Bridge Construction Suspender Preloading Test System Based on Finite Element Simulation

Abstract

The present invention relates to the field of hanging basket construction, and more specifically, to a preloading test system for a bridge construction hanging basket based on finite element simulation, comprising: a preloading test device and a data acquisition device; the preloading test device includes a preloading mechanism for preloading the hanging basket; the preloading mechanism is connected to a backpressure suspension mechanism, and a preloading point adjustment mechanism is connected to the backpressure suspension mechanism; the data acquisition device is connected to the preloading mechanism to detect and collect the displacement between the hanging basket and the bridge when the preloading mechanism preloads the hanging basket. For the preloading test system for a bridge construction hanging basket based on finite element simulation of the present invention, the preloading contact point between the internal preloading mechanism and the hanging basket can be adjusted, so as to apply pressure to different positions of the hanging basket for testing and meet the fixed-point test requirements of different positions.

Description

Technical Field

[0001] The invention relates to the field of hanging basket construction, and more specifically to a bridge construction hanging basket preloading test system based on finite element simulation. Background Art

[0002] The suspended hanging basket is a construction platform for aerial operations when the upper cantilever box girder of the bridge is cast in situ. It includes a suspension truss arranged on the upper side of the end of the cast cantilever box girder section of the bridge and a bottom formwork support frame arranged on the lower side of the end of the cast cantilever girder section of the bridge, and the two are connected by a hanger.

[0003] The suspended hanging basket can replace the steel pipe support erected from the ground upward and large vertical and horizontal transportation machinery. It is less affected by the harsh environment such as water flow, high piers, and canyons during construction. Especially when constructing a cross-line bridge, there is no need to erect a steel pipe support that disconnects the traffic under the bridge. It can also make full use of the limited space. The suspended hanging basket is easy to assemble and disassemble, and can be reused many times, greatly reducing the construction cost. After the cantilever casting construction hanging basket is assembled on the top of the pier, a loading test must be carried out to verify the reliability of the hanging basket. At the same time, the deformation of the hanging basket under different loads must be measured, so as to adjust the formwork elevation and control the linear shape of the beam during the normal use of the hanging basket. Commonly used pressure testing methods include the sandbag method and the hoisting weight method, which have the following defects: large amount of sand or large amount of load. The test requires hundreds of tons of sand or heavy objects. Large-tonnage hanging baskets require more sand, which increases the difficulty of the test. There are also greater safety risks in operation, slow loading time, high equipment requirements, and high costs.

[0004] However, the existing technology uses a reaction frame for prestressing test devices, which has the problem of being inconvenient to adjust the prestressing test position. For example, the asymmetric loading prestressing device for the bridge cantilever casting construction hanging basket with patent number CN201110438662.3 includes a No. 0 block on the upper end of the pier body, a hanging basket connected to the No. 0 block, and a reaction frame, the reaction frame is a triangular frame when viewed from the side; the triangular frame is composed of a vertical frame, a base frame and an inclined frame, and the reaction frame is provided with two triangular frames, which are connected by a cross brace; when in use, a jack is provided between the connection point between the base frame and the inclined frame and the front lower cross beam of the hanging basket; the connection ends of the base frame and the inclined frame and the vertical frame are respectively fixedly connected to the No. 0 block. When using this loading prestressing device, it is necessary to constantly disassemble the jack to adjust the connection position between the jack and the hanging basket to meet the prestressing test at different positions, which is inconvenient to operate and has low efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bridge construction hanging basket preloading test system based on finite element simulation.

[0006] The technical solution adopted by the bridge construction hanging basket preloading test system based on finite element simulation of the present invention is as follows:

[0007] The bridge construction hanging basket preloading test system based on finite element simulation includes a preloading test device and a data acquisition device; the preloading test device includes a preloading mechanism for preloading the hanging basket; the preloading mechanism is connected to a counterweight suspension mechanism, and a preloading point adjustment mechanism is connected to the counterweight suspension mechanism; the data acquisition device is connected to the preloading mechanism to detect and collect the displacement between the hanging basket and the bridge when the preloading mechanism preloads the hanging basket.

[0008] Further, the data acquisition device includes a displacement sensor, and the displacement sensor is wirelessly connected to a host computer through a wireless communication module to transmit the collected hanging basket displacement information to the host computer.

[0009] Further, the data acquisition device further includes a pressure sensor connected to the preloading mechanism, and the pressure sensor is wirelessly connected to the host computer through a wireless communication module to detect and collect the pressure applied when the preloading mechanism preloads the hanging basket through the pressure sensor and transmit the pressure information to the host computer.

