Door frame safety control system of double-main-beam three-door-frame suspension grouting bridge fabrication machine

Abstract

The invention belongs to the technical field of bridge construction equipment, and particularly relates to a double-girder three-gantry suspension grouting bridge fabrication machine gantry safety control system which comprises a bridge fabrication machine body. According to the portal safety control system of the double-girder three-portal suspension grouting bridge fabrication machine, by arranging the pressure adjustment driving mechanism, the tension adjustment mechanism and the monitoring control mechanism, when the portal safety control system is used, the working states of the two girders and the three portal frames on the bridge fabrication machine body are automatically monitored through the monitoring control mechanism and fed back to the PLC; and then a pressure adjusting driving mechanism and a tension adjusting mechanism are automatically controlled to work through a PLC, so that the problems that an existing traditional suspension grouting bridge fabrication machine adopts a single-main-beam structure, the bearing capacity and torsional rigidity are limited, main beam deformation in the construction process is easily caused, bridge linear control is affected, and a traditional portal frame is single in structure, insufficient in supporting stability and poor in stability are solved. And particularly, the overturning risk exists in the process of crossing complex terrains or large-span construction.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction equipment, and particularly to a gantry safety control system for a double-girder three-gantry cantilever bridge building machine. Background Art

[0002] Traditional cantilever bridge building machines mostly adopt a single-girder structure, with limited load-bearing capacity and torsional stiffness, which easily leads to deformation of the main girder during construction and affects the control of the bridge alignment. Moreover, the traditional gantry structure is single and the support stability is insufficient. Especially when crossing complex terrains or during large-span construction, there is a risk of overturning. In order to overcome the above technical problems, a double-girder three-gantry cantilever bridge building machine is used for complex terrain or large-span construction in the prior art. The double-girder three-gantry cantilever bridge building machine is composed of two steel structure main girders, three gantries, a traveling system, a formwork system, a suspension system, and a protection system.

[0003] During specific construction, the two main girders provide the main load-bearing capacity and structural stability for the entire equipment. The three gantries are respectively located at both ends and the middle position of the main girder, used to support the main girder and suspend relevant construction equipment, ensuring the overall stability of the bridge building machine during construction. The traveling system provides the moving ability for the bridge building machine during construction, enabling it to move longitudinally along the bridge and realizing the conversion of different construction positions. The formwork system is used to form the formwork for bridge concrete pouring, ensuring that the shape and size of the concrete pouring meet the design requirements. The suspension system is the suspension system. The protection system provides safety protection for construction workers and reduces potential safety hazards during construction.

[0004] Although the setting of the double main girders and three gantries enhances the load-bearing capacity and torsional stiffness of the main girder structure and the stability of the gantry structure support, there is still a problem that during complex terrain or large-span construction, the two main girders and the gantries of the formwork system, suspension system, and protection system cannot be safely monitored, resulting in the inability to timely adjust and strengthen the forces on the main girder and gantry, and there is still a risk of overturning.

[0005] Therefore, a gantry safety control system for a double-girder three-gantry cantilever bridge building machine is needed. Summary of the Invention

[0006] Based on the technical problems of the existing traditional cantilever bridge building machines that adopt a single-girder structure with limited load-bearing capacity and torsional stiffness, which easily leads to deformation of the main girder during construction and affects the control of the bridge alignment, and the traditional gantry structure is single and the support stability is insufficient, especially when crossing complex terrains or during large-span construction, there is a risk of overturning, the present invention proposes a gantry safety control system for a double-girder three-gantry cantilever bridge building machine.

[0007] A gantry safety control system for a double-main girder three-gantry suspended casting bridge machine proposed by the present invention includes a bridge machine body, and the bridge machine body is composed of two steel structure main girders, three gantries, a traveling system, a formwork system, a suspension system and a protection system. A pressure adjustment driving mechanism is arranged on the upper surface of the bridge machine body, a tension adjustment mechanism is arranged above the pressure adjustment driving mechanism, and a monitoring and control mechanism is arranged on the surface of the tension adjustment mechanism.

[0008] The monitoring and control mechanism is composed of a PLC controller, an inclination sensor electrically connected to the PLC controller, and a tension sensor electrically connected to the PLC controller.

