Quick lifting appliance and device for concrete prefabricated box girder

Abstract

The utility model discloses a concrete precast box girder quick hoisting sling and device, which comprises a front hoisting part and a rear hoisting part, hoisting rings are arranged on the front hoisting part and the rear hoisting part, an adjusting part for adjusting the distance between the front hoisting part and the rear hoisting part is arranged on the front hoisting part and the rear hoisting part, a supporting part is arranged below the adjusting part, and the supporting part is connected with the hoisting ring. One end of the supporting part is detachably connected with the front lifting part, and the other end of the supporting part is detachably connected with the rear lifting part. The lifting appliance can be fixedly connected with the concrete prefabricated box girder only by operating and regulating the regulating component and the supporting component, and compared with the existing scheme, a mechanism needing to be operated and regulated is omitted in one group of lifting appliances, so that the time required for fixedly connecting the lifting appliance with the concrete prefabricated box girder is saved, and the working efficiency is improved. The lifting work efficiency is improved, and the technical problems that in the prior art, the number of mechanisms needing to be operated and regulated for fixed connection of the lifting appliance and the concrete prefabricated box girder is large, and the lifting work efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete prefabricated box beam hoisting, in particular to a fast hoisting hoist and device for concrete prefabricated box beams. Background Art

[0002] The Chinese patent application publication number CN110921498A discloses a prefabricated concrete box girder rapid lifting sling, including a left lifting device and a right lifting device, the left lifting device and the right lifting device are provided with an adjustment device for adjusting the distance between the two, the left lifting device and the right lifting device have the same structure and both include an L-shaped bracket, a first positioning mechanism and a second positioning mechanism, the first positioning mechanism is installed on the upper half of the L-shaped bracket, the second positioning mechanism is installed on the lower half of the L-shaped bracket, the bottom of the L-shaped bracket is provided with two symmetrically arranged auxiliary walking wheels, and the top of the L-shaped bracket is provided with two symmetrically arranged lifting rings. The above disclosed prefabricated concrete box girder rapid lifting sling can quickly lift prefabricated box girders of different specifications without the need for steel wire rope bundling, and no mutual friction between the steel wire rope and the prefabricated box girder will be generated during the lifting process.

[0003] However, in actual use, a set of hoists needs to adjust the first positioning mechanism and the second positioning mechanism of the adjusting device, and adjust the three components separately to achieve the fixed connection between the hoist and the precast concrete box girder. The fixed connection requires many mechanisms to be operated and adjusted, which leads to low efficiency in the hoisting of the precast concrete box girder. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a prefabricated concrete box girder rapid lifting sling and device, which solves the technical problems in the prior art that the fixed connection between the sling and the prefabricated concrete box girder requires multiple operating and regulating mechanisms and the lifting work efficiency is low.

[0005] The technical solution of the utility model is achieved as follows: a quick lifting sling for prefabricated concrete box girders, comprising a front lifting component and a rear lifting component, both of which are provided with lifting rings, the front lifting component and the rear lifting component are provided with adjusting components for adjusting the distance between the two, a supporting component is provided below the adjusting component, one end of the supporting component is detachably connected to the front lifting component, and the other end is detachably connected to the rear lifting component.

[0006] Preferably, the supporting component is a supporting plate, and both the front lifting component and the rear lifting component are provided with fixing grooves, and the fixing grooves are adapted to the supporting plate.

[0007] Preferably, a third through hole is provided on the support plate, and a fourth through hole is provided on the fixing groove, and both the third through hole and the fourth through hole are adapted to fit the second fixing bolt.

[0008] Preferably, there are at least two fourth through holes on the fixing groove, and at least two fourth through holes are arranged along the longitudinal direction of the fixing groove.

[0009] Preferably, the front lifting component and the rear lifting component have the same structure and are both L-shaped structures.

[0010] Preferably, the adjusting component includes a connecting plate, which is laterally provided with at least two first through holes, and the front lifting component and the rear lifting component are respectively provided with slots, the connecting plate is plugged into the slots, and a second through hole is provided on the side wall of the slot, and both the first through hole and the second through hole are adapted to the first fixing bolt.

