A suspension hanger for large-angle hoisting construction of concrete box beam and its use method

Abstract

The present invention discloses a suspension sling for large-angle hoisting construction of concrete box girders and a method for using the suspension sling, the suspension sling comprises a crossbeam, each of which is provided with a lifting ear at both ends in the length direction; a threaded steel bar, which is horizontally fixed above the main beam of the box girder and is threadedly connected to the crossbeam, and the threaded steel bar vertically penetrates the crossbeam; a pair of push blocks, which are respectively arranged on both sides of the width direction of the main beam; wherein a groove for accommodating the push block is arranged on the side of the lifting ear opposite to the push block, and during the hoisting process, the push block is placed in the groove so that the push block and the lifting ear are linked. The lifting ear position of the suspension sling provided by the present invention is adjustable, and can be used for hoisting concrete box girders with large deflection angles, and the spacing between a pair of lifting ears is adjustable, and can be applied to box girders of different sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of box girder hoisting, and in particular to a suspension hanger for large-angle hoisting construction of a concrete box girder and a use method thereof. Background Art

[0002] During the construction of bridges, when the concrete box girder is hoisted at a large deflection angle, due to the deviation between the central axis of the main truss of the bridge erector and the central axis of the bridge, the lifting point of the suspension device will change continuously according to the design position of the concrete box girder when the concrete box girder is suspended. In conventional hoists, the position of the hanger is generally adjusted by enlarging the lifting holes to adjust the installation position of the concrete box girder, or directly by hinged hangers. However, in conventional construction, these two methods have shortcomings such as potential safety hazards caused by structural stress and limited adjustment of the deflection angle of the concrete box girder.

[0003] At the same time, when hoisting prefabricated concrete box girders, mobile cranes, gantry cranes or bridge cranes are generally used. It is necessary to set up lifting points on the prefabricated box girders. When hoisting large-tonnage prefabricated box girders, it is necessary to reserve a number of lifting holes on the top plate of the box girder as lifting points, and then use lifting rods with nuts at both ends for hoisting. Due to the limitation of the bearing capacity of concrete at the lifting hole position, the larger the tonnage of the prefabricated box girder, the more lifting holes are set. With the great improvement of bridge design methods and the research and development capabilities of bridge construction equipment, the span and weight of prefabricated box girders are constantly increasing, and the more lifting holes are required and reserved for each section. Such a large number of lifting holes will greatly weaken the bearing capacity of the box girder at the lifting point, and it cannot guarantee that the tension of each tie rod is uniform, so that the concrete box girder will be deflected during the hoisting process, thus affecting the hoisting safety. For example, construction in some special terrain and geological environments will also face special problems. For example, the planned Suwan Bridge and connecting line project will be built in the Chengdong area of ​​Guigang City, Guangxi. The bridge site is located in an area frequently affected by typhoons. The main tower is about 3m away from the navigable channel of Yujiang River and is close to 220KVA high-voltage transmission lines and residential buildings. The construction is difficult, the concrete measuring box is prone to tilt, and the safety risk is high. Due to the large span of the main beam, when controlling the concrete measuring box, it is necessary to always pay attention to the direction and avoid concentrated force on the box beam, and to ensure stability during the entire lifting process.

[0004] After searching the existing technical literature, it was found that the Chinese invention patent publication number CN107161850A discloses a quick lifting sling for prefabricated concrete box girders. The lifting sling includes a horizontal beam, a vertical beam, a connecting block arranged at the lower end of the vertical beam, and an extrusion plate placed on one side of the connecting block. The box girder is lifted by the extrusion effect of the extrusion plate on the box girder. During the lifting process, the extrusion plate is prone to sliding, so positioning pins are required to position the horizontal beam and the box girder. The operation is complicated. At the same time, positioning holes need to be opened on the box girder, which will damage the structure of the box girder.