[0010] Further, the counterweight suspension mechanism includes two counterweight longitudinal beams, and more than one counterweight cross beam is fixedly connected between the two counterweight longitudinal beams; suspension sliding seats are slidably arranged on the two counterweight longitudinal beams, and one end of two counterweight inclined beams is rotatably connected to the two suspension sliding seats, and the other end of the two counterweight inclined beams is rotatably connected to two counterweight sliding frames, and the two counterweight sliding frames are slidably connected to two bearing cross beams; the preloading mechanism is connected between the two counterweight sliding frames.

[0011] Further, the preloading point adjustment mechanism includes two hanging screws, and the two hanging screws are rotatably connected to the two counterweight longitudinal beams one by one; a suspension sliding seat is screwed on each hanging screw, and more than one pressing rod is screwed on each suspension sliding seat, and the pressing rod presses against the hanging screw.

[0012] Further, the counterweight suspension mechanism further includes two strengthening cross beams, and the two strengthening cross beams are fixedly connected to the two counterweight longitudinal beams and are located between the two counterweight longitudinal beams; fixed anchoring holes are arranged on the two strengthening cross beams, and strengthening sliding beams are slidably connected to one end of the two strengthening cross beams away from the two bearing cross beams, and movable anchoring holes are arranged on the two strengthening sliding beams; one end of two strengthening inclined beams is rotatably connected to the two strengthening sliding beams, and the other end of the two strengthening inclined beams is rotatably connected to the two suspension sliding seats one by one.

[0013] Further, the preloading mechanism includes an upper triangular pressing frame connected to two counter-pressure sliding frames. The upper triangular pressing frame is rotatably connected to the movable end of a preloading jack, and the fixed end of the preloading jack is fixed on a lower triangular pressing frame. A longitudinal jacking shaft is slidably connected to the lower triangular pressing frame. The middle of the longitudinal jacking shaft is fixedly connected to a force transmission seat, and the force transmission seat is rotatably connected to one end of a rotation control screw. The rotation control screw is threadedly connected to a transverse plate on the side of the lower triangular pressing frame. The upper end of the longitudinal jacking shaft is inserted into a longitudinal insertion hole of the upper triangular pressing frame.

[0014] Further, a rectangular beam is fixedly connected to the middle of the inner side of the upper triangular pressing frame. The rectangular beam divides the upper triangular pressing frame into two triangular support structures. A longitudinal sliding beam is slidably connected in a longitudinal sliding groove at the bottom of the rectangular beam. The longitudinal sliding beam is fixedly connected to a pressing seat, and the pressing seat is rotatably connected to the movable end of the preloading jack. A limiting rod threadedly connected to the rectangular beam slides in a longitudinal sliding track on the longitudinal sliding beam. When the upper surface of the longitudinal sliding beam contacts the top surface of the longitudinal sliding groove, the limiting rod contacts the bottom surface of the longitudinal sliding track.

[0015] Further, a lower chamber is provided at the bottom of the horizontal pressing plate of the lower triangular pressing frame. Two L-shaped pressing plates are slidably connected in the lower chamber. The vertical plates of the two L-shaped pressing plates are oppositely threadedly connected to a bidirectional screw. The lower surfaces of the horizontal plates of the two L-shaped pressing plates are coplanar with the lower surface of the horizontal pressing plate. Both ends of the bidirectional screw are rotatably connected to both ends of the horizontal pressing plate. A data acquisition device is connected to the horizontal pressing plate.

[0016] Further, a plurality of longitudinal threaded interfaces are provided on the horizontal plates of the two L-shaped pressing plates. A longitudinal hanging pipe is threadedly connected in each longitudinal threaded interface. A counterweight water bag is fixedly connected to the bottom of each longitudinal hanging pipe. A gear is fixedly connected to the outer end of the bidirectional screw. The gear meshes with a rack fixedly connected to the movable end of a hydraulic rod. The fixed end of the hydraulic rod is fixed on the side surface of the horizontal pressing plate, and the rack slides in a rectangular sliding sleeve on the side surface of the horizontal pressing plate.

