiency. The sheet metal covering and modular design further enhance the equipment's dust and impact resistance, extending the service life of key transmission components. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1A schematic diagram illustrating an application scenario of a manual three-way fine-tuning bracket for a prefabricated track slab provided in this embodiment of the present utility model;

[0016] Figure 2 A schematic diagram of the overall mechanism of a manual three-way fine-tuning bracket for a prefabricated track slab provided in this embodiment of the utility model;

[0017] Figure 3 A schematic diagram of the sheet metal cover structure provided in this embodiment of the utility model;

[0018] Figure 4 A schematic diagram of a Y-axis active adjustment device provided in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the detachable cover structure provided in an embodiment of the present utility model;

[0020] Figure 6 A schematic diagram of the X-axis active adjustment device provided in an embodiment of this utility model;

[0021] Figure 7 A schematic diagram of a Z-axis active adjustment device provided in an embodiment of this utility model;

[0022] Figure 8 A schematic diagram of another Z-axis active adjustment device provided in this embodiment of the utility model;

[0023] Figure 9 A schematic diagram of another Z-axis active adjustment device provided in this embodiment of the utility model;

[0024] Figure 10 This is a schematic diagram of an X-axis passive adjustment device provided for an embodiment of the present utility model.

[0025] Figure Labels

[0026] 1. Support frame one; 2. Support frame two; 3. Tunnel segment; 4. Track slab;

[0027] 11. Z-axis active adjustment device; 111. Housing; 112. Adjustable support leg; 113. Support shoe; 114. Extension mechanism; 115. Pressure plate; 116. Slide plate; 117. Third lead screw nut; 118. Bolt hole; 119. Bearing; 1110. Third lead screw;

[0028] 13. X-axis active adjustment device; 131. Second commutator; 132. Removable cover; 133. Second coupling; 134. Second drive shaft; 136. Third commutator; 138. Second end cover; 139. Second lead screw nut; 1310. Second lead screw; 1311. Bearing housing;

[0029] 14. Y-axis active adjustment device; 142. Sheet metal cover; 143. First commutator; 144. First coupling; 145. First drive shaft; 147. First end cover; 148. Bushing; 149. Cylindrical roller bearing; 1410. Split cover; 1411. First lead screw; 1412. First lead screw nut; 1413. First lead screw nut seat; 1414. Through cover; 1416. Thrust ball bearing; 1417. Hanging plate;

[0030] 25. X-axis passive adjustment device; 251. Frame structure; 252. Guide frame; 253. Connecting plate; 254. Conical wheel. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] See Figure 1-10 This utility model provides a manual three-way fine-tuning bracket for a prefabricated track slab: it includes a bracket 1 and a bracket 2 symmetrically arranged. The bracket 1 is equipped with a Z-axis active adjustment device 11, an X-axis active adjustment device 13, and a Y-axis active adjustment device 14. The bracket 2 is equipped with a Z-axis active adjustment device 11, a Y-axis active adjustment device 14, and an X-axis passive adjustment device 25. The X-axis active adjustment device 13 includes a second commutator 131, a second coupling 133, a second drive shaft 134, and a second lead screw 1310, which is fixedly installed via a bearing seat 1311. Furthermore, the Y-axis active adjustment device 13 also includes a detachable cover 132, a third commutator 136, a second end cap 138, a second lead screw nut 139, and a bearing seat 1311. The X-axis passive adjustment device 25 includes a guide frame 252 and a rotatable conical wheel 254.

[0033] The prefabricated track slab manual three-way fine-tuning support consists of support 1 and support 2 symmetrically arranged at the front and rear ends of the track slab 4, which sits inside the tunnel segment 3. Support 1 is equipped with a Z-axis active adjustment device 11, an X-axis active adjustment device 13, and a Y-axis active adjustment device 14. Support 2 is equipped with the same Z-axis active adjustment device 11, Y-axis active adjustment device 14, and an X-axis passive adjustment device 25. The second commutator 131 of the X-axis active adjustment device 13 is connected to the second drive shaft 134 via a second coupling 133. The end of the second drive shaft 134 is connected to the third commutator 136 via a coupling 135. The output end of the third commutator 136 drives the second lead screw 1310 to rotate via a coupling 137. The second lead screw 1310 engages with a bearing seat 1311 fixed to support 1, and the second lead screw nut 139 drives the entire device to slide along the X-axis. The second commutator 131 forms a two-stage direction conversion. The bottom of the guide frame 252 of the X-axis passive adjustment device 25 is equipped with multiple sets of conical wheels 254 that can rotate around the axis. The contact surface between the conical wheels 254 and the guide frame 252 forms a rolling support. During construction, the construction personnel adjust the movement direction through the second reversing device 131, that is, along the positive X-axis or along the negative X-axis. Then, they adjust the movement direction of the track plate 4 through a wrench or related tools until it moves to the target position.

