A hoisting device for precast box girders of viaducts

Abstract

The present invention relates to the field of box girder hoisting, and more particularly to a hoisting device for precast box girders of a viaduct. A support platform is fixedly connected to the lower end of a towing rope. A jacking mechanism is arranged on the top surface of the support platform, and a support block is fixedly connected to the output end of the jacking mechanism; ropes are fixedly connected to the four parts on the support block, and the four ropes penetrate through the support platform. A set of lifting ropes is arranged on each of the left and right sides of the bottom surface of the support platform; a transverse positioning device is clamped at the upper part of the middle of the precast box girder, and longitudinal positioning devices are fixedly connected to both the left and right sides of the precast box girder; the two sets of lifting ropes are wound and connected to the left and right parts of the precast box girder; the ends of the front and rear ropes are respectively connected to two push plate control mechanisms; the ends of the left and right ropes are respectively connected to the hydraulic control mechanisms on both sides; the transverse positioning device is used to position and limit the left and right sides of the precast box girder with respect to the pile body, and the longitudinal positioning device is used to position and limit the distance between the precast box girders, reducing the adjustment difficulty for small deviations during the hoisting of the precast box girder.

Description

Technical Field

[0001] The invention relates to the field of box girder hoisting, and more specifically to a hoisting device for a prefabricated box girder of a viaduct. Background Art

[0002] A box girder is a type of beam used in bridge engineering. It is hollow inside and has flanges on both sides of the upper part. Box girders with reinforced concrete structures are divided into prefabricated box girders and cast-in-place box girders. Box girders prefabricated in an independent site can be erected in conjunction with a bridge-erecting machine after the lower project is completed, which can speed up the project progress and save construction time.

[0003] Prefabricated box girders are often used in the laying of viaducts. Cranes need to lift the prefabricated box girders to the designated position. During the descent of the prefabricated box girders, small deviations are prone to occur. Such small deviations are not easy to correct by adjusting the crane, which results in a long time spent on deviation correction, resulting in reduced work efficiency. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a hoisting device for prefabricated box girders of viaducts, which can realize the positioning and limitation of the left and right sides of the pile body by the transverse positioning device, and the positioning and limitation of the distance between the prefabricated box girders by the longitudinal positioning device, thereby reducing the difficulty of adjusting small deviations when hoisting the prefabricated box girders and improving work efficiency.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A lifting device for a prefabricated box girder of an elevated bridge comprises a traction rope, the upper end of which is fixedly connected to a lifting ring, the lower end of which is fixedly connected to a support platform, a jacking mechanism is arranged on the top surface of the support platform, the output end of the jacking mechanism is fixedly connected to a support block, and the traction rope passes through the support block; the front, rear, left and right parts of the support block are all fixedly connected to pull ropes, four pull ropes pass through the support platform, and a group of lifting ropes is respectively arranged on the left and right sides of the bottom surface of the support platform; a transverse positioning device is clamped on the upper end of the middle part of the prefabricated box girder, and the left and right sides of the prefabricated box girder are fixedly connected to longitudinal positioning devices; two groups of lifting ropes are wound and connected to the left and right parts of the prefabricated box girder; the front part of the transverse positioning device is connected to the front part of the transverse positioning device. A push plate control mechanism is provided at each of the rear two ends, and a push plate is slidably connected to the push plate control mechanism, and the ends of the front and rear pull ropes are respectively connected to the two push plate control mechanisms; a hydraulic control mechanism is provided on the longitudinal positioning device, and a column block is slidably connected in the hydraulic control mechanism, and the ends of the left and right pull ropes are respectively connected to the hydraulic control mechanisms on both sides; when the jacking mechanism is output, the pull rope is pulled up by the support block, and the front and rear pull ropes drive the push plates to move toward each other through the push plate control mechanism until they are clamped on the front and rear sides of the pile body, and the left and right pull ropes drive the two column blocks to move away from each other through the hydraulic control mechanism and are clamped on the sides of the prefabricated box girders on the adjacent two sides.