[0017] The beneficial effects of the present invention are as follows:

[0018] For the preloading test system of the bridge construction hanging basket based on finite element simulation of the present invention, the preloading contact points between the internal preloading mechanism and the hanging basket can be adjusted, so as to apply pressure to different positions of the hanging basket for testing, meeting the fixed-point test requirements of different positions. And a data acquisition device is provided inside the present invention, which can detect and collect the displacement amount between the hanging basket and the bridge when the preloading mechanism preloads the hanging basket, facilitating real-time monitoring and collection of the stress conditions of key parts of the hanging basket, and comparing and verifying the actual data information with the finite element analysis results before preloading, effectively conducting the preloading test on the bridge construction hanging basket and detecting the stability of the hanging basket structure.

[0019] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, detailed descriptions are as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings:

[0021] Figure 1 Overall schematic provided for the embodiments of the present invention Figure 1 ;

[0022] Figure 2 Overall schematic provided for the embodiments of the present invention Figure 2 ;

[0023] Figure 3 Overall schematic provided for the embodiments of the present invention Figure 3 ;

[0024] Figure 4 Schematic of the preloading mechanism provided for the embodiments of the present invention Figure 1 ;

[0025] Figure 5 Schematic of the preloading mechanism provided for the embodiments of the present invention Figure 2 ;

[0026] Figure 6 Partial view of the preloading mechanism provided for the embodiments of the present invention;

[0027] Figure 7 Schematic of the upper triangular pressing frame provided for the embodiments of the present invention;

[0028] Figure 8 Schematic of the lower triangular pressing frame provided for the embodiments of the present invention;

[0029] Figure 9 Partial sectional view of the lower triangular pressing frame provided for the embodiments of the present invention;

[0030] Figure 10 Schematic of the L-shaped pressing plate provided for the embodiments of the present invention;

[0031] Figure 11 Schematic of the counter-pressure suspension mechanism provided for the embodiments of the present invention Figure 1 ;

[0032] Figure 12 Schematic of the counter-pressure suspension mechanism provided for the embodiments of the present invention Figure 2 ;

[0033] Figure 13 Schematic of the suspension slide provided for the embodiments of the present invention;

[0034] Figure 14 Schematic of the connection between the limiting rod and the longitudinal slide beam provided for the embodiments of the present invention.

[0035] Icons: Data acquisition device 1; Preloading mechanism 2; Upper triangular pressure frame 201; Preloading jack 202; Lower triangular pressure frame 203; Longitudinal top shaft 204; Force transmission seat 205; Rotary control screw 206; Upper rectangular beam 207; Longitudinal sliding beam 208; Pressure seat 209; Limit rod 210; L-shaped pressing plate 211; Bi-directional screw 212; Longitudinal thread interface 213; Longitudinal pipe sling 214; Counterweight water bag 215; Gear 216; Hydraulic rod 217; Rack 218; Horizontal pressing plate 219; Backpressure suspension mechanism 3; Backpressure longitudinal beam 301; Backpressure cross beam 302; Suspension sliding seat 303; Backpressure inclined beam 304; Backpressure sliding frame 305; Bearing cross beam 306; Reinforcing cross beam 307; Reinforcing sliding beam 308; Reinforcing inclined beam 309; Preloading point adjustment mechanism 4. Detailed implementation manners

[0036] In order to clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be understood that terms such as "having", "comprising" and "including" as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0038] Embodiment 1

[0039] Please refer to Figure 1-14 , the bridge construction hanging basket preloading test system based on finite element simulation provided by the present invention includes: a preloading test device and a data acquisition device 1; the preloading test device includes a preloading mechanism 2 for preloading the hanging basket; the preloading mechanism 2 is connected to a backpressure suspension mechanism 3, and a preloading point adjustment mechanism 4 is connected to the backpressure suspension mechanism 3; the data acquisition device 1 is connected to the preloading mechanism 2 to detect and collect the displacement amount between the hanging basket and the bridge when the preloading mechanism 2 preloads the hanging basket.

[0040] The working principle and technical effects of the above technical solution are as follows:

[0041] The preloading test system for bridge construction hanging baskets based on finite element simulation of the present invention is used for preloading test of bridge construction hanging baskets. During the preloading test, the counterweight suspension mechanism 3 is connected to the bridge and anchored to improve the stability of the installation of the present invention. Then, according to actual needs, the position where the preloading mechanism 2 abuts against the hanging basket is adjusted. During adjustment, the structural deformation of the counterweight suspension mechanism 3 is controlled by the preloading point adjustment mechanism 4, so as to adjust the position of the preloading mechanism 2 installed on the counterweight suspension mechanism 3, and finally realize the adjustment of the position of the preloading mechanism 2 and the preloading point of the hanging basket, which is convenient for applying pressure to different positions of the hanging basket for testing and meeting the fixed-point test requirements of different positions. Moreover, a data acquisition device 1 is provided on the internal preloading mechanism 2 of the present invention. When the preloading mechanism 2 preloads the hanging basket, the displacement amount between the hanging basket and the bridge can be detected and collected by the data acquisition device 1, which is convenient for comparing and verifying the displacement amount data information with the finite element analysis result before preloading, effectively conducting the preloading test of the bridge construction hanging basket, detecting the stability of the hanging basket structure, and establishing a reference finite element model of the cantilever construction process through the finite element model correction technology. Through the numerical simulation detected by the data acquisition device 1, it is convenient to reveal the influence law of the key process of cantilever construction on the mechanical performance of the hanging basket through the analysis of the upper computer, clarify the most unfavorable pouring link, and put forward targeted construction control measures for the cantilever construction process, so as to improve the construction stability and ensure the construction effect in the subsequent cantilever construction process.

[0042] The data acquisition device 1 includes a displacement sensor, and the displacement sensor is wirelessly connected to the upper computer through a wireless communication module to transmit the collected displacement amount information of the hanging basket to the upper computer. The data acquisition device 1 also includes a pressure sensor connected to the preloading mechanism 2, and the pressure sensor is wirelessly connected to the upper computer through a wireless communication module to detect and collect the pressure applied when the preloading mechanism 2 preloads the hanging basket through the pressure sensor and transmit the pressure information to the upper computer. More stress and displacement wireless sensors can be set at key parts such as the weak points of the hanging basket under force to monitor the mechanical characteristics and their change laws of the key parts of the hanging basket during the cantilever casting simulation test construction process of the hanging basket main beam in real time, effectively control the construction risk, and ensure the construction quality.

[0043] Embodiment 2

[0044] Please refer to Figure 1-14, the counter-pressure suspension mechanism 3 includes two counter-pressure longitudinal beams 301, and more than one counter-pressure cross beam 302 is fixedly connected between the two counter-pressure longitudinal beams 301; suspension sliders 303 are slidably arranged on both of the two counter-pressure longitudinal beams 301, and one end of each of the two suspension sliders 303 is rotatably connected to one end of two counter-pressure inclined beams 304, and the other end of each of the two counter-pressure inclined beams 304 is rotatably connected to two counter-pressure sliders 305, and the two counter-pressure sliders 305 are slidably connected to two load-bearing cross beams 306; the preloading mechanism 2 is connected between the two counter-pressure sliders 305. The preloading point adjustment mechanism 4 includes two suspension lead screws, and the two suspension lead screws are rotatably connected to the two counter-pressure longitudinal beams 301 one by one; one suspension slider 303 is screwed on each suspension lead screw, and more than one pressing rod is screwed on each suspension slider 303, and the pressing rod presses against the suspension lead screw.

[0045] The working principle and technical effect of the above technical solution are as follows: Anchoring perforations are provided on both of the two counter-pressure longitudinal beams 301 for anchoring on the bridge. More than one counter-pressure cross beam 302 is fixedly connected between the two counter-pressure longitudinal beams 301 to form a stable support stress structure. When the preloading mechanism 2 preloads the hanging basket, the pressure reacts on the two counter-pressure sliders 305. The two counter-pressure sliders 305 generate pressure on the two counter-pressure inclined beams 304 and the two counter-pressure longitudinal beams 301 through the cooperation with the two load-bearing cross beams 306, so as to perform a preloading stress simulation on the hanging basket. During the test, preloading tests can also be carried out for different positions of the hanging basket. During adjustment, it is necessary to rotate the two suspension lead screws simultaneously to change the contact positions between the two suspension lead screws and the two suspension sliders 303, so as to drive the two suspension sliders 303 to slide synchronously on the two counter-pressure longitudinal beams 301, thereby driving one end of the two counter-pressure inclined beams 304 to move in the up and down directions, adjusting the included angle between the other end of the two counter-pressure inclined beams 304 and the two counter-pressure sliders 305, controlling the two counter-pressure sliders 305 to slide synchronously on the two load-bearing cross beams 306, so as to adjust the position of the preloading mechanism 2, change the preloading point, and different-sized preloading plates can also be bolted to the bottom of the preloading mechanism 2 and the preloading plates are pressed against the hanging basket, so as to change the preloading area and carry out preloading tests under different conditions.

