A precast box culvert hoist

Abstract

The utility model relates to prefabricated box culvert lifting appliance technical field, especially prefabricated box culvert lifting appliance, including main girder, both ends of main girder are slidably provided with hook leg, both sides of hook leg are hinged with connecting rod, and the one end away from hook leg of connecting rod is connected with lifting hook through hinge shaft, and the hinge shaft is provided with on -off device, and the main girder is provided with the clamping groove with on -off device cooperation, and the inside of hook leg is slidably provided with crossbeam along the vertical direction, be provided with locking mechanism between crossbeam and hook leg, and the both ends of crossbeam are provided with telescopic link along the horizontal direction. Through setting up the hook leg of sliding, the connecting rod of hinging and the lifting hook, cooperate the design of on -off device and clamping groove, can realize the convenient opening and closing and the fixation of lifting hook, need not to pass through prefabricated box culvert with sling, greatly simplify hoisting operation process, the crossbeam of sliding in hook leg and locking mechanism, in combination with telescopic link of crossbeam both ends, can adjust according to the size of prefabricated box culvert, effectively improve the adaptability and stability of hoisting, significantly improve work efficiency, reduce the operation complexity and labour intensity.

Description

Technical Field

[0001] This utility model relates to the field of precast box culvert lifting tools, and in particular to a precast box culvert lifting tool. Background Technology

[0002] Precast box culverts are concrete box-shaped culvert structures that are prefabricated in a factory and then transported to the construction site for installation. A box culvert refers to a culvert whose body is constructed using reinforced concrete box-shaped pipe sections. Box culverts consist of one or more square or rectangular cross-sections, generally made of reinforced concrete or masonry, although reinforced concrete is more widely used. In highway and railway construction, precast box culverts are commonly used to cross obstacles such as roads, rivers, and valleys, providing passage for pedestrians and vehicles while ensuring the smooth flow of water.

[0003] Precast box culvert lifting equipment is specialized equipment used for lifting and transporting precast box culverts. For example, patent CN218809853U discloses a precast box culvert lifting equipment, comprising a lifting frame and a base. The lifting frame has lifting sections at its four corners and sling suspension sections around its perimeter. Corresponding sling through-holes are provided on the base, through which the slings pass and connect to the sling suspension sections of the lifting frame. The lifting section includes a base with a lifting column on its upper part, and lifting holes on the lifting column. The sling suspension sections are connected to the lifting frame by welding.

[0004] In the above scheme, the hoisting slings need to be bypassed around the precast box culvert during hoisting, which is cumbersome and affects work efficiency. Utility Model Content

[0005] To address the problem that current hoisting operations require slings to be routed around precast box culverts, which is cumbersome and reduces work efficiency, this utility model provides a precast box culvert hoisting tool.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A precast box culvert lifting device includes a main beam with hook legs slidably mounted at both ends. Connecting rods are hinged to the front and rear sides of each hook leg. A hook is connected to the end of each connecting rod furthest from the hook leg via a hinge shaft. An opening / closing device is mounted on the hinge shaft. A slot is provided on the main beam to cooperate with the opening / closing device. A crossbeam slides vertically inside each hook leg. A locking mechanism is provided between the crossbeam and the hook leg. Telescopic rods are mounted at both ends of the crossbeam in the horizontal direction. This precast box culvert lifting device, with its sliding hook legs, hinged connecting rods, and hook, combined with the opening / closing device and slot design, allows for convenient opening, closing, and fixing of the hook, eliminating the need to wrap the sling around the precast box culvert and significantly simplifying the lifting operation. The sliding crossbeam and locking mechanism inside the hook legs, combined with the telescopic rods at both ends of the crossbeam, can be flexibly adjusted according to the size of the precast box culvert, effectively improving the adaptability and stability of the lifting operation, significantly increasing work efficiency, and reducing operational complexity and labor intensity.