[0007] Furthermore, a connecting rope is provided in the middle of the bottom surface of the supporting platform. The lower end of the connecting rope is fixedly connected with a sub-rope support; a number of sub-rope points are arranged on the sub-rope support, pulleys are arranged at the sub-rope points, the pulling rope bypasses the pulleys at the corresponding positions and is connected with the hydraulic control mechanism, and the lifting rope bypasses the pulleys at the corresponding positions and is connected with the push plate control mechanism, so that the pulling rope and the lifting rope are not easily entangled.

[0008] Furthermore, the lateral positioning device includes a U-shaped frame. Plug plates for supporting the precast box girder are slidably connected to the left and right vertical arms of the U-shaped frame, and the plug plates are horizontally arranged; rectangular grooves (603) are opened at the lower ends of both vertical arms, the openings of the rectangular grooves face downward, the push plate control mechanism includes a rectangular plate slidably connected in the rectangular groove, and a first compression spring is further arranged in the rectangular groove. The upper end of the first compression spring is connected to the top surface of the rectangular groove, and the lower end abuts against the upper end of the rectangular plate. The lower end of the rectangular plate is fixedly connected with a rectangular block, the rectangular block is horizontally arranged, a strip-shaped groove and a U-shaped groove are opened on the rectangular block, the opening of the strip-shaped groove faces inward, one end of the U-shaped groove communicates with the strip-shaped groove, and the other end opens outward; a push plate is slidably connected in the middle of the strip-shaped groove, a nylon rope is arranged in the U-shaped groove, one end of the nylon rope is fixedly connected with the push plate, and the other end is fixedly connected with a T-shaped rod; the end parts of the front and rear pulling ropes are respectively connected to the T-shaped rods of the two push plate control mechanisms; so that small deviations in the front and rear positions of the precast box girder can be quickly adjusted.

[0009] Furthermore, a rectangular protrusion is opened at the upper end of the rectangular plate, and a strip-shaped protrusion is opened on the side of the lower end of the push plate away from the backing plate, so that the rectangular plate is not easily disengaged from the middle of the rectangular groove, and the push plate is not easily disengaged from the middle of the chute.

[0010] Furthermore, a backing plate is fixedly connected to the end of the push plate, and the backing plate and the push plate are arranged in a T shape.

[0011] Furthermore, the longitudinal positioning device includes a cylindrical shell detachably connected to the side surface of the precast box girder. The cylindrical shell is open on the side away from the precast box girder. A second compression spring is arranged in the cylindrical shell. A cylindrical block is slidably connected in the cylindrical shell. A rubber plug is fixedly connected to one end of the cylindrical block close to the second compression spring; both the cylindrical block and the rubber plug are slidably and sealingly connected to the cylindrical shell, and a liquid filling cavity is formed between the cylindrical shell, the cylindrical block and the rubber plug; the hydraulic control mechanism includes a liquid passing pipe communicated with the liquid filling cavity. The upper end of the liquid passing pipe is fixedly connected with a liquid storage bin communicated with the liquid passing pipe. A liquid blocking block is slidably and sealingly connected to the middle of the liquid storage bin. A blocking block is clamped at one end of the liquid storage bin away from the liquid passing pipe; when the blocking block is inserted into the liquid storage bin, the second compression spring is compressed, and the cylindrical block contracts into the cylindrical shell.

[0012] Furthermore, the liquid filling cavity is filled with hydraulic oil, and the viscosity of the hydraulic oil is between 3200-3800 CP, so that the flow rate of the hydraulic oil through the liquid passing pipe is slow, so that the movement speed of the cylindrical block is low, and the movement of the precast box girder is prevented from being too fast and causing instability.

[0013] Furthermore, connection lugs are provided on the cylindrical shell, and the cylindrical shell is detachably connected to the side of the precast box girder through the connection lugs; it is convenient for disassembly and connection.

[0014] Furthermore, the aperture of the liquid passing pipe is less than two millimeters; the liquid passing pipe can reduce the flow rate of the hydraulic oil passing through, and the rubber plug can block the middle part of the cylindrical shell.

[0015] Furthermore, the liquid blocking block is made of waterproof rubber; the hydraulic oil can flow from the shell into the liquid storage bin through the liquid passing pipe, and the liquid blocking block can prevent the leakage of the hydraulic oil. Advantageous Effects

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] (1) In this solution, the lateral positioning device is used to position and limit the left and right sides of the pile body by the precast box girder, and the longitudinal positioning device is used to position and limit the distance between the precast box girders, reducing the adjustment difficulty for small deviations during the hoisting of the precast box girder and improving the work efficiency.