[0009] Among them, the pressure adjustment driving mechanism is used to drive the tension adjustment mechanism to move and adjust the pressure center.

[0010] Among them, the tension adjustment mechanism is used to perform tension adjustment on the gantry.

[0011] Among them, the monitoring and control mechanism is used to monitor the levels of the two main girders of the bridge machine and the tension of the tension adjustment mechanism, and automatically control the operation of the pressure adjustment driving mechanism and the tension adjustment mechanism.

[0012] Preferably, the pressure adjustment driving mechanism includes a reinforced load-bearing beam. The three reinforced load-bearing beams are located between the two main girders of the bridge machine body, and both ends of the reinforced load-bearing beam are fixedly connected to the side surfaces of the two gantries of the bridge machine body respectively.

[0013] Linear guide rails and a driving frame are fixedly connected to the upper surface of the reinforced load-bearing beam respectively. The two linear guide rails are symmetrically distributed with the axis of the driving frame as the center, and a slider seat for connecting and supporting the tension adjustment mechanism is slidably connected to the surface of the linear guide rail.

[0014] Preferably, a moving driving motor is fixedly installed at one end of the driving frame, and the moving driving motor is electrically connected to the PLC controller through a cable.

[0015] A driving lead screw is rotatably connected to the inner wall of the driving frame through a bearing, and one end of the driving lead screw is fixedly connected to the output shaft of the moving driving motor through a coupling.

[0016] Limit guide rods are fixedly connected to the inner wall of the driving frame. The two limit guide rods are symmetrically distributed with the axis of the driving frame as the center, and a driving seat is slidably connected to the surface of the limit guide rod through a linear bearing. The surface of the driving seat is threadedly connected to the surface of the driving lead screw.

[0017] Preferably, the tensioning and adjusting mechanism includes a tensioning workbench, the PLC controller is fixedly installed on one side surface of the tensioning workbench, and the lower surface of the tensioning workbench is fixedly connected to the upper surfaces of the two slider seats and one driving seat.

[0018] Preferably, a double-output reduction gear is fixedly installed on the upper surface of the tensioning workbench, a tensioning driving motor is fixedly installed on the surface of the double-output reduction gear, the tensioning driving motor is electrically connected to the PLC controller through a cable, and the output shaft of the tensioning driving motor is fixedly connected to the power input end of the double-output reduction gear.

[0019] Two right-angle steering gears symmetrically distributed with the axis of the double-output reduction gear as the center are fixedly installed on the upper surface of the tensioning workbench. Both reduction output ends of the double-output reduction gear are fixedly connected with driving shafts. First cable winding wheels are fixedly installed on the surfaces of the two driving shafts, and one ends of the two driving shafts are respectively fixedly connected to the power input ends of the two right-angle steering gears.

[0020] Preferably, the power output shafts of the right-angle steering gears are fixedly connected with driving sprockets. A transmission wheel shaft is rotatably connected to the surface of the tensioning workbench through a bearing. The two transmission wheel shafts are symmetrically distributed with the axis of the tensioning workbench as the center. One end of the transmission wheel shaft is fixedly connected with a driven sprocket. The two driving sprockets are in transmission connection with the two driven sprockets through chains.

[0021] One end of the transmission wheel shaft penetrates and extends to the inner wall of the tensioning workbench. One end of the rotating wheel shaft is fixedly connected with a driving bevel gear. A driven bevel gear is meshed with the surface of the driving bevel gear. A cable winding shaft is fixedly connected to the surface of the driven bevel gear.

[0022] Preferably, fixed bearing seats are fixedly installed on the inner wall of the tensioning workbench. Both ends of the two cable winding shafts are rotatably connected to the surface of the fixed bearing seat and the inner wall of the tensioning workbench through bearings. A second cable winding wheel is fixedly connected to the surface of the cable winding shaft.

[0023] Preferably, a first adjusting hydraulic cylinder and a second adjusting hydraulic cylinder are respectively fixedly installed on the surfaces of the two gantries at both ends of the bridge erector body. The two first adjusting hydraulic cylinders and the two second adjusting hydraulic cylinders are symmetrically distributed with the axis of the tensioning workbench as the center. The first adjusting hydraulic cylinder and the second adjusting hydraulic cylinder are both electrically connected to the PLC controller through solenoid valves. The first adjusting hydraulic cylinder and the second adjusting hydraulic cylinder respectively include a first adjusting hydraulic rod and a second adjusting hydraulic rod.