[0005] China Utility Model Patent Publication No. CN204772868U discloses a special hoist for hoisting large-tonnage prefabricated box girders. By using a double-hanging hoist and a single-point hoist together, three-point static lifting of the prefabricated box girder as a whole is achieved. In this scheme, hoisting holes need to be opened on the box girder. When the tonnage of the prefabricated box girder increases, the number of hoists needs to be increased. Correspondingly, the number of hoisting holes that need to be opened on the box girder also increases, and the bearing capacity of the box girder at the lifting point will be greatly reduced. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a suspension hanger for large-angle hoisting construction of concrete box girders. The position of the lifting ears of the box girder hanger is adjustable to adjust the angular position of the box girder; the distance between a pair of lifting ears is adjustable to be suitable for box girders of different sizes; and the box girder is hoisted by the cooperation of the lifting ears and push blocks, and the force on the box girder is dispersed and uniform, so that the box girder can remain stable during the hoisting process, thereby ensuring the safety of the hoisting.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] On the one hand, the present invention discloses a suspension hanger for large-angle hoisting construction of a concrete box girder, comprising:

[0009] The crossbeam has a lifting lug at each end in the length direction;

[0010] A threaded steel bar is horizontally fixed above the main beam of the box girder and is threadedly connected to the cross beam, and the threaded steel bar vertically penetrates the cross beam;

[0011] A pair of push blocks, which are respectively arranged on both sides of the main beam in the width direction;

[0012] A groove for accommodating the push block is provided on a side of the lifting ear opposite to the push block. During the lifting process, the push block is placed in the groove so that the push block is linked with the lifting ear.

[0013] Preferably, a pair of fixing ears for supporting the threaded steel bar is provided at the upper end of the box girder main beam, the pair of fixing ears are respectively provided at both ends of the threaded steel bar, and a fixing nut is respectively provided adjacent to the fixing ears, and the fixing nut is sleeved on the threaded steel bar.

[0014] Preferably, the push block comprises:

[0015] A plurality of connecting ears are fixed at even intervals on both sides of the main beam in the width direction, the connecting ears are narrow at the top and wide at the bottom, and each of the connecting ears is provided with an arc-shaped protrusion;

[0016] A connecting plate, which is movably connected to the plurality of connecting ears, and the upper ends of the plurality of connecting plates are provided with through grooves matching the connecting ears;

[0017] A chute plate, which is arranged parallel to the connecting plate and spaced apart, and a plurality of sawtooth grooves arranged at even intervals are formed at the lower end of the chute plate;

[0018] A plurality of reinforcing ribs are disposed between the slide plate and the connecting plate, wherein the plurality of reinforcing ribs include a plurality of longitudinal ribs and a plurality of oblique ribs, wherein the plurality of longitudinal ribs are vertically fixed between the slide plate and the connecting plate, and the oblique ribs are obliquely fixed between two adjacent longitudinal ribs to divide the area between the two adjacent longitudinal ribs into two triangular areas.

[0019] Preferably, a convex block matching the serrated groove is provided on a side of the lifting ear opposite to the slide plate, and during the lifting process, the convex block is placed in the corresponding serrated groove.

[0020] Preferably, a plurality of universal rollers are provided at the lower end of the slide plate.

[0021] Preferably, the crossbeam is a hollow structure, and a driving mechanism for driving the lifting lug to move is arranged inside the crossbeam.

[0022] Preferably, the driving mechanism comprises:

[0023] A bidirectional screw rod, wherein two thread grooves with the same pitch and opposite rotation directions are respectively arranged on both sides of the bidirectional screw rod, and the thread grooves on both sides of the bidirectional screw rod are symmetrical to each other, and the length of the thread groove is the maximum distance that the lifting ear can move;

[0024] A pair of first nuts, which are movably disposed on the thread grooves on both sides of the bidirectional screw rod;

[0025] A plurality of support seats, which are fixed in the cross beam and used to support the bidirectional screw rod;

[0026] The lifting ear is fixed at the lower end of the first nut. When the bidirectional screw rotates, the first nut drives the corresponding lifting ear to move, so that the lifting ears at both ends of the beam move toward or away from each other.

[0027] Preferably, a second nut is provided in the middle of the bidirectional screw rod, a through hole is opened in the second nut, a rolling bearing is arranged in the through hole, and the bidirectional screw rod is inserted in the rolling bearing.

[0028] Preferably, a threaded hole matching the threaded steel bar is formed on the second nut, and the threaded steel bar passes through the threaded hole to be threadedly connected to the second nut.

[0029] On the other hand, according to the above-mentioned suspension hanger for large-angle hoisting construction of concrete box beams, the method of using the suspension hanger comprises the following steps:

[0030] Step 1, weld the connecting ears of the push block to both sides of the main beam of the box beam, insert the connecting ears into the through grooves of the connecting plate, and push the connecting plate until the side of the connecting plate is flush with the side of the connecting ears;

[0031] Step 2, loosen the fixing nut, and control the rotation of the threaded steel bar to adjust the position of the lifting lug;

[0032] Step 3, control the bidirectional screw to rotate so that the ears on both sides of the beam move toward each other until the protrusions on the ears are completely inserted into the serrated grooves at the lower end of the slide plate;

[0033] Step 4: Lift the cross beam and lift the box beam off the ground.