[0046] Embodiment III

[0047] Please refer to Figure 1-14 , the counter-pressure suspension mechanism 3 further includes two strengthening cross beams 307, and the two strengthening cross beams 307 are fixedly connected to the two counter-pressure longitudinal beams 301 and are located between the two counter-pressure longitudinal beams 301; fixed anchoring holes are provided on both of the two strengthening cross beams 307, and strengthening sliding beams 308 are slidably connected to one end of the two strengthening cross beams 307 away from the two load-bearing cross beams 306, and movable anchoring holes are provided on both of the two strengthening sliding beams 308; one end of each of the two strengthening sliding beams 308 is rotatably connected to one end of two strengthening inclined beams 309, and the other end of each of the two strengthening inclined beams 309 is rotatably connected to one of the two suspension sliders 303 one by one.

[0048] The working principle and technical effects of the above technical solution are as follows: When adjusting the preloading position of the preloading mechanism 2, when the preloading mechanism 2 gradually moves away from the bridge, that is, when the preloading mechanism 2 moves away from the two counterweight longitudinal beams 301, the two suspension sliders 303 move downward on the two counterweight longitudinal beams 301, which can drive one end of the two strengthening diagonal beams 309 to move downward. The other end of the two strengthening diagonal beams 309 can drive the two strengthening sliding beams 308 to move away from the two counterweight longitudinal beams 301 on the two bearing cross beams 306, and are further anchored and fixed through the movable anchoring holes on the strengthening sliding beams 308, effectively increasing the stress area, improving the stability of the connection between the present invention and the bridge, and ensuring the stability of the present invention during the preloading construction.

[0049] Embodiment 4

[0050] Please refer to Figure 1-14 , the preloading mechanism 2 includes an upper triangular pressing frame 201 connected to the two counterweight sliding frames 305. The upper triangular pressing frame 201 is rotatably connected to the movable end of the preloading jack 202, and the fixed end of the preloading jack 202 is fixed on the lower triangular pressing frame 203; a longitudinal jacking shaft 204 is slidably connected to the lower triangular pressing frame 203. The middle part of the longitudinal jacking shaft 204 is fixedly connected to the force transmission seat 205. The force transmission seat 205 is rotatably connected to one end of the rotation control screw 206. The rotation control screw 206 is threadedly connected to the horizontal plate on the side of the lower triangular pressing frame 203; the upper end of the longitudinal jacking shaft 204 is inserted into the longitudinal insertion hole of the upper triangular pressing frame 201; the force transmission seat 205 slides on the piston cylinder of the preloading jack 202.

[0051] The working principle and technical effects of the above technical solution are as follows: After the position of the preloading mechanism 2 is adjusted, the preloading jack 202 is started. The preloading jack 202 can also be replaced by a hydraulic rod. After the preloading jack 202 is started, it generates pressure on the upper triangular pressure frame 201. At this time, the upper triangular pressure frame 201 acts on the bridge to achieve the counterpressure effect and acts on the lower triangular pressure frame 203. The lower triangular pressure frame 203 applies pressure to the hanging basket, thereby conducting a preloading test. A longitudinal top pressure shaft 204 is slidably connected to the lower triangular pressure frame 203. The middle of the longitudinal top pressure shaft 204 is fixedly connected to the force transmission seat 205. The upper end of the longitudinal top pressure shaft 204 is inserted into the longitudinal insertion hole of the upper triangular pressure frame 201. The longitudinal top pressure shaft 204 can play a certain limiting role between the upper triangular pressure frame 201 and the lower triangular pressure frame 203, preventing the upper triangular pressure frame 201 and the lower triangular pressure frame 203 from generating lateral offsets that affect the preloading effect. And during use, the contact position between the rotation control screw 206 and the side horizontal plate of the lower triangular pressure frame 203 can be changed by rotating the rotation control screw 206, thereby driving the force transmission seat 205 to slide on the piston cylinder of the preloading jack 202. The piston cylinder of the preloading jack 202 can play a guiding role to improve the stability of the up and down movement of the force transmission seat 205. When the force transmission seat 205 moves downward, the bottom of the longitudinal top pressure shaft 204 can be controlled to extend below the lower triangular pressure frame 203, so as to contact the hanging basket, facilitating the local single-point preloading test of the hanging basket to test more situations. And when the top of the longitudinal top pressure shaft 204 moves downward until it separates from the longitudinal insertion hole of the upper triangular pressure frame 201, the limit on the upper triangular pressure frame 201 and the preloading jack 202 can be released. Since the movable end of the upper triangular pressure frame 201 is rotatably connected to the preloading jack 202, the preloading jack 202 can rotate by a certain amplitude, thereby controlling the lower triangular pressure frame 203 to rotate. After the lower triangular pressure frame 203 rotates, the preloading position can be further changed, and the hanging basket can be preloaded at different angles to comprehensively test the actual state of the hanging basket under various conditions.