[0011] Preferably, the first through hole, the second through hole, the third through hole and the fourth through hole are of the same size.

[0012] Preferably, the slot is also provided with at least two second through holes in the transverse direction.

[0013] Preferably, the adjusting component comprises a lead screw, and lead screw nuts are respectively embedded in the front lifting component and the rear lifting component, and both ends of the lead screw are respectively threadedly connected to the two lead screw nuts.

[0014] A quick lifting device for a prefabricated concrete box girder comprises at least three groups of the quick lifting slings for the prefabricated concrete box girder mentioned above, wherein the three groups of the quick lifting slings for the prefabricated concrete box girder are respectively hung at the middle top plate and the end wing plates of the prefabricated concrete box girder; the support plate on the quick lifting sling for the prefabricated concrete box girder located at the end wing plates supports the bottom surface of the end wing plates, and the support plate on the quick lifting sling for the prefabricated concrete box girder located at the middle top plate is inserted along the mounting hole of the prefabricated concrete box girder and supports the bottom surface of the middle top plate.

[0015] The beneficial effects of the utility model are as follows: 1. The sling provided by the utility model is provided with an adjusting component and a supporting component. The fixed connection between the sling and the precast concrete box girder can be achieved by only operating and adjusting the adjusting component and the supporting component. Compared with the existing scheme, a mechanism that needs to be operated and adjusted is omitted in a group of slings, which saves the time required for the fixed connection between the sling and the precast concrete box girder and improves the lifting work efficiency.

[0016] 2. The utility model adjusts the distance between the front lifting component and the rear lifting component through the adjusting component, utilizes the front lifting component and the rear lifting component to clamp and fit tightly with the front and rear of the precast concrete box girder respectively, and then utilizes the supporting component to respectively support the bottom surface of the wing plate at the upper end portion and the bottom surface of the middle top plate of the precast concrete box girder, thereby realizing the limited fixation of the precast concrete box girder in two vertical directions, and adjusting the distance between the front lifting component and the rear lifting component, so as to quickly fix and lift the precast concrete box girders of different specifications, without the need for binding with steel wire ropes, and no mutual friction between the steel wire ropes and the precast concrete box girder will be generated during the lifting process, thereby improving the lifting safety.

[0017] 3. The first through hole, the second through hole, the third through hole and the fourth through hole of the utility model are of the same size, that is, the first fixing bolt and the second fixing bolt can be respectively matched with the first through hole, the second through hole, the third through hole and the fourth through hole, which is beneficial to improve the versatility, interchangeability and economy of the first fixing bolt and the second fixing bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a quick lifting device for prefabricated concrete box beams of the utility model.

[0020] Figure 2 It is a schematic diagram of the quick lifting hoist of the prefabricated concrete box girder of the utility model.

[0021] Figure 3 It is a connection schematic diagram of the rear lifting component, the connecting plate and the supporting plate of the utility model.

[0022] In the figure, 1 is a front lifting component, 2 is a rear lifting component, 3 is a connecting plate, 4 is a supporting plate, 5 is a slot, 6 is a first through hole, 7 is a second through hole, 8 is a first fixing bolt, 9 is a fixing slot, 10 is a third through hole, 11 is a fourth through hole, 12 is a second fixing bolt, 13 is a prefabricated concrete box girder, 14 is a middle top plate, 15 is an end wing plate, 16 is a mounting hole, and 17 is a lifting ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1, a quick lifting device for prefabricated concrete box beam, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a front lifting component 1 and a rear lifting component 2, and the front lifting component 1 and the rear lifting component 2 are both provided with a lifting ring 17. The front lifting component 1 and the rear lifting component 2 are provided with an adjusting component for adjusting the distance between the two. A supporting component is provided below the adjusting component, and one end of the supporting component is detachably connected to the front lifting component 1, and the other end is detachably connected to the rear lifting component 2. The lifting device provided by the utility model is provided with an adjusting component and a supporting component. Only by operating and adjusting the adjusting component and the supporting component, the fixed connection between the lifting device and the concrete prefabricated box beam can be achieved. Compared with the existing scheme, a mechanism that needs to be operated and adjusted is omitted in a group of lifting devices, which saves the time required for the fixed connection between the lifting device and the concrete prefabricated box beam, improves the lifting work efficiency, and solves the technical problem that the fixed connection between the lifting device and the concrete prefabricated box beam in the prior art requires many mechanisms to be operated and adjusted, and the lifting work efficiency is low. The setting of the lifting ring 17 can facilitate the bundling of the wire rope and facilitate the lifting operation.