[0034] The beneficial effects of the present invention are:

[0035] 1) The suspension sling disclosed in the present invention fixes the push block on the main beam of the box beam. During the lifting process, the box beam is lifted by the cooperation of the lifting ear and the push block without opening a lifting hole on the box beam, thereby not damaging the structure of the box beam and ensuring the bearing capacity of the box beam. At the same time, the push block evenly distributes the force on the main beam of the box beam, avoiding concentrated force on the box beam, and can keep the box beam stable during the lifting process, ensuring lifting safety.

[0036] 2) The push block of the suspension hanger disclosed in the present invention is provided with a roller at the lower end, which is convenient for movement; and the push block can be fixed by fixing the connecting ear of the push block on the main beam and then connecting the rest of the push block to the connecting ear. The installation method of the push block is simple and convenient, and the push block can be applied to different box beams and can be reused, which saves costs.

[0037] 3) The lifting ears of the suspension sling disclosed in the present invention can be driven by a driving mechanism, which includes a bidirectional screw and a pair of first nuts. The first nuts are fixedly connected to the lifting ears. Two thread grooves with the same pitch and opposite rotation directions are arranged on both sides of the bidirectional screw. The rotation of the bidirectional screw drives the pair of first nuts arranged on the thread grooves to move toward or away from each other, thereby driving the corresponding lifting ears to move synchronously, and the distance between the pair of lifting ears changes accordingly. The spacing between the lifting ears is adjustable, so that the sling is suitable for lifting box girders of different sizes, and has a wide range of applications.

[0038] 4) The threaded steel bar and the cross beam of the suspension hanger disclosed in the present invention are threadedly connected. When the threaded steel bar rotates, the position of the cross beam changes, and the positions of the lifting ears set at both ends of the cross beam change accordingly. The positions of the lifting ears can be adjusted according to the changes in the installation position of the box beam, so that the angular position of the box beam can be adjusted at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of a hoisting device provided in Example 1 of the present disclosure;

[0041] Figure 2 A schematic diagram of the connection relationship between a hoisting device and a main beam provided in Example 1 of the present disclosure;

[0042] Figure 3 A three-dimensional diagram of a lifting device provided in Example 1 of the present disclosure;

[0043] Figure 4-5 A schematic diagram of the connection relationship between a hoisting device and a main beam provided in Example 2 of the present disclosure;

[0044] Figure 6 A structural schematic diagram of a hoisting device provided in Example 2 of the present disclosure;

[0045] Figure 7 A schematic structural diagram of a bidirectional screw rod of a hoisting device provided in Example 2 of the present disclosure;

[0046] Figure 8-9 A schematic diagram of the connection relationship between a push block and a main beam of a hoisting device provided in Example 2 of the present disclosure;

[0047] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure of the A area in the middle;

[0048] Figure 11-12 A schematic diagram of the structure of a part of the push block of a hoisting device provided in Example 2 of the present disclosure;

[0049] Among them, the figure numbers are as follows: 1. lifting device; 2. main beam; 3. lifting mechanism; 4. cross beam; 5. lifting ear; 6. nut; 7. threaded steel bar; 8. fixing ear; 9. fixing nut; 10. reinforcing rib; 101. longitudinal rib; 102. oblique rib; 200. push block; 11. slide plate; 12. first nut; 13. second nut; 14. bidirectional screw; 141. threaded groove; 15. motor; 16. support seat; 17. protrusion; 18. connecting plate; 19. through groove; 20. serrated groove; 21. universal roller; 22. connecting ear; 23. arc-shaped protrusion. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings, and the aforementioned and other purposes, features, aspects and advantages of the present invention will become more obvious, so that those skilled in the art can implement it with reference to the text of the specification. In the accompanying drawings, for the sake of clarity, the shapes and sizes can be enlarged, and the same reference numerals will be used in all figures to indicate the same or similar parts. In the following description, words such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are based on the orientation or position relationship shown in the accompanying drawings. In particular, "height" is equivalent to the size from top to bottom, "width" is equivalent to the size from left to right, and "depth" is equivalent to the size from front to back. These relative terms are for the convenience of explanation and are generally not intended to require specific orientation. Terms related to attachment, connection, etc. (for example, "connection" and "attachment") refer to the relationship between these structures directly or indirectly fixed or attached to each other through intermediate structures, and movable or rigid attachment or relationship, unless otherwise explicitly stated.

