An intelligent construction technology for precast box girders of high-speed railways based on BIM technology

Abstract

The present invention discloses an intelligent construction technology for precast box girders of high-speed railways based on BIM technology. The construction technology includes the following steps: combining BIM technology with digital topographic maps to plan the beam yard on the digital topographic maps; strengthening the foundation of the beam yard and setting box girder piers on the foundation of the beam yard; forming precast box girders; curing the precast box girders and storing them after curing; transporting the precast box girders to the bridge erection area by a material transport vehicle and transporting the precast box girder construction safety protection device to both sides of the material transport vehicle; during the process of the hoisting winch on the bridge erector hoisting the precast box girder, the precast box girder construction safety protection device provides safety protection; and completing the construction of the precast box girder through the bridge erector. The present invention can keep the precast box girder stable when the precast box girder is lifted and suddenly encounters strong wind weather, thereby avoiding construction safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction. Specifically, it relates to an intelligent construction technology for precast box girders of high-speed railways based on BIM technology. Background Art

[0002] With the expansion of the scale of high-speed railway construction, the construction speed has accelerated, the market has become more open, and the competition has become more intense. Prestressed simply supported box girders are one of the indispensable components of high-speed railways, and the quality of them is directly related to the service life of the bridge. Therefore, attaching importance to the construction management of precast box girders and studying the construction control measures of precast box girders have become the directions that the industry is actively exploring and researching.

[0003] Patent No. 201811287053.0 discloses a construction method for precast box girders. During the construction process, after placing two matching precast blocks and a pier-top precast block above the pier top, concrete is poured into the pouring cavity from the pouring hole, so that the three are fixedly connected, which improves the situation of concrete cracks at the pier top and reduces the nutrient cost.

[0004] Patent No. 201610003444.X discloses a bridge erection machine and an erection method of the bridge erection machine, adopting a beam feeding process on the side of the vibrating beam. The site between the piers does not need to be cleared, hardened, and leveled. As long as the space at the construction site can allow the beam transport vehicle to transport the beam and move, it does not need to meet the large construction site required for the beam hoisting construction by a large truck crane or a crawler crane.

[0005] During the construction of precast box girders by a bridge erection machine, the precast box girders are transported to below the bridge erection machine by a beam transport vehicle, and the precast box girders need to be lifted by a hoist on the bridge erection machine. However, during the lifting process of the precast box girders, it is very afraid of strong wind weather, and in this case, it is easy to cause construction safety accidents. The existing construction methods for precast box girders do not have countermeasures for sudden strong winds.

[0006] Regarding the problems in the related art, no effective solution has been proposed yet. Summary of the Invention

[0007] Regarding the problems in the related art, the present invention proposes an intelligent construction technology for precast box girders of high-speed railways based on BIM technology to overcome the above-mentioned technical problems existing in the existing related technologies.

[0008] For this reason, the specific technical solution adopted by the present invention is as follows:

[0009] An intelligent construction technology for precast box girders of high-speed railways based on BIM technology uses a safety protection device for precast box girder construction to achieve safety protection during the construction of precast box girders of high-speed railways. The safety protection device for precast box girder construction consists of a mobile frame mechanism, a frame fixing mechanism, and a buffer limiting mechanism. This construction technology includes the following steps:

[0010] S1. Use a drone to obtain a digital topographic map of the beam yard, and combine BIM technology with the digital topographic map to carry out beam yard planning on the digital topographic map;

[0011] S2. Reinforce the foundation of the beam yard and set box girder piers on the foundation of the beam yard;

[0012] S3. Successively complete the binding of the steel cage of the precast box girder, the hoisting construction of the steel cage, the erection of the box girder formwork, and the concrete pouring construction to form a precast box girder;

[0013] S4. Cure the precast box girder and store it after curing;

[0014] S5. Transport the precast box girder to the bridge erection area by a transport vehicle, and transport the safety protection device for precast box girder construction to both sides of the transport vehicle;

[0015] S6. During the process of the winch on the bridge erector hoisting the precast box girder, the safety protection device for precast box girder construction provides safety protection;

[0016] S7. Complete the construction of the precast box girder through the bridge erector.