[0025] Embodiment 2, based on embodiment 1, a prefabricated concrete box beam quick lifting device, such as Figure 2 and Figure 3 As shown, the support component is a support plate 4, and a fixing groove 9 is provided on the front lifting component 1 and the rear lifting component 2, and the fixing groove 9 is adapted to the support plate 4. After the front lifting component 1 and the rear lifting component 2 are clamped and fitted with the front and rear of the precast concrete box beam 13 respectively, the support plate 4 is then inserted along the fixing groove 9, so that the two ends of the support plate 4 are overlapped on the fixing groove 9 of the front lifting component 1 and the fixing groove 9 of the rear lifting component 2 respectively, and the support plate 4 is used to support the bottom surface of the precast concrete box beam 13, so as to realize the upper limit fixing in two vertical directions of the front and rear surfaces and the bottom surface of the precast concrete box beam 13. The support plate 4 is provided with a rubber protective pad on the surface used to clamp the precast concrete box beam 13; this can reduce the wear on the precast concrete box beam 13.

[0026] Embodiment 3, based on embodiment 2, a concrete prefabricated box beam rapid lifting hoist, such as Figure 2 and Figure 3As shown, the support plate 4 is provided with a third through hole 10, and the fixing groove 9 is provided with a fourth through hole 11, and the third through hole 10 and the fourth through hole 11 are both adapted to the second fixing bolt 12. After the two ends of the support plate 4 are respectively overlapped on the fixing groove 9 of the front lifting component 1 and the fixing groove 9 of the rear lifting component 2, the third through hole 10 and the fourth through hole 11 are coaxially aligned, and the second fixing bolt 12 is inserted into the third through hole 10 and the fourth through hole 11 in sequence to fix the position of the support plate 4, thereby avoiding the deviation of the support plate 4 during the rapid lifting of the concrete prefabricated box beam, and improving the safety of the entire lifting device.

[0027] Embodiment 4, based on embodiment 3, a concrete prefabricated box beam rapid lifting hoist, such as Figure 2 and Figure 3 As shown, there are at least two fourth through holes 11 on the fixing groove 9, and at least two fourth through holes 11 are arranged along the longitudinal direction of the fixing groove 9. By fixing the support plate 4 with the fourth through holes 11 at different heights, the hoist can quickly fix and lift concrete precast box beams 13 of different specifications. When the bottom surface of the support plate 4 does not contact the bottom wall of the fixing groove 9, a cushion block is arranged between the bottom surface of the support plate 4 and the bottom wall of the fixing groove 9 to avoid the situation where the pressure of the concrete precast box beam 13 on the support plate 4 is all applied to the second fixing bolt 12, thereby improving the safety of the entire hoist.

[0028] Embodiment 5, based on embodiment 4, a concrete prefabricated box beam rapid lifting hoist, such as Figure 2 and Figure 3 As shown, the front lifting component 1 and the rear lifting component 2 have the same structure and are both L-shaped structures. The operation of the adjustment component drives the front lifting component 1 and the rear lifting component 2 of the L-shaped structure to move toward or relative to each other, that is, the front lifting component 1 and the rear lifting component 2 both move along the adjustment component toward the middle of the adjustment component or the front lifting component 1 and the rear lifting component 2 move along the adjustment component toward the end of the adjustment component. The front lifting component 1 and the rear lifting component 2 are provided with rubber protective pads on the surface used to clamp the precast concrete box beam 13; this can reduce the wear on the precast concrete box beam 13. The part of the L-shaped structure located in the front and rear of the precast concrete box beam 13 clamps the front and rear of the precast concrete box beam 13, and the part of the L-shaped structure located on the top surface of the precast concrete box beam 13 presses the top surface of the precast concrete box beam 13 and cooperates with the bottom surface of the precast concrete box beam 13 supported by the support plate 4, so as to achieve the upper limit fixation on the front, rear, bottom and top surfaces of the precast concrete box beam 13 and the two vertical directions.