[0034] In some embodiments: the guide frame 252 of the X-direction passive adjustment device 25 is fixedly connected to the bracket 2 via the connecting plate 253, and the cone wheel 254 is symmetrically arranged along the longitudinal axis of the guide frame 252.

[0035] The guide frame 252 of the X-axis passive adjustment device 25 is welded to the top of the frame of the second bracket 2. One end of the connecting plate 253 is fixed to the guide frame 252, and the other end is connected to the housing of the Y-axis active adjustment device 14 by bolts. Conical wheels 254 are rotatably mounted on the mounting shaft at the bottom of the guide frame 252 via bearings. Multiple conical wheels 254 are arranged at equal intervals along the length of the guide frame 252, and the conical rolling surface of the conical wheels 254 contacts the guide groove reserved at the bottom of the track plate 4. When the track plate 4 moves in the X-axis, the conical wheels 254 rotate around their axis, converting the sliding friction between the track plate 4 and the guide frame 252 into rolling friction. Limiting baffles are provided on both sides of the guide frame 252 to prevent the conical wheels 254 from detaching from the guide surface of the track plate 4 during dynamic adjustment. An elongated hole is provided at the connection between the connecting plate 253 and the second bracket 2, allowing the guide frame 252 to be finely adjusted in the Y-axis to compensate for installation errors. The frame structure 251 can slide up and down under the action of the sliding plate 116 and the pressure plate 115.

[0036] In some embodiments: the first lead screw nut 1412 of the Y-direction active adjustment device 14 is fixedly installed by the first lead screw seat 1413, the two ends of the first lead screw 1411 are supported by cylindrical roller bearings 149 and thrust ball bearings 1416, and the end of the first lead screw 1411 is provided with another first coupling 144 to connect the first drive shaft 145.

[0037] The first lead screw nut 1412 of the Y-axis active adjustment device 14 is fixed to the frame of bracket 1 via the first lead screw seat 1413. The left end of the first lead screw 1411 is supported on the bracket housing via a cylindrical roller bearing 149, and the right end is axially and radially constrained via a thrust ball bearing 1416 and another cylindrical roller bearing 149. The first drive shaft 145 is connected to the end of the first lead screw 1411 via another first coupling 144 to ensure coaxiality of power transmission. A manual crank is provided at the input end of the first commutator 143. When the operator rotates the crank, the first commutator 143 converts the rotation direction to a direction perpendicular to the axis of the first drive shaft 145, and the power is transmitted to the first drive shaft 145 via the first coupling 144. This design decouples the bidirectional linear motion of the first lead screw 1411 from the manually input rotational motion, avoiding limited operating space. The first lead screw seat 1413 adopts a split structure and is sealed with a cover 1414 to prevent construction dust from entering the lead screw pair and affecting the transmission accuracy.

[0038] In some embodiments: the first commutator 143 is connected to the first drive shaft 145 via the first coupling 144, and two sets of first commutators 143 and lead screw drive assemblies are symmetrically arranged at both ends of the first drive shaft 145.

[0039] The first commutator 143 is symmetrically arranged on both sides of the first drive shaft 145. One side of the first commutator 143 is connected to the first drive shaft 145 via a first coupling 144, while the other side's commutator is installed in the opposite direction using the same structure. The output ends of the two first commutators 143 are respectively connected to independent first lead screws 1411, forming a bidirectional synchronous drive mechanism. The first couplings 144 and 146 use a cross-slider structure to compensate for installation errors. The two ends of the first drive shaft 145 are fixed in axial position to the first end caps 147 via bushings 148. When a rotational force is applied at the manual input end, the two first commutators 143 synchronously change the direction of power transmission, driving the two sets of first lead screws 1411 to advance or retract at the same rate, ensuring the straightness of the track slab's X-axis displacement and eliminating the risk of deflection caused by unilateral drive.