[0018] (2) The lateral positioning device can quickly adjust the small left and right deviations of the precast box girder, and the longitudinal positioning device can quickly adjust the small front and rear deviations of the precast box girder. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the hoisting device for the precast box girder of the viaduct in the present invention;

[0020] Figure 2 It is a schematic diagram of the connection structure of the hoisting device for the precast box girder of the viaduct in the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the rope splitting bracket in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the lateral positioning device in the present invention;

[0023] Figure 5 It is a half-sectional structure schematic diagram of the lateral positioning device in the present invention;

[0024] Figure 6 It is Figure 5 The enlarged structure schematic diagram at A in

[0025] Figure 7 It is a schematic diagram of the structure of the longitudinal positioning device in the present invention;

[0026] Figure 8 It is a half-sectional structure schematic diagram of a part of the longitudinal positioning device in the present invention;

[0027] Figure 9 This is the state diagram during the hoisting of the precast box girder of the viaduct in the present invention;

[0028] Figure 10 This is the state diagram during the hoisting of another precast box girder of the viaduct in the present invention;

[0029] Figure 11 is Figure 10 the enlarged structural schematic diagram at position B in

[0030] Figure 12 This is the schematic diagram of the working principle of the longitudinal positioning device of the present invention;

[0031] Figure 13 This is the side view structural schematic diagram during the hoisting of the precast box girder of the viaduct in the present invention;

[0032] Figure 14 is Figure 13 the enlarged structural schematic diagram at position C in

[0033] Figure 15 This is the schematic diagram of the working principle of the transverse positioning device of the present invention.

[0034] Description of reference numerals in the figure:

[0035] 1. Towing rope; 2. Suspension ring; 3. Support platform; 4. Rope splitting bracket; 5. Precast box girder; 6. Transverse positioning device; 601. U-shaped frame; 602. Insert plate; 603. Rectangular groove; 604. First compression spring; 605. Rectangular plate; 606. Rectangular block; 607. Pusher plate; 608. Cushion plate; 609. Nylon rope; 610. T-shaped rod; 7. Longitudinal positioning device; 701. Cylindrical housing; 702. Second compression spring; 703. Cylindrical block; 704. Rubber plug; 705. Liquid passing pipe; 706. Liquid storage bin; 707. Liquid blocking block; 708. Stopper block; 8. Electric push rod; 9. Support block; 10. Pulling rope; 11. Hoisting rope; 12. Connecting rope; 13. Roadbed; 14. Pile body. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside the adapter model element. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Please refer to Figure 1-15 , a lifting device for precast box girders of viaducts. A lifting device for precast box girders of viaducts includes a towing rope 1. The upper end of the towing rope 1 is fixedly connected with a lifting ring 2, and the lower end of the towing rope 1 is fixedly connected with a support platform 3. A jacking mechanism is arranged on the top surface of the support platform 3, and the output end of the jacking mechanism is fixedly connected with a support block 9. In this embodiment, the jacking mechanism can adopt a push rod, a cylinder and other jacking devices that can be thought of by those skilled in the art. When a push rod is adopted, there are four, which are respectively arranged at the four corners of the top surface of the support platform 3. A first through hole is arranged at the center position of the support block 9, and the towing rope 1 passes through the support block 9 through the first through hole. Pulling ropes 10 are fixedly connected to the front, rear, left and right parts of the support block 9. Second through holes corresponding to the pulling ropes 10 are arranged on the support platform 3, and the four pulling ropes 10 pass through the support platform 3 through the corresponding second through holes. A set of lifting ropes 11 is arranged on each of the left and right sides of the bottom surface of the support platform 3. One set can be 1 or 2 ropes. When there is 1 lifting rope 11, the lifting rope 11 is arranged in a U shape and is connected to the bottom surface of the support platform 3 at both ends at intervals. When there are 2 lifting ropes 11, the upper ends of the two lifting ropes 11 are connected to the bottom surface of the support platform 3 at intervals, and the lower ends are tied manually. A transverse positioning device 6 is clamped at the upper part of the middle of the precast box girder 5, and longitudinal positioning devices 7 are fixedly connected to both the left and right sides of the precast box girder 5. The two sets of lifting ropes 11 are wound and connected to the left and right parts of the precast box girder 5 to lift the precast box girder 5. A push plate control mechanism is arranged at each of the front and rear ends of the transverse positioning device 6. A push plate 607 is slidably connected to the push plate control mechanism. The end parts of the front and rear two pulling ropes 10 are respectively connected to the two push plate control mechanisms. A hydraulic control mechanism is arranged on the longitudinal positioning device 7. A cylindrical block 703 is slidably connected in the hydraulic control mechanism. The end parts of the left and right two pulling ropes 10 are respectively connected to the hydraulic control mechanisms on both sides.