[0008] Preferably, the hook leg includes two spaced-apart side plates; each side plate has a through hole at its corner; a roller is rotatably mounted within the through hole; a sleeve is fixedly mounted on one side of the bottom surface of the side plate; and a crossbeam is slidably mounted within the sleeve. The hook leg's design with two spaced-apart side plates, combined with the rotatable roller within the through hole at the corner of the side plate, effectively reduces friction with the precast box culvert or other components during lifting, reducing wear and extending the service life of the precast box culvert lifting equipment. It also allows for smoother and more flexible movement of the precast box culvert lifting equipment. Furthermore, the sleeve fixed on one side of the bottom surface of the side plate, in conjunction with the slidably mounted crossbeam, not only facilitates height adjustment of the crossbeam according to actual needs but also enhances the stability and support of the crossbeam during lifting, enabling the lifting equipment to adapt to different working conditions for lifting precast box culverts and improving the overall safety and reliability of the operation.

[0009] Preferably, the crossbeam includes a vertical rod; the vertical rod is slidably disposed within a sleeve; the locking mechanism includes a through hole two fixedly disposed on the sleeve, a through hole five fixedly disposed on the vertical rod, and a screw rod one; the screw rod one uses through holes two and five to fix the vertical rod within the sleeve. This design of the crossbeam and locking mechanism, through the sliding engagement of the vertical rod within the sleeve, allows for flexible adjustment of the crossbeam height according to the specific dimensions of the precast box culvert and hoisting requirements, meeting diverse hoisting conditions; while the locking mechanism composed of through holes two, five, and screw rod one can firmly fix the vertical rod within the sleeve after the crossbeam is adjusted to the correct position, ensuring that the crossbeam will not shift during hoisting, effectively enhancing the stability and reliability of the overall structure of the lifting device, and ensuring the safe operation of the precast box culvert hoisting.

[0010] Preferably, the telescopic rod includes a sleeve two and a screw two; the sleeve two is fixedly mounted on opposite sides of the vertical rod; a sliding rod is slidably mounted inside the sleeve two; a through hole three is provided on the sleeve two; a through hole four is provided on the sliding rod to match the through hole three; the screw two uses the through holes three and four to fix the sliding rod to the sleeve two. This telescopic rod design, through the sliding engagement of the sleeve two and the sliding rod, allows the extension length of the telescopic rod to be adjusted according to the width of the precast box culvert, thus adapting to the lifting needs of box culverts of different specifications; the corresponding through holes three and four on the sleeve two and the sliding rod, combined with the tightening of the screw two, can firmly lock the sliding rod after adjustment, ensuring that the telescopic rod will not shift during lifting, effectively enhancing the stability and reliability of the connection between the lifting device and the precast box culvert, and improving the safety and efficiency of the lifting operation.

[0011] Preferably, the extension direction of the second sleeve is perpendicular to the length direction of the crossbeam. This design allows the telescopic rod to extend and retract in a direction perpendicular to the crossbeam, precisely fitting the side of the precast box culvert. This significantly enhances the contact stability and gripping force between the lifting device and the box culvert. This layout overcomes the limitations of traditional lifting devices in horizontal adjustment, effectively addressing the stress requirements of precast box culverts of different specifications during lifting. It avoids problems such as box culvert swaying or falling due to insufficient contact area or uneven stress during lifting, significantly improving the applicability and operational safety of the lifting device.

[0012] Preferably, a support plate is fixedly installed at the bottom of the inner side of the outer wall of sleeve two. The support plate fixedly installed at the bottom of the inner side of the outer wall of sleeve two can support the weight of the precast box culvert when hoisting it, thereby improving the stability and service life of the precast box culvert hoisting equipment structure and ensuring that the hoisting operation is carried out safely and reliably.

[0013] Preferably, a baffle plate is fixedly installed at the end of the slide rod away from the sleeve plate; a support plate is fixedly installed on the bottom surface of the slide rod end. The baffle plate fixedly installed at the end of the slide rod away from the sleeve plate can effectively block the lateral displacement that may occur during the hoisting of the precast box culvert, ensuring that the box culvert is always in a stable hoisting state and preventing safety accidents caused by the sliding of the box culvert; while the support plate fixedly installed on the bottom surface of the slide rod end can provide support for the precast box culvert, increase the contact area with the box culvert, evenly distribute the pressure during hoisting, avoid excessive local stress on the box culvert and damage, and also enhance the overall stability and reliability of the lifting equipment, making the hoisting operation safer and more efficient.