[0051] Example 1

[0052] This embodiment introduces a suspension hanger for large-angle hoisting construction of concrete box beams. Figure 1-3 shown.

[0053] The present invention provides a box beam suspension hanger, which is used for hoisting a box beam, and comprises a pair of hoisting devices 1 arranged at both ends of a main beam 2 of the box beam in a longitudinal direction, wherein the hoisting device 1 comprises: a cross beam 4, which is hoisted horizontally just below a hoisting mechanism 3, and whose length direction is perpendicular to the longitudinal direction of the main beam 2 of the box beam;

[0054] A pair of lifting ears 5 are relatively fixed at both ends of the length direction of the lower end face of the cross beam 4; the opposite sides of the pair of lifting ears 5 are sunken to form grooves; a slide plate 11 is horizontally welded on both sides of the transverse direction of the box beam main beam 2, and the slide plate 11 is slidable and does not fall off and is arranged in the groove; the fine-rolled threaded steel bar 7 is horizontally fixed on the upper end face of the box beam main beam 2, and the two ends of the fine-rolled threaded steel bar 7 vertically pass through the cross beam 4; a pair of nuts 6 are screwed and fixed to the fine-rolled threaded steel bar 7, and the pair of nuts 6 are adjacent to the cross beam 4 and are respectively located on both sides of the cross beam 4.

[0055] Furthermore, the lifting device 1 also includes a pair of fixing ears 8 and a pair of fixing nuts 9; the fixing nuts 9 correspond to the fixing ears 8 one by one; the fixing ears 8 are relatively arranged at both ends of the fine-rolled threaded steel bars 7, and the two ends of the fine-rolled threaded steel bars 7 pass through a pair of fixing ears 8.

[0056] A pair of fixing nuts 9 are respectively screwed and fixed on both ends of the fine-rolled threaded steel bar 7, and are adjacent to the corresponding fixing ears 8, so that the fine-rolled threaded steel bar 7 is fixed between the pair of fixing ears 8. The present invention uses the fixing ears 8 and the fixing nuts 9 to fix the fine-rolled threaded steel bar 7 on the main beam 2 of the box beam.

[0057] Furthermore, the hoisting device 1 further comprises a plurality of reinforcing ribs 10, one end face of the reinforcing rib 10 is welded to the main beam 2 of the box beam, and the other end face of the reinforcing rib 10 is welded to the chute plate 11. The reinforcing rib 10 strengthens the connection between the box beam and the chute plate 11, making the present invention more stable.

[0058] Furthermore, the hoisting device 1 further comprises a pair of turnbuckle bolts; one end of one turnbuckle bolt is fixed to one end of the finely rolled threaded steel bar 7, and the other end thereof is fixed to the crossbeam 4; one end of the other turnbuckle bolt is fixed to the other end of the finely rolled threaded steel bar 7, and the other end thereof is fixed to the crossbeam 4. The turnbuckle bolts strengthen the connection between the crossbeam 4 and the main beam 2 of the box beam, making the present invention more stable.

[0059] A layer of wear-resistant rubber is arranged on the surface where the ear 5 contacts the slide plate 11. The wear-resistant rubber can prevent slipping and reduce friction. The anti-slipping makes the present invention stable during use, and the reduced friction makes the present invention more durable.

[0060] In this embodiment, the box girder suspension hanger described in the above invention has been specifically implemented and applied in the Suwan Bridge project, which includes the following steps:

[0061] 1) Weld the slide plate 11 on both sides of the main beam 2.

[0062] 2) The crossbeam 4 is hoisted on the hoisting mechanism 3, the lifting lug 5 is welded on the crossbeam 4, a groove is processed on the lifting lug 5, a hole with a diameter of 40MM is opened in the crossbeam 4, a 32MM diameter fine-rolled threaded steel bar 7 is inserted into the crossbeam 4, and nuts 6 are installed on both sides of the crossbeam.

[0063] 3) Weld the fixing ears 8 onto the main beam 2.

[0064] 4) Install the groove of the lifting ear 5 on the slide plate 11 of the main beam 2.

[0065] 5) Use the fixing nut 9 to lock the finished rolled threaded steel bar 7 between a pair of fixing ears 8.

[0066] 6) Adjust the position of the nut 6 to the left and right to adjust the position of the lifting ear 5.