[0040] During use, the jacking mechanism outputs, and drives the pulling rope 10 to pull up through the supporting block 9. The front and rear pulling ropes 10 drive the push plate 607 to move towards each other through the push plate control mechanism, until it is clamped on the front and rear sides of the pile body 14. The left and right pulling ropes 10 drive the two cylindrical blocks 703 to move away from each other through the hydraulic control mechanism, and are clamped on the side edges of the adjacent precast box girders 5.

[0041] Please refer to Figure 3 , a connecting rope 12 is provided in the middle of the bottom surface of the support table 3. The lower end of the connecting rope 12 is fixedly connected with a sub-rope support 4; in this embodiment, at least 6 sub-rope points are provided on the sub-rope support 4. Pulleys are rotatably connected at the sub-rope points. The pulling rope 10 bypasses the pulleys at the corresponding positions and is connected to the hydraulic control mechanism, and the lifting rope 11 bypasses the pulleys at the corresponding positions and is connected to the push plate control mechanism; so that the pulling rope 10 and the lifting rope 11 are not easily entangled.

[0042] Please refer to Figure 4-6 , the lateral positioning device 6 includes a U-shaped frame 601. Insertion plates 602 for supporting the precast box girder 5 are slidably connected to the left and right vertical arms of the U-shaped frame 601. The insertion plates 602 are horizontally arranged; rectangular grooves 603 are opened at the lower ends of the two vertical arms. The rectangular grooves 603 open downward. The push plate control mechanism includes a rectangular plate 605 slidably connected in the rectangular groove 603. A first compression spring 604 is also provided in the rectangular groove 603. The upper end of the first compression spring 604 is connected to the top surface of the rectangular groove 603, and the lower end abuts against the upper end of the rectangular plate 605. The lower end of the rectangular plate 605 is fixedly connected with a rectangular block 606. The rectangular block 606 is horizontally arranged. A strip-shaped groove and a U-shaped groove are opened in the rectangular block 606. The strip-shaped groove opens inward (on the opposite side of the two rectangular blocks 606), and one end of the U-shaped groove communicates with the strip-shaped groove, and the other end opens outward (on the opposite side of the two rectangular blocks 606); a push plate 607 is slidably connected in the middle of the strip-shaped groove. A nylon rope 609 is provided in the U-shaped groove. One end of the nylon rope 609 is fixedly connected to the push plate 607, and the other end is fixedly connected to the end of the horizontal rod of the T-shaped rod 610. The vertical rod of the T-shaped rod 610 is used for limiting; the end parts of the front and rear pulling ropes 10 are respectively connected to the T-shaped rods 610 of the two push plate control mechanisms. A backing plate 608 is fixedly connected to the end of the push plate 607. The backing plate 608 and the push plate 607 are arranged in a T shape.

[0043] Please refer to Figure 15 , the working principle of the lateral positioning device 6 is that the pulling rope 10 pulls the T-shaped rod 610, pulls the nylon rope 609 out of the U-shaped groove. At the same time, the nylon rope 609 pulls the push plate 607, so that the push plate 607 slides along the strip-shaped groove towards the opposite side of the two rectangular blocks 606, slides out of the strip-shaped groove, and is clamped on the pile body 14. The precast box girder 5 is limited to the middle line position of the pile body 14 through the lateral positioning device 6.

