Dual-machine collaborative hoisting system and method for a highway bridge over a deep cutting of a railway under construction

Abstract

The invention relates to a double-machine cooperative lifting system and method for a highway bridge over a railway deep cutting under construction. A crane A (2) and a crane B (3) are provided at a bridge site lifting area, a beam yard is provided next to the bridge site, and a gun carriage for transporting a beam member (1) to the lifting area is provided between the beam yard and the bridge site; an A lifting point (9) corresponding to the crane A (2) and a B lifting point (10) corresponding to the crane B (3) are provided at both ends of the beam member (1); an intermediate span (5) is provided in the middle of a bridge pier (4), and side spans (6) are provided at both ends of the intermediate span (5); the cutting top of the side span (6) is provided as a bridge upper work station (8), and when installing a beam body (1) of the side span (6), a side slope platform is provided as a conversion work station (7) in the middle; the invention has a reasonable design, a compact structure and is convenient to use.

Description

Technical Field

[0001] The invention relates to a dual-machine cooperative hoisting system and method for a highway bridge crossing a deep cutting of a railway under construction. Background Art

[0002] The common implementation method for the three-dimensional intersection project between the newly built railway cutting section and the existing low-grade highway is to interrupt the existing highway, and after the main railway cutting project is completed, build a highway bridge over the railway cutting to restore the existing highway project. The hoisting of the highway bridge over the deep cutting of the railway under construction is difficult and has high safety risks due to the small crane travel area, limited boom operation space, and high hoisting distance and height requirements. At present, no relevant research has been reported. Some scholars have studied the hoisting technology of the highway bridge over the existing railway. Ma Xuemei studied the hoisting construction parameters, crane load rate under various working conditions, and construction quality control measures of the steel cap beam over the Beijing-Shanghai High-Speed ​​Railway; Gu Lanyu studied the sequence and operation process of the single-machine hoisting and double-machine hoisting of the elevated bridge over the railway operating line based on engineering examples; Wang Yunan studied the crane selection and hoisting sequence of the elevated box girder bridge over the line under complex hoisting conditions in view of the complex traffic in the construction area and the limited construction scope of the elevated box girder bridge over the line. Summary of the invention

[0003] The technical problem to be solved by the present invention is generally to provide a dual-machine collaborative lifting system and method for a highway bridge over a deep railway cutting under construction. The present invention proposes a dual-machine collaborative step-by-step lifting method and a dual-machine collaborative one-time lifting method, which are respectively used for the lifting of the side span and middle span beams of a highway bridge over a deep railway cutting under construction. By setting a beam body modification: lifting point conversion station, through a series of operation links such as aerial hook replacement, crane station transfer and modification: lifting point conversion, the long-distance and high-height lifting and lifting of the side span box beam is realized. The main construction parameters are studied and the safety of crane lifting is analyzed.

[0004] To solve the above problems, the technical solution adopted by the present invention is:

[0005] A method for coordinating the lifting of a highway bridge with a deep cutting over a railway under construction by means of a coordinating lifting system of a highway bridge with a deep cutting over a railway under construction; the method comprises the following steps:

[0006] Step 1: Execute the side span box girder hoisting plan;

[0007] Step 1. First, both crane A and crane B are located on the roadbed and their positions are determined according to the working conditions and crane performance parameters. Then, the lifting auxiliary device is installed on the beam. Next, crane A and crane B are respectively hooked to the A lifting point and the B lifting point of the beam body, wherein the steel wire rope of crane B is connected to the mobile lifting lug seat at the B lifting point, and a trial lifting is performed. After confirming safety and stability, the lifting is started, and the angle between the monitoring side vertical frame and the monitoring swing rod is observed to realize the observation of the beam body (1) and determine whether it is lifted correctly.

[0008] Step 1 and 2: First, crane A and crane B lift the beam and then rotate it to the direction of the bridge; then, the two cranes work together to lift the beam to the transfer station, and place one end of the beam steadily on the temporary support point set on the slope platform of the road cut; secondly, the lifting eye seat is moved to the A lifting point and blocked by the transverse stop rod at the end of the lifting eye, so that the crane B hook is hung at the A lifting point;

[0009] Step 1-3: First, crane A is transferred to the hoisting station on the top of the cutting; then, the auxiliary rotating shaft drives the auxiliary swing arm to swing upward, and at the same time, the inertia force is used to send the end of the auxiliary hanging rope to the hoisting station on the top of the cutting; secondly, crane A hooks the auxiliary hanging rope, and after the beam reaches the side span position, the beam is dropped to complete the hoisting.