[0017] Furthermore, in order to be able to move the frame fixing mechanism and the buffer limiting mechanism to the bridge erection area, the mobile frame mechanism includes a mobile vehicle. Both sides of the mobile vehicle are provided with mobile wheel sets. Two frame fixing mechanisms are symmetrically arranged at both ends of the mobile vehicle. A number of first columns are arranged on one side of the top of the mobile vehicle. A number of buffer limiting mechanisms are arranged on the side wall of the first column far from the middle position of the mobile vehicle; A second column is arranged at the middle position on the other side of the top of the mobile vehicle. Third columns are arranged on both sides of the second column. Fourth columns are arranged on the side of the third column far from the second column. Handrails are arranged at the tops of the second column, the third column, and the fourth column, and the handrails are of T-shaped structure.

[0018] Further, to enable the staff working in the bridge erection area to pass through the mobile vehicle conveniently, and thus personnel can pass through in the narrow space of the bridge erection area without affecting normal construction. Moreover, each footrest is arranged from low to high and then from high to low, and the footrest can be folded, leaving a huge space above the mobile vehicle. This space can be used to store the work supplies of the staff. Placement grooves are provided on the side walls of the tops of the second, third, and fourth columns close to the side wall of the first column; a first fixing block is connected to the side wall of the first column close to the placement groove. An opening groove is arranged inside the first fixing block, a rotating shaft is arranged inside the opening groove, and one end of the footrest is connected to the rotating shaft, and the other end of the footrest is located in the adjacent placement groove.

[0019] Further, to prevent the footrest from folding easily, thereby ensuring the safety of the footrest during use, U-shaped frames are provided on the side walls of the second, third, and fourth columns and above the placement grooves. Two round rods are arranged at the middle position of the U-shaped frame, a square ring is arranged outside the two round rods, and the bottom end of the square ring extends to the side of the footrest.

[0020] Further, when the mobile vehicle stops, by squeezing with the ground, a large frictional force is generated to prevent the mobile vehicle from moving laterally, improving the stability and safety of the precast box girder construction safety protection device. At the same time, the buffer limiting mechanism can better complete the limiting work of the precast box girder. The frame fixing mechanism includes protection shells arranged at both ends of the mobile vehicle. A shell cover is arranged at one end of the protection shell. A square block is arranged on the inner side wall of the protection shell. A first sliding groove is vertically arranged at the middle position of the square block. A horizontal mounting block is connected to the middle upper part of the side wall of the square block. The end of the horizontal mounting block away from the square block is provided with a vertical mounting block; a first avoidance groove is arranged in the middle of the bottom end of the vertical mounting block. A first connecting shaft is arranged at the bottom end of the first avoidance groove. The first connecting shaft is connected to a rotating mounting block, and an electric cylinder is arranged on the side wall of the rotating mounting block; a second connecting shaft is arranged in the middle of the bottom end of the horizontal mounting block. The second connecting shaft is connected to the top end of a first rotating plate. A second avoidance groove is arranged at the bottom end of the first rotating plate. A third connecting shaft is arranged at the bottom end of the second avoidance groove. The middle part of the third connecting shaft is connected to the output shaft of the electric cylinder; a second rotating plate is arranged below the first rotating plate. A third avoidance groove is arranged at the top end of the second rotating plate, and the top end of the second rotating plate is connected to both ends of the third connecting shaft; a first sliding block is arranged inside the first sliding groove. The top end of the first sliding block is connected to the bottom end of the second rotating plate, and the bottom end of the first sliding block penetrates through the bottom end of the protection shell and extends below the protection shell; baffles are arranged on both sides of the bottom end of the square block and inside the first sliding groove. One side of each baffle close to the middle position of the square block extends to the side of the first sliding block.

[0021] Further, to improve the anti-slip ability of the support plate, a support plate is arranged at the bottom end of the first sliding block, and a plurality of anti-slip strips are arranged at the bottom end of the support plate.

