Prefabricated bridge deck slab hoisting assembly, hoisting tool and using method

Abstract

The invention relates to a prefabricated bridge deck slab hoisting assembly, a hoisting tool and a using method, the prefabricated bridge deck slab hoisting assembly comprises four hoisting units, every two hoisting units form one group and are divided into two parallel groups, the two hoisting units of each group are oppositely arranged in parallel, and each hoisting unit comprises a fixed pulley block, a lower hoisting point steel wire rope and two lower hoisting point lifting lugs; the two lower lifting point lifting lugs are arranged at intervals, the fixed pulley blocks are installed on the lower lifting point lifting lugs, the two ends of the lower lifting point steel wire rope penetrate through the fixed pulley blocks at the positions of the two lower lifting point lifting lugs respectively, vertically extend downwards and are used for being connected with a prefabricated bridge deck slab to be lifted, and the lower lifting point steel wire rope between the two lower lifting point lifting lugs is parallel to the horizontal plane. Through the application, the stress of the prefabricated bridge deck slab to be hoisted in the hoisting process can be effectively dispersed, so that the tensile force borne by each pre-buried hoisting point is more uniform, and the cracking risk of the concrete prefabricated bridge deck slab in the hoisting process is effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to a prefabricated bridge deck hoisting assembly, a hoisting device and a method of use. Background Art

[0002] At present, steel-concrete composite beams have been widely used in bridge engineering. In order to reduce the concrete pouring work at the bridge site and improve the quality of concrete bridge decks, especially when ultra-high performance concrete that requires steaming is used, precast concrete bridge decks are often used. When the bridge deck width is large and the volume of wet joint concrete should be minimized, the size of a single concrete precast bridge deck will be larger. For this type of large-sized concrete precast bridge deck, before it is superimposed with the steel beam, it needs reliable hoists for hoisting during transportation in the precast plant to ensure that the concrete precast bridge deck will not be damaged under hoisting conditions.

[0003] The current precast concrete bridge deck hoists generally have 4 or 6 lifting points on the concrete slab. For large-sized precast concrete bridge decks, when the commonly used 4-point lifting scheme is adopted, the tensile stress on the precast concrete bridge deck is too large and cannot meet the use requirements; if an additional row of lifting points is added to the precast concrete bridge deck on the basis of the 4-point lifting scheme, that is, 6-point lifting is adopted, since large-sized precast concrete bridge decks often have shear nail grooves in the middle of the slab span, the additional middle row of embedded lifting points are on the weakened section of the precast concrete bridge deck where the shear nail grooves are located. The anchoring of the embedded lifting points is difficult to meet the requirements, and the stress on the weakened section is too large to meet the use requirements. And when a lifting scheme with more than 4 points is adopted on the precast concrete bridge deck, it is difficult to ensure that each lifting point is effectively and evenly stressed.

[0004] Therefore, it is urgent to find a hoisting structure for a precast concrete bridge deck to solve the current technical problem that when hoisting large-sized precast concrete bridge decks, the precast concrete bridge decks are damaged due to hoisting conditions. Summary of the invention

[0005] The present application provides a precast bridge deck hoisting assembly, a hoisting device and a method of use, which can solve the current technical problem that when hoisting large-sized precast concrete bridge decks, the precast concrete bridge decks are damaged due to the hoisting conditions.

[0006] In the first aspect, an embodiment of the present application provides a prefabricated bridge deck lifting assembly, comprising: four lifting units, each two lifting units forming a group, divided into two parallel groups, and the two lifting units in each group are arranged opposite to each other and in parallel, each lifting unit comprises a fixed pulley block, a lower lifting point steel wire rope and two lower lifting point lifting ears, a spacing is provided between the two lower lifting point lifting ears, and the fixed pulley block is installed on the lower lifting point lifting ears, both ends of the lower lifting point steel wire rope respectively pass through the fixed pulley blocks at the two lower lifting point lifting ears, and extend vertically downward for connecting the prefabricated bridge deck to be lifted, and the lower lifting point steel wire rope between the two lower lifting point lifting ears is parallel to the horizontal plane.