[0010] A double-machine cooperative lifting system for a highway bridge over a deep cutting of a railway under construction comprises a crane A, a crane B and a lifting auxiliary device for installation on a beam; and lifting points A and B are provided at both ends of the lifting auxiliary device.

[0011] As a further improvement of the above technical solution:

[0012] Lifting auxiliary devices include:

[0013] A supporting device, used for being sleeved on the beam member;

[0014] Balance monitoring device, used to monitor whether the beam is level during lifting;

[0015] Process base, used to support beams for easy installation;

[0016] Mobile lifting lug device, used to change the position of the lifting suspension.

[0017] The support device comprises two side support frames and an intermediate support frame between the two side support frames; the two side support frames and the intermediate support frame are connected as a whole through a side connecting rod; a side center notch corresponding to the beam member is provided on the side support frame and the intermediate support frame; a side stopper for placing the beam member to slide out longitudinally is installed on the side center notch of the side support frame through bolts, and a side fixing hanging ring is provided on both the side support frames and the intermediate support frame;

[0018] The balance monitoring device comprises a monitoring lifting guide frame vertically mounted on a supporting device; a monitoring hinge shaft is lifted and lowered in the monitoring lifting guide frame, a monitoring lower pressure head is provided at the lower end of the monitoring hinge shaft for pressing on the upper surface of the beam, a monitoring side vertical frame is vertically provided on one side of the monitoring lower pressure head, a monitoring horizontal vertical cross bar is vertically provided on the monitoring side vertical frame, and a monitoring swing bar is swingably provided at the lower end of the monitoring horizontal vertical cross bar; a vertical marking line is provided on the monitoring side vertical frame, and whether the beam is horizontal can be judged by observing the swing of the monitoring swing bar relative to the vertical marking line;

[0019] The movable lifting lug device comprises a lifting lug longitudinal movable frame longitudinally arranged on the supporting device; the A lifting point and the B lifting point are arranged at two ends of the lifting lug longitudinal movable frame; a movable lifting lug seat is longitudinally moved by a push rod on the lifting lug longitudinal movable frame;

[0020] A lifting eye B end limit block is provided at the B lifting point, and a lifting eye B end transverse stop bar for blocking the movement of the movable lifting eye seat is provided at the output end of the lifting eye B end limit block;

[0021] The structure of the A lifting point is the same as that of the B lifting point; a transverse stop bar at the A end of the lifting eye for blocking the movement of the movable lifting eye seat is arranged at the output end of the A lifting point.

[0022] The auxiliary lifting device comprises an auxiliary bracket arranged on the supporting device, on which an auxiliary rotating shaft driven by a motor is arranged, and an auxiliary swing arm driven by the auxiliary rotating shaft swings, and an auxiliary hanging rope is swingingly connected under the auxiliary swing arm.

[0023] The invention has reasonable design, low cost, durability, safety and reliability, simple operation, time and labor saving, money saving, compact structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the construction situation of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the present invention.

[0026] Figure 3 This is a schematic diagram of the side span construction of the present invention. Figure 1 .

[0027] Figure 4 This is a schematic diagram of the side span construction of the present invention. Figure 2 .

[0028] Figure 5 This is a schematic diagram of the side span construction of the present invention. Figure 3 .

[0029] Figure 6 This is a schematic diagram of the side span construction of the present invention. Figure 4 .

[0030] Figure 7 It is a schematic diagram of the mid-span construction of the present invention.

[0031] Figure 8 It is a hoisting schematic diagram of the present invention.

[0032] Fig. 9 It is a schematic diagram of the lifting structure of the present invention.

[0033] Fig.10 It is a schematic diagram of the crane structure of the present invention.

[0034] Fig.11 It is a schematic diagram of the auxiliary structure of the present invention.

[0035] Fig.12 It is a partial schematic diagram of the auxiliary structure of the present invention. Figure 1 .

[0036] Fig.13 It is a partial schematic diagram of the auxiliary structure of the present invention. Figure 2 .

[0037] Fig.14 This is a partial schematic diagram of the auxiliary structure of the present invention. Figure 3 .

[0038] Fig.15 This is a construction diagram of the present invention. Figure 1 .

[0039] Fig.16 This is a construction diagram of the present invention. Figure 2 .

[0040] Among them: 1. Beam; 2. Crane A; 3. Crane B; 4. Pier; 5. Middle span; 6. Side span; 7. Transfer station; 8. Upper station of bridge; 9. A lifting point; 10. B lifting point; 11. Lifting auxiliary device; 12. Support device; 13. Balance monitoring device; 14. Process base; 15. Mobile lifting lug device; 16. Auxiliary lifting device; 17. Side support frame; 18. Side connecting rod; 19. Side center notch; 20. Side block; 21. Side fixing Fixed hanging ring; 22. Intermediate support frame; 23. Monitoring lifting guide frame; 24. Monitoring hinge shaft; 25. Monitoring down-pressure head; 26. Monitoring side vertical frame; 27. Monitoring horizontal vertical crossbar; 28. Monitoring swing bar; 29. ​​Lifting ear longitudinal moving frame; 30. Lifting ear B end limit block; 31. Moving lifting ear seat; 32. Lifting ear B end horizontal stop bar; 33. Lifting ear A end horizontal stop bar; 34. Auxiliary bracket; 35. Auxiliary rotating shaft; 36. Auxiliary swing arm; 37. Auxiliary hanging rope. DETAILED DESCRIPTION

[0041] like Figure 1-16, Example, the existing road on the side of XX Village, XX District, XX City, intersects with the XX Railway at DK169+475. The overview of the bridge site is as follows Figure 1 As shown. The upper highway bridge is a simple-supported and then continuous prestressed reinforced concrete continuous box girder bridge, with a span of 3×20m and an angle of 120° between the bridge axis and the right front of the railway. The bridge is 7m wide, with two box girders arranged transversely in each span, with a beam width of 3.1m and a pier height of 12m. The layout of the highway bridge is shown in Figure 2 A beam yard is set up on the left side of the railway DK169+600 line, and beams are transported to the bridge site for erection via a beam transport path.

[0042] There are technical problems: (1) The lifting distance and height requirements are high. The bridge is located in a deep road cutting, with a slope height of 14m and a lateral distance of 16m from the slope foot to the abutment support. Therefore, the maximum lifting distance and height are 25.0m and 20.6m respectively. (2) The crane travel area is small. The roadbed width at the bridge site is only 10m, and the two bridge piers are arranged within the roadbed surface. The highway bridge and the railway are at a small angle, and the area available for the crane to travel is narrow. (3) The risk of collision during the crane operation process is high. Since the crane is operating in a deep road cutting and there are bridge piers within the operating range, and the double-machine lifting process requires coordinated operations such as beam body rotation, aerial hook replacement, and work station conversion, there is a high risk of collision between the boom and the bridge piers, the beam, and the crane boom. Commonly used methods for erecting simply supported box girders include the bridge erection machine method, cast-in-place method, and hoisting method. The bridge erection machine method is suitable for erecting box girders with a large number of spans. This project has a small number of spans, only three, and the transportation at the hoisting site is inconvenient. If a bridge crane is used for construction, it is necessary to build a construction access road and an assembly platform. In addition, the assembly and disassembly of the bridge crane requires the cooperation of a large-tonnage crane and a large number of professionals, and the project cost is relatively high. The cast-in-place construction method has a large amount of on-site work, and there are cross-operations with slope protection and drainage projects, which also affects the development of subsequent processes and makes it difficult to guarantee the construction period. The crane hoisting method has a small amount of on-site work and has little impact on the construction of the railway project under construction; through parallel operations, the highway can be opened as soon as possible, with little impact on local traffic. Therefore, this project adopts a crane hoisting solution, and the lifting equipment uses an all-terrain truck crane.

[0043] Specific plan content:

[0044] Lifting sequence:

[0045] As the side span hoisting is restricted by the slope of the road cut, the hoisting is difficult. In order to avoid the influence of the middle span, the hoisting sequence of the side span first and the middle span is generally adopted, that is, the side span box girder at one end is hoisted first, then the side span box girder at the other end, and finally the middle span box girder. For each span, it is hoisted from one side in sequence.

[0046] Step 1: Execute the side span box girder hoisting plan;

[0047] The difficulty in lifting the side span box girder lies in the lateral distance from the slope foot to the abutment of 16m and the vertical height of 14m. If it is lifted in one go, the operating radius of the crane must be at least 25m, and at the same time it must meet the lifting weight requirements, which places high demands on the technical performance of the crane and poses great safety risks.

[0048] Therefore, in order to ensure the safety of lifting and reduce construction costs, a double-machine collaborative step-by-step lifting method was proposed, that is, the turret transports the beam to the lifting area, and first uses two cranes located on the roadbed to lift the box beam, and uses the slope platform as the conversion station to carry out the change: lifting point conversion; then, one of the cranes is transferred to the top of the cutting, and the top of the cutting crane and the roadbed crane cooperate to lift the beam into place.

[0049] Step 2: Execute the lifting plan of the mid-span box girder;

[0050] The middle span box girder adopts the method of double-machine coordinated one-time lifting into place, that is, the beam is transported to the lifting area by a gun carriage, and after the two cranes are in position on the railway roadbed, the double-machine lifting box girder is lifted into place in one go and the beam is lowered to complete the lifting.

[0051] Specific lifting process

[0052] In step 1, the side span box girder hoisting process

[0053] The side span box girder is hoisted by a dual-machine collaborative step-by-step lifting method. The process principle is as follows: the box girder is transported to the hoisting area by a beam transport vehicle. Both cranes A and B are located on the roadbed and their positions are determined according to the operating conditions and crane performance parameters. Cranes A and B respectively hook the left and right ends of the box girder for trial lifting. After confirming safety and stability, they start hoisting. After lifting the box girder, the dual machines rotate in the direction of the bridge. The dual machines work together to lift the box girder to the height of the slope platform and place one end of the box girder stably on a temporary support point set on the slope platform of the road cut. Crane B unhooks and hooks it to the left end of the beam. Crane A unhooks and retracts the vehicle, moves to the hoisting station on the top of the cut, and hooks it to the right end of the beam. The dual machines work together to lift the box girder again, and after reaching the installation position, they drop the beam to complete the hoisting. The hoisting construction process is as follows: Fig.15 The hoisting process is as follows. Fig.16 shown.

[0054] In step 2, the process flow of hoisting the mid-span box girder

[0055] The middle span box girder is hoisted by the method of double-machine coordinated one-time hoisting. The process principle is as follows: the box girder is transported to the hoisting area by a beam transport vehicle. The two cranes A and B are both located on the roadbed and their positions are determined according to the operating conditions and crane performance parameters. Cranes A and B hook the left and right ends of the box girder respectively for trial hoisting. After confirming safety and stability, hoisting begins. After the double machines lift the box girder, they rotate in the direction of the bridge. The double machines work together to lift the box girder to the installation position and drop the beam to complete the hoisting. The hoisting construction process is as follows: Fig.15The hoisting process is as follows. Fig.16 shown.

[0056] Study on main construction parameters

[0057] The preset box girder is a simply supported component. In order to ensure that the force points and force state of the box girder during the lifting process are consistent with its use, parallel lifting and two-point lifting are adopted to ensure the box girder lifting process: balanced force at the lifting points and stability when lifting and lowering the beam.

[0058] The distance between the lifting point and the two ends of the object is calculated based on the moment balance of the box beam itself, that is, to ensure that the positive and negative bending moments at the lifting point are equal. Therefore, the two lifting points are set at 0.2L from the beam end. Fig.15 As shown. The lifting point adopts wire rope binding hoisting style. The weight of each box girder in this project is 62.0t. Under the condition of double lifting, the theoretical bearing capacity of the two lifting points is 31.0t.

[0059] The purpose of crane selection is to determine the specific model of the crane according to the lifting task, so that the crane's operating radius, lifting height, lifting weight and other parameters meet the requirements of the operating conditions. This project uses dual cranes for lifting, and the cranes should be of the same model as much as possible. If the two cranes are of different models, they should be selected with similar working speeds as much as possible to facilitate coordinated operation.

[0060] First, determine the calculated load G of the object to be hoisted j

[0061] G j =K1×K2×G0 (1)

[0062] In the formula, G0 is the sum of the weight of the object being hoisted, the lifting lugs and the weight of the rigging (t), which is taken as 33.0t; K1 is the dynamic load coefficient, which is taken as 1.1; K2 is the unbalanced coefficient of the double crane lifting, which is taken as 1.2. The calculation results show that G j =43.6t.

[0063] Then, according to the crane parameter performance table, select the rated lifting capacity Q ≥ G j . Under the premise of meeting the lifting weight requirements, the boom length L and working radius R are selected according to the lifting height H and site conditions. According to the lifting process, the operating radius and lifting height of each crane are calculated under different working conditions, and the performance tables of cranes of different tonnages are consulted for comparative analysis. Under the premise of meeting the lifting weight requirements, considering the economic factors, crane A uses the QAY200 crane and crane B uses the QAY300 crane.

[0064] Wire Rope Selection

[0065] The selection of wire ropes must meet the relevant requirements of the literature. The standard for the use of thick diameter wire ropes is

[0066]

[0067] In the formula, Dmin is the minimum diameter of the hoisting wire rope (mm); Q is the weight that the crane sling bears (t); β is the load distribution coefficient, which is generally taken as 66%. Considering the unbalanced coefficient K of the double-machine lifting, which is generally taken as 1.2, the weight that each crane sling bears under the double-machine lifting condition is Q = 31.0 × 1.2 = 37.2t. According to formula (2), it can be calculated that Dmin = 37.0mm should be achieved.

[0068] The force FN of a single-strand wire rope on one side is calculated as follows:

[0069]

[0070] Where: 1.05 is the angle coefficient, Q is the weight of the crane sling (t), which is 37.2t. The calculation shows that FN = 9.8t.

[0071] Total pulling force Z n = k·F N (4)

[0072] In the formula, k is the safety factor of the hoisting wire rope, which is 8. The calculation results show that Zn = 768.3kNZ. The wire rope is made of fiber core, so its breaking force needs to be converted. The conversion formula is,

[0073]

[0074] Where α is the conversion coefficient and is taken as 1.226, the breaking tension of the wire rope is Z = 626.7 kN;

[0075] Where, Z is the breaking force (kN); FC is the tensile strength of the wire rope, which is 1670kg / mm2. It is calculated that D = 36.0mm.

[0076] After the above analysis and calculation, the steel wire rope selected is Φ37-6×37zs+FC-1670.

[0077] 4.4 Bearing capacity of outrigger foundation

[0078] From the lifting plan, it can be seen that the load-bearing capacity of cranes A and B is equal. The total load-bearing capacity N of the foundation of a single crane is calculated as follows:

[0079]

[0080] In the formula, γG and γQ are the static and dynamic load combination coefficients, which are 1.2 and 1.4 respectively; G0 is the sum of the weight of the crane, the superlifting counterweight, the sling and the rigging weight (kN), for crane A, G0 = 1360kN, for crane B, G0 = 1520kN. Calculate according to the latter; GL is the weight of the box beam, which is 303.8kN. It can be calculated that the total load-bearing N = 2322kN.

[0081] Assuming that the four outriggers of the crane are evenly stressed, the average compressive stress applied by each outrigger on the foundation is

[0082]

[0083] In the formula, A is the area of ​​the crane outrigger steel pad, and the outrigger pad is made of 2.5m×3.0m×0.05m steel plate. It can be calculated that p=77.4kPa.

[0084] Considering the construction of beams across the railway, a safety factor of 1.2 is taken, and the required bearing capacity of the foundation is f a ≥1.2P=92.9kPa. If the bearing capacity of the on-site foundation does not meet the above requirements, compaction or replacement can be used.

[0085] 5. Lifting safety analysis

[0086] In order to ensure the stability of the crane during the lifting process, it is necessary to analyze the anti-overturning stability of the crane. According to the literature [9], the anti-overturning stability standard of the crane is

[0087] ∑M=K G ·M G +K Q ·M Q +K W ·M W ≥0 (9)

[0088] In the formula, ∑ M is the anti-overturning moment, K G is the weighted coefficient of self-weight, which is 1; K Q K is the weighted coefficient of lifting load, which is 1.15; W is the wind load weighting coefficient, which is 1; M G 、M Q 、M W The moments of the crane's deadweight, lifting load and wind load on the overturning edge are shown in the figure. The crane's working force diagram is shown in the figure.

[0089] In the figure, 8, G is the deadweight of the crane (kN);

[0090] Q——weight of lifting object (kN);

[0091] W——wind load (kN), 20% of the weight of the lifting object

[0092] consider

[0093] a——the distance from the center of gravity of the crane to the tipping fulcrum of the outrigger (m);

[0094] R——crane operating radius (m);

[0095] h – height of the resultant point of wind load (m).

[0096] QAY300 crane G = 179t, a = 5.85m, under the most unfavorable working condition R = 25m, Q = 33t, W = 6.6t, the wind load resultant point is

[0097] The center of gravity of the hanging object, h = 16.3m, can be calculated

[0098] ∑ M =212.8kNm>0, meets the requirements.

[0099] Similarly, for QAY200 crane,

[0100] ∑ M =449.4kNm>0, meets the requirements.

[0101] The effects of the present invention are as follows: (1) It is advisable to adopt a crane lifting solution for lifting the box girder of a highway bridge over a deep cutting of a railway under construction. (2) The dual-machine collaborative step-by-step lifting method can solve the problem of long-distance and high-height lifting of the side span box girder of a highway bridge over a deep cutting of a railway under construction. (3) Selecting QAY200 and QAY300 cranes, Φ37-6×37zs+FC-1670 steel wire rope can meet the lifting capacity requirements. The bearing capacity of the foundation needs to reach 92.9kPa. (4) The anti-overturning stability of the crane meets the requirements and can ensure the safety of construction. (5) Practice has proved that the dual-machine collaborative lifting technology method for the box girder of a highway bridge over a deep cutting of a railway under construction is novel, practical, safe and reliable, and has a good application effect.

[0102] like Figure 1 As shown, the dual-machine cooperative lifting system of the highway bridge over the deep cutting of the railway under construction in this embodiment includes a crane A2, a crane B3 and a lifting auxiliary device 11 for installation on the beam 1; there are A lifting point 9 and B lifting point 10 at both ends of the lifting auxiliary device 11.

[0103] The lifting auxiliary device 11 comprises:

[0104] A supporting device 12, used for being sleeved on the beam 1;

[0105] A balance monitoring device 13 is used to monitor whether the beam 1 is level during the lifting process;

[0106] A process base 14, used to support the beam 1 to facilitate installation;

[0107] The movable lifting lug device 15 is used to change the position of the lifting suspension.

[0108] The support device 12 includes two side support frames 17 and an intermediate support frame 22 between the two side support frames 17; the two side support frames 17 and the intermediate support frame 22 are connected as a whole through a side connecting rod 18; a side center notch 19 corresponding to the beam 1 is provided on the side support frame 17 and the intermediate support frame 22; a side stopper 20 for placing the beam 1 to slide out longitudinally is installed on the side center notch 19 of the side support frame 17 through bolts, and a side fixing ring 21 is provided on both the two side support frames 17 and the intermediate support frame 22;

[0109] The balance monitoring device 13 comprises a monitoring lifting guide frame 23 vertically mounted on the supporting device 12; a monitoring hinge shaft 24 is lifted and lowered in the monitoring lifting guide frame 23, a monitoring lower pressure head 25 for pressing on the upper surface of the beam 1 is arranged at the lower end of the monitoring hinge shaft 24, a monitoring side vertical frame 26 is vertically arranged on one side of the monitoring lower pressure head 25, a monitoring horizontal vertical cross bar 27 is vertically arranged on the monitoring side vertical frame 26, and a monitoring swing bar 28 is swingably arranged at the lower end of the monitoring horizontal vertical cross bar 27; a vertical marking line is arranged on the monitoring side vertical frame 26, and whether the beam 1 is horizontal can be judged by observing the swing of the monitoring swing bar 28 relative to the vertical marking line;

[0110] The movable lifting lug device 15 comprises a lifting lug longitudinal movable frame 29 longitudinally arranged on the supporting device 12; the A lifting point 9 and the B lifting point 10 are arranged at both ends of the lifting lug longitudinal movable frame 29; and a movable lifting lug seat 31 is longitudinally moved on the lifting lug longitudinal movable frame 29 driven by a push rod;

[0111] A lifting eye B end limit block 30 is provided at the B lifting point 10, and a lifting eye B end transverse stop bar 32 for blocking the movement of the movable lifting eye seat 31 is provided at the output end of the lifting eye B end limit block 30;

[0112] The A lifting point 9 has the same structure as the B lifting point 10 ; a transverse stop bar 33 at the end of the lifting eye A is provided at the output end of the A lifting point 9 for blocking the movement of the movable lifting eye seat 31 .

[0113] The auxiliary lifting device 16 includes an auxiliary bracket 34 arranged on the supporting device 12, on which is arranged an auxiliary shaft 35 driven by a motor, an auxiliary swing arm 36 driven by the auxiliary shaft 35 to swing, and an auxiliary hanging rope 37 is swingingly connected under the auxiliary swing arm 36.

[0114] The double-machine cooperative hoisting method for a highway bridge with a deep cutting over a railway under construction in this embodiment is based on a double-machine cooperative hoisting system for a highway bridge with a deep cutting over a railway under construction; the method comprises the following steps:

[0115] Step 1: Execute the side span box girder hoisting plan;

[0116] Step 1. First, both crane A2 and crane B3 are located on the roadbed and determine their positions according to the operating conditions and crane performance parameters. Then, the lifting auxiliary device 11 is installed on the beam 1. Secondly, crane A2 and crane B3 respectively hook the A lifting point 9 and B lifting point 10 of the beam 1, wherein the steel wire rope of crane B3 is connected to the movable lifting lug seat 31 at the B lifting point 10, and a trial lift is carried out. After confirming that it is safe and stable, the lifting is started, and the angle between the monitoring side vertical frame 26 and the monitoring swing rod 28 is observed to realize the observation of the beam 1 and determine whether it is lifted correctly.

[0117] Step 1 and 2: First, crane A2 and crane B3 lift beam 1 and then rotate it to the direction of the bridge; then, the two cranes work together to lift beam 1 to the conversion station 7, and place one end of beam 1 stably on a temporary support point set on the slope platform of the road cut; secondly, the lifting lug seat 31 is moved to the A lifting point 9 and blocked by the transverse stopper 33 at the end of the lifting lug A, so that crane B3 is hooked at the A lifting point 9;

[0118] Step 1-3, first, crane A2 is transferred to the hoisting station on the top of the cutting; then, the auxiliary rotating shaft 35 drives the auxiliary swing arm 36 to swing upward, and at the same time, using the inertia force, the end of the auxiliary hanging rope 37 is sent to the hoisting station on the top of the cutting; secondly, crane A2 hooks the auxiliary hanging rope 37, and after the beam 1 reaches the side span 6 position, the beam is dropped to complete the hoisting.

[0119] The present invention realizes the construction of the beam 1 based on the crane A2 and the crane B3, and ingeniously realizes the automatic change of the lifting point, realizes the installation of the middle span 5 and the side span 6, and realizes the intermediate buffer adjustment position through the ingenious design of the conversion station 7, and realizes the pulling into place at the bridge upper station 8, and realizes the lifting at the A lifting point 9 and the B lifting point 10. The lifting auxiliary device 11 is the invention point, which realizes the support of the beam body and avoids the sinking and deformation of the beam body caused by the traditional lifting, so that the support device 12 frame has good versatility and adjustable length, and its force is arranged to avoid deformation, and the balance monitoring device 13 can utilize the swing , realizing intuitive observation of the angle with the naked eye, the process base 14 is convenient for off-ground support and easy to assemble, the movable lifting ear device 15 realizes the position adjustment of the lifting wire rope, and the auxiliary lifting device 16 realizes automatic swing to avoid manual hook replacement, which can be circuit-controlled or battery-controlled, and the monitoring lifting guide frame 23 realizes guidance, and the monitoring articulated shaft 24 has good compatibility, so that the monitoring lower pressure head 25 is pressed on the upper surface of the beam body, thereby realizing the verticality of the monitoring side vertical frame 26, and the monitoring swing rod 28 (always in a vertical state) swinging on the monitoring horizontal vertical cross bar 27 is used to realize the vertical and vertical angle adjustment.

Claims

1. A method for the coordinated lifting of a highway bridge with two machines over a deep cutting of a railway under construction. Features: With the help of a system; the system includes a crane A (2), a crane B (3) and a lifting auxiliary device (11) for installation on a beam member (1); the lifting auxiliary device (11) has a lifting point A (9) and a lifting point B (10) at both ends; the lifting auxiliary device (11) includes: A supporting device (12) used for being sleeved on the beam member (1); A balance monitoring device (13) is used to monitor whether the beam (1) is level during the lifting process; A process base (14) for supporting the beam (1) to facilitate installation; Moving the lifting lug device (15) for changing the position of the hanging hoist; The support device (12) comprises two side support frames (17) and an intermediate support frame (22) between the two side support frames (17); the two side support frames (17) and the intermediate support frame (22) are connected as a whole via a side connecting rod (18); a side center notch (19) corresponding to the beam member (1) is provided on the side support frame (17) and the intermediate support frame (22); a side stopper (20) for placing the beam member (1) to slide out longitudinally is installed on the side center notch (19) of the side support frame (17) via bolts, and a side fixing hanging ring (21) is provided on both the two side support frames (17) and the intermediate support frame (22); The balance monitoring device (13) comprises a monitoring lifting guide frame (23) vertically mounted on a supporting device (12); a monitoring hinge shaft (24) is lifted and lowered in the monitoring lifting guide frame (23); a monitoring lower pressure head (25) for pressing on the upper surface of the beam member (1) is provided at the lower end of the monitoring hinge shaft (24); a monitoring side vertical frame (26) is vertically provided on one side of the monitoring lower pressure head (25); a monitoring horizontal vertical cross bar (27) is vertically provided on the monitoring side vertical frame (26); a monitoring swing bar (28) is swingably provided at the lower end of the monitoring horizontal vertical cross bar (27); a vertical marking line is provided on the monitoring side vertical frame (26); and whether the beam member (1) is horizontal can be judged by observing the swing of the monitoring swing bar (28) relative to the vertical marking line; The movable lifting lug device (15) comprises a lifting lug longitudinal movable frame (29) longitudinally arranged on the supporting device (12); a lifting point A (9) and a lifting point B (10) are arranged at two ends of the lifting lug longitudinal movable frame (29); and a movable lifting lug seat (31) is provided on the lifting lug longitudinal movable frame (29) and is driven by a push rod to move longitudinally; A lifting eye B end limit block (30) is provided at the B lifting point (10), and a lifting eye B end transverse stop rod (32) for blocking the movement of the movable lifting eye seat (31) is provided at the output end of the lifting eye B end limit block (30); The A lifting point (9) and the B lifting point (10) have the same structure; a lifting eye A end transverse stop rod (33) for blocking the movement of the movable lifting eye seat (31) is provided at the output end of the A lifting point (9); the auxiliary lifting device (16) comprises an auxiliary bracket (34) provided on the supporting device (12); an auxiliary rotating shaft (35) driven by a motor is provided on the auxiliary bracket (34); an auxiliary swing arm (36) driven by the auxiliary rotating shaft (35) to swing; an auxiliary hanging rope (37) is swingably connected under the auxiliary swing arm (36); The method comprises the following steps: Step 1: Execute the side span box girder hoisting plan; Step 1. First, both crane A (2) and crane B (3) are located on the roadbed and their positions are determined according to the working conditions and crane performance parameters. Then, the lifting auxiliary device (11) is installed on the beam (1). Next, crane A (2) and crane B (3) are hooked to the A lifting point (9) and B lifting point (10) of the beam (1) respectively, wherein the steel wire rope of crane B (3) is connected to the movable lifting lug seat (31) located at the B lifting point (10). A trial lifting is performed. After confirming that it is safe and stable, the lifting is started and the angle between the monitoring side vertical frame (26) and the monitoring swing rod (28) is observed to realize the observation of the beam (1) and determine whether it is lifted correctly. Step 1 and 2, first, crane A (2) and crane B (3) lift the beam (1) and then rotate it in the direction of the bridge; then, the two cranes work together to lift the beam (1) to the transfer station (7), and place one end of the beam (1) stably on a temporary support point set on the slope platform of the road cut; secondly, the lifting eye seat (31) is moved to the A lifting point (9) and blocked by the transverse stop rod (33) at the end of the lifting eye A, so that the crane B (3) is hooked at the A lifting point (9); Step 1-3, first, the crane A (2) is transferred to the hoisting station at the top of the cutting; then, the auxiliary rotating shaft (35) drives the auxiliary swing arm (36) to swing upward, and at the same time, the inertia force is used to send the end of the auxiliary hanging rope (37) to the hoisting station at the top of the cutting; secondly, the crane A (2) hooks the auxiliary hanging rope (37), and after the beam (1) reaches the side span (6) position, the beam is dropped to complete the hoisting.

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