[0052] A longitudinal rectangular beam 207 is fixedly connected to the middle of the inner side of the upper triangular pressure frame 201. The longitudinal rectangular beam 207 divides the upper triangular pressure frame 201 into two triangular support structures; a longitudinal sliding beam 208 is slidably connected in the longitudinal sliding groove at the bottom of the longitudinal rectangular beam 207. The longitudinal sliding beam 208 is fixedly connected to the pressure seat 209. The pressure seat 209 is rotatably connected to the movable end of the preloading jack 202. A limiting rod 210 threadedly connected to the longitudinal rectangular beam 207 slides in the longitudinal sliding groove on the longitudinal sliding beam 208. When the upper surface of the longitudinal sliding beam 208 contacts the top surface of the longitudinal sliding groove, the limiting rod 210 contacts the bottom surface of the longitudinal sliding groove.

[0053] The upper rectangular beam 207 spaces the upper triangular pressure frames 201 into two triangular support structures, which is beneficial to improving the stress effect of the upper triangular pressure frames 201. When the upper surface of the longitudinal sliding beam 208 contacts the top surface of the longitudinal sliding groove, the limiting rod 210 contacts the bottom surface of the longitudinal sliding track. At this time, the movable end of the preloading jack 202 can generate pressure on the upper rectangular beam 207 and the upper triangular pressure frame 201 through the cooperation of the pressure seat 209 and the longitudinal sliding beam 208. This is used when performing reaction force jacking through the present invention. When it is necessary to conduct a suspension test by hanging counterweights, multiple counterweights are hung on the lower triangular pressure frame 203. The lower triangular pressure frame 203 generates a downward pressure under the action of the hung counterweights, thereby generating a downward pressure on the hanging basket. At this time, if the hanging basket deforms, the lower triangular pressure frame 203 will move downward. The top of the lower triangular pressure frame 203 drives the pressure seat 209 and the longitudinal sliding beam 208 to move downward through the preloading jack 202. When the longitudinal sliding beam 208 moves downward, the position of the longitudinal sliding track of the longitudinal sliding beam 208 changes relative to the limiting rod 210, causing the limiting rod 210 to gradually contact the upper part of the longitudinal sliding track of the longitudinal sliding beam 208. When the limiting rod 210 moves to the uppermost part of the longitudinal sliding track of the longitudinal sliding beam 208, the lower triangular pressure frame 203 cannot continue to move downward, thereby limiting the lowest position of the lower triangular pressure frame 203 and the counterweights hung on it. At this time, it indicates that the deformation amplitude of the hanging basket under this pressure is relatively large. The above structure can play a certain role in suspension connection, ensure construction safety, and reduce the risk of the hanging basket falling.

[0054] In the present invention, the position of the displacement sensor is not overly restricted. One setting method of the displacement sensor is that the displacement sensor is fixed on the lower triangular pressure frame 203 and is arranged facing the upper triangular pressure frame 201 to detect the relative displacement distance between the upper triangular pressure frame 201 and the lower triangular pressure frame 203, which is the relative displacement distance between the hanging basket and the bridge.

[0055] Embodiment 5

[0056] Please refer to Figure 1-14 , a lower chamber is provided at the bottom of the horizontal pressing plate 219 of the lower triangular pressure frame 203. Two L-shaped pressing plates 211 are slidably connected in the lower chamber. The vertical plates of the two L-shaped pressing plates 211 are relatively threadedly connected to the bidirectional screw 212. The lower surfaces of the horizontal plates of the two L-shaped pressing plates 211 are coplanar with the lower surface of the horizontal pressing plate 219. Both ends of the bidirectional screw 212 are rotatably connected to both ends of the horizontal pressing plate 219. The data acquisition device 1 is connected to the horizontal pressing plate 219.