[0040] In some embodiments: the Y-axis active adjustment device 14 includes a first commutator 143, a first coupling 144, a first drive shaft 145, a first lead screw 1411, a first lead screw nut 1412, and a hanging plate 1417.

[0041] The first commutator 143 of the Y-axis active adjustment device 14 is connected to the first drive shaft 145 via a first coupling 144. The end of the first drive shaft 145 is linked to the first lead screw 1411 via another coupling 144. The first lead screw 1411 engages with the first lead screw nut 1412 to drive the hanging plate 1417 to move the track plate 4. The hanging plate 1417 is used to connect the track plate 4. During construction, the operator rotates the manual input end of the Y-axis active adjustment device 14. The power is changed in direction by the first commutator 143 and then transmitted to the first lead screws 1411 on both sides by the first drive shaft 145. The first lead screws 1411 push the hanging plate 1417 to move the track plate along the Y-axis. In addition, the Y-axis active adjustment device 14 also includes a first end cover 147, a bushing 148, a cylindrical roller bearing 149, a split cover 1410, a first lead screw nut seat 1413, a through cover 1414, and a thrust ball bearing 1416.

[0042] In some embodiments, the Z-axis active adjustment device 11 includes a third lead screw 1110, a third lead screw nut 117, and an adjustable support leg 112. The end of the adjustable support leg 112 is hinged to a support shoe 113 that matches the curvature of the tunnel segment. The third lead screw nut 111 is connected to the bracket 1 through bolt holes 118. In addition, the Z-axis active adjustment device 11 also includes a housing 111, an extension mechanism 114, a pressure plate 115, a sliding plate 116, bolt holes 118, and bearings 119.

[0043] The third lead screw 1110 of the Z-axis active adjustment device 11 engages with the nut of the third lead screw seat 117. The third lead screw seat 117 is fixed to the mounting plate of the detachable cover 132 through bolt holes 118. The housing 111 of the adjustment mechanism is connected to the detachable cover 132. The upper end of the adjustable support leg 112 is connected to the third lead screw seat 117, and the lower end is hinged to the support shoe 113. The bottom of the support shoe 113 is machined into a groove structure that matches the inner arc surface of the shield tunnel segment 3. When adjusting the Z-axis, rotating the third lead screw 1110 drives the third lead screw corresponding to the third lead screw seat 117 to move the adjustable support leg 112 up and down. The support shoe 113 adapts to the local arc change of the shield tunnel segment 3 through the hinge structure, so that the contact surface between the adjustable support leg 112 and the shield tunnel segment 3 changes from line contact to surface contact. The extension mechanism 114 is located on both sides of the outer casing 111. The pressure plate 115 and the sliding plate 116 constrain the extension mechanism 114 to move up and down within the gap between the two plates. The pressure plate 115 and the sliding plate 116 of the removable cover 132 form a vertical guide groove, constraining the vertical movement trajectory of the adjustable support leg 112 and preventing horizontal deviation during adjustment. The end of the third lead screw 1110 is supported by a bearing 119 for bidirectional load bearing.

[0044] In some implementations: the rolling surface of the cone wheel 254 is a conical structure that matches the sliding surface of the track plate, and the cone wheel 254 is rotatably mounted on the bottom of the guide frame 252 via a bearing.

[0045] The conical rolling surface inclination angle of the conical wheel 254 matches the inclination angle of the guide groove sidewall at the bottom of the track plate 4, ensuring line contact between the conical wheel 254 and the guide groove. The bearing of the conical wheel 254 is a double-row angular contact ball bearing, capable of simultaneously withstanding radial and axial loads. The mounting shaft of the guide frame 252 is secured at both ends with retaining rings to maintain the axial position of the conical wheel 254. The inner ring of the bearing has an interference fit with the mounting shaft, while the outer ring has a clearance fit with the hub of the conical wheel 254, facilitating disassembly and maintenance. The surface of the conical wheel 254 is hardened and coated with a wear-resistant coating to extend the service life of the rolling surface. When the track plate 4 moves in the X direction, the rolling direction of the conical wheel 254 is consistent with the displacement direction of the track plate 4. The radial component force generated by its conical structure presses the track plate 4 firmly against the centerline of the guide frame 252, preventing lateral displacement during adjustment.