[0007] In combination with the first aspect, in one embodiment, the lower suspension point ear is composed of two lower suspension point ear plates, and the fixed pulley block is installed on the inner sides of the two lower suspension point ear plates.

[0008] In combination with the first aspect, in one embodiment, the fixed pulley assembly includes a pulley, a pulley limiter and a pin shaft, the pulley and the pulley limiter are installed on the inner sides of two lower suspension point ear plates through the pin shaft, and the pulley limiter is located between the pulley and the lower suspension point ear plates.

[0009] In combination with the first aspect, in one embodiment, each lower hanging point ear plate is welded with a plate on both sides, and the pin shaft passes through the plate, and a plurality of stiffening ribs are provided on the outer top of the lower hanging point ear plate, and the top surface of the stiffening ribs is in the same horizontal plane as the top surface of the lower hanging point ear plate.

[0010] In combination with the first aspect, in one embodiment, a circle of guide grooves for accommodating the wire rope of the lower suspension point is provided in the middle of the outer circle of the pulley.

[0011] In the second aspect, an embodiment of the present application provides a hoisting device, comprising two parallel longitudinal beams, two parallel upper hanging point connecting beams and four parallel lower hanging point connecting beams are connected between the two longitudinal beams, and the connecting beams and the longitudinal beams are vertically connected; an upper hanging point lifting ear is installed at each end of the top surface of the two longitudinal beams, and each of the upper hanging point connecting beams is located between the two upper hanging point lifting ears; the bottom surfaces of the two longitudinal beams are provided with the prefabricated bridge deck lifting components as described above, and the two lifting units of each group are respectively installed at the two ends of the two lower hanging point connecting beams.

[0012] In combination with the second aspect, in one implementation, the cross-sectional stiffness of the lower suspension point connecting cross-beam is greater than the cross-sectional stiffness of the upper suspension point connecting cross-beam.

[0013] In combination with the second aspect, in one implementation, each of the upper hanging point lifting ears is connected to an upper hanging point shackle, and the upper hanging point shackle is connected to an upper hanging point wire rope.

[0014] In combination with the second aspect, in one embodiment, the upper hanging point connects the horizontal beam and the longitudinal beam to form a rectangle, each of the upper hanging point lifting ears is located at the four corners of the rectangle, and the plane direction of the upper hanging point lifting ear ear plate is consistent with the force direction of the upper hanging point wire rope during lifting.

[0015] On the third aspect, an embodiment of the present application provides a method for using the above-mentioned sling, the steps comprising: selecting a sling based on the size and lifting weight of the prefabricated bridge deck; connecting the upper hanging point wire rope to the upper hanging point lifting lug through the upper hanging point shackle, and connecting the lower hanging point lifting lug to the lower hanging point shackle through the lower hanging point wire rope, and the lengths of all the upper hanging point wire ropes are the same, and the lengths of all the lower hanging point wire ropes are the same; connecting all the upper hanging point wire ropes to the hook of the crane, and moving the sling to the top of the prefabricated bridge deck to be lifted by the crane; connecting each lower hanging point shackle to the prefabricated bridge deck to be lifted one by one, and controlling the crane to use the sling to move the prefabricated bridge deck to be lifted to the target position and lower it.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:

[0017] By arranging four lifting units 1, with each two lifting units 1 forming a group, into two parallel groups, and the two lifting units 1 in each group are arranged relative to and in parallel, the prefabricated bridge panel lifting assembly composed of the four lifting units 1 can be lifted on the same horizontal plane, which helps to maintain the overall balance. When lifting the prefabricated bridge panel to be lifted, the two ends of the steel wire ropes of the lower lifting points of the two lifting units are respectively passed through the fixed pulley blocks at the two lower lifting point lifting ears, and vertically extended downward, and the pre-embedded lifting points of the prefabricated bridge panel to be lifted are connected in sequence, thereby realizing multi-point lifting, and with the help of the mutual cooperation between the fixed pulley blocks and the steel wire ropes of the lower lifting points, the force of the prefabricated bridge panel to be lifted during the lifting process is more effectively dispersed, so that the tension borne by each pre-embedded lifting point is more uniform, thereby reducing the tensile stress of a single pre-embedded lifting point and its surrounding area. Through this application, the current technical problem of the destruction of the concrete prefabricated bridge panel due to the lifting condition when lifting large-sized concrete prefabricated bridge panels is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the lifting device during lifting in the embodiment of the present application;

[0020] Figure 2 for Figure 1Schematic diagram of the middle sling (without the wire rope at the lower sling point);

[0021] Figure 3 for Figure 2 Schematic diagram of the fixed pulley block;

[0022] Figure 4 for Figure 3 Side view of

[0023] Figure 5 for Figure 2 Front view (with wire rope at lower suspension point);

[0024] Figure 6 for Figure 2 Side view of

[0025] Figure 7 for Figure 1 A top view of

[0026] Figure 8 for Figure 6 A schematic diagram of changing the installation position of the hanging unit 1;

[0027] Fig. 9 for Figure 1 Flow chart of how to use the lifting device.

[0028] In the figure:

[0029] 1. Hoisting unit; 11. Fixed pulley block; 111. Pulley; 1111. Guide groove; 112. Pulley stopper; 113. Pin shaft; 114. Plate; 115. Stiffening rib; 12. Steel wire rope at lower lifting point; 13. Lifting ear at lower lifting point; 131. Ear plate at lower lifting point;

[0030] 2. Longitudinal beam; 21. Lifting lug of the upper hanging point; 22. Shackle of the upper hanging point; 23. Steel wire rope of the upper hanging point;

[0031] 3. The hanging point is connected to the beam;

[0032] 4. Connect the lower hanging point to the beam;

[0033] 5. Prefabricated bridge deck. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The embodiment of the present application provides a precast bridge deck 5 lifting assembly, lifting equipment and use method, which can solve the current technical problem that the precast concrete bridge deck will be damaged due to the lifting conditions when lifting large-sized precast concrete panels.

[0036] In a first aspect, an embodiment of the present application provides a prefabricated bridge deck 5 hoisting assembly.

[0037] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the lifting device during lifting in the embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of the middle lifting device (without the lower lifting point wire rope 12). Figure 1 and Figure 2 As shown, in one embodiment, the prefabricated bridge panel 5 lifting assembly includes four lifting units 1, each two lifting units 1 form a group, which are divided into two parallel groups, and the two lifting units 1 in each group are arranged opposite to and in parallel, each lifting unit 1 includes a fixed pulley block 11, a lower hanging point steel wire rope 12 and two lower hanging point lifting ears 13, a spacing is provided between the two lower hanging point lifting ears 13, and the fixed pulley block 11 is installed on the lower hanging point lifting ears 13, both ends of the lower hanging point steel wire rope 12 respectively pass through the fixed pulley blocks 11 at the two lower hanging point lifting ears 13, and extend vertically downward for connecting the prefabricated bridge panel 5 to be lifted, and the lower hanging point steel wire rope 12 between the two lower hanging point lifting ears 13 is parallel to the horizontal plane.

[0038] In this embodiment, the four hoisting units 1 are divided into two parallel groups. Since there are only four hoisting units 1, two rows and two columns are formed and installed on the same horizontal plane. A spacing is set between the two lower hanging point lifting ears 13 of each hoisting unit 1, and the spacing is determined according to the size of the prefabricated bridge panel 5. The length of the lower hanging point steel wire rope 12 of each hoisting unit 1 is consistent, and the lower hanging point steel wire rope 12 is a flexible component. When the prefabricated bridge panel 5 to be hoisted is hoisted, the lower hanging point steel wire rope 12 will adaptively adjust the drooping length of both ends through the fixed pulley block 11 according to the different stress conditions at both ends. The lower hanging point lifting ears 13 can be made of Q420qD steel.