[0057] The working principle and technical effects of the above technical solution are as follows: The horizontal pressing plate 219 is the bottom structure of the lower triangular pressing frame 203. The setting of this structure can, to a certain extent, change the preloading position and adjust the preloading area. During adjustment, since one end of the bidirectional screw 212 has a left-handed thread and the other end has a right-handed thread, rotating the bidirectional screw 212 can drive the vertical plates of the two L-shaped pressing plates 211 to slide towards or away from each other in the lower cavity. When the vertical plates of the two L-shaped pressing plates 211 slide away from each other, the horizontal plates of the two L-shaped pressing plates 211 extend outside the lower cavity, expanding the contact area between the lower triangular pressing frame 203 and the hanging basket. Conversely, the contact area between the lower triangular pressing frame 203 and the hanging basket is reduced, meeting the test requirements in different situations.

[0058] A plurality of longitudinal threaded interfaces 213 are provided on the horizontal plates of the two L-shaped pressing plates 211. Each longitudinal threaded interface 213 is internally threaded with a longitudinal suspension pipe 214. A counterweight water bag 215 is fixedly connected to the bottom of each longitudinal suspension pipe 214. A gear 216 is fixedly connected to the outer end of the bidirectional screw 212. The gear 216 meshes with a rack 218 fixedly connected to the movable end of the hydraulic rod 217. The fixed end of the hydraulic rod 217 is fixed on the side surface of the horizontal pressing plate 219, and the rack 218 slides in a rectangular sliding sleeve on the side surface of the horizontal pressing plate 219.

[0059] A plurality of longitudinal threaded interfaces 213 are provided on the horizontal plates of the two L-shaped pressing plates 211. By providing a plurality of longitudinal threaded interfaces 213, a plurality of weights can be connected. In the present invention, it is preferably a counterweight water bag 215. The longitudinal suspension pipe 214 on the counterweight water bag 215 is threadedly connected to the longitudinal threaded interface 213, which is convenient for disassembly or installation. And when the horizontal plates of the two L-shaped pressing plates 211 extend outside the lower cavity, the plurality of longitudinal threaded interfaces 213 can be located outside the lower cavity. At this time, a water pipe can be connected above the longitudinal threaded interface 213 to inject water into the counterweight water bag 215, and the water pipe can be inserted into the counterweight water bag 215, which is convenient for injecting or pumping water to adjust the water volume inside the counterweight water bag 215 and change the counterweight. The counterweight water bag 215 is made of an elastic material, can expand and deform after being filled with water, and has a high bearing capacity and will not burst easily;

[0060] In order to further increase the stability of the hanging basket under different conditions, in the present invention, a hydraulic rod 217 is also fixedly connected to the side surface of the horizontal pressure plate 219. When the hydraulic rod 217 is activated, it can drive the rack 218 to slide in the rectangular sliding sleeve on the side surface of the horizontal pressure plate 219, so as to control the contact between the rack 218 at different positions and the gear 216, and can control the gear 216 to rotate clockwise and counterclockwise reciprocally, so that the gear 216 drives the bidirectional screw rod 212 to rotate clockwise and counterclockwise reciprocally. By driving the two L-shaped pressure plates 211 to slide continuously in the inner and outer directions through the bidirectional screw rod 212. At this time, the horizontal plate of the L-shaped pressure plate 211 is at the gap of the hanging basket and will not interfere with the hanging basket and cannot move. Since the counterweight water bag 215 is made of an elastic material and is filled with counterweight liquid inside, it can swing by a certain amplitude, thereby forming a traction effect on the hanging basket in an unstable state and can simulate the stress conditions of the hanging basket in more cases.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 to the present invention.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, 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 situations.