[0022] Further, in order to prevent the precast box girder from sliding on the side of the precast box girder during the lifting of the precast box girder, so as to effectively prevent the precast box girder from shaking in case of strong wind, giving the on-site construction personnel time to make adjustments, thus avoiding construction accidents, and having strong buffering capacity and adaptability. At the same time, under normal conditions, it will not affect the normal lifting of the precast box girder. The buffer limit mechanism includes a second fixed block arranged on the side wall of the first column away from the middle position of the moving vehicle. A number of square grooves are horizontally arranged inside the second fixed block. Sliding grooves two are arranged on both sides of the square groove. A moving block is arranged inside the square groove. Sliding blocks two that cooperate with the sliding grooves two are arranged on both sides of the moving block. One end of the moving block away from the inside of the square groove is provided with a bull's eye bearing, and the bull's eye bearing is threadedly connected with the moving block; a first magnet is arranged on the inner wall of the square groove. A second magnet is arranged at one end of the moving block close to the first magnet; first spring columns are arranged on the upper and lower ends of the first magnet and on the inner wall of the square groove. Second spring columns are arranged at one end of the moving block close to the first spring columns. A buffer spring is sleeved outside the first spring column, and one end of the buffer spring extends to the second spring column.

[0023] Further, in order to connect and fix the second fixed block with the first column, connecting plates are arranged on both sides of one end of the second fixed block close to the first column. The connecting plates are connected with the first column through bolts.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) When the precast box girder is lifted and suddenly encounters strong wind weather, the present invention can keep the precast box girder stable to avoid construction safety accidents.

[0026] (2) By setting the moving frame mechanism, the frame fixing mechanism and the buffer limit mechanism can be moved to the bridge erection area, enabling the construction staff in the bridge erection area to conveniently pass through the moving vehicle. Thus, personnel can pass through in the narrow space of the bridge erection area without affecting normal construction. And each footrest is from low to high and then from high to low. At the same time, the footrest can be folded up, leaving a huge space above the moving vehicle. This space can be used to store the work supplies of the staff. At the same time, the footrest will not be easily folded up, thus ensuring the safety of the footrest during use.

[0027] (3) By setting the frame fixing mechanism, when the moving vehicle stops, a large frictional force can be generated by squeezing with the ground, thereby preventing the moving vehicle from moving horizontally, improving the stability and safety of the precast box girder construction safety protection device, and enabling the buffer limit mechanism to better complete the limit work of the precast box girder.

[0028] (4) By setting up a buffer limit mechanism, when the precast box girder is lifted, the precast box girder can be restricted from sliding on the side during the lifting process. Furthermore, when encountering strong winds suddenly, the precast box girder can be effectively prevented from shaking, giving the on-site construction personnel time to make adjustments, thereby avoiding construction accidents. In addition, it has strong buffering ability and adaptability. At the same time, under normal conditions, it will not affect the normal lifting of the precast box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 is a three-dimensional structural schematic diagram of a precast box girder construction safety protection device in an intelligent construction technology for high-speed railway precast box girders based on BIM technology according to an embodiment of the present invention;

[0031] Figure 2 is Figure 1 a partial enlarged view of part A in

[0032] Figure 3 is a partial schematic diagram of a moving frame mechanism in an intelligent construction technology for high-speed railway precast box girders based on BIM technology according to an embodiment of the present invention;

[0033] Figure 4 is a structural schematic diagram of a first fixed block in an intelligent construction technology for high-speed railway precast box girders based on BIM technology according to an embodiment of the present invention;

[0034] Figure 5 is a three-dimensional structural schematic diagram of a precast box girder construction safety protection device in an intelligent construction technology for high-speed railway precast box girders based on BIM technology from another angle according to an embodiment of the present invention

[0035] Figure 6 is Figure 5 a partial enlarged view of part B in

[0036] Figure 7 is a three-dimensional structural schematic diagram of a buffer limit mechanism in an intelligent construction technology for high-speed railway precast box girders based on BIM technology according to an embodiment of the present invention;

[0037] Figure 8 is a partial cross-sectional view of a buffer limit mechanism in an intelligent construction technology for high-speed railway precast box girders based on BIM technology according to an embodiment of the present invention;

[0038] Figure 9 It is a schematic internal structure diagram of a frame fixing mechanism in an intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to an embodiment of the present invention;

[0039] Figure 10 It is a schematic internal structure diagram from another angle of a frame fixing mechanism in an intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to an embodiment of the present invention