[0039] In this embodiment, four lifting units 1 are divided into two parallel groups, with two lifting units 1 in each group being arranged opposite and in parallel, so that the lifting assembly of the prefabricated bridge panel 5 composed of four lifting units 1 can be lifted on the same horizontal plane, which helps to maintain the overall balance. When lifting the prefabricated bridge panel 5 to be lifted, the two ends of the lower lifting point wire rope 12 of the two lifting units 1 are respectively passed through the fixed pulley block 11 at the two lower lifting point lifting ears 13, and vertically extended downward, and connected in turn to the embedded lifting points of the prefabricated bridge panel 5 to be lifted, so as to realize multi-point lifting, and with the help of the mutual cooperation between the fixed pulley block 11 and the lower lifting point wire rope 12, the force of the prefabricated bridge panel 5 to be lifted during the lifting process is more effectively dispersed, so that the tension borne by each embedded lifting point is more uniform, and the risk of cracking during the lifting process of the prefabricated bridge panel is effectively avoided. This embodiment solves the current technical problem that when a large-sized prefabricated bridge panel 5 is hoisted, the prefabricated bridge panel 5 is damaged due to the hoisting working condition.

[0040] Further, in one embodiment, referring to Figure 3 , Figure 3 for Figure 2 Schematic diagram of the fixed pulley block 11. Figure 3 As shown, the lower lifting point lug 13 is composed of two lower lifting point lug plates 131, and the fixed pulley block 11 is installed on the inner side of the two lower lifting point lug plates 131. In this embodiment, the lower lifting point lug 13 is composed of two lower lifting point lug plates 131, and a pulley stopper 112 is provided between the fixed pulley block 11 and the two lower lifting point lug plates 131, so that the running track of the fixed pulley block 11 can be more stable during the lifting process, and the possibility of shaking and tilting can be reduced.

[0041] Further, in one embodiment, referring to Figure 3 and Figure 4 , Figure 4 for Figure 3 Side view of the Figure 3 and Figure 4As shown, the fixed pulley block 11 includes a pulley 111, a pulley stopper 112 and a pin 113. The pulley 111 and the pulley stopper 112 are installed on the inner side of the two lower suspension point ear plates 131 through the pin 113, and the pulley stopper 112 is located between the pulley 111 and the lower suspension point ear plates 131. In this embodiment, the fixed pulley block 11 mainly includes three parts including the pulley 111, the pulley stopper 112 and the pin 113. The pulley 111 and the pulley stopper 112 are installed on the inner side of the two lower suspension point ear plates 131 through the pin 113, which can ensure the stable connection between the pulley 111 and the pulley stopper 112 and the lower suspension point ear plates 131, so that the pulley 111 and the pulley stopper 112 are not easy to shake or move after installation. By setting the pulley stopper 112 between the pulley 111 and the lower suspension point ear plate 131, the lateral movement of the pulley 111 on the pin shaft 113 can be limited, which can effectively prevent the pulley 111 from falling off due to excessive force during the lifting process. Among them, the pin shaft 113 is made of 45# steel thick steel bar, and anti-slip structures are added at both ends. The pulley 111 is selected according to the lifting weight of the prefabricated bridge deck 5 and the model of the lower suspension point wire rope 12.