[0024] One end of the first adjusting hydraulic rod and one end of the second adjusting hydraulic rod are both fixedly installed with steel cable guide wheels. The steel cables on the first steel cable winding wheel and the second steel cable winding wheel are fixedly connected to the surfaces of the two gantries at both ends of the bridge erector body through the steel cable guide wheels.

[0025] Preferably, a plurality of the inclination sensors are respectively installed on the surfaces of the two main girders and the three gantries of the bridge erector body. Two adjacent inclination sensors are arranged at a ninety-degree angle. Four tension sensors are respectively fixedly installed on the steel cables between the two first steel cable winding wheels, the two second steel cable winding wheels, the two first adjusting hydraulic cylinders, and the two second adjusting hydraulic cylinders.

[0026] Preferably, it includes the following steps:

[0027] Step 1: First, arrange a plurality of the inclination sensors on the two main girders and the three gantries of the bridge erector body. Then, connect the steel cables on the first steel cable winding wheel and the second steel cable winding wheel to the two gantries at both ends of the bridge erector body, and make the surface of the steel cable slidably connected to the steel cable guide wheels on the first adjusting hydraulic rod and the second adjusting hydraulic rod. Then, install the four tension sensors on the four steel cables, and then perform program setting on the PLC controller.

[0028] Step 2: When the bridge segment is suspended and cast with concrete on the bridge erector body, tension and assist in strengthening the gantries at both ends of the bridge erector body through the four steel cables. During the concrete pouring process, real-time monitor the inclination angles of the two main girders and the three gantries through a plurality of the inclination sensors.

[0029] Step 3: After the data monitored by the inclination sensors on the two main girders and the three gantries reaches the threshold set by the PLC controller, the PLC controller automatically controls the pressure regulating drive mechanism and the tensioning regulating mechanism to work.

[0030] Step 4: During the adjustment process, the pressure regulating drive mechanism drives the tensioning regulating mechanism to move, adjusts the position of the tensioning workbench on the strengthening load-bearing beam. By changing the position of the tensioning workbench on the strengthening load-bearing beam, cooperate with the tensioning regulating mechanism to adjust the center of gravity of the tensioning pressure, and prevent the bridge erector body from overturning towards the concrete pouring end.

[0031] During the adjustment, the PLC controller automatically controls the mobile drive motor to rotate forward or backward, drives the drive lead screw to rotate. The drive lead screw drives the drive seat to move along the two limit guide rods, drives the tensioning workbench and the slider seat to move on the linear guide rail, and drives the tensioning workbench to perform linear movement to adjust the position of the tensioning workbench between the two gantries.

[0032] Step 5: While moving and adjusting the tensioning center of gravity on the tensioning workbench, the PLC controls the automatic operation of the tensioning drive motor, cooperating with the forward or reverse rotation of the moving drive motor. The tensioning drive motor drives the two drive shafts and the two first steel cable winding wheels to rotate through the double-output reduction gearbox. The two drive shafts simultaneously drive the two driving sprockets to rotate through the two right-angle steering gears. The two driving sprockets drive the two driven sprockets to rotate through a chain. The two driven sprockets drive the two transmission wheel shafts to rotate. The two transmission wheel shafts drive the two driving bevel gears to rotate. The two driving bevel gears drive the two driven bevel gears to rotate. The two driven bevel gears drive the two steel cable winding shafts to rotate. The two steel cable winding shafts drive the two second steel cable winding wheels to rotate, realizing that while the two first steel cable winding wheels unwind the steel cable, the two second steel cable winding wheels simultaneously wind the steel cable, or while the two first steel cable winding wheels wind the steel cable, the two second steel cable winding wheels simultaneously unwind the steel cable.