[0040] Figure 11 is Figure 10 a partial enlarged view at position C in

[0041] In the figure:

[0042] 1. Mobile frame mechanism; 101. Mobile vehicle; 102. Mobile wheel set; 103. First column; 104. Second column; 105. Third column; 106. Fourth column; 107. Handrail; 108. Placing groove; 109. First fixing block; 110. Opening groove; 111. Rotating shaft; 112. Footrest; 113. U-shaped frame; 114. Round rod; 115. Square ring; 2. Frame fixing mechanism; 201. Protection housing; 202. Housing cover; 203. Square block; 204. First chute; 205. Horizontal mounting block; 206. Vertical mounting block; 207. First avoidance groove; 208. First connecting shaft; 209. Rotating mounting block; 210. Electric cylinder; 211. Second connecting shaft; 212. First rotating plate; 213. Second avoidance groove; 214. Third connecting shaft; 215. Second rotating plate; 216. Third avoidance groove; 217. First slider; 218. Baffle; 219. Support plate; 220. Anti-slip strip; 3. Buffer and limit mechanism; 301. Second fixing block; 302. Square groove; 303. Second chute; 304. Moving block; 305. Second slider; 306. Bull's-eye bearing; 307. First magnet; 308. Second magnet; 309. First spring column; 310. Second spring column; 311. Buffer spring; 312. Connecting plate; 313. Bolt. Specific embodiments

[0043] To further illustrate the embodiments, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0044] According to an embodiment of the present invention, an intelligent technical construction process of precast box girders for high-speed railways based on BIM technology is provided.

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. As Figure 1 and 5 shown, according to the intelligent construction technology of precast box girders for high-speed railways based on BIM technology in an embodiment of the present invention, a safety protection device for precast box girder construction is used to achieve safety protection during the construction of precast box girders for high-speed railways. The safety protection device for precast box girder construction is composed of a mobile frame mechanism 1, a frame fixing mechanism 2, and a buffer limiting mechanism 3. The construction technology includes the following steps:

[0046] S1. Use a drone to obtain a digital topographic map of the beam yard, and combine BIM technology with the digital topographic map to carry out beam yard planning on the digital topographic map;

[0047] S2. Reinforce the foundation of the beam yard and set box girder piers on the foundation of the beam yard;

[0048] S3. Successively complete the binding of the steel cage of the precast box girder, the hoisting construction of the steel cage, the erection of the box girder formwork, and the concrete pouring construction to form a precast box girder;

[0049] S4. Cure the precast box girder and store it after curing;

[0050] S5. Transport the precast box girder to the bridge erection area by a transport vehicle, and transport the safety protection device for precast box girder construction to both sides of the transport vehicle;

[0051] S6. During the process of the hoisting winch on the bridge erecting machine hoisting the precast box girder, the safety protection device for precast box girder construction provides safety protection;

[0052] S7. Complete the construction of the precast box girder through the bridge erecting machine.

[0053] As Figures 1-5As shown, in one embodiment, for the above-mentioned mobile frame mechanism 1, the mobile frame mechanism 1 includes a mobile vehicle 101. Both sides of the mobile vehicle 101 are provided with mobile wheel sets 102. Two frame fixing mechanisms 2 are symmetrically arranged at both ends of the mobile vehicle 101. A number of first columns 103 are arranged on one side of the top of the mobile vehicle 101. A number of buffer limiting mechanisms 3 are arranged on the side wall of the first column 103 away from the middle position of the mobile vehicle 101. In the middle position on the other side of the top of the mobile vehicle 101, a second column 104 is arranged. On both sides of the second column 104, third columns 105 are arranged. On the side of the third column 105 away from the second column 104, fourth columns 106 are arranged. Armrests 107 are arranged at the tops of the second column 104, the third column 105 and the fourth column 106, and the armrest 107 is of a T-shaped structure. Placing grooves 108 are formed on the side walls of the second column 104, the third column 105 and the fourth column 106 near the first column 103. A first fixing block 109 is connected to the side wall of the first column 103 near the placing groove 108. An opening groove 110 is arranged inside the first fixing block 109. A rotating shaft 111 is arranged inside the opening groove 110. One end of the rotating shaft 111 is connected to one end of a footrest 112, and the other end of the footrest 112 is located in the adjacent placing groove 108. U-shaped frames 113 are arranged on the side walls of the second column 104, the third column 105 and the fourth column 106 and above the placing grooves 108. Two round rods 114 are arranged in the middle position of the U-shaped frame 113. A square ring 115 (in addition, in actual application, the square ring 115 can be designed into a circular ring structure) is arranged outside the two round rods 114, and the bottom end of the square ring 115 extends to the side of the footrest 112. Thus, the frame fixing mechanism 2 and the buffer limiting mechanism 3 can be moved to the bridge erection area, enabling the construction workers in the bridge erection area to conveniently pass through the mobile vehicle. Furthermore, personnel can pass through in the narrow space of the bridge erection area without affecting normal construction. Moreover, each footrest 112 is arranged from low to high and then from high to low, and the footrest 112 can be folded. A huge space is left above the mobile vehicle 101, and this space can be used to store the work supplies of the workers.