[0044] Preferably, a plurality of jacks are arranged at intervals on the left and right vertical arms of the U-shaped frame 601. The jacks at appropriate positions can be selected according to the thickness of the precast box girder, and the insertion plate 602 is inserted. At the same time, a limiting lug is arranged at the outer end of the insertion plate 602 for limiting and preventing slipping off. A rectangular protrusion is provided at the upper end of the rectangular plate 605, so that the rectangular plate 605 is not easily disengaged from the middle of the rectangular groove 603. And a first strip-shaped protrusion is provided at the lower end of the push plate 607 on the side far from the backing plate 608, and a second strip-shaped protrusion is provided corresponding to the first strip-shaped protrusion at the opening of the strip-shaped groove, so that the push plate 607 is not easily disengaged from the strip-shaped groove.

[0045] Please refer to Figure 7 、 8 、12, the longitudinal positioning device 7 includes a cylindrical housing 701 detachably connected to the side of the precast box girder 5. The cylindrical housing 701 is open on the side far from the precast box girder 5. A second compression spring 702 is arranged in the cylindrical housing 701. A cylindrical block 703 is slidably connected in the cylindrical housing 701. A rubber plug 704 is fixedly connected to one end of the cylindrical block 703 close to the second compression spring 702. Both the cylindrical block 703 and the rubber plug 704 are slidably and sealingly connected to the cylindrical housing 701. A liquid filling cavity is formed between the cylindrical housing 701, the cylindrical block 703 and the rubber plug (704). The liquid filling cavity is filled with hydraulic oil. The hydraulic control mechanism includes a liquid passing pipe 705 communicated with the liquid filling cavity. The upper end of the liquid passing pipe 705 is fixedly connected with a liquid storage bin 706 communicated with the liquid passing pipe 705. A liquid blocking block 707 is slidably and sealingly connected to the middle of the liquid storage bin 706. A blocking block 708 is clamped at one end of the liquid storage bin 706 far from the liquid passing pipe 705. In this embodiment, the viscosity of the hydraulic oil is between 3200-3800 CP.

[0046] During use, in the initial state, the blocking block 708 is inserted into the liquid storage bin 706. The pressure of the hydraulic oil on the rubber plug 704 compresses the second compression spring 702, and the cylindrical block 703 contracts into the cylindrical housing 701. When the crane controls this hoisting device and lowers the precast box girder 5 to the preset position, the pulling ropes 10 on the left and right sides of the precast box girder 5 pull the blocking block 708 out of the liquid storage bin 706. Under the action of the second compression spring 702, the rubber plug 704 drives the cylindrical block 703 to extend out of the housing 701. During the movement of the rubber plug 704, the hydraulic oil is squeezed into the liquid storage bin 706 through the liquid passing pipe 705. The hydraulic oil slowly passes through the liquid passing pipe 705 due to its viscosity. Therefore, the cylindrical block 703 slowly extends out of the housing 701. One ends of the two cylindrical blocks 703 far from the precast box girder 5 respectively abut against the side of the adjacent precast box girder 5, so that the longitudinal positioning device 7 limits the precast box girder 5 in a suitable position.

[0047] This embodiment provides a detachable connection method between the cylindrical housing 701 and the precast box girder 5. Specifically, connection ears are provided on the cylindrical housing 701, and the cylindrical housing 701 is detachably connected to the side of the precast box girder 5 through the connection ears and connection bolts.

[0048] The aperture of the liquid passing pipe 705 is less than two millimeters, so that the liquid passing pipe 705 can reduce the flow rate of the hydraulic oil passing through, thereby making the moving speed of the cylindrical block 703 relatively low and avoiding the shaking of the precast box girder 5.

[0049] Such as Figure 9 , 10 , the pile body 14 is fixedly connected to the upper end of the subgrade 13. During hoisting, the two lifting ropes 11 are wound around both sides of the precast box girder 5, and the two longitudinal positioning devices 7 are respectively installed on the left and right sides of the precast box girder 5 through connecting bolts. Then the transverse positioning device 7 is placed on the upper side of the middle part of the precast box girder 5, and the two inserting plates 602 are inserted into the U-shaped frame 601, so that the transverse positioning device 7 is fixed on the upper side of the middle part of the precast box girder 5. The crane hook is connected to the lifting ring 2, and the hoisting work starts.