[0014] Preferably, baffles are fixedly installed at both ends of the main beam. These baffles effectively limit the sliding range of the hook legs on the main beam, preventing them from detaching from the main beam due to excessive sliding during hoisting, thus ensuring the integrity and stability of the lifting device structure. Simultaneously, the baffles act as a buffer when the hook legs slide to their limit position, reducing the impact of collisions between the hook legs and the ends of the main beam, minimizing component wear, extending the service life of the lifting device, and providing a reliable guarantee for the safe and orderly operation of precast box culvert hoisting.

[0015] Preferably, hinged rods are hinged to both sides of the center of the bottom surface of the main beam; the end of the hinged rod furthest from the main beam is hinged to the middle of the connecting rod. The hinged rods on both sides of the center of the bottom surface of the main beam connect one end to the main beam and the other end to the middle of the connecting rod, forming a stable triangular support structure. During the hoisting of the precast box culvert, this structure effectively distributes the force during hoisting, enhances the overall stability of the lifting equipment, and avoids deformation or damage to the lifting equipment due to uneven force distribution. Simultaneously, the hinged design allows the lifting equipment to flexibly adapt to changes in the posture of the precast box culvert during hoisting, ensuring that the hook always maintains a reasonable stress state, improving the safety and reliability of hoisting, and reducing safety hazards caused by structural problems with the lifting equipment.

[0016] Preferably, two support rods are fixedly installed on the bottom surface of the middle section of the main beam; sleeves are fixedly installed on the bottom surface of both ends of the support rods; springs are fixedly installed on the bottom surface of the inner sleeves; and an abutment block is fixedly connected to the end of the spring away from the inner bottom surface of the sleeve. The support rods, sleeves, springs, and abutment block structure installed on the bottom surface of the middle section of the main beam can effectively buffer the impact force during the hoisting process through the elastic deformation of the springs, avoiding damage to the lifting equipment due to excessive instantaneous force, while reducing the vibration of the precast box culvert during lifting and lowering, and protecting the structural integrity of the box culvert; the abutment block can tightly fit the hoisted object under the action of the spring, adaptively adjusting the contact state, enhancing the stability of the lifting equipment, and ensuring the safe and stable hoisting operation.

[0017] Before hoisting, the engagement of the opening and closing device with the slot keeps the hook leg fixed, facilitating the stable descent and positioning of the precast box culvert lifting equipment and ensuring safe and accurate arrival above the box culvert. When the abutment block collides with the box culvert, it triggers the opening and closing device to unlock, changing it from a closed to an open state. In conjunction with the hoisting action, using mechanical principles, the hook leg slides along the main beam to embrace the box culvert. The entire process requires no manual adjustment of the hook leg position, simplifying the operation process, improving hoisting efficiency, reducing the risk of human error, and effectively ensuring the safety and stability of the hoisting process.

[0018] As can be seen from the above technical solutions, the advantages of this utility model include: the precast box culvert lifting device, by setting sliding hook legs, hinged connecting rods and hooks, combined with the design of opening and closing devices and slots, can realize convenient opening and closing and fixing of hooks, without having to wrap the lifting straps around the precast box culvert, greatly simplifying the lifting operation process; the sliding crossbeam and locking mechanism inside the hook legs, combined with the telescopic rods at both ends of the crossbeam, can be flexibly adjusted according to the size of the precast box culvert, effectively improving the adaptability and stability of lifting, significantly improving work efficiency, and reducing operational complexity and labor intensity. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the hook leg structure after the roller is removed.

[0024] Explanation of reference numerals in the attached drawings: 1-Main beam, 2-Hook leg, 3-Connecting rod, 4-Hinge shaft, 5-Hook, 6-Opener / closer, 7-Slot, 8-Crossbeam, 9-Telescopic rod, 10-Hinged rod, 11-Support rod, 12-Sleeve three, 13-Abutting block, 14-Screw one;

[0025] 101-Baffle 1; 201-Side plate; 202-Through hole 1; 203-Roller; 204-Sleeve 1; 205-Through hole 2; 801-Vertical rod; 802-Through hole 5; 901-Sleeve 2; 902-Slide rod; 903-Through hole 3; 904-Through hole 4; 905-Screw 2; 906-Support plate 1; 907-Baffle 2; 908-Support plate 2. Detailed Implementation

[0026] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, a precast box culvert lifting device includes a main beam 1, with hook legs 2 slidably mounted at both ends of the main beam 1. Connecting rods 3 are hinged to both the front and rear sides of the hook legs 2. A hook 5 is connected to the end of the connecting rod 3 away from the hook legs 2 through a hinge shaft 4. An opening and closing device 6 is mounted on the hinge shaft 4. A slot 7 is mounted on the main beam 1 to cooperate with the opening and closing device 6. A crossbeam 8 is slidably mounted in the hook legs 2 along the vertical direction. A locking mechanism is provided between the crossbeam 8 and the hook legs 2. Telescopic rods 9 are mounted at both ends of the crossbeam 8 along the horizontal direction.