[0054] The working principle of the mobile frame mechanism 1 during use is as follows: When it is necessary to enter the interior of the mobile vehicle 101, each footrest 112 is folded. When the footrest 112 is folded, the square ring 115 is pulled upward. At this time, the end of the footrest 112 away from the rotating shaft 111 is rotated out of the placing groove 108 and rotated to the position of the first column 103. At this time, the interior of the mobile vehicle 101 can be entered.

[0055] As Figures 9-11As shown, in one embodiment, for the above-mentioned frame fixing mechanism 2, the frame fixing mechanism 2 includes protective casings 201 provided at both ends of the mobile vehicle 101. One end of the protective casing 201 is provided with a casing cover 202. A square block 203 is provided on the inner side wall of the protective casing 201. A chute 204 is vertically opened at the middle position of the square block 203. A horizontal mounting block 205 is connected to the upper middle part of the side wall of the square block 203. A vertical mounting block 206 is provided at the end of the horizontal mounting block 205 away from the square block 203. A first avoidance groove 207 is opened at the middle of the bottom end of the vertical mounting block 206. A first connecting shaft 208 is provided at the bottom end of the first avoidance groove 207. The first connecting shaft 208 is connected to a rotating mounting block 209. An electric cylinder 210 is provided on the side wall of the rotating mounting block 209. A second connecting shaft 211 is provided at the middle of the bottom end of the horizontal mounting block 205. The second connecting shaft 211 is connected to the top end of a first rotating plate 212. A second avoidance groove 213 is opened at the bottom end of the first rotating plate 212. A third connecting shaft 214 is provided at the bottom end of the second avoidance groove 213. The middle of the third connecting shaft 214 is connected to the output shaft of the electric cylinder 210. A second rotating plate 215 is provided below the first rotating plate 212. A third avoidance groove 216 is provided at the top end of the second rotating plate 215. The top end of the second rotating plate 215 is connected to both ends of the third connecting shaft 214. A first slider 217 is provided inside the chute 204. The top end of the first slider 217 is connected to the bottom end of the second rotating plate 215. The bottom end of the first slider 217 penetrates through the bottom end of the protective casing 201 and extends below the protective casing 201. Baffles 218 are provided at both sides of the bottom end of the square block 203 and on both sides of the chute 204 (in addition, in specific applications, the baffles 218 are connected to the square block 203 by flat head bolts). One side of the baffles 218 close to the middle position of the square block 203 extends to the side of the first slider 217. A support plate 219 is provided at the bottom end of the first slider 217. A plurality of anti-slip strips 220 are provided at the bottom end of the support plate 219. Thus, when the mobile vehicle 101 stops, by squeezing the ground, a large frictional force can be generated, thereby preventing the mobile vehicle 101 from moving horizontally, improving the stability and safety of the precast box girder construction safety protection device, and at the same time enabling the buffer limiting mechanism 3 to better complete the limiting work of the precast box girder.