[0067] Example 2

[0068] Based on the above embodiments, this embodiment specifically describes the connection relationship between the hoisting device and the main beam in the suspension hanger for large-angle hoisting construction of a concrete box beam.

[0069] like Figure 4 As shown in FIG. 1 , it is a schematic diagram of the connection relationship between the lifting device and the main beam in this embodiment. As can be seen from the figure, the hanging device includes a cross beam 4, a lifting lug 5, a threaded steel bar 7, and a pair of push blocks 200.

[0070] Among them, the threaded steel bar 7 is horizontally fixed above the box girder main beam 2 and is threadedly connected to the cross beam 4. The threaded steel bar 7 vertically penetrates the cross beam 4. A pair of fixing ears 8 for supporting the threaded steel bar 7 are arranged at the upper end of the main beam 2. The pair of fixing ears 8 are respectively arranged at both ends of the threaded steel bar 7, and a fixing nut 9 is respectively arranged adjacent to the fixing ears 8. The fixing nuts 9 are fixed on the threaded steel bar 7. The threaded steel bar 7 is fixed to the main beam 2 by the cooperation of the fixing ears 8 and the fixing nuts 9.

[0071] When the position of the cross beam 4 needs to be adjusted, the fixing nuts 9 on both sides of the fixing ears 8 are first loosened, and then the threaded steel bar 7 is rotated, and the threaded steel bar 7 rotates to drive the cross beam 4 to move; in order to ensure the fixation of the threaded steel bar 7 and the position of the cross beam 4, a nut 6 is arranged adjacent to the cross beam 4. A lifting ear 5 is arranged at each end of the cross beam 4, and the distance between the two lifting ears 5 can be adjusted by a driving mechanism.

[0072] Reference Figure 5 and Figure 6 As can be seen from the figure, the cross beam 4 is a hollow structure, and the driving mechanism is arranged in the cross beam 4. The driving mechanism includes a bidirectional screw rod 14, a pair of first nuts 12, a second nut 13, and a plurality of support seats 16. The plurality of support seats 16 are arranged in the cross beam 4 at intervals for fixing the bidirectional screw rod 14.

[0073] Among them, the specific structure of the bidirectional screw rod 14 is as follows Figure 7 As shown in the figure, it can be seen that two thread grooves 141 with the same pitch and opposite rotation directions are respectively provided on both sides of the bidirectional screw rod 14, and the thread grooves 141 on both sides of the bidirectional screw rod 14 are symmetrical to each other.

[0074] Furthermore, first nuts 12 are respectively provided on the thread grooves 141 on both sides of the bidirectional screw rod 14. The first nut 12 is movably provided on the bidirectional screw rod 14. When the bidirectional screw rod 14 rotates, the first nut 12 performs linear motion. Since the thread grooves 141 on both sides are symmetrical to each other, when the bidirectional screw rod 14 rotates, the first nuts 12 on both sides of the crossbeam 4 move toward or away from each other.

[0075] See Figure 7When the bidirectional screw rod 14 rotates and drives the first nut on the left thread groove to move from end a to end b, the first nut on the right thread groove of the bidirectional screw rod 14 moves from end d to end c. The lengths of the thread grooves on both sides of the bidirectional screw rod 14 are the same. Since the thread grooves 141 on both sides of the bidirectional screw rod 14 are composed of two thread grooves with the same pitch and opposite rotation directions, when the first nut on the left side moves to the end b of the left slide groove, the bidirectional screw rod continues to rotate in the original direction, and the first nut on the left side moves from end b to end a. Correspondingly, when the first nut on the right side moves to the end c of the right slide groove, the first nut on the right side moves from end c to end d, so that the first nuts 12 on both sides cannot collide with each other at all times; the rotation of the bidirectional screw rod 14 can be driven by the motor 15.

[0076] The ears 5 on both sides of the beam 4 are fixed on the first nuts 12 respectively. The first nuts 12 drive the corresponding ears 5 to move synchronously. A long slot is opened at the lower end of the beam 4 to allow the ears 5 to pass through, which will not interfere with the movement of the ears 5.

[0077] When the bidirectional screw rod 14 rotates, the first nut 12 drives the pair of ears 5 to move toward each other. When the first nut 12 moves to the end of the thread groove 141, the pair of ears 5 change to move in opposite directions, thereby avoiding collision between the pair of ears 5 during movement.