[0033] Step 6: When the first steel cable winding wheel and the second steel cable winding wheel wind and unwind the steel cable, the tension sensor on the steel cable monitors the tension of the steel cable in real time and feeds it back to the PLC controller. When the tension of the steel cable is abnormal, the PLC controller automatically controls the operation of the two first adjusting hydraulic cylinders and the two second adjusting hydraulic cylinders. By controlling the extension or contraction of the first adjusting hydraulic rod and the second adjusting hydraulic rod, the steel cable guiding wheel is driven to move, adjusting the tension of the steel cable to ensure sufficient tensile force on the gantry and prevent the risk of overturning of the bridge erector body.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. By setting up a pressure regulating drive mechanism, a tensioning regulating mechanism, and a monitoring and control mechanism, during use, the monitoring and control mechanism automatically monitors the working states of the two main girders and the three gantries on the bridge erector body and feeds them back to the PLC controller. Then, the PLC controller automatically controls the operation of the pressure regulating drive mechanism and the tensioning regulating mechanism to assist in tensioning the gantries on the bridge erector body, applying pressure to the two main girders, and adjusting the pressure center of gravity, preventing the risk of overturning of the bridge erector body during the concrete pouring process. Thus, it solves the problems that the existing traditional suspended casting bridge erector adopts a single main girder structure with limited load-bearing capacity and torsional stiffness, which is prone to deformation of the main girder during the construction process, affecting the bridge alignment control, and the traditional gantry structure is single with insufficient support stability, especially when crossing complex terrains or during large-span construction, there is a risk of overturning.

[0036] 2. By setting up a pressure regulating drive mechanism and a tensioning regulating mechanism, during use, the tensioning regulating mechanism can assist in tensioning the gantry on the bridge building machine body, improving the safety performance of the gantry. The pressure regulating drive mechanism drives the tensioning workbench to move. The tensioning workbench cooperates with the tensioning steel cable to apply a downward pressure on the two main girders of the bridge building machine body, preventing the main girders from tipping over at the concrete pouring end. By adjusting the position of the tensioning workbench, the center of pressure is adjusted, thereby achieving a better anti-tipping control and adjustment effect on the bridge building machine body. Description of the Drawings

[0037] Figure 1 Schematic diagram of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0038] Figure 2 Schematic diagram of the structure of the bridge building machine body of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0039] Figure 3 For a gantry safety control system of a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention Figure 2 Enlarged view of the structure at A in;

[0040] Figure 4 Stereogram of the structure of the reinforced load-bearing beam of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0041] Figure 5 Stereogram of the structure of the drive frame of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0042] Figure 6 Stereogram of the structure of the tensioning workbench of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0043] Figure 7 Stereogram of the structure of the double-output reduction gear of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention;

[0044] Figure 8 Stereogram of the structure of the first adjusting hydraulic cylinder of a gantry safety control system for a double-main-girder three-gantry suspended casting bridge building machine proposed by the present invention.

[0045] In the figure: 1. The main body of the bridge-building machine; 2. The pressure adjustment driving mechanism; 201. The reinforced load-bearing beam; 202. The linear guide rail; 203. The driving frame; 204. The slider seat; 205. The moving driving motor; 206. The driving lead screw; 207. The limit guiding rod; 208. The driving seat; 3. The tensioning adjustment mechanism; 301. The tensioning workbench; 302. The double-output reduction gear; 303. The tensioning driving motor; 304. The right-angle steering gear; 305. The driving shaft; 306. The first steel cable winding wheel; 307. The driving sprocket; 308. The transmission wheel shaft; 309. The driven sprocket; 310. The driving bevel gear; 311. The driven bevel gear; 312. The steel cable winding shaft; 313. The fixed bearing seat; 314. The second steel cable winding wheel; 315. The first adjusting hydraulic cylinder; 316. The second adjusting hydraulic cylinder; 317. The first adjusting hydraulic rod; 318. The second adjusting hydraulic rod; 319. The steel cable guiding wheel; 4. The monitoring and control mechanism; 401. The PLC controller; 402. The inclination sensor; 403. The tension sensor. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0047] Refer to Figures 1-8 , a gantry safety control system for a double-girder three-gantry suspended casting bridge-building machine, including the main body 1 of the bridge-building machine. The main body 1 of the bridge-building machine is composed of two steel structure main girders, three gantries, a traveling system, a formwork system, a suspension system, and a protection system. A pressure adjustment driving mechanism 2 is arranged on the upper surface of the main body 1 of the bridge-building machine. A tensioning adjustment mechanism 3 is arranged above the pressure adjustment driving mechanism 2. A monitoring and control mechanism 4 is arranged on the surface of the tensioning adjustment mechanism 3.