[0050] The crane lifts the precast box girder 5. Under the action of the first compression spring 604, the rectangular plate 605 moves downward. The downward movement of the rectangular plate 605 drives the backing plate 608 to move to a position lower than the lowest horizontal line of the precast box girder 5. The crane hoists the precast box girder 5 to a certain height above the pile body 14. At this time, the backing plate 608 is lower than the highest horizontal line of the pile body 14, and at the same time the precast box girder 5 is located between the two precast box girders 5 that have been hoisted. The four electric push rods 8 extend, and the electric push rods 8 drive the supporting blocks 9 to rise. During the rising process of the supporting blocks 9, the pulling ropes 10 are pulled; the pulling ropes 10 located on the front and rear sides of the precast box girder 5 pull the T-shaped rods 610 to move, and the T-shaped rods 610 drive the push plates 607 to extend from the strip-shaped grooves through the nylon ropes 609. The two push plates 607 drive the backing plates 608 to move towards both sides of the pile body 14, and the two backing plates 608 contact the two sides of the pile body 14. The precast box girder 5 is limited to the middle line position of the pile body 14 through the transverse positioning device 6; the pulling ropes 10 located on the left and right sides of the precast box girder 5 pull the stoppers 708 away from the liquid storage bin 706. Under the action of the second compression spring 702, the rubber plug 704 drives the cylindrical block 703 to extend from the cylindrical shell 701. During the movement of the rubber plug 704, the hydraulic oil is squeezed into the liquid storage bin 706 through the liquid passing pipe 705. The hydraulic oil slowly passes through the liquid passing pipe 705 due to viscosity. Therefore, the cylindrical block 703 slowly extends from the cylindrical shell 701. The ends of the two cylindrical blocks 703 away from the precast box girder 5 respectively abut against the sides of the adjacent precast box girder 5, so that the longitudinal positioning device 7 limits the precast box girder 5 to a proper position. Control the crane to continue to lower the precast box girder 5 so that the precast box girder 5 is hoisted to the specified position above the pile body 14.

[0051] This device uses the transverse positioning device 6 to position and limit the left and right sides of the precast box girder 5 with respect to the pile body 14, and the longitudinal positioning device 6 to position and limit the distance between the precast box girders 5, reducing the adjustment difficulty for small deviations during the hoisting of the precast box girder 5 and improving the work efficiency.

[0052] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A hoisting device for a prefabricated box girder of a viaduct, comprising a traction rope (1), the upper end of the traction rope (1) being fixedly connected to a lifting ring (2), characterized in that: The lower end of the traction rope (1) is fixedly connected to a support platform (3), a jacking mechanism is arranged on the top surface of the support platform (3), the output end of the jacking mechanism is fixedly connected to a support block (9), and the traction rope (1) is arranged through the support block (9); the front, rear, left and right parts of the support block (9) are all fixedly connected to pull ropes (10), the four pull ropes (10) are arranged through the support platform (3), and a group of suspension ropes (11) are respectively arranged on the left and right sides of the bottom surface of the support platform (3); a transverse positioning device (6) is clamped on the upper end of the middle part of the prefabricated box beam (5), and the left and right sides of the prefabricated box beam (5) are fixedly connected to longitudinal positioning devices (7); Two sets of suspension ropes (11) are wound and connected to the left and right parts of the prefabricated box beam (5); a push plate control mechanism is provided at each of the front and rear ends of the transverse positioning device (6), a push plate (607) is slidably connected to the push plate control mechanism, and the ends of the front and rear two pull ropes (10) are respectively connected to the two push plate control mechanisms; A hydraulic control mechanism is provided on the longitudinal positioning device (7), a columnar block (703) is slidably connected to the hydraulic control mechanism, and ends of the left and right pull ropes (10) are respectively connected to the hydraulic control mechanisms on both sides; When the jacking mechanism is output, the support block (9) drives the pull rope (10) to pull upward, and the front and rear pull ropes (10) drive the push plate (607) to move toward each other through the push plate control mechanism until they are clamped on the front and rear sides of the pile body, and the left and right pull ropes (10) drive the two column blocks (703) to move away from each other through the hydraulic control mechanism, and are clamped on the side edges of the prefabricated box beams (5) on the adjacent two sides; The transverse positioning device (6) comprises a U-shaped frame (601), and a plug plate (602) for supporting the prefabricated box beam (5) is slidably connected to the left and right vertical arms of the U-shaped frame (601), and the plug plate (602) is arranged horizontally; the lower ends of the two vertical arms are provided with a rectangular groove (603), and the rectangular groove (603) opens downward; the push plate control mechanism comprises a rectangular plate (605) slidably connected to the rectangular groove (603), and a first compression spring (604) is also arranged in the rectangular groove (603), the upper end of the first compression spring (604) is connected to the top surface of the rectangular groove (603), and the lower end abuts against the upper end of the rectangular plate (605); the lower end of the rectangular plate (605) is fixedly connected to a rectangular block (606), and the rectangular block (606) is arranged horizontally. The rectangular block (606) is provided with a strip groove and a U-shaped groove, and the strip groove is opened inwardly, one end of the U-shaped groove is connected to the strip groove, and the other end opens outwardly; A push plate (607) is slidably connected to the middle of the strip groove, a nylon rope (609) is arranged in the U-shaped groove, one end of the nylon rope (609) is fixedly connected to the push plate (607), and the other end is fixedly connected to a T-shaped rod (610); the ends of the front and rear pull ropes (10) are respectively connected to the T-shaped rods (610) of the two push plate control mechanisms.

2. The viaduct prefabricated box girder hoisting device according to claim 1 is characterized in that: A connecting rope (12) is provided in the middle of the bottom surface of the support platform (3), and the lower end of the connecting rope (12) is fixedly connected to a rope splitting bracket (4); a plurality of rope splitting points are provided on the rope splitting bracket (4), and pulleys are provided at the rope splitting points; the pull rope (10) passes through the pulleys at the corresponding positions and is connected to the hydraulic control mechanism; and the suspension rope (11) passes through the pulleys at the corresponding positions and is connected to the push plate control mechanism.

3. The viaduct prefabricated box girder hoisting device according to claim 1 is characterized in that: A rectangular protrusion is provided at the upper end of the rectangular plate (605), and a strip-shaped protrusion is provided at the lower end of the push plate (607) on a side away from the pad (608).

4. The viaduct prefabricated box girder hoisting device according to claim 1, characterized in that: A backing plate (608) is fixedly connected to the end of the push plate (607), and the backing plate (608) and the push plate (607) are arranged in a T shape.

5. The viaduct prefabricated box girder hoisting device according to claim 1, characterized in that: The longitudinal positioning device (7) comprises a columnar shell (701) detachably connected to the side of the prefabricated box beam (5); the columnar shell (701) is openly arranged away from the side of the prefabricated box beam (5); a second compression spring (702) is arranged in the columnar shell (701); a columnar block (703) is slidably connected in the columnar shell (701); a rubber plug (704) is fixedly connected to one end of the columnar block (703) close to the second compression spring (702); the columnar block (703) and the rubber plug (704) are both connected to the columnar The cylindrical housing (701) is slidably and sealably connected, and a liquid filling cavity is formed between the cylindrical housing (701), the cylindrical block (703) and the rubber plug (704); the hydraulic control mechanism comprises a liquid passing pipe (705) connected to the liquid filling cavity, the upper end of the liquid passing pipe (705) is fixedly connected to a liquid storage bin (706) connected to the liquid passing pipe (705), the middle part of the liquid storage bin (706) is slidably and sealably connected to a liquid blocking block (707), and one end of the liquid storage bin (706) away from the liquid passing pipe (705) is clamped with a stopper (708); When the stopper (708) is inserted into the liquid storage tank (706), the second compression spring (702) is compressed, and the columnar block (703) is contracted in the columnar housing (701).

6. The viaduct prefabricated box girder hoisting device according to claim 5, characterized in that: The filling cavity is filled with hydraulic oil, and the viscosity of the hydraulic oil is between 3200-3800CP.

7. The viaduct prefabricated box girder hoisting device according to claim 5, characterized in that: The columnar shell (701) is provided with a connection ear, and the columnar shell (701) is detachably connected to the side of the prefabricated box beam (5) via the connection ear.

8. The viaduct prefabricated box girder hoisting device according to claim 5, characterized in that: The aperture of the liquid passage (705) is less than two millimeters.

9. The viaduct prefabricated box girder hoisting device according to claim 5, characterized in that: The liquid blocking block (707) is made of waterproof rubber.

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