[0078] The length of the thread grooves 141 on both sides is the maximum movable distance of the lifting lugs 5. The distance between the lifting lugs 5 can be changed according to the size of the box beam main beam 2, so that the lifting device disclosed in the present invention can be applied to lifting box beams of different sizes and has a wide range of applications.

[0079] A second nut 13 is provided in an area in the middle of the bidirectional screw rod 14 where no thread is provided. A through hole is provided on the second nut 13. A rolling bearing is provided in the through hole. The bidirectional screw rod 14 is inserted in the rolling bearing. When the bidirectional screw rod 14 rotates, the second nut 13 will not rotate with the rotation of the bidirectional screw rod 14. A threaded hole matching the threaded steel bar 7 is also provided on the bidirectional screw rod 14. The threaded steel bar 7 passes through the threaded hole and is threadedly connected with the second nut 13. When the threaded steel bar 7 rotates, the second nut 13 drives the cross beam 4 to move as a whole, thereby driving the ears 5 provided at both ends of the cross beam 4 to move synchronously. When the installation position of the box beam changes, the position of the ears 5 can be adjusted according to the change of the installation position of the box beam, so as to adjust the angular position of the box beam at will.

[0080] Go to See also Figure 4-5A push block 200 is provided on both sides of the width direction of the main beam, and an "L"-shaped groove for accommodating the push block 200 is provided on the side of the lifting ear 5 opposite to the push block 200. During the lifting process, the push block 200 is placed in the groove so that the push block 200 and the lifting ear 5 move synchronously. Therefore, the lifting of the main beam 2 can be achieved by the cooperation of the push block 200 and the lifting ear 5.

[0081] The specific structure of the push block 200 can be found in Figure 8-12 As can be seen from the figure, the push block 200 includes a plurality of connecting ears 22, a connecting plate 18, a slide plate 11 and a plurality of reinforcing ribs 10.

[0082] like Figure 8 and Fig. 9 As shown, a plurality of connecting ears 22 are fixed at even intervals on both sides of the main beam 2 in the width direction, and the connecting ears 22 are narrow at the top and wide at the bottom.

[0083] In this embodiment, the connecting ears 22 are in an inverted "T" shape, and each of the connecting ears 22 is provided with an arc-shaped protrusion 23. Fig.11 As shown, a through groove 19 matching the connecting ear 22 is provided on the connecting plate 18. When the push block 200 is installed on the main beam 2, the connecting ear 22 is first installed on both sides of the main beam 2 by welding or other fixing methods, and then the connecting ear 22 is inserted into the through groove 19 of the connecting plate 18, and the connecting plate 18 is pushed until the sides of the connecting plate 18 and the connecting ear 22 are flush.

[0084] See also Fig. 9 and Fig.10 As can be seen from the figure, the contact surface between the connecting ear 22 and the connecting plate 18 is an arc surface, and there is a gap between the other relative surfaces between the connecting ear 22 and the connecting plate 18, and no contact occurs. There is also a gap between the connecting plate 18 and the main beam 2. Therefore, during the installation process, the contact surface between the connecting plate 18 and the connecting ear 22 and the main beam 2 is greatly reduced, and the friction force is correspondingly reduced, so that the connecting ear 22 is easier to insert into the through groove 19, making the installation of the push block 200 more convenient.

[0085] like Fig.11As shown, a slide plate 11 is arranged in parallel and at intervals below the connecting plate 18, and a plurality of reinforcing ribs 10 are arranged between the slide plate 11 and the connecting plate 18. The plurality of reinforcing ribs 10 include longitudinal ribs 101 and oblique ribs 102. The longitudinal ribs 101 are vertically fixed between the slide plate 11 and the connecting plate 18, and the spacing between every two longitudinal ribs 101 is the same. The oblique ribs 102 are obliquely arranged between two adjacent longitudinal ribs 101 to divide the area between the two adjacent longitudinal ribs 101 into two triangular areas. The triangle has good stability. The reinforcing ribs 10 enable the push block to withstand higher external forces. During the lifting process, the push block 200 is subjected to greater external forces. Under the action of external forces, the structure of the push block 200 is more stable and less prone to damage due to the action of the reinforcing ribs 10.