[0029] Embodiment 6, based on embodiment 5, a fast lifting device for prefabricated concrete box beam, such as Figure 2 and Figure 3As shown, the adjustment component includes a connecting plate 3, at least two first through holes 6 are provided in the lateral direction of the connecting plate 3, slots 5 are provided on the front lifting component 1 and the rear lifting component 2 respectively, the connecting plate 3 is plugged and matched with the slots 5, a second through hole 7 is provided on the side wall of the slot 5, and both the first through hole 6 and the second through hole 7 are adapted to the first fixing bolt 8. By adjusting the first through holes 6 at different positions on the connecting plate 3 and the second through hole 7 on the side wall of the slot 5 to be coaxial, the length of the connecting plate 3 extending into the front lifting component 1 or the rear lifting component 2 is adjusted, thereby adjusting the distance between the front lifting component 1 and the rear lifting component 2. After the front lifting component 1 and the rear lifting component 2 are clamped and fitted with the front and rear ends of the prefabricated concrete box girder 13 respectively, the first through hole 6 and the second through hole 7 are coaxially aligned, and the first fixing bolt 8 is inserted into the first through hole 6 and the second through hole 7 in sequence to fix the positions of the front lifting component 1 and the rear lifting component 2, thereby avoiding the relative position movement of the front lifting component 1 and the rear lifting component 2 during the rapid lifting of the prefabricated concrete box girder, thereby improving the safety of the entire lifting device.

[0030] Embodiment 7, based on embodiment 6, a concrete prefabricated box beam fast lifting hoist, such as Figure 2 and Figure 3 As shown, the first through hole 6, the second through hole 7, the third through hole 10 and the fourth through hole 11 are of the same size. The first through hole, the second through hole, the third through hole and the fourth through hole are of the same size, that is, the first fixing bolt and the second fixing bolt can be respectively matched with the first through hole, the second through hole, the third through hole and the fourth through hole, which is conducive to improving the versatility, interchangeability and economy of the first fixing bolt and the second fixing bolt.

[0031] Embodiment 8, based on embodiment 7, a concrete prefabricated box beam fast lifting hoist, such as Figure 2 and Figure 3 As shown, the slot 5 is also provided with at least two second through holes 7 in the transverse direction. By adjusting the first through holes 6 at different positions on the connecting plate 3 and the second through holes 7 at different positions on the side wall of the slot 5 to be coaxially arranged, the length of the connecting plate 3 extending into the front lifting component 1 or the rear lifting component 2 can be further adjusted, and the adjustable specification of the distance between the front lifting component 1 and the rear lifting component 2 is improved, so that more concrete prefabricated box girders of different specifications can be adapted for rapid fixing and lifting.

[0032] When the eighth embodiment is implemented, the first through holes 6 at different positions on the connection plate 3 are adjusted to be coaxially arranged with the second through holes 7 at different positions on the side wall of the slot 5, so as to adjust the length of the connection plate 3 extending into the front lifting component 1 or the rear lifting component 2, and then adjust the distance between the front lifting component 1 and the rear lifting component 2. After the front lifting component 1 and the rear lifting component 2 are respectively clamped and fitted with the front and rear of the prefabricated concrete box girder 13, the first through hole 6 and the second through hole 7 are coaxially aligned, and the first fixing bolt 8 is inserted into the first through hole 6 and the second through hole 7 in sequence, and then the support plate 4 is inserted into the fixing groove 9. After the two ends of the support plate 4 are respectively overlapped on the fixing groove 9 of the front lifting component 1 and the fixing groove 9 of the rear lifting component 2, the third through hole 10 and the fourth through hole 11 are coaxially aligned, and the second fixing bolt 12 is inserted into the third through hole 10 and the fourth through hole 11 in sequence to fix the position of the support plate 4, so as to realize the clamping and fixing of the front, rear, top and bottom surfaces of the prefabricated concrete box girder 13.

[0033] Embodiment 9, based on embodiment 5, a fast lifting device for prefabricated concrete box beam, such as Figure 1 As shown, the adjusting component 3 includes a lead screw, and lead screw nuts are respectively embedded in the front lifting component 1 and the rear lifting component 2, and the two ends of the lead screw are respectively threadedly connected with the two lead screw nuts. By adjusting the different positions of the two lead screw nuts on the lead screw, the adjustment of the distance between the front lifting component 1 and the rear lifting component 2 is achieved, and the concrete prefabricated box beams of different specifications are quickly adjusted, thereby improving the applicability of the entire lifting device. When the lead screw is rotated, the two lead screw nuts move toward each other or relatively, that is, the two lead screw nuts move toward the middle of the lead screw or the two lead screw nuts move toward the ends of the lead screw respectively.

[0034] Embodiment 10, based on any one of Embodiments 1 to 9, a quick lifting device for prefabricated concrete box beam, such as Figure 1 , Figure 2 and Figure 3As shown, it includes at least three groups of the above-mentioned prefabricated concrete box girder quick lifting hoisting devices, and the three groups of the prefabricated concrete box girder quick lifting hoisting devices are respectively hung at the middle top plate 14 of the prefabricated concrete box girder 13 and the end wing plate 15 of the prefabricated concrete box girder 13; the support plate 4 on the prefabricated concrete box girder quick lifting hoisting device located at the end wing plate 15 supports the bottom surface of the end wing plate 15, and the support plate 4 on the prefabricated concrete box girder quick lifting hoisting device located at the middle top plate 14 is inserted along the mounting hole 16 of the prefabricated concrete box girder 13 and supports the bottom surface of the middle top plate 14. The front lifting component 1 and the rear lifting component 2 are respectively clamped and fitted with the front and rear of the precast concrete box girder 13, and then the support plate 4 is used to support the bottom surface of the wing plate 15 at the upper end of the precast concrete box girder and the bottom surface of the middle top plate 14, so that the precast concrete box girder 13 is limited and fixed on four surfaces in two vertical directions, namely, the front, rear, top and bottom surfaces. The distance between the front lifting component 1 and the rear lifting component 2 is adjusted, so that precast concrete box girders of different specifications can be quickly fixed and lifted without the need for binding with steel wire ropes. No mutual friction between the steel wire ropes and the precast concrete box girder will be generated during the lifting process, thereby improving the lifting safety.

[0035] When four groups of the above-mentioned prefabricated concrete box girder quick lifting slings are provided, preferably two groups of the above-mentioned prefabricated concrete box girder quick lifting slings are provided in the mounting hole 16, that is, the two groups of the above-mentioned prefabricated concrete box girder quick lifting slings are arranged in parallel and symmetrically in the mounting hole 16 along the center position of the prefabricated concrete box girder 13, and the two groups of the above-mentioned prefabricated concrete box girder quick lifting slings are used to support the bottom surface of the middle top plate 14, and the other two groups of the above-mentioned prefabricated concrete box girder quick lifting slings are also arranged in parallel and symmetrically at the end wing plate 15 along the center position of the prefabricated concrete box girder 13, and respectively support the bottom surfaces of the end wing plates 15.