[0028] This precast box culvert lifting device, with its sliding hook leg 2, hinged connecting rod 3, and hook 5, along with the design of the opening and closing device 6 and the slot 7, enables convenient opening, closing, and fixing of the hook 5 without having to wrap the sling around the precast box culvert, greatly simplifying the lifting operation process. The hook leg 2 is equipped with a sliding crossbeam 8 and a locking mechanism, which, together with the telescopic rods 9 at both ends of the crossbeam 8, can be flexibly adjusted according to the size of the precast box culvert, effectively improving the adaptability and stability of the lifting operation, significantly increasing work efficiency, and reducing operational complexity and labor intensity.

[0029] The main beam 1 has baffles 101 fixedly installed at both ends. Hinged rods 10 are hinged to both sides of the middle of the bottom surface of the main beam 1; the end of each hinged rod 10 away from the main beam 1 is hinged to the middle of the connecting rod 3. Two support rods 11 are fixedly installed on the bottom surface of the middle of the main beam 1; sleeves 12 are fixedly installed on the bottom surface of both ends of the support rods 11; springs are fixedly installed on the bottom surface of the inner side of the sleeves 12; and an abutment block 13 is fixedly connected to the end of the spring away from the inner bottom surface of the sleeves 12.

[0030] The precast box culvert lifting device, through baffles 101 fixed at both ends of the main beam 1, effectively limits the sliding range of the hook leg 2 on the main beam 1, preventing the hook leg 2 from detaching from the main beam 1 due to excessive sliding during lifting, thus ensuring the integrity and stability of the lifting device structure. Simultaneously, baffles 101 act as a buffer when the hook leg 2 slides to its limit position, reducing the impact of collision between the hook leg 2 and the end of the main beam 1, reducing component wear, extending the service life of the lifting device, and providing a reliable guarantee for the safe and orderly operation of precast box culvert lifting. Hinged rods 10, hinged on both sides of the middle of the bottom surface of the main beam 1, connect one end to the main beam 1 and the other end to the middle of the connecting rod 3, forming a stable triangular support structure. When hoisting precast box culverts, this structure effectively distributes the force during the hoisting process, enhances the overall stability of the lifting equipment, and avoids deformation or damage to the lifting equipment due to uneven force distribution. Simultaneously, the hinged design allows the lifting equipment to flexibly adapt to changes in the posture of the precast box culvert during hoisting, ensuring that the hook 5 always maintains a reasonable stress state, improving the safety and reliability of hoisting, and reducing safety hazards caused by structural problems with the lifting equipment. The support rod 11, sleeve 3 12, spring, and abutment block 13 structure installed on the bottom surface of the middle section of the main beam 1 can effectively buffer the impact force during hoisting of the precast box culvert through the elastic deformation of the spring, preventing damage to the lifting equipment due to excessive instantaneous force, while also reducing vibration of the precast box culvert during lifting and lowering, protecting the structural integrity of the box culvert. The abutment block 13 can tightly adhere to the hoisted object under the action of the spring, adaptively adjusting the contact state, enhancing the stability of the lifting equipment, and ensuring safe and stable hoisting operations. Before hoisting, the cooperation between the opening / closing device 6 and the slot 7 keeps the hook leg 2 fixed, facilitating the stable descent and positioning of the precast box culvert lifting equipment and ensuring safe and accurate arrival above the box culvert. When the abutment block 13 collides with the box culvert, it triggers the opening / closing device 6 to unlock, changing it from a closed to an open state. In conjunction with the hoisting action, using mechanical principles, the hook leg 2 slides along the main beam 1 to embrace the box culvert. The entire process does not require manual adjustment of the hook leg 2 position, which simplifies the operation process, improves hoisting efficiency, reduces the risk of human error, and effectively ensures the safety and stability of the hoisting process.