[0046] In some embodiments: the outer side of the Y-direction active adjustment device 14 of bracket 1 is provided with a sheet metal cover 142, and the outer side of the X-direction active adjustment device 13 of bracket 1 is provided with a detachable cover 132.

[0047] A sheet metal cover 142 is installed on the outside of the Y-axis active adjustment device 14 of bracket 1. The sheet metal cover 142 is fixed to the frame of bracket 1 by bolts, completely covering the first commutator 143, the first coupling 144, and the first drive shaft 145, exposing only the manual operation crank interface. The edges of the sheet metal cover 142 are bent to form guide grooves to prevent cement slurry from seeping into the interior during construction. The detachable cover 132 of the X-axis active adjustment device 13 is detachably connected by bolts.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A prefabricated track slab manual three-way fine-tuning bracket, characterized in that: The system includes a symmetrically arranged support 1 (1) and support 2 (2). The support 1 (1) is equipped with a Z-axis active adjustment device (11), an X-axis active adjustment device (13) and a Y-axis active adjustment device (14). The support 2 (2) is equipped with a Z-axis active adjustment device (11), a Y-axis active adjustment device (14) and an X-axis passive adjustment device (25). The X-axis active adjustment device (13) includes a second commutator (131), a second coupling (133), a second drive shaft (134) and a second lead screw (1310). The second lead screw (1310) is fixedly installed through a bearing seat (1311). The X-axis passive adjustment device (25) includes a guide frame (252) and a rotatable conical wheel (254).

2. The prefabricated track slab manual three-way fine-tuning bracket according to claim 1, characterized in that: The guide frame (252) of the X-direction passive adjustment device (25) is fixedly connected to the bracket (2) via the connecting plate (253), and the cone wheel (254) is symmetrically arranged along the longitudinal axis of the guide frame (252).

3. The prefabricated track slab manual three-way fine-tuning bracket according to claim 1, characterized in that: The Y-direction active adjustment device (14) includes a first commutator (143), a first coupling (144), a first drive shaft (145), a first lead screw (1411), a first lead screw nut (1412), and a hanging plate (1417).

4. The prefabricated track slab manual three-way fine-tuning bracket according to claim 3, characterized in that: The first nut (1412) of the Y-axis active adjustment device (14) is fixedly installed by the first nut seat (1413). The two ends of the first screw (1411) are supported by cylindrical roller bearings (149) and thrust ball bearings (1416). The first coupling (144) is provided at the end of the first screw (1411) to connect the first drive shaft (145).

5. The prefabricated track slab manual three-way fine-tuning bracket according to claim 4, characterized in that: The first commutator (143) is connected to the first drive shaft (145) through the first coupling (144). Two sets of the first commutators (143) and screw drive assemblies are symmetrically arranged at both ends of the first drive shaft (145).

6. The prefabricated track slab manual three-way fine-tuning bracket according to claim 1, characterized in that: The Z-axis active adjustment device (11) includes a third lead screw (1110), a third lead screw seat (117) and an adjustable support leg (112). The adjustable support leg (112) is hinged at the end with a support shoe (113) that matches the curvature of the shield tunnel segment. The third lead screw seat (117) is connected to the support bracket (1) through a bolt hole (118).

7. The prefabricated track slab manual three-way fine-tuning bracket according to claim 2, characterized in that: The rolling surface of the cone wheel (254) is a conical structure that matches the sliding surface of the track plate. The cone wheel (254) is rotatably mounted on the bottom of the guide frame (252) via a bearing.

8. The prefabricated track slab manual three-way fine-tuning bracket according to claim 1, characterized in that: The X-direction active adjustment device (13) of the bracket (1) is provided with a detachable cover (132) on the outside, and the Y-direction active adjustment device (14) of the bracket (1) is provided with a sheet metal cover (142) on the outside.

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