[0056] The working principle of the frame fixing mechanism 2 is as follows: The electric cylinder 210 drives the first rotating plate 212 to rotate. At the same time, the second rotating plate 215 also rotates, so that the distance between the top end of the first rotating plate 212 and the bottom end of the second rotating plate 215 increases, and then the first slider 217 and the support plate 219 descend. The support plate 219 and the anti-slip strips at its bottom end squeeze the ground. And through the coordinated use of the first rotating plate 212, the second rotating plate 215 and the electric cylinder 210, the bearing capacity of the support plate 219 is large.

[0057] As Figures 6-8As shown, in one embodiment, for the above-mentioned buffer limiting mechanism 3, the buffer limiting mechanism 3 includes a second fixed block 301 provided on the side wall of the first column 103 away from the middle position of the moving vehicle 101. A number of square grooves 302 are horizontally provided inside the second fixed block 301. Slide grooves two 303 are provided on both sides of the square groove 302. A moving block 304 is provided inside the square groove 302. Slide blocks two 305 that cooperate with the slide grooves two 303 are provided on both sides of the moving block 304. One end of the moving block 304 away from the inside of the square groove 302 is provided with a bull's-eye bearing 306, and the bull's-eye bearing 306 is threadedly connected to the moving block 304; a first magnet 307 is provided on the inner wall of the square groove 302. A second magnet 308 is provided at one end of the moving block 304 close to the first magnet 307; first spring columns 309 are provided on the upper and lower ends of the first magnet 307 and on the inner wall of the square groove 302. Second spring columns 310 are provided at one end of the moving block 304 close to the first spring columns 309. A buffer spring 311 (in addition, in specific applications, the above-mentioned buffer spring 311 uses a compression spring) is sleeved outside the first spring column 309, and one end of the buffer spring 311 extends to the second spring column 310; on both sides of one end of the second fixed block 301 close to the first column 103, connecting plates 312 are provided. The connecting plates 312 are connected to the first column 103 by bolts 313. Thus, when the precast box girder is lifted, the precast box girder is restricted from sliding on the side of the precast box girder in advance. Furthermore, when encountering strong winds suddenly, the precast box girder can be effectively prevented from shaking, giving the on-site construction personnel time to make adjustments. Furthermore, construction accidents can be avoided, and the buffer capacity is strong and the adaptability is strong. At the same time, under normal conditions, it will not affect the normal lifting of the precast box girder.

[0058] The working principle of the buffer limiting mechanism 3 is as follows: When the precast box girder rises, the bull's-eye bearings 306 on both sides thereof will not affect the normal rising of the precast box girder, and through the combined use of the first magnet 307 and the second magnet 308 and the buffer spring 311, a buffer protection effect is achieved.

[0059] In order to facilitate the understanding of the above technical solutions of the present invention, the following will describe in detail the working principle or operation method of the present invention in the actual process.

[0060] In actual application, the mobile vehicle 101 is moved to the side of the precast box girder in the bridging area, and the electric cylinder 210 is started. The electric cylinder 210 drives the first rotating plate 212 to rotate. At the same time, the second rotating plate 215 also rotates, so that the distance between the top of the first rotating plate 212 and the bottom of the second rotating plate 215 increases, and then the first slider 217 and the support plate 219 descend. The support plate 219 and the anti-slip strips at its bottom are pressed against the ground. And through the coordinated use of the first rotating plate 212, the second rotating plate 215 and the electric cylinder 210, the bearing capacity of the support plate 219 is large. When the mobile vehicle 101 moves, the support plate 219 needs to be raised, and at this time, the above-mentioned movement is reversed. When the precast box girder rises, the bull's-eye bearings 306 on both sides thereof will not affect the normal rising of the precast box girder, and through the coordinated use of the first magnet 307 and the second magnet 308 and the buffer spring 311, a buffer protection effect is achieved.

[0061] In the bridging area, the staff can move the mobile vehicle through the foot pedal 112. Work items can be stored inside the mobile vehicle 101. When it is necessary to enter the inside of the mobile vehicle 101, each foot pedal 112 is folded. When the foot pedal 112 is folded, the square ring 115 is pulled up. At this time, the end of the foot pedal 112 far from the rotating shaft 111 is rotated out of the placement groove 108 and rotated to the first column 103. At this time, the middle position at the top of the mobile vehicle 101 can be entered.

[0062] In summary, when the precast box girder is lifted and suddenly encounters strong wind weather, the present invention can make the precast box girder maintain a certain stability, thereby avoiding construction safety accidents. By setting the mobile frame mechanism 1, the frame fixing mechanism 2 and the buffer limiting mechanism 3 can be moved to the bridging area, enabling the staff constructing in the bridging area to conveniently pass through the mobile vehicle 101. Thus, personnel can pass through in the narrow space of the bridging area without affecting normal construction. And each foot pedal 112 is from low to high and then from high to low, and at the same time, the foot pedal 112 can be folded, leaving a huge space above the mobile vehicle 101. This space can be used to store the work supplies of the staff. At the same time, the foot pedal 112 will not be easily folded, thereby ensuring the safety of the foot pedal 112 during use. By setting the frame fixing mechanism 2, when the mobile vehicle 101 stops, a large frictional force can be generated by pressing against the ground, thereby preventing the mobile vehicle 101 from moving laterally, improving the stability and safety of the precast box girder construction safety protection device, and at the same time enabling the buffer limiting mechanism 3 to better complete the limiting work of the precast box girder. By setting the buffer limiting mechanism 3, when the precast box girder is lifted, the precast box girder is restricted from sliding on the side of the precast box girder. Thus, when suddenly encountering strong wind, the precast box girder can be effectively prevented from shaking, giving the on-site construction personnel time to make adjustments, and thereby avoiding the occurrence of construction accidents. And it has strong buffering ability and strong adaptability. At the same time, under normal conditions, it will not affect the normal lifting of the precast box girder.

[0063] In the present invention, unless otherwise clearly specified or limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent construction technology for precast box girders of high-speed railways based on BIM technology, characterized in that, The precast box girder construction safety protection device is adopted to realize the safety protection during the construction of high-speed railway precast box girders. The precast box girder construction safety protection device is composed of a moving frame mechanism (1), a frame fixing mechanism (2) and a buffer limiting mechanism (3). The construction process includes the following steps: S1. Use a drone to obtain the digital topographic map of the beam yard, and combine it with the digital topographic map using BIM technology to carry out beam yard planning on the digital topographic map; S2. Reinforce the foundation of the beam yard and set box girder piers on the foundation of the beam yard; S3. Successively complete the binding of the steel cage of the precast box girder, the hoisting construction of the steel cage, the erection of the box girder formwork and the concrete pouring construction to form a precast box girder; S4. Cure the precast box girder and store it after curing; S5. Transport the precast box girder to the bridge erection area by a transport vehicle, and transport the precast box girder construction safety protection device to both sides of the transport vehicle; S6. During the process of the winch on the bridge erector lifting the precast box girder, the precast box girder construction safety protection device provides safety protection; S7. Complete the construction of the precast box girder through the bridge erector; The moving frame mechanism (1) includes a moving vehicle (101). Both sides of the moving vehicle (101) are provided with moving wheel sets (102). Two of the frame fixing mechanisms (2) are symmetrically arranged at both ends of the moving vehicle (101). A number of first columns (103) are arranged on one side of the top end of the moving vehicle (101). A number of the buffer limiting mechanisms (3) are arranged on the side wall of the first column (103) far from the middle position of the moving vehicle (101); A second column (104) is arranged at the middle position on the other side of the top end of the moving vehicle (101). Third columns (105) are arranged on both sides of the second column (104). Fourth columns (106) are arranged on the side of the third column (105) far from the second column (104). Handrails (107) are arranged at the top ends of the second column (104), the third column (105) and the fourth column (106), and the handrail (107) is of a T-shaped structure; The buffer limiting mechanism (3) includes a second fixing block (301) arranged on the side wall of the first column (103) far from the middle position of the moving vehicle (101). A number of square grooves (302) are horizontally arranged inside the second fixing block (301). Slide grooves two (303) are arranged on both sides of the square groove (302). A moving block (304) is arranged inside the square groove (302). Slide blocks two (305) matched with the slide grooves two (303) are arranged on both sides of the moving block (304). A bull's eye bearing (306) is arranged at one end of the moving block (304) far from the inside of the square groove (302), and the bull's eye bearing (306) is threadedly connected with the moving block (304); A first magnet (307) is arranged on the inner wall of the square groove (302). A second magnet (308) is arranged at one end of the moving block (304) close to the first magnet (307).