[0063] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. The preloading test system for the bridge construction hanging basket based on finite element simulation is characterized in that, Including: A preloading test device and a data acquisition device; The preloading test device includes a preloading mechanism for preloading the hanging basket; the preloading mechanism is connected to the counterweight suspension mechanism, and the preloading point adjustment mechanism is connected to the counterweight suspension mechanism; The data acquisition device is connected to the preloading mechanism to detect and collect the displacement between the hanging basket and the bridge when the preloading mechanism preloads the hanging basket; The counterweight suspension mechanism includes two counterweight longitudinal beams, and more than one counterweight cross beam is fixedly connected between the two counterweight longitudinal beams; suspension sliders are slidably arranged on both of the two counterweight longitudinal beams, one ends of two suspension sliders are rotatably connected to one ends of two counterweight inclined beams, the other ends of the two counterweight inclined beams are rotatably connected to two counterweight sliding frames, and the two counterweight sliding frames are slidably connected to two bearing cross beams; The preloading mechanism includes an upper triangular pressing frame connected to the two counterweight sliding frames, the upper triangular pressing frame is rotatably connected to the movable end of the preloading jack, and the fixed end of the preloading jack is fixed on the lower triangular pressing frame; a longitudinal top pressing shaft is slidably connected to the lower triangular pressing frame, the middle of the longitudinal top pressing shaft is fixedly connected to a force transmission seat, the force transmission seat is rotatably connected to one end of a rotation control screw, and the rotation control screw is threadedly connected to a transverse plate on the side of the lower triangular pressing frame; the upper end of the longitudinal top pressing shaft is inserted into the longitudinal insertion hole of the upper triangular pressing frame; A lower chamber is arranged at the bottom of the horizontal pressing plate of the lower triangular pressing frame, two L-shaped pressing plates are slidably connected in the lower chamber, the vertical plates of the two L-shaped pressing plates are relatively threadedly connected to a bidirectional screw, and both ends of the bidirectional screw are rotatably connected to both ends of the horizontal pressing plate; a plurality of longitudinal threaded interfaces are arranged on the transverse plates of the two L-shaped pressing plates, a longitudinal suspension pipe is threadedly connected in each longitudinal threaded interface, and a counterweight water bag is fixedly connected to the bottom of each longitudinal suspension pipe; a gear is fixedly connected to the outer end of the bidirectional screw, the gear is meshed with a rack fixedly connected to the movable end of a hydraulic rod, the fixed end of the hydraulic rod is fixed on the side surface of the horizontal pressing plate, and the rack is slidably arranged in a rectangular sliding sleeve on the side surface of the horizontal pressing plate; The hydraulic rod drives the rack to slide in the rectangular sliding sleeve on the side surface of the horizontal pressing plate, the rack controls the gear to drive the bidirectional screw to rotate, the bidirectional screw drives the two L-shaped pressing plates to slide continuously in the inner and outer directions, so that the counterweight water bags filled with counterweight liquid swing by a certain amplitude, forming an unstable state traction on the hanging basket.

2. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 1, characterized in that, The data acquisition device includes a displacement sensor, and the displacement sensor is wirelessly connected to a host computer through a wireless communication module to transmit the collected displacement information of the hanging basket to the host computer.

3. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 2, wherein, The data acquisition device further includes a pressure sensor connected to the preloading mechanism, and the pressure sensor is wirelessly connected to the host computer through a wireless communication module to detect and collect the pressure applied when the preloading mechanism preloads the hanging basket through the pressure sensor and transmit the pressure information to the host computer.

4. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 1, characterized in that The preloading point adjustment mechanism includes two hanging screws, and the two hanging screws are rotatably connected to the two counterweight longitudinal beams one by one; a suspension slider is screwed on each hanging screw, and more than one pressing rod is screwed on each suspension slider, and the pressing rod presses against the hanging screw.

5. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 1, wherein The backpressure suspension mechanism further includes two reinforcing crossbeams, which are fixedly connected to the two backpressure longitudinal beams and located between the two backpressure longitudinal beams; fixed anchoring holes are provided on both of the two reinforcing crossbeams, and reinforcing sliding beams are slidably connected to one ends of the two reinforcing crossbeams away from the two load-bearing crossbeams, and movable anchoring holes are provided on both of the two reinforcing sliding beams; one ends of the two reinforcing sliding beams are rotatably connected to one ends of the two reinforcing inclined beams, and the other ends of the two reinforcing inclined beams are rotatably connected to the two suspension sliding seats one by one.

6. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 5, characterized in that, A rectangular upper beam is fixedly connected to the middle of the inner side of the upper triangular pressure frame, and the upper triangular pressure frame is separated into two triangular support structures by the rectangular upper beam; a longitudinal sliding beam is slidably connected in the longitudinal chute at the bottom of the rectangular upper beam, the longitudinal sliding beam is fixedly connected to the pressure seat, the pressure seat is rotatably connected to the movable end of the preloading jack, and a limiting rod threadedly connected to the rectangular upper beam slides in the longitudinal slideway on the longitudinal sliding beam. When the upper surface of the longitudinal sliding beam contacts the top surface of the longitudinal chute, the limiting rod contacts the bottom surface of the longitudinal slideway.

7. The preloading test system for the bridge construction hanging basket based on finite element simulation according to claim 6, characterized in that, The lower surfaces of the horizontal plates of the two L-shaped pressing plates are coplanar with the lower surface of the horizontal pressing plate; the data acquisition device is connected to the horizontal pressing plate.

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