[0042] Further, in one embodiment, if Figure 4 As shown, a plate 114 is welded on both sides of each lower hanging point ear plate 131, and the pin 113 passes through the plate 114. A plurality of stiffening ribs 115 are provided on the outer top of the lower hanging point ear plate 131, and the top surface of the stiffening rib 115 is in the same horizontal plane as the top surface of the lower hanging point ear plate 131. In this embodiment, the plate 114 may be in the shape of an annular plate. By welding an annular plate 114 on both sides of each lower hanging point ear plate 131, and the pin 113 passes through the plate 114, the thickness of the lower hanging point ear plate 131 can be increased, and the bearing capacity can be improved. By arranging a plurality of stiffening ribs 115 on the outer top of the lower suspension point ear plate 131, and the top surface of the stiffening ribs 115 and the top surface of the lower suspension point ear plate 131 are in the same horizontal plane, the stiffening ribs 115 and the lower suspension point ear plate 131 can be fixed at the same position at the same time during the subsequent installation process, so that the connection strength between the lower suspension point and the position can be enhanced, especially when the lower suspension point wire rope 12 is not vertical, resulting in a horizontal force component. The stiffening ribs 115 and the lower suspension point ear plate 131 are connected by welding.

[0043] Further, in one embodiment, if Figure 4As shown, a circle of guide grooves for accommodating the lower suspension point wire rope 12 is provided in the middle of the outer circle of the pulley 111. In this embodiment, by providing a circle of guide grooves for accommodating the lower suspension point wire rope 12 in the middle of the outer circle of the pulley 111, it is possible to ensure that the lower suspension point wire rope 12 always slides along the path set by the guide groove, thereby preventing it from deviating from the track or getting entangled. In addition, the guide groove makes the contact between the lower suspension point wire rope 12 and the pulley 111 more uniform, thereby reducing friction and wear, and extending the service life of the lower suspension point wire rope 12 and the pulley 111.

[0044] In a second aspect, an embodiment of the present application provides a sling.

[0045] Reference Figure 2 , Figure 5 and Figure 6 , Figure 5 for Figure 2 (with lower suspension point wire rope 12) front view; Figure 6 for Figure 2 Side view of the Figure 2 , Figure 5 and Figure 6 As shown, in one embodiment, the prefabricated bridge deck 5 lifting device includes two parallel longitudinal beams 2, two parallel upper hanging point connecting beams 3 and four parallel lower hanging point connecting beams 4 are connected between the two longitudinal beams 2, and the connecting beams and the longitudinal beams 2 are vertically connected; an upper hanging point lifting ear 21 is installed at each end of the top surface of the two longitudinal beams 2, and each upper hanging point connecting beam 3 is located between the two upper hanging point lifting ears 21; the above-mentioned prefabricated bridge deck lifting components are provided on the bottom surfaces of the two longitudinal beams 2, and the two lifting units 1 of each group are respectively installed at the two ends of the two lower hanging point connecting beams 4.

[0046] Among them, the hoist is more suitable for the hoisting of large-size prefabricated bridge decks 5 with a width of 3 to 5 meters, a length of 10 to 20 meters, and a weight of 50 to 120 tons. The longitudinal beam 2, the upper suspension point connecting beam 3, and the lower suspension point connecting beam 4 can all be made of Q345qD steel. The longitudinal beam 2, the upper suspension point connecting beam 3, and the lower suspension point connecting beam 4 can be fixed by welding. The longitudinal beam 2 adopts a box section, which can be processed using a welded section or double-joined H-shaped steel; the upper suspension point connecting beam 3 adopts an H-shaped section, which can be processed using an H-shaped steel or a welded section; the lower suspension point connecting beam 4 adopts a box section with the same height as the longitudinal beam 2 to ensure sufficient bidirectional bending and torsional bearing capacity.

[0047] In addition, it can be seen from the previous embodiments that a prefabricated bridge deck 5 lifting assembly includes four lifting units 1, each two lifting units 1 form a group, which are divided into two parallel groups, and the two lifting units 1 in each group are arranged oppositely and in parallel, and each lifting unit 1 has two lower lifting point ears 13.