2. The intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to claim 1, wherein, Placement grooves (108) are provided on the tops of the second column (104), the third column (105), and the fourth column (106) close to the side wall of the first column (103). A first fixing block (109) is connected to the side wall of the first column (103) close to the placement groove (108). An opening groove (110) is provided inside the first fixing block (109). A rotating shaft (111) is arranged inside the opening groove (110). One end of the rotating shaft (111) is connected to one end of a foot pedal (112), and the other end of the foot pedal (112) is located inside the adjacent placement groove (108).

3. The intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to claim 2, characterized in that, U-shaped frames (113) are provided on the side walls of the second column (104), the third column (105), and the fourth column (106) and above the placement grooves (108). Two round rods (114) are arranged at the middle position of the U-shaped frames (113). A square ring (115) is arranged on the outer sides of the two round rods (114), and the bottom end of the square ring (115) extends to the side of the foot pedal (112).

4. A kind of intelligent technical construction process for precast box girders of high-speed railways based on BIM technology according to claim 3, characterized in that The frame fixing mechanism (2) includes protective shells (201) arranged at both ends of the moving cart (101). A shell cover (202) is arranged at one end of the protective shell (201). A square block (203) is arranged on the inner side wall of the protective shell (201). A first sliding groove (204) is vertically opened at the middle position of the square block (203). A horizontal mounting block (205) is connected to the middle upper part of the side wall of the square block (203). A vertical mounting block (206) is arranged at the end of the horizontal mounting block (205) away from the square block (203). A first avoidance groove (207) is opened at the middle part of the bottom end of the vertical mounting block (206). A first connecting shaft (208) is arranged at the bottom end of the first avoidance groove (207). The first connecting shaft (208) is connected to a rotating mounting block (209). An electric cylinder (210) is arranged on the side wall of the rotating mounting block (209). A second connecting shaft (211) is arranged at the middle part of the bottom end of the horizontal mounting block (205). The second connecting shaft (211) is connected to the top end of a first rotating plate (212). A second avoidance groove (213) is opened at the bottom end of the first rotating plate (212). A third connecting shaft (214) is arranged at the bottom end of the second avoidance groove (213). The middle part of the third connecting shaft (214) is connected to the output shaft of the electric cylinder (210). A second rotating plate (215) is arranged below the first rotating plate (212). A third avoidance groove (216) is arranged at the top end of the second rotating plate (215), and the top end of the second rotating plate (215) is connected to both ends of the third connecting shaft (214). A first slider (217) is arranged inside the first sliding groove (204). The top end of the first slider (217) is connected to the bottom end of the second rotating plate (215), and the bottom end of the first slider (217) penetrates through the bottom end of the protective shell (201) and extends below the protective shell (201).

5. The intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to claim 4, characterized in that, On both sides of the bottom end of the square block (203) and located in the first chute (204), baffles (218) are provided, and one side of each baffle (218) close to the middle position of the square block (203) extends to the side of the first slider (217).

6. The intelligent technical construction process of precast box girders for high-speed railways based on BIM technology according to claim 5, wherein, A support plate (219) is provided at the bottom end of the first slider (217), and a number of anti-slip strips (220) are provided at the bottom end of the support plate (219).

7. A construction process for the intelligent technology of precast box girders of high-speed railways based on BIM technology according to claim 6, characterized in that, Spring columns one (309) are provided on the inner walls of the square groove (302) at the upper and lower ends of the first magnet (307). One end of the moving block (304) close to the spring column one (309) is provided with a spring column two (310). A buffer spring (311) is sleeved outside the spring column one (309), and one end of the buffer spring (311) extends to the spring column two (310).

8. A construction process of an intelligent technology for precast box girders of high-speed railways based on BIM technology according to claim 7, characterized in that, On both sides of one end of the second fixed block (301) close to the first column (103), connecting plates (312) are provided, and the connecting plates (312) are connected to the first column (103) through bolts (313).

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