[0048] The monitoring and control mechanism 4 is composed of a PLC controller 401, an inclination sensor 402 electrically connected to the PLC controller 401, and a tension sensor 403 electrically connected to the PLC controller 401.

[0049] Among them, the pressure adjustment driving mechanism 2 is used to drive the tensioning adjustment mechanism 3 to move and adjust the pressure center.

[0050] The pressure adjustment driving mechanism 2 includes a reinforced load-bearing beam 201. The three reinforced load-bearing beams 201 are located between the two main girders of the main body 1 of the bridge-building machine. The two ends of the reinforced load-bearing beam 201 are respectively fixedly connected to the side surfaces of the two gantries of the main body 1 of the bridge-building machine.

[0051] The upper surfaces of the reinforced load-bearing beams 201 are respectively fixedly connected with linear guide rails 202 and a driving frame 203. The two linear guide rails 202 are symmetrically distributed with the axis of the driving frame 203 as the center. A slider seat 204 for connecting the supporting and tensioning adjustment mechanism 3 is slidably connected to the surface of the linear guide rail 202.

[0052] One end of the driving frame 203 is fixedly installed with a moving driving motor 205, and the moving driving motor 205 is electrically connected to the PLC controller 401 through a cable.

[0053] The inner wall of the driving frame 203 is rotatably connected with a driving lead screw 206 through a bearing. One end of the driving lead screw 206 is fixedly connected to the output shaft of the moving driving motor 205 through a coupling.

[0054] During use, the PLC controller 401 automatically controls the operation of the moving driving motor 205, and the output shaft of the moving driving motor 205 drives the driving lead screw 206 to rotate through a coupling.

[0055] The inner wall of the driving frame 203 is fixedly connected with limit guiding rods 207. The two limit guiding rods 207 are symmetrically distributed with the axis of the driving frame 203 as the center. A driving seat 208 is slidably connected to the surface of the limit guiding rod 207 through a linear bearing, and the surface of the driving seat 208 is threadedly connected to the surface of the driving lead screw 206.

[0056] During use, the rotation of the driving lead screw 206 drives the driving seat 208 to perform a linear motion along the surfaces of the two limit guiding rods 207.

[0057] Among them, the tensioning adjustment mechanism 3 is used to perform tensioning adjustment on the gantry.

[0058] The tensioning adjustment mechanism 3 includes a tensioning workbench 301. The PLC controller 401 is fixedly installed on one side surface of the tensioning workbench 301. The lower surface of the tensioning workbench 301 is fixedly connected to the upper surfaces of the two slider seats 204 and a driving seat 208.

[0059] During use, the PLC controller 401 automatically controls the operation of the moving driving motor 205. The output shaft of the moving driving motor 205 drives the driving lead screw 206 to rotate through a coupling. The driving lead screw 206 drives the driving seat 208 to move, driving the tensioning workbench 301 to perform a linear movement to adjust the position of the tensioning workbench 301 between the two gantries.

[0060] A double-output reduction gear 302 is fixedly installed on the upper surface of the tensioning workbench 301. A tensioning driving motor 303 is fixedly installed on the surface of the double-output reduction gear 302. The tensioning driving motor 303 is electrically connected to the PLC controller 401 through a cable, and the output shaft of the tensioning driving motor 303 is fixedly connected to the power input end of the double-output reduction gear 302.

[0061] On the upper surface of the tensioning workbench 301, two right-angle steering gears 304 symmetrically distributed with the axis of the double-output reduction gear 302 as the center are fixedly installed. Both reduction output ends of the double-output reduction gear 302 are fixedly connected with drive shafts 305. On the surfaces of the two drive shafts 305, first steel cable winding wheels 306 are fixedly installed. One ends of the two drive shafts 305 are respectively fixedly connected with the power input ends of the two right-angle steering gears 304.

[0062] During use, the PLC controller 401 automatically controls the tensioning drive motor 303 to work. The tensioning drive motor 303 drives the two drive shafts 305 to rotate through the double-output reduction gear 302, and the two drive shafts 305 drive the two right-angle steering gears 304 to work.

[0063] Power output shafts of the right-angle steering gears 304 are all fixedly connected with driving sprockets 307. On the surface of the tensioning workbench 301, a transmission wheel shaft 308 is rotatably connected through a bearing. The two transmission wheel shafts 308 are symmetrically distributed with the axis of the tensioning workbench 301 as the center. One end of the transmission wheel shaft 308 is fixedly connected with a driven sprocket 309. The two driving sprockets 307 are in transmission connection with the two driven sprockets 309 through chains.

[0064] During use, the two right-angle steering gears 304 drive the two driving sprockets 307 to rotate. The two driving sprockets 307 drive the two driven sprockets 309 to rotate through the chains, and the two driven sprockets 309 drive the two transmission wheel shafts 308 to rotate.

[0065] One end of the transmission wheel shaft 308 penetrates and extends to the inner wall of the tensioning workbench 301. One end of the rotating wheel shaft is fixedly connected with a driving bevel gear 310. A driven bevel gear 311 is meshed on the surface of the driving bevel gear 310. A steel cable winding shaft 312 is fixedly connected to the surface of the driven bevel gear 311.

[0066] During use, the driving bevel gear 310 is driven to rotate through the transmission wheel shaft 308. The driving bevel gear 310 drives the driven bevel gear 311 to rotate, and the driven bevel gear 311 drives the steel cable winding shaft 312 to rotate.

[0067] Fixed bearing seats 313 are fixedly installed on the inner wall of the tensioning workbench 301. Both ends of the two steel cable winding shafts 312 are rotatably connected to the surface of the fixed bearing seat 313 and the inner wall of the tensioning workbench 301 through bearings. A second steel cable winding wheel 314 is fixedly connected to the surface of the steel cable winding shaft 312.

[0068] In use, the two cable take-up reels 312 are rotatably connected to the fixed bearing seats 313 through bearings, and the fixed bearing seats 313 provide rotational support for the two cable take-up reels 312, so as to better realize the rotation of the two cable take-up reels 312 to drive the two second cable take-up wheels 314 to rotate, and achieve the effect of winding and unwinding the cable.

[0069] On the surfaces of the two gantries at both ends of the bridge erector body 1, a first adjusting hydraulic cylinder 315 and a second adjusting hydraulic cylinder 316 are respectively fixedly installed. The two first adjusting hydraulic cylinders 315 and the two second adjusting hydraulic cylinders 316 are symmetrically distributed with the axis of the tensioning workbench 301 as the center. The first adjusting hydraulic cylinder 315 and the second adjusting hydraulic cylinder 316 are both electrically connected to the PLC controller 401 through solenoid valves. The first adjusting hydraulic cylinder 315 and the second adjusting hydraulic cylinder 316 respectively include a first adjusting hydraulic rod 317 and a second adjusting hydraulic rod 318.

[0070] Furthermore, the first adjusting hydraulic cylinder 315 and the second adjusting hydraulic cylinder 316 are also connected to the hydraulic pump station through solenoid valves and hydraulic oil pipes, and the hydraulic pump station is also electrically connected to the PLC controller 401 through cables.

[0071] In use, the PLC controller 401 automatically controls the operation of the hydraulic pump station, and automatically controls the on-off of the solenoid valves on the first adjusting hydraulic cylinder 315 and the second adjusting hydraulic cylinder 316, and controls the first adjusting hydraulic rod 317 and the second adjusting hydraulic rod 318 in the first adjusting hydraulic cylinder 315 and the second adjusting hydraulic cylinder 316 to extend or contract.

[0072] A cable guide wheel 319 is fixedly installed at one end of the first adjusting hydraulic rod 317 and one end of the second adjusting hydraulic rod 318. The cables on the first cable take-up wheel 306 and the second cable take-up wheel 314 are fixedly connected to the surfaces of the two gantries at both ends of the bridge erector body 1 through the cable guide wheel 319.

[0073] Among them, the monitoring and control mechanism 4 is used to monitor the levels of the two main girders of the bridge erector and the tension of the tensioning and adjusting mechanism 3, and automatically control the operation of the pressure regulating drive mechanism 2 and the tensioning and adjusting mechanism 3.

[0074] A plurality of inclination sensors 402 are respectively installed on the surfaces of the two main girders and the three gantries of the bridge erector body 1. Two adjacent inclination sensors 402 are arranged at a ninety-degree angle. Four tension sensors 403 are respectively fixedly installed on the cables between the two first cable take-up wheels 306, the two second cable take-up wheels 314, the two first adjusting hydraulic cylinders 315 and the two second adjusting hydraulic cylinders 316.

[0075] During use, multiple inclination sensors 402 measure the inclination angles of the two main girders and three gantry frames of the bridge building machine body 1. The two adjacent sensors among the multiple inclination sensors 402 are arranged at a 90-degree angle to monitor the multi-angle inclination and levelness of the two main girders and three gantry frames after stress, and feedback the monitoring data to the PLC controller 401, facilitating the PLC controller 401 to automatically control the pressure regulating drive mechanism 2 and the tensioning regulating mechanism 3 to automatically adjust the pressure and tension, preventing the bridge building machine from tipping over.

[0076] By setting up the pressure regulating drive mechanism 2 and the tensioning regulating mechanism 3, during use, the tensioning regulating mechanism 3 provides tensioning assistance to the gantry frames on the bridge building machine body 1, improving the safety performance of the gantry frames. The pressure regulating drive mechanism 2 drives the tensioning workbench 301 to move. The tensioning workbench 301 cooperates with the tensioning steel cables to apply a downward pressure to the two main girders on the bridge building machine body 1, preventing the main girders from tipping over from the concrete pouring end. By moving and adjusting the tensioning workbench 301, the pressure application center of gravity is adjusted, thereby achieving a better anti-tipping control and adjustment effect on the bridge building machine body 1.

[0077] Specifically, a gantry safety control system for a double-main-girder three-gantry cantilever bridge building machine includes the following steps:

[0078] Step 1: First, arrange multiple inclination sensors 402 on the two main girders and three gantry frames of the bridge building machine body 1. Then, connect the steel cables on the first steel cable reel 306 and the second steel cable reel 314 to the two gantry frames at both ends of the bridge building machine body 1, and make the surface of the steel cable slide-connected to the steel cable guide wheels 319 on the first adjusting hydraulic rod 317 and the second adjusting hydraulic rod 318. Then, install four tension sensors 403 on the four steel cables, and then perform program setting on the PLC controller 401.

[0079] Furthermore, during the implementation process, it also includes calculating the pre-tension of the steel cable. The formula is: F_pre = k * (G_bridge building machine + G_concrete), where F_pre is the pre-tension, k is the safety factor (usually taken as 1.5 - 2.0), G_bridge building machine is the self-weight of the bridge building machine, and G_concrete is the weight of the concrete. When installing the tension sensors 403, record the initial tension value as the reference value for subsequent monitoring.

[0080] Step 2: When the bridge building machine body 1 is performing cantilever pouring of bridge segments with concrete, use the four steel cables to provide tensioning assistance and reinforcement to the gantry frames at both ends of the bridge building machine body 1. During the concrete pouring process, use multiple inclination sensors 402 to continuously monitor the inclination angles of the two main girders and three gantry frames.

[0081] Further, during the implementation process, during the concrete pouring process, the data of the inclination sensor 402 is monitored in real time, and the inclination change rate is calculated. The formula is θ = (αcurrent - αinitial) / Δt, where θ is the inclination change rate, αcurrent is the current inclination, αinitial is the initial inclination, and Δt is the time interval. According to the inclination change rate, it is judged whether it is necessary to start the tensioning adjustment mechanism 3.

[0082] Step 3: After the data monitored by the inclination sensors 402 on the two main girders and the three gantries reach the threshold set by the PLC controller 401, the PLC controller 401 automatically controls the pressure adjustment drive mechanism 2 and the tensioning adjustment mechanism 3 to work.

[0083] Further, during the implementation process, the formula for calculating the threshold set by the PLC controller 401 is: θthreshold = θsafety * ksafety, where θthreshold is the threshold, θsafety is the safety inclination, and ksafety is the safety factor (generally taken as 1.1 - 1.2). When the data monitored by the inclination sensor 402 reaches the threshold, the PLC controller 401 starts the pressure adjustment drive mechanism 2 and the tensioning adjustment mechanism 3.

[0084] Step 4: During the adjustment process, the pressure adjustment drive mechanism 2 drives the tensioning adjustment mechanism 3 to move, adjusts the position of the tensioning workbench 301 on the reinforced load-bearing beam 201, and by changing the position of the tensioning workbench 301 on the reinforced load-bearing beam 201, coordinates with the tensioning adjustment mechanism 3 to adjust the tensioning pressure center of gravity to prevent the bridge erector body 1 from tipping over towards the concrete pouring end.

[0085] During the adjustment, the PLC controller 401 automatically controls the mobile drive motor 205 to rotate forward or backward, drives the drive lead screw 206 to rotate, the drive lead screw 206 drives the drive seat 208 to move along the two limit guide rods 207, drives the tensioning workbench 301 and the slider seat 204 to move on the linear guide rail 202, and drives the tensioning workbench 301 to perform a linear movement to adjust the position of the tensioning workbench 301 between the two gantries.

[0086] Further, during the implementation process, the formula for calculating the optimal position of the tensioning workbench 301 on the reinforced load-bearing beam 201 is: Loptimal = (Gbridge erector * Lbridge erector) / (2 * Ftensioning), where Loptimal is the optimal position of the tensioning workbench 301, Lbridge erector is the length of the bridge erector, and Ftensioning is the tensioning force. Adjust the position of the tensioning workbench 301 to make the tensioning pressure center of gravity coincide with the center of gravity of the bridge erector.

[0087] Step 5: While the tensioning workbench 301 moves to adjust the tensioning center of gravity, the PLC controls the automatic operation of the tensioning drive motor 303, and cooperates with the forward or reverse rotation of the moving drive motor 205. The tensioning drive motor 303 drives two drive shafts 305 and two first steel cable winding wheels 306 to rotate through a double-output reduction gear 302. The two drive shafts 305 simultaneously drive two driving sprockets 307 to rotate through two right-angle steering gears 304. The two driving sprockets 307 drive two driven sprockets 309 to rotate through a chain. The two driven sprockets 309 drive two transmission wheel shafts 308 to rotate. The two transmission wheel shafts 308 drive two driving bevel gears 310 to rotate. The two driving bevel gears 310 drive two driven bevel gears 311 to rotate. The two driven bevel gears 311 drive two steel cable winding shafts 312 to rotate. The two steel cable winding shafts 312 drive two second steel cable winding wheels 314 to rotate. When the two first steel cable winding wheels 306 unwind the steel cable, the two second steel cable winding wheels 314 synchronously wind the steel cable, or when the two first steel cable winding wheels 306 wind the steel cable, the two second steel cable winding wheels 314 synchronously unwind the steel cable.

[0088] Further, during the implementation process, calculate the working parameters of the tensioning drive motor 303. The formula is: n = (60 * η * P) / (2 * π * T), where n is the motor speed, η is the transmission efficiency, P is the power, and T is the torque. By controlling the forward and reverse rotation of the tensioning drive motor 303 and the moving drive motor 205, the winding and unwinding of the steel cable are realized.

[0089] Step 6: When the first steel cable winding wheel 306 and the second steel cable winding wheel 314 wind and unwind the steel cable, the tension sensor 403 on the steel cable monitors the tension of the steel cable in real time and feeds it back to the PLC controller 401. When the tension of the steel cable is abnormal, the PLC controller 401 automatically controls the operation of two first adjusting hydraulic cylinders 315 and two second adjusting hydraulic cylinders 316. By controlling the extension or contraction of the first adjusting hydraulic rod 317 and the second adjusting hydraulic rod 318, the steel cable guiding wheel 319 is driven to move, and the tension of the steel cable is adjusted to ensure sufficient tensile force on the gantry and prevent the risk of overturning of the bridge erector body 1.

[0090] Further, during the implementation process, monitor the steel cable tension in real time and calculate the tension deviation. The formula is: ΔF = Fcurrent - Freference, where ΔF is the tension deviation, Fcurrent is the current tension, and Freference is the reference tension. When the tension deviation exceeds the set value, the PLC controller 401 automatically adjusts the hydraulic cylinder and calculates the hydraulic cylinder adjustment amount. The formula is: ΔL = ΔF / (A * E), where ΔL is the hydraulic cylinder adjustment amount, A is the piston area of the hydraulic cylinder, and E is the elastic modulus of the hydraulic oil.

[0091] By setting up a pressure regulating drive mechanism 2, a tensioning regulating mechanism 3 and a monitoring and control mechanism 4, during use, the monitoring and control mechanism 4 automatically monