Urban region railway precast beam lifting and transporting frame construction device and method

Abstract

The invention provides an urban railway precast beam lifting and transporting frame construction device and method, and relates to the technical field of precast beam construction.The urban railway precast beam lifting and transporting frame construction device comprises a bottom frame, the bottom frame is used for bearing the bottom of a precast beam, abutting frames are hinged to the two sides of the bottom frame correspondingly, and each abutting frame can rotate around a hinge point so as to abut against the side wall, close to the bottom, of the precast beam in the width direction; each abutting frame is fixedly connected with a steel wire rope; the two sets of top frames correspond to the abutting frames on the two sides respectively, each set of top frame comprises a clamping frame and a swing frame, the clamping frame is of a U-shaped structure and used for being clamped to the top side edge in the width direction of the precast beam, the swing frame is installed on the clamping frame in a hinged mode, an abutting plate used for abutting against the top of the precast beam is arranged at one end of the swing frame, and a lifting lug is arranged at the other end of the swing frame. Safe and stable construction of the whole lifting, transporting and erecting process of the precast beam can be achieved, and the safety and construction efficiency of urban railway precast beam operation are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precast beam construction, in particular to a city railway precast beam lifting and transporting device and method. BACKGROUND

[0002] In city railway engineering, the precast beam is the main bridge structure component, and its construction process usually includes three main procedures of lifting, transporting and erecting. The existing construction method generally uses steel wire rope binding combined with gantry crane, transport vehicle, bridge erecting machine or crane for overall operation. In the lifting stage, the steel wire rope is usually hoisted by a lifting ring or binding at the lower part of the precast beam; in the transporting stage, the transport vehicle is relied on to travel to the erection position; and in the erecting stage, the bridge erecting machine or crane is used to complete the installation in place. Although this method has the advantages of high construction efficiency and mature equipment cooperation, it also exposes certain safety hazards in actual use.

[0003] On the one hand, due to the smooth surface and sharp corners of the precast beam, the steel wire rope is prone to slip on the side wall of the precast beam during hoisting or transporting, especially when turning, accelerating or decelerating or under uneven force, which is more likely to deviate or fall off, affecting the stability of hoisting and posing a risk of threatening the safety of construction personnel and equipment. On the other hand, the direct contact between the steel wire rope and the precast beam will cause indentation or peeling damage to the corners of the precast beam, affecting the appearance quality and structural integrity of the component. SUMMARY

[0004] The purpose of the present application is to provide a city railway precast beam lifting and transporting device and method, which can realize safe and stable construction of the whole process of precast beam lifting, transporting and erecting, and effectively improve the safety and construction efficiency of city railway precast beam operation.

[0005] In the first aspect, the present application is realized by the following technical scheme: A city railway precast beam lifting and transporting device, comprising: a chassis for supporting the bottom of the precast beam, two sides of the chassis are respectively hinged with abutting frames, each abutting frame can rotate around the hinge point to abut the side wall near the bottom in the width direction of the precast beam, and a steel wire rope is fixedly connected to each abutting frame; a top frame, the top frame is provided with two groups corresponding to the two sides of the abutting frame, each group of the top frame comprises a clamping frame and a swing frame, the clamping frame is in U-shaped structure and is used for clamping the top side edge in the width direction of the precast beam, the swing frame is hingedly installed on the clamping frame, one end of the swing frame is provided with an abutting plate for abutting the top of the precast beam, and the other end of the swing frame is provided with an lifting lug; The end of the steel wire rope away from the abutting frame is connected to the corresponding swing frame, when the lifting lug is pulled upward, the steel wire rope is tightened and kept apart from the precast beam, the abutting frame swings inward and abuts to the precast beam close to the bottom of the side wall.

[0006] Further, the clamping frame is rotationally arranged with a rotating shaft along the length direction, a wire wheel is fixedly arranged on the rotating shaft, the steel wire rope is wound on the wire wheel, an eccentric wheel is also fixedly arranged on the wire wheel, an abutting column is arranged on the eccentric wheel, the abutting column can rotate with the wire wheel and tighten the steel wire rope.

[0007] Further, a first swing lever is fixedly arranged on the rotating shaft, a second swing lever is hingedly arranged on the swing frame, the first swing lever and the second swing lever are hingedly arranged with each other.

[0008] Further, an abutting lever is fixedly arranged on the first swing lever, the abutting lever can swing with the first swing lever and synchronously tighten the steel wire rope, the abutting column is located on the inner side of the steel wire rope, and the abutting lever is located on the outer side of the steel wire rope.

[0009] Further, a positioning groove for positioning the top support of the pier is arranged at the middle position of the base frame, positioning plates are arranged on both sides of the positioning groove, and drive cylinders corresponding to the positioning plates are fixedly arranged on the base frame.

[0010] Further, sliding columns are fixedly arranged at both ends of the positioning plates, and inclined grooves are obliquely formed downward in the side walls of the positioning groove corresponding to the sliding columns, the sliding columns are slidingly arranged in the inclined grooves, elastic blocks are arranged in the inclined grooves, the elastic blocks are in abutment with the sliding columns, and the piston rods of the drive cylinders are in abutment with the positioning plates.

[0011] Further, a containing space for clamping the beam pad is arranged along the length direction at the middle of the base frame. And / or, jacking cylinders are arranged at the four corners of the base frame, and movable wheels are mounted on the output ends of the jacking cylinders. And / or, the abutting frame is arranged in a Y shape, the Y-shaped branches of the abutting frame are respectively used for abutting to the side walls close to the bottom in the width direction of the precast beam and connecting the steel wire rope, and the distal ends of the Y-shaped branches of the abutting frame are hingedly connected with the base frame. And / or, the swing frame comprises rod bodies on both sides and a main rod connecting the rod bodies on both sides, the lifting lug is arranged on the main rod, the rod bodies on both sides are arranged in an obtuse angle, and avoiding grooves are formed in the rod bodies to avoid the clamping frame.

[0012] Further, the chassis comprises a first frame body and a second frame body, the first frame body is provided with an insertion block, the second frame body is provided with a slot corresponding to the insertion block, and the second frame body is provided with a locking piece to fixedly connect the first frame body and the second frame body.

[0013] Further, the length of the first frame body is greater than the length of the second frame body, and the positioning slot is located on the first frame body.

[0014] In a second aspect, the present application is realized by the following technical solutions: A construction method of a city railway prefabricated beam, which adopts the prefabricated beam lifting frame construction device in the above scheme, and comprises the following construction steps: S1, device installation: The pair of chassis is respectively arranged at the position close to the end of the length direction of the bottom of the prefabricated beam, and the two groups of top frames corresponding to the chassis are arranged symmetrically with respect to each other; the abutting frame is rotated around the hinge points on both sides of the chassis through the hinge, and is adjusted to the position close to the bottom side wall in the width direction of the prefabricated beam.

[0015] S2, clamping and fixing and steel wire rope adjustment: The clamping frame is clamped at the top side edge in the width direction of the prefabricated beam, and the position of the swing frame is adjusted so that the abutting plate has a certain gap with the top of the prefabricated beam; then the length of the steel wire rope is adjusted and limited by the rope buckle, so that the steel wire rope maintains a reasonable interval with the prefabricated beam.

[0016] S3, lifting and lifting: According to the actual site and specific requirements, the gantry crane, transport vehicle, bridge erecting machine or crane and other lifting equipment are hung on the lifting lugs on the swing frame, the device is slowly lifted, so that the whole prefabricated beam is lifted, and the lifting and transporting operations of the prefabricated beam are realized.

[0017] S4, erecting and positioning: The prefabricated beam after lifting is moved to the predetermined erecting position stably by controlling the traction mechanism, so that the prefabricated beam is accurately positioned and safely supported.

[0018] S5, device disassembly: After the prefabricated beam is stably seated and supported by the beam supporting pad, the lifting lug is loosened, and the chassis and the top frame assembly are disassembled to complete the lifting frame construction.

[0019] The technical scheme of the present application has at least the following advantages and beneficial effects: 1. The application sets the abutting frame rotating around the hinge point on both sides of the chassis, and connects the swing frame of the top frame through the steel wire rope on the abutting frame. When the lifting lug is pulled upward, the steel wire rope is pulled synchronously, driving the abutting frame to swing inward, so that it is automatically abutted to the bottom side wall of the precast beam. The structure can realize self-adaptive limiting and clamping fixing of the precast beam during hoisting, effectively avoiding the loosening and slipping problem caused by size error or deflection of the precast beam in the traditional lifting device, thereby improving the stability and safety of the overall hoisting.

[0020] 2. The combination design of the U-shaped clamping frame of the top frame and the swing frame forms a bidirectional constraint structure of upper clamping and lower abutting of the top of the precast beam during lifting, which not only ensures the positioning accuracy of the precast beam in vertical and horizontal directions, but also realizes self-adjustment through the micro-angle swing of the swing frame during stress process, reducing local stress concentration. The design structure is simple, easy to install, and can safely and stably complete the lifting and erection of the whole process of the construction of the precast beam of the urban railway, significantly improving the operation efficiency and safety and reliability in the hoisting process.

[0021] 3. Since one end of the steel wire rope is fixed to the swing frame and maintains a set distance between the precast beam side wall during lifting, the steel wire rope is always in a stressed state with the precast beam, thereby avoiding friction or scratching between the steel wire rope and the beam side wall. The design not only prevents damage to the surface of the precast beam, but also prolongs the service life of the steel wire rope, further improving the safety and reliability of the device in long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The overall structure schematic diagram of the urban railway precast beam lifting and transporting frame construction device provided by the application is installed on the precast beam; Figure 2 The local schematic diagram of the urban railway precast beam lifting and transporting frame construction device provided by the application is installed on the precast beam; Figure 3 The Figure 2 The enlarged view of part A; Figure 4 The explosion diagram of the first frame body and the second frame body of the application; Figure 5 The Figure 4 The enlarged view of part B; Figure 6 The explosion diagram of the abutting frame, the bottom frame and the top frame of the application; Figure 7 The structure schematic diagram of the positioning plate and the elastic block of the application; Figure 8 The state schematic diagram of the positioning plate moving along the chute under the driving of the driving cylinder of the application; Figure 9 The structure diagram of the top frame is shown for the present application; Figure 10 The exploded view of the top frame is shown for the present application; Figure 11 The structure diagram of the accommodating space of the bottom frame clamped on the bearing pad of the transport vehicle is shown for the present application; Figure 12 The structure diagram of the positioning groove of the bottom frame aligning the abutment of the pier to fall the beam is shown for the present application; 100 - bottom frame, 100a - positioning groove, 100b - inclined groove, 100c - accommodating space, 110 - abutting frame, 111 - second hoisting rod, 121 - elastic block, 130 - first frame body, 131 - plug block, 140 - second frame body, 141 - plug groove, 150 - locking piece, 160 - outer frame, 200 - steel wire rope, 210 - rope buckle, 300 - top frame, 310 - clamping frame, 311 - rotating shaft, 3111 - wire wheel, 3112 - eccentric wheel, 3113 - abutting column, 312 - shaft seat, 313 - first swing lever, 3131 - abutting rod, 314 - second swing lever, 320 - swing frame, 321 - abutting plate, 322 - lifting lug, 330 - rod body, 331 - main rod, 3311 - avoiding groove, 332 - first hoisting rod, 400 - positioning plate, 401 - sliding column, 410 - driving cylinder, 500 - jacking cylinder, 510 - movable wheel, 600 - transport vehicle, 610 - bearing pad, 700 - pier, 710 - abutment, 800 - flat plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. EMBODIMENT

[0025] The following refers to Figures 1-12As shown, further illustrated in combination with the specific embodiments, the embodiment provides a city railway prefabricated beam delivery frame construction device, which comprises a base frame 100, an abutting frame 110, a top frame 300, a steel wire rope 200 transmission system and other main structures.

[0026] The base frame 100 is provided in a frame structure and used for supporting the bottom of the prefabricated beam. A plate body (not shown in the figure) is welded to the top wall of the base frame 100 and in contact with the bottom plane of the prefabricated beam, so as to ensure uniform stress and stable adhesion. The base frame 100 is made of high-strength steel material to enhance the bending and shear resistance of the whole. The base frame 100 is hingedly connected with the abutting frame 110 on both sides. Each abutting frame 110 can rotate freely around the hinge point, which is provided as a shaft, so that it can be flexibly abutted on the side wall near the bottom in the width direction of the prefabricated beam. A plurality of steel wire ropes 200 are fixedly connected to each abutting frame 110. The steel wire ropes 200 are arranged in parallel along the length direction of the beam and are locked by rope buckles 210 to improve the uniformity of the stress distribution and the stability of the overall lifting process.

[0027] The abutting frame 110 is provided in a Y-shaped structure. One branch of the Y-shaped structure is used for abutting the side wall near the bottom in the width direction of the prefabricated beam, and the other branch is used for connecting the steel wire ropes 200. The abutting frame 110 is fixedly welded with a flat plate 800 on the side near the side wall of the prefabricated beam. The flat plate 800 is in plane adhesion with the concrete side wall of the prefabricated beam and can effectively disperse the local contact pressure when stressed to prevent the damage of the side angle of the prefabricated beam caused by point contact. The distal end of the Y-shaped branch of the abutting frame 110 is hingedly connected with the base frame 100. A second lifting rod 111 is transversely fixed on one of the Y-shaped branches. A limiting groove is arranged on the lifting rod to prevent the steel wire rope 200 from slipping. The steel wire rope 200 is tied on the second lifting rod 111, so that its tension direction is more fixed and will not be shifted or dislocated.

[0028] In order to meet the requirements of short-distance transportation and height adjustment of the prefabricated beam before erection, an outer frame 160 is fixedly welded to the four corners of the base frame 100. A jacking cylinder 500 is vertically installed on the outer frame 160, and a movable wheel 510 is installed on the output end of the jacking cylinder 500. The overall height of the base frame 100 can be adjusted by the extension and retraction of the cylinder to realize the stable lifting or in-place support of the prefabricated beam. Meanwhile, the movable wheel 510 can be switched between the support and transfer states to improve the flexibility of the device.

[0029] The top frame 300 is provided in two groups corresponding to the two side abutting frames 110 respectively. Each group of top frame 300 includes two parts of clamping frame 310 and swing frame 320. The clamping frame 310 is in U-shaped structure, used for clamping at the top side edge in the width direction of the precast beam, and the inner side of both ends is provided with anti-slip pad, which can prevent direct friction between metal and concrete when stressed, and improve stability. The swing frame 320 is hingedly installed on the clamping frame 310, one end of which is provided with an abutting plate 321 for abutting the top of the precast beam, and the other end is provided with lifting lugs 322, which can be provided with multiple lifting lugs 322 according to the beam weight and lifting point position to disperse the stress. When the lifting lugs 322 are pulled by the overhead lifting equipment, the steel wire rope 200 is simultaneously tensioned, and maintains a spaced state with the side wall of the precast beam, driving the abutting frame 110 to swing inward and abut tightly to the side wall near the bottom of the precast beam, forming an upper, lower and side three-way force stable structure.

[0030] In different embodiments, in order to prevent the steel wire rope 200 from scratching or scraping the side wall of the precast beam during tensioning, a guide pulley assembly can be provided near the abutting frame 110, so that the steel wire rope 200 always maintains a fixed angle and runs with a predetermined gap from the outer surface of the precast beam. This design avoids the wear of the precast beam corner due to high tension of the steel wire rope 200 during lifting, significantly improving the surface integrity and construction safety of the precast beam. In addition, the triangular stable tension structure formed by the steel wire rope 200 and the abutting frame 110 can automatically disperse the stress during lifting, improving the overall torsional and anti-deviation performance.

[0031] Referring to Figure 3 , Figure 9 and Figure 10 , the clamping frame 310 is rotatably provided with a rotating shaft 311 through an axle seat 312 along the length direction, and a wire wheel 3111 is fixedly installed on the rotating shaft 311, and the steel wire rope 200 is wound on the wire wheel 3111. A pair of eccentric wheels 3112 is also fixed on both sides of the wire wheel 3111, and an abutting column 3113 is welded between the pair of eccentric wheels 3112. The abutting column 3113 can tension the steel wire rope 200 while the wire wheel 3111 rotates, achieving automatic adjustment. A first swing lever 313 is fixedly installed on the rotating shaft 311, and a second swing lever 314 is hingedly installed on the swing frame 320. The two are hingedly connected, and when the lifting lug 322 is pulled, the rotating shaft 311 can be rotated, thereby actively rotating the wire wheel 3111 and tensioning the steel wire rope 200 by the abutting column 3113, achieving synchronous locking effect. Further, an abutting rod 3131 is fixedly provided on the first swing lever 313, which can rotate synchronously with the swing lever to further improve the tensioning stability of the steel wire rope 200.

[0032] Referring to Figure 8As shown, the middle part of the base frame 100 is provided with a positioning groove 100a for positioning the top support 710 of the pier 700, and the positioning plates 400 are slidingly installed on both sides of the positioning groove 100a. The base frame 100 is fixed with a driving cylinder 410, and the piston rod is in abutting connection with the positioning plate 400. The slide column 401 is installed at both ends of the positioning plate 400 and slidingly arranged in the inclined groove 100b of the side wall of the positioning groove 100a. The elastic block 121 is arranged in the inclined groove 100b for automatic resetting when loosened. The extension and retraction of the driving cylinder 410 can drive the positioning plates 400 on both sides to move inwardly or extend downwardly, so as to adapt to different specifications of the support 710, realize quick centering, limiting and stable support.

[0033] As an optional embodiment, the middle part of the base frame 100 is provided with a containing space 100c for clamping the beam supporting cushion block 610 of the transport vehicle 600. After lifting the precast beam, the containing space 100c can be directly clamped on the beam supporting cushion block 610 of the transport vehicle 600, so as to realize stable limiting and multiplexing of the lifting appliance, and facilitate quick scene change.

[0034] In the embodiment, the swing frame 320 includes two side rod bodies 330 and a main rod 331 connecting the two side rod bodies 330, and the lifting lug 322 is arranged on the main rod 331. The two side rod bodies 330 are arranged in an obtuse angle and can provide a more stable force arm when pulled. The rod body 330 is provided with an avoiding groove 3311 to form a structure avoiding the clamping frame 310, so that the abutting plate 321 can better fit the top surface of the precast beam. The first lifting rod 332 is transversely fixedly connected to the rod body 330, and the lifting rod is provided with a clamping groove for preventing the steel wire rope 200 from slipping. The steel wire rope 200 is fixed on the lifting rod by binding, and when the lifting lug 322 is lifted and pulled, the steel wire rope 200 can be synchronously pulled tight, so as to realize stable and smooth force transmission.

[0035] Referring to Figure 4 and Figure 5 As shown, the base frame 100 includes a first frame body 130 and a second frame body 140. The first frame body 130 is provided with an insertion block 131, and the second frame body 140 is provided with an insertion slot 141 corresponding to the insertion block 131. The insertion block 131 is of an elongated rectangular structure to ensure the connection depth and stability. After insertion, the base frame 100 is fixed by a pin locking piece 150, so as to form a detachable integral connection structure. In other embodiments, the same fixing function can also be realized by using bolts or wedge-shaped locks. The length of the first frame body 130 is greater than the length of the second frame body 140, and the positioning groove 100a is arranged on the first frame body 130 to enhance the overall rigidity and centering accuracy of the connection area, thereby improving the structural stability of the lifting and transporting frame under overall stress. Embodiment

[0036] The application further provides a construction method of the urban railway prefabricated beam. S1, device installation: The pairs of the bottom frames 100 are respectively arranged at positions close to the end of the length direction of the bottom of the prefabricated beam, and the two groups of the top frames 300 corresponding to the bottom frames 100 are arranged symmetrically with each other; the abutting frames 110 are adjusted to positions close to the bottom side wall of the prefabricated beam in the width direction by being rotated around the hinge joints on the two sides of the bottom frames 100 through the hinge connection.

[0037] S2, clamping and fixing and steel wire rope 200 adjustment: The clamping frames 310 are clamped at the top side edges of the prefabricated beam in the width direction, and the positions of the swing frames 320 are adjusted so that the abutting plates 321 have a certain gap with the top of the prefabricated beam; then the length of the steel wire rope 200 is adjusted and limited by the rope buckle 210, so that the steel wire rope 200 maintains a reasonable interval with the prefabricated beam.

[0038] S3, lifting and transporting: According to the actual site and specific requirements, the gantry crane, the transport vehicle 600, the bridge erecting machine or the crane and other hoisting equipment are hung on the lifting lugs 322 on the swing frames 320, the device is slowly lifted, so that the prefabricated beam is lifted as a whole, and the beam lifting and beam transporting operations of the prefabricated beam are realized.

[0039] S4, erecting and positioning: The prefabricated beam after being lifted is smoothly moved to the predetermined erecting position by controlling the traction mechanism, so that the prefabricated beam is accurately positioned and safely supported.

[0040] S5, device disassembly: After the prefabricated beam is stably seated and supported by the beam supporting pad 610, the lifting lugs 322 are loosened, and the bottom frame 100 and the top frame 300 assemblies are disassembled, so that the beam lifting and transporting construction is completed.

[0041] The above is only a preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A precast beam lifting and erection construction device for urban railways, characterized in that, include: A base frame (100) is used to support the bottom of the precast beam. Abutment frames (110) are hinged to both sides of the base frame (100). Each abutment frame (110) can rotate around the hinge point to abut against the side wall of the precast beam near the bottom in the width direction. A steel wire rope (200) is fixedly connected to each abutment frame (110). The top frame (300) is provided in two sets, which correspond to the abutment frames (110) on both sides respectively. Each set of the top frame (300) includes a snap-fit ​​frame (310) and a swing frame (320). The snap-fit ​​frame (310) has a U-shaped structure and is used to snap onto the top side edge of the precast beam in the width direction. The swing frame (320) is hinged to the snap-fit ​​frame (310). One end of the swing frame (320) is provided with an abutment plate (321) for abutting the top of the precast beam, and the other end is provided with a lifting lug (322). The end of the wire rope (200) away from the abutment frame (110) is connected to the corresponding swing frame (320). When the lifting lug (322) is pulled upward, the wire rope (200) is tightened and kept at a distance from the precast beam, causing the abutment frame (110) to swing inward and abut against the side wall of the precast beam near the bottom.

2. The precast beam lifting and erection construction device for urban railways according to claim 1, characterized in that, The clip frame (310) is rotatably provided with a rotating shaft (311) along its length. A spool (3111) is fixedly provided on the rotating shaft (311). The wire rope (200) is wound around the spool (3111). An eccentric wheel (3112) is also fixedly provided on the spool (3111). An abutment post (3113) is provided on the eccentric wheel (3112). The abutment post (3113) can rotate with the spool (3111) and tension the wire rope (200).

3. The precast beam lifting and erection construction device for urban railways according to claim 2, characterized in that, A first swing arm (313) is fixedly mounted on the rotating shaft (311), and a second swing arm (314) is hinged to the swing frame (320). The first swing arm (313) and the second swing arm (314) are hinged to each other.

4. The precast beam lifting and erection construction device for urban railways according to claim 3, characterized in that, A connecting rod (3131) is fixedly provided on the first swing rod (313). The connecting rod (3131) can synchronously tension the wire rope (200) as the first swing rod (313) swings. The connecting post (3113) is located on the inner side of the wire rope (200), and the connecting rod (3131) is located on the outer side of the wire rope (200).

5. The precast beam lifting and erection construction device for urban railways according to claim 1, characterized in that, The base frame (100) is provided with a positioning groove (100a) for positioning the top support (710) of the bridge pier (700) at the middle position. Positioning plates (400) are provided on both sides of the positioning groove (100a). A drive cylinder (410) corresponding to the positioning plate (400) is fixedly provided on the base frame (100).

6. The precast beam lifting and erection construction device for urban railways according to claim 5, characterized in that, The positioning plate (400) has sliding columns (401) fixedly installed at both ends. The positioning groove (100a) is provided with a downward inclined groove (100b) corresponding to the side wall of the sliding column (401). The sliding column (401) is slidably installed in the inclined groove (100b). An elastic block (121) is provided in the inclined groove (100b). The elastic block (121) abuts against the sliding column (401). The piston rod of the driving cylinder (410) abuts against the positioning plate (400).

7. The precast beam lifting and erection construction device for urban railways according to claim 1, characterized in that, The base frame (100) has a receiving space (100c) along its length in the middle for receiving the bearing beam pad (610); And / or, lifting cylinders (500) are provided at the four corners of the base frame (100), and movable wheels (510) are installed at the output end of the lifting cylinders (500); And / or, the abutment frame (110) is Y-shaped, and the Y-shaped branches of the abutment frame (110) are respectively used to abut the side wall near the bottom in the width direction of the precast beam and to connect the wire rope (200). The far end of the Y-shaped branch of the abutment frame (110) is hinged to the base frame (100). And / or, the swing frame (320) includes two rods (330) on both sides and a main rod (331) connecting the two rods (330). The lifting lug (322) is provided on the main rod (331). Both rods (330) on both sides are bent at an obtuse angle. The rods (330) are provided with a clearance groove (3311) to avoid the snap-fit ​​bracket (310).

8. The precast beam lifting and erection construction device for urban railways according to claim 5, characterized in that, The base frame (100) includes a first frame (130) and a second frame (140). The first frame (130) is provided with a plug (131), and the second frame (140) is provided with a slot (141) corresponding to the plug (131). The second frame (140) is provided with a locking member (150) to fix the first frame (130) and the second frame (140) together.

9. The precast beam lifting and erection construction device for urban railways according to claim 8, characterized in that, The length of the first frame (130) is greater than the length of the second frame (140), and the positioning groove (100a) is located on the first frame (130).

10. A construction method for precast beams of urban railways, employing the precast beam lifting and transporting construction device for urban railways as described in any one of claims 1-9, characterized in that, The construction steps include the following: S1. Device Installation: The paired base frames (100) are placed near the end of the bottom of the precast beam along the length direction, and the two sets of top frames (300) corresponding to the base frames (100) are arranged symmetrically to each other. The abutment frame (110) is able to rotate around the hinge points on both sides of the base frame (100) and be adjusted to a position close to the bottom side wall of the precast beam in the width direction. S2. Clip-on fixing and wire rope (200) adjustment: The clip-on bracket (310) is clipped onto the top side edge of the precast beam in the width direction, and the position of the swing bracket (320) is adjusted so that the abutment plate (321) has a certain gap with the top of the precast beam. Then the length of the wire rope (200) is adjusted and limited by the rope buckle (210) so that the wire rope (200) maintains a reasonable distance from the precast beam. S3. Lifting and Transporting: According to the actual site and specific needs, the lifting lugs (322) attached to the swing frame (320) are used by gantry cranes, transport vehicles (600), bridge erecting machines or cranes to slowly lift the device, thereby driving the precast beam to be lifted as a whole, so as to realize the lifting and transporting of the precast beam. S4. Setup and Positioning: By controlling the traction mechanism, the precast beams after being lifted are smoothly moved to the predetermined erection position, so as to achieve precise positioning and safe support of the precast beams; S5. Device disassembly: After the precast beam is stably seated and supported by the beam support block (610), the lifting lug (322) is released, and the base frame (100) and top frame (300) components are disassembled to complete the lifting frame construction.

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