[0031] like Figure 4As shown, the hook leg 2 includes two spaced-apart side plates 201; each side plate 201 has a through hole 202 at its corner; a roller 203 is rotatably mounted inside the through hole 202; a sleeve 204 is fixedly mounted on one side of the bottom surface of the side plate 201; and a crossbeam 8 is slidably mounted inside the sleeve 204. The hook leg 2's design with two spaced-apart side plates 201, combined with the rotatable roller 203 inside the through hole 202 at the corner of the side plate 201, effectively reduces friction with precast box culverts or other components during lifting, reducing wear and extending the service life of the precast box culvert lifting equipment. It also allows for smoother and more flexible movement of the precast box culvert lifting equipment. Furthermore, the sleeve 204 fixed on one side of the bottom surface of the side plate 201, in conjunction with the slidably mounted crossbeam 8, not only facilitates height adjustment of the crossbeam 8 according to actual needs but also enhances the stability and support of the crossbeam 8 during lifting, enabling the lifting equipment to adapt to different working conditions for lifting precast box culverts and improving the overall safety and reliability of the operation.

[0032] In the above configuration, the crossbeam 8 includes a vertical rod 801; the vertical rod 801 is slidably disposed within the sleeve 204; the locking mechanism includes a through hole 205 fixedly disposed on the sleeve 204, a through hole 802 fixedly disposed on the vertical rod 801, and a screw 14; the screw 14 uses the through hole 205 and the through hole 802 to fix the vertical rod 801 within the sleeve 204. The telescopic rod 9 includes a sleeve 901 and a screw 905; the sleeve 901 is fixedly disposed on opposite sides of the vertical rod 801; a sliding rod 902 is slidably disposed within the sleeve 901; a through hole 903 is provided on the sleeve 901; a through hole 904 is provided on the sliding rod 902 in conjunction with the through hole 903; the screw 905 uses the through holes 903 and 904 to fix the sliding rod 902 onto the sleeve 901. The extension direction of sleeve 2 901 is perpendicular to the length direction of crossbeam 8. A support plate 1 906 is fixedly installed on the bottom of the inner side of the outer wall of sleeve 2 901. A baffle 2 907 is fixedly installed at the end of slide rod 902 away from sleeve 2 901; a support plate 2 908 is fixedly installed on the bottom surface of the end of slide rod 902.

[0033] The design of this crossbeam 8 and locking mechanism, through the sliding engagement of the vertical rod 801 within the sleeve 204, allows for flexible adjustment of the height of the crossbeam 8 according to the specific dimensions of the precast box culvert and hoisting requirements, meeting diverse hoisting conditions. The locking mechanism, composed of through hole 205, through hole 802, and screw 14, can firmly fix the vertical rod 801 within the sleeve 204 after the crossbeam 8 is adjusted to the correct position, ensuring that the crossbeam 8 will not shift during hoisting. This effectively enhances the stability and reliability of the overall structure of the lifting device and guarantees the safe operation of the precast box culvert hoisting. The telescopic rod 9 is designed with a sliding engagement between sleeve 2 901 and slide rod 902, allowing the extension length of the telescopic rod 9 to be adjusted according to the width of the precast box culvert, thus adapting to the hoisting requirements of box culverts of different specifications. The through holes 3 903 and 4 904 correspondingly provided on sleeve 2 901 and slide rod 902, together with the fastening of screw 2 905, can firmly lock slide rod 902 after adjustment, ensuring that the telescopic rod 9 will not shift during hoisting, effectively enhancing the stability and reliability of the connection between the lifting device and the precast box culvert, and improving the safety and efficiency of hoisting operations. The design of sleeve 2 901 extending perpendicular to the length of the crossbeam 8 allows the telescopic rod 9 to extend and retract in a direction perpendicular to the crossbeam 8, precisely fitting the side of the precast box culvert. This significantly enhances the contact stability and gripping strength between the lifting device and the box culvert. This layout overcomes the limitations of traditional lifting devices in horizontal adjustment, effectively addressing the stress requirements of precast box culverts of different specifications during lifting. It avoids problems such as box culvert swaying or falling due to insufficient contact area or uneven stress during lifting, significantly improving the applicability and operational safety of the lifting device. The support plate 1 906, fixedly installed at the bottom of the inner side of the outer wall of sleeve 2 901, supports the weight of the precast box culvert during lifting, improving the stability and service life of the lifting device structure and ensuring safe and reliable lifting operations. The baffle 907 fixedly installed at the end of the slide bar 902 away from the sleeve 901 can effectively block the lateral displacement that may occur during the hoisting of the precast box culvert, ensuring that the box culvert is always in a stable hoisting state and preventing safety accidents caused by the sliding of the box culvert. The support plate 908 fixedly installed on the bottom surface of the end of the slide bar 902 can provide support for the precast box culvert, increase the contact area with the box culvert, evenly distribute the pressure during hoisting, avoid excessive local stress on the box culvert and damage, and also enhance the overall stability and reliability of the lifting equipment, making the hoisting operation safer and more efficient.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A precast box culvert lifting device, comprising a main beam (1), hook legs (2) slidably disposed at both ends of the main beam (1), connecting rods (3) hinged to both the front and rear sides of the hook legs (2), a hook (5) connected to the end of the connecting rod (3) away from the hook legs (2) via a hinge shaft (4), an opening and closing device (6) disposed on the hinge shaft (4), and a slot (7) disposed on the main beam (1) in cooperation with the opening and closing device (6), characterized in that, A crossbeam (8) is slidably installed inside the hook leg (2) along the vertical direction; a locking mechanism is provided between the crossbeam (8) and the hook leg (2); and telescopic rods (9) are provided at both ends of the crossbeam (8) along the horizontal direction.