[0086] like Fig.12 As shown, a plurality of evenly spaced sawtooth grooves 20 are provided at the lower end of the slide plate 11, and the length of the sawtooth groove 20 is smaller than the width of the slide plate 11, so that the sawtooth groove 20 does not penetrate the slide plate 11. Figure 6 A convex block 17 matching the serrated groove 20 is provided on the contact surface between the lifting ear 5 and the push block 200. During the lifting process, the convex block 17 is placed in the corresponding serrated groove 20. Since the serrated groove 20 does not penetrate the slide plate 11, the side of the lifting ear 5 abuts against the side of the serrated groove 20, so that during the lifting process, the lifting ear 5 and the push block 200 are not easy to slide relative to each other in the width direction. The lifting ear 5 and the push block 200 are connected by a toothed structure, so that the lifting ear 5 and the push block 200 cannot slide relative to each other in the length direction, ensuring the stability of the lifting process. A plurality of universal rollers 21 are provided below the slide plate 11 to facilitate moving the push block to the installation position.

[0087] Example 3

[0088] Based on the suspension hanger for large-angle hoisting construction of concrete box beams described in the above embodiment, this embodiment describes the method of using the suspension hanger as follows.

[0089] A method for using a suspension hanger for large-angle hoisting construction of a concrete box girder comprises the following steps:

[0090] Step 1, weld the connecting ears 22 of the push block to both sides of the main beam 2 of the box beam, insert the connecting ears 22 into the through grooves 19 of the connecting plate 18, and push the connecting plate 18 until the side of the connecting plate 18 is flush with the side of the connecting ears 22;

[0091] Step 2, loosen the fixing nut 9, adjust the position of the nut 6, and control the rotation of the threaded steel bar 7 to adjust the position of the lifting lug 5;

[0092] Step 3, control the bidirectional screw rod 14 to rotate, so that the ears 5 on both sides of the beam 4 move toward each other, until the protrusions 17 on the ears 5 are completely inserted into the serrated grooves 20 at the lower end of the slide plate 11;

[0093] Step 4: Lift the cross beam 4 and lift the box beam off the ground.

[0094] The suspension hanger for large-angle hoisting construction of a concrete box girder described in the present invention has an adjustable lug position, can be used to hoist a concrete box girder with a large angle, and the spacing between a pair of lugs is adjustable, can be applicable to box girders of different sizes, and is easy to use.

[0095] Example 4

[0096] In this embodiment, since the main tower project and the main beam project during the construction of the Suwan Bridge project adopt the above-mentioned suspension sling and its use method, first, the connecting ears 22 of the push block 200 are welded to both sides of the main beam 2 of the box beam, and the connecting ears 22 are inserted into the through grooves 19 of the connecting plate 18, and the connecting plate 18 is pushed until the side of the connecting plate 18 is flush with the side of the connecting ears 22; loosen the fixing nut 9, adjust the position of the nut 6, and control the rotation of the threaded steel bar 7 to adjust the position of the lifting ear 5; control the rotation of the bidirectional screw rod 14 so that the lifting ears 5 on both sides of the cross beam 4 move toward each other until the protrusions 17 on the lifting ears 5 are completely inserted into the serrated grooves 20 at the lower end of the slide plate 11; lift the cross beam 4 to lift the box beam off the ground.

[0097] The above method can be used to complete the material transportation of the main tower and main beam of the bridge, saving human resources and being smooth and efficient.