[0036] When implementing Example 10, three sets of prefabricated concrete box beam quick lifting slings are taken as an example, one set of prefabricated concrete box beam quick lifting slings is set at the center of the prefabricated concrete box beam 13, and the distance between the front lifting component 1 and the rear lifting component 2 is adjusted in the prefabricated concrete box beam quick lifting sling. After the front lifting component 1 and the rear lifting component 2 are clamped and fitted with the front and rear of the prefabricated concrete box beam 13 respectively, the first through hole 6 and the second through hole 7 are coaxially aligned, and the first fixing bolt 8 is inserted into the first through hole 6 and the second through hole 7 in sequence, and then the support plate 4 is inserted into the fixing groove 9. When the two ends of the support plate 4 are respectively overlapped on the fixing groove 9 of the front lifting component 1 and the rear lifting component 2, the first through hole 6 and the second through hole 7 are coaxially aligned, and the first fixing bolt 8 is inserted into the first through hole 6 and the second through hole 7 in sequence, and then the support plate 4 is inserted into the fixing groove 9. After being installed on the fixing groove 9 of the component 2, the third through hole 10 and the fourth through hole 11 are coaxially aligned, and the second fixing bolt 12 is inserted into the third through hole 10 and the fourth through hole 11 in sequence to fix the position of the support plate 4, so as to realize the clamping and fixing of the front, back, top surface and bottom surface of the precast concrete box girder 13. Here, the support plate 4 is inserted into the mounting hole 16 of the precast concrete box girder 13 and supports the bottom surface of the middle top plate 14; then the other two groups of precast concrete box girder rapid lifting slings are arranged along the center position of the precast concrete box girder 13 in parallel and symmetrically. The specific steps of fixing and connecting the slings are as above. Here, the support plate 4 supports the bottom surface of the end wing plate 15.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A quick lifting sling for prefabricated concrete box beams, characterized in that: The invention comprises a front lifting component (1) and a rear lifting component (2), wherein the front lifting component (1) and the rear lifting component (2) are both provided with lifting rings (17), the front lifting component (1) and the rear lifting component (2) are provided with adjusting components for adjusting the distance between the two, and a supporting component is provided below the adjusting component, wherein one end of the supporting component is detachably connected to the front lifting component (1) and the other end is detachably connected to the rear lifting component (2).

2. The quick lifting sling for prefabricated concrete box beam according to claim 1 is characterized in that: The supporting component is a supporting plate (4), and both the front lifting component (1) and the rear lifting component (2) are provided with fixing grooves (9), and the fixing grooves (9) are adapted to the supporting plate (4).

3. The quick lifting sling for prefabricated concrete box beam according to claim 2 is characterized in that: The support plate (4) is provided with a third through hole (10), the fixing groove (9) is provided with a fourth through hole (11), and both the third through hole (10) and the fourth through hole (11) are compatible with the second fixing bolt (12).

4. The quick lifting sling for prefabricated concrete box beam according to claim 3 is characterized in that: The fixing groove (9) has at least two fourth through holes (11), and the at least two fourth through holes (11) are arranged along the longitudinal direction of the fixing groove (9).

5. The quick lifting sling for prefabricated concrete box beam according to claim 4 is characterized in that: The front lifting component (1) and the rear lifting component (2) have the same structure and are both L-shaped structures.

6. The fast lifting device for prefabricated concrete box beam according to claim 5 is characterized in that: The adjusting component comprises a connecting plate (3), at least two first through holes (6) are provided in the lateral direction of the connecting plate (3), slots (5) are provided on the front lifting component (1) and the rear lifting component (2), the connecting plate (3) and the slots (5) are plugged into each other, a second through hole (7) is provided on the side wall of the slot (5), and both the first through hole (6) and the second through hole (7) are adapted to fit the first fixing bolt (8).

7. The fast lifting device for prefabricated concrete box beam according to claim 6 is characterized in that: The first through hole (6), the second through hole (7), the third through hole (10) and the fourth through hole (11) are of the same size.

8. The fast lifting sling for prefabricated concrete box beam according to claim 7, characterized in that: The slot (5) is also provided with at least two second through holes (7) in the transverse direction.

9. The fast lifting sling for prefabricated concrete box beam according to claim 5, characterized in that: The adjusting component comprises a lead screw, and lead screw nuts are respectively embedded in the front lifting component (1) and the rear lifting component (2), and the two ends of the lead screw are respectively threadedly connected to the two lead screw nuts.

10. A quick lifting device for a prefabricated concrete box beam, characterized in that: The invention comprises at least three groups of quick lifting slings for precast concrete box girders as described in any one of claims 2 to 9, wherein the three groups of quick lifting slings for precast concrete box girders are respectively hung at the middle top plate (14) of the precast concrete box girder (13) and the end wing plate (15) of the precast concrete box girder (13); the support plate (4) on the quick lifting sling for precast concrete box girders located at the end wing plate (15) supports the bottom surface of the end wing plate (15), and the support plate (4) on the quick lifting sling for precast concrete box girders located at the middle top plate (14) is inserted along the mounting hole (16) of the precast concrete box girder (13) and supports the bottom surface of the middle top plate (14).

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