[0048] In this embodiment, two parallel upper suspension point connecting beams 3 and four parallel lower suspension point connecting beams 4 are connected between two parallel longitudinal beams 2, and the connecting beams and the longitudinal beams 2 are vertically connected to form a solid overall structure. An upper suspension point lifting lug 21 is installed at each end of the top surface of the two longitudinal beams 2, and each upper suspension point connecting beam 3 is located between two upper suspension point lifting lugs 21, so as to ensure that the crane can better lift the sling through each upper suspension point lifting lug 21, so that it does not tilt during the lifting process. By arranging the above-mentioned prefabricated bridge panel lifting assembly on the bottom surface of the two longitudinal beams 2, and the two lifting units 1 of each group are respectively installed at the two ends of the two lower suspension point connecting beams 4, the force of the prefabricated bridge panel 5 to be lifted during the lifting process can be effectively dispersed, so that the tension borne by each embedded lifting point is more uniform, and the force safety during the lifting process of the prefabricated bridge panel 5 can be ensured.

[0049] Further, in one embodiment, if Figure 2 As shown, the cross-sectional stiffness of the lower hanging point connecting beam 4 is greater than the cross-sectional stiffness of the upper hanging point connecting beam 3. In this embodiment, the upper hanging point connecting beam 3 basically only needs to bear axial force; an H-shaped cross section is adopted, which is an open cross section. The lower hanging point connecting beam 4, because the lower hanging point lifting lug 13 needs to be installed at the bottom of the beam, not only needs to bear axial force, but also needs to bear bidirectional bending moment and torque; a box-type cross section is adopted, which is a closed cross section, and has good bidirectional bending and torsional stiffness. By setting the cross-sectional thickness of the lower hanging point connecting beam 4 to be greater than the cross-sectional thickness of the upper hanging point connecting beam 3, the lower hanging point connecting beam 4 can withstand greater lateral bending and torsional bearing capacity than the upper hanging point connecting beam, and maintain good stability when hoisting the prefabricated bridge deck 5.

[0050] Further, in one embodiment, if Figure 1 As shown, each upper hanging point lifting lug 21 is connected to an upper hanging point shackle 22, and the upper hanging point shackle 22 is connected to an upper hanging point wire rope 23. In this embodiment, the shackle is used as a connecting component. By connecting the upper hanging point shackle 22 to each upper hanging point lifting lug 21 and connecting the upper hanging point wire rope 23 to the upper hanging point shackle 22, the upper hanging point wire rope 23 can be quickly connected and removed, which significantly improves work efficiency. In addition, the combination of the upper hanging point shackle 22 and the upper hanging point wire rope 23 can meet the lifting requirements of prefabricated bridge panels 5 of different weights, shapes and sizes, thereby improving the versatility and adaptability of the lifting operation.

[0051] Further, in one embodiment, referring to Figure 7 , Figure 7 for Figure 1 A top view of the Figure 7As shown, the upper hanging point connects the cross beam 3 and the longitudinal beam 2 to form a rectangle, and each upper hanging point lifting lug 21 is located at the four corners of the rectangle, and the plane direction of the ear plate of the upper hanging point lifting lug 21 is consistent with the force direction of the upper hanging point wire rope 23 when the lifting device is hoisted. In this embodiment, through the above structure, the upper hanging point lifting lug 21 is prevented from being subjected to lateral force, which is convenient for hoisting.

[0052] In other embodiments, the installation section between the upper hanging point ear 21 and the longitudinal beam 2 and the installation section between the lower hanging point ear 13 and the longitudinal beam 2 are both provided with transverse partitions to ensure uniform and reliable force transmission at the connection.

[0053] In some other implementations, reference Figure 8 , Figure 8 for Figure 6 Schematic diagram of changing the installation position of the suspension unit 1. Figure 8 As shown, the lower flanges of the cross section are enlarged at both ends of the lower suspension point connecting cross beam 4, and are processed with welded steel plates to change the fixed position of the hoisting unit 1 at both ends of the lower suspension point connecting cross beam 4, which can meet the hoisting of prefabricated bridge panels 5 of different widths and narrows. In addition, several fixed pulley blocks 11 can be installed on the welded steel plates at both ends of the lower suspension point connecting cross beam 4, and according to the prefabricated bridge panels 5 of different widths and narrows, the appropriate fixed pulley block 11 is selected to hoist the prefabricated bridge panels 5, which has strong adaptability, reduces the number of hoisting tools used, and saves costs.

[0054] In a third aspect, an embodiment of the present application provides a method for using a sling.

[0055] Reference Fig. 9 , Fig. 9 for Figure 1 Flow chart of the use of the lifting device. Fig. 9 As shown, the steps of the method include:

[0056] S10, selecting a lifting device based on the size and lifting weight of the prefabricated bridge deck 5;

[0057] In this embodiment, the hoists are provided with different specifications. According to the sizes and hoisting weights of different prefabricated bridge panels 5, corresponding hoists are selected to ensure successful hoisting.

[0058] S20, the upper hanging point wire rope 23 is connected to the upper hanging point lifting lug 21 through the upper hanging point shackle 22, and the lower hanging point lifting lug 13 is connected to the lower hanging point shackle through the lower hanging point wire rope 12, and the lengths of all the upper hanging point wire ropes 23 and all the lower hanging point wire ropes 12 are consistent.

[0059] In this embodiment, when the sling is used, it is also necessary to use it in combination with the upper suspension point wire rope 23, the upper suspension point shackle 22 and the lower suspension point shackle. First, the upper suspension point wire rope 23 is connected to the upper suspension point lifting lug 21 through the upper suspension point shackle 22, so that the upper suspension point wire rope 23 can be used for hoisting the sling by a crane (such as a crane), and the upper suspension point shackle 22 can quickly connect and remove the upper suspension point wire rope 23 to improve work efficiency. Make the lengths of all the upper suspension point wire ropes 23 consistent, and the lengths of all the lower suspension point wire ropes 12 consistent, so that the balance during the hoisting process can be ensured and the prefabricated bridge deck 5 can be prevented from tilting.

[0060] S30, connecting all the upper hanging point wire ropes 23 to the hook of the crane, and moving the hoist to the top of the prefabricated bridge deck 5 to be hoisted by the crane;

[0061] S40, connecting the shackles of each lower lifting point to the prefabricated bridge panel 5 to be lifted one by one, and controlling the crane to use the lifting device to move the prefabricated bridge panel 5 to be lifted to the target position and lower it.

[0062] In this embodiment, all the upper hanging point steel wire ropes 23 are connected to the hook of the crane, and the crane is used to move the sling to the top of the prefabricated bridge panel 5 to prepare for the lifting. Before lifting, first ensure that there are no other debris on the prefabricated bridge panel 5 to prevent the debris from causing the center of gravity of the entire hoisted object to deviate from the center of the prefabricated bridge panel 5 and become unbalanced during the lifting process. Then, each lower hanging point shackle is connected to each embedded hanging point of the prefabricated bridge panel 5 to be lifted one by one, and the crane is controlled to lift. The prefabricated bridge panel 5 is lifted by the sling to keep it horizontal, and it is slowly moved to the target position and lowered. During this lifting process, pay close attention to whether the sling is tilted and whether the pulley 111 rotates at a large angle. If the above situation occurs, slow down the moving speed, or stop the lifting operation in an emergency.

[0063] In addition, when the temporary storage panels are hoisted, the precast bridge deck 5 must be supported at the target position before the panels are dropped to ensure that the precast bridge deck 5 can be safely stressed.

[0064] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0065] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0066] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A prefabricated bridge deck hoisting assembly, characterized in that: include: Four lifting units (1), each two lifting units (1) form a group, and are divided into two parallel groups, and the two lifting units (1) in each group are arranged oppositely and in parallel, each lifting unit (1) comprises a fixed pulley block (11), a lower lifting point steel wire rope (12) and two lower lifting point lifting ears (13), a spacing is provided between the two lower lifting point lifting ears (13), and the fixed pulley block (11) is installed on the lower lifting point lifting ears (13), two ends of the lower lifting point steel wire rope (12) respectively pass through the fixed pulley block (11) at the two lower lifting point lifting ears (13), and extend vertically downward for connecting the prefabricated bridge deck to be lifted, and the lower lifting point steel wire rope (12) between the two lower lifting point lifting ears (13) is parallel to the horizontal plane.