[0098] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A method for using a suspension hanger for large-angle hoisting construction of a concrete box girder, characterized in that: The method of use includes: Step 1, welding the connecting ears (22) of the push block (200) to both sides of the main beam (2) of the box beam, inserting the connecting ears (22) into the through grooves (19) of the connecting plate (18), and pushing the connecting plate (18) until the side surface of the connecting plate (18) is flush with the side surface of the connecting ears (22); Step 2, loosen the fixing nut (9), control the rotation of the threaded steel bar (7) to adjust the position of the lifting lug (5); Step 3, controlling the bidirectional screw rod (14) to rotate so that the ears (5) on both sides of the cross beam (4) move toward each other until the protrusions (17) on the ears (5) are completely inserted into the serrated grooves (20) at the lower end of the slide plate (11); Step 4: Lift the cross beam (4) to lift the box beam off the ground; The hanging device for large-angle hoisting construction of a concrete box beam comprises: a cross beam (4), each of which is provided with a lifting lug (5) at both ends in the length direction; a threaded steel bar (7), which is horizontally fixed above the main beam (2) of the box beam and is threadedly connected to the cross beam (4), and the threaded steel bar (7) vertically penetrates the cross beam (4); a pair of push blocks (200), which are respectively arranged on both sides of the main beam (2) in the width direction; Wherein, an "L"-shaped groove for accommodating the push block is provided on the side of the lifting ear (5) opposite to the push block (200); during the lifting process, the push block (200) is placed in the "L"-shaped groove so that the push block (200) and the lifting ear (5) are linked; The push block (200) comprises: A plurality of connection ears (22) are fixed at even intervals on both sides of the main beam (2) in the width direction, the connection ears (22) being of a structure narrow at the top and wide at the bottom, and each of the connection ears (22) is provided with an arc-shaped protrusion (23); A connecting plate (18) movably connected to the plurality of connecting ears (22), and a plurality of through slots (19) matching the connecting ears (22) are provided on the upper end of the connecting plate (18); A slide plate (11) is arranged in parallel with the connecting plate (18) and spaced apart from each other, and a plurality of sawtooth grooves (20) arranged at even intervals are formed at the lower end of the slide plate (11); A plurality of reinforcing ribs (10) are arranged between the chute plate (11) and the connecting plate (18), the plurality of reinforcing ribs (10) comprising a plurality of longitudinal ribs (101) and a plurality of oblique ribs (102), the plurality of longitudinal ribs (101) are vertically fixed between the chute plate (11) and the connecting plate (18), and the oblique ribs (102) are obliquely fixed between two adjacent longitudinal ribs (101) so as to divide the area between the two adjacent longitudinal ribs (101) into two triangular areas; A convex block (17) matching the sawtooth groove (20) is provided on a side of the lifting ear (5) opposite to the slide plate (11); during the lifting process, the convex block (17) is placed in the corresponding sawtooth groove (20); The cross beam (4) is a hollow structure, and a driving mechanism for driving the lifting lug (5) to move is arranged inside the cross beam (4); The driving mechanism comprises: A bidirectional screw rod (14), wherein two thread grooves (141) with the same pitch and opposite rotation directions are respectively arranged on both sides of the bidirectional screw rod (14), and the thread grooves on both sides of the bidirectional screw rod (14) are symmetrical to each other, and the length of the thread groove (141) is the maximum distance that the lifting ear (5) can move; A pair of first nuts (12) movably disposed on the thread grooves (141) on both sides of the bidirectional screw rod (14); A plurality of support seats (16) fixed in the crossbeam (4) and used to support the bidirectional screw rod (14); The lifting lug (5) is fixed to the lower end of the first nut (12), and when the bidirectional screw rod (14) rotates, the first nut (12) drives the corresponding lifting lug (5) to move, so that the lifting lugs at both ends of the beam move toward each other or move away from each other; A plurality of universal rollers (21) are provided at the lower end of the slide plate (11); When the bidirectional screw rod (14) rotates and drives the first nut (12) on the left thread groove (141) to move from the left end to the right end, the first nut (12) on the right thread groove (141) of the bidirectional screw rod (14) moves from the right end to the left end. The thread grooves (141) on both sides of the bidirectional screw rod (14) are of the same length. Since the thread grooves (141) on both sides of the bidirectional screw rod (14) are composed of two thread grooves (141) with the same pitch and opposite rotation directions, when the first nut (12) on the left side is rotated, the first nut (12) on the right thread groove (141) of the bidirectional screw rod (14) moves from the right end to the left end. When the first nut (12) moves to the right end of the left side slide plate (11), the bidirectional screw rod (14) continues to rotate in the original direction, and the first nut (12) on the left side moves from the right end to the left end. Correspondingly, when the first nut (12) on the right side moves to the left end of the right side slide plate (11), the first nut (12) on the right side moves from the left end to the right end, so that the first nuts (12) on both sides can never collide with each other. The rotation of the bidirectional screw rod (14) can be driven by a motor (15); A pair of fixing ears (8) for supporting the threaded steel bar (7) are arranged at the upper end of the box girder main beam (2); the pair of fixing ears (8) are arranged at two ends of the threaded steel bar (7), and a fixing nut (9) is arranged adjacent to each fixing ear (8); the fixing nut (9) is sleeved on the threaded steel bar (7).

2. The method for using the suspension sling according to claim 1, characterized in that: A second nut (13) is provided in the middle of the bidirectional screw rod (14), a through hole is provided on the second nut (13), a rolling bearing is provided in the through hole, and the bidirectional screw rod (14) is inserted in the rolling bearing.

3. The method for using the suspension sling according to claim 1, characterized in that: The second nut (13) is also provided with a threaded hole matching the threaded steel bar (7), and the threaded steel bar (7) passes through the threaded hole and is threadedly connected to the second nut (13).

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