2. The precast box culvert lifting tool according to claim 1, characterized in that, The hook leg (2) includes two spaced side plates (201); each side plate (201) has a through hole (202) at its corner; a roller (203) is rotatably installed in the through hole (202); a sleeve (204) is fixedly installed on one side of the bottom surface of the side plate (201); a crossbeam (8) is slidably installed in the sleeve (204).

3. The precast box culvert lifting tool according to claim 2, characterized in that, The crossbeam (8) includes a vertical rod (801); the vertical rod (801) is slidably disposed in the sleeve (204); the locking mechanism includes a through hole (205) fixedly disposed on the sleeve (204), a through hole (802) fixedly disposed on the vertical rod (801) and a screw (14); the screw (14) uses the through hole (205) and the through hole (802) to fix the vertical rod (801) in the sleeve (204).

4. The precast box culvert lifting tool according to claim 3, characterized in that, The telescopic rod (9) includes a sleeve two (901) and a screw two (905); the sleeve two (901) is fixedly installed on the opposite two sides of the vertical rod (801); a slide rod (902) is slidably installed inside the sleeve two (901); a through hole three (903) is provided on the sleeve two (901); a through hole four (904) is provided on the slide rod (902) in conjunction with the through hole three (903); the screw two (905) uses the through hole three (903) and the through hole four (904) to fix the slide rod (902) on the sleeve two (901).

5. The precast box culvert lifting tool according to claim 4, characterized in that, The extension direction of sleeve 2 (901) is perpendicular to the length direction of crossbeam (8).

6. The precast box culvert lifting tool according to claim 5, characterized in that, A support plate (906) is fixedly installed at the bottom of the inner side of the outer wall of sleeve 2 (901).

7. The precast box culvert lifting tool according to claim 5, characterized in that, A baffle plate (907) is fixedly installed at the end of the slide rod (902) away from the sleeve (901); a support plate (908) is fixedly installed on the bottom surface of the end of the slide rod (902).

8. The precast box culvert lifting tool according to claim 1, characterized in that, The two ends of the main beam (1) are fixedly equipped with baffles (101).

9. The precast box culvert lifting tool according to claim 1, characterized in that, The bottom of the main beam (1) is hinged on both sides of the middle part of the bottom surface with hinge rods (10); the end of the hinge rod (10) away from the main beam (1) is hinged to the middle of the connecting rod (3).

10. The precast box culvert lifting tool according to claim 1, characterized in that, Two support rods (11) are fixedly installed on the bottom surface of the middle part of the main beam (1); sleeves (12) are fixedly installed on the bottom surface of both ends of the support rods (11); springs are fixedly installed on the bottom surface of the inner side of the sleeves (12); and an abutment block (13) is fixedly connected to one end of the spring away from the bottom surface of the inner side of the sleeves (12).

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