2. The prefabricated bridge deck hoisting assembly according to claim 1, characterized in that: The lower suspension point lifting lug (13) is composed of two lower suspension point lug plates (131), and the fixed pulley block (11) is installed on the inner sides of the two lower suspension point lug plates (131).

3. The prefabricated bridge deck hoisting assembly according to claim 2, characterized in that: The fixed pulley block (11) comprises a pulley (111), a pulley stopper (112) and a pin shaft (113); the pulley (111) and the pulley stopper (112) are mounted on the inner sides of two lower suspension point ear plates (131) via the pin shaft (113); and the pulley stopper (112) is located between the pulley (111) and the lower suspension point ear plates (131).

4. The prefabricated bridge deck hoisting assembly according to claim 3, characterized in that: A plate (114) is welded to both sides of each lower hanging point ear plate (131), and the pin shaft (113) passes through the plate (114). A plurality of stiffening ribs (115) are provided on the outer top of the lower hanging point ear plate (131), and the top surface of the stiffening ribs (115) is in the same horizontal plane as the top surface of the lower hanging point ear plate (131).

5. The prefabricated bridge deck hoisting assembly according to claim 3, characterized in that: A guide groove (1111) for accommodating the lower suspension point steel wire rope (12) is provided in the middle of the outer circle of the pulley (111).

6. A sling, characterized in that: It comprises two longitudinal beams (2) arranged in parallel, two upper suspension point connecting beams (3) arranged in parallel and four lower suspension point connecting beams (4) arranged in parallel are connected between the two longitudinal beams (2), and the connecting beams and the longitudinal beams (2) are vertically connected; A lifting lug (21) is installed at each end of the top surface of the two longitudinal beams (2), and each of the lifting lugs (3) connected to the lifting point is located between the two lifting lugs (21); The bottom surfaces of the two longitudinal beams (2) are provided with the prefabricated bridge deck hoisting assembly as described in any one of claims 1 to 5, and the two hoisting units (1) of each group are respectively installed at the two ends of the cross beam (4) connected by two lower hanging points.

7. The sling according to claim 6, characterized in that: The cross-sectional rigidity of the lower suspension point connecting cross-beam (4) is greater than the cross-sectional rigidity of the upper suspension point connecting cross-beam (3).

8. The sling according to claim 6, characterized in that: Each of the upper hanging point lifting ears (21) is connected to an upper hanging point shackle (22), and the upper hanging point shackle (22) is connected to an upper hanging point steel wire rope (23).

9. The sling according to claim 7, characterized in that: The upper suspension point connects the cross beam (3) and the longitudinal beam (2) to form a rectangle, each of the upper suspension point lifting ears (21) is located at the four corners of the rectangle, and the plane direction of the ear plate of the upper suspension point lifting ear (21) is consistent with the force direction of the upper suspension point wire rope during lifting.

10. A method for using the sling according to claim 6, characterized in that the steps include: Selecting a lifting device based on the size and lifting weight of the prefabricated bridge deck (5); The upper hanging point wire rope (23) is connected to the upper hanging point lifting lug (21) through the upper hanging point shackle (22), and the lower hanging point lifting lug (13) is connected to the lower hanging point shackle through the lower hanging point wire rope (12), and the lengths of all the upper hanging point wire ropes (23) and all the lower hanging point wire ropes (12) are consistent; Connect all the upper hanging point wire ropes (23) to the hook of the crane, and move the hoisting device to the top of the prefabricated bridge deck (5) to be hoisted by the crane; The shackles at each lower lifting point are connected one by one to the prefabricated bridge deck (5) to be lifted, and the crane is controlled to use the lifting device to move the prefabricated bridge deck (5) to be lifted to a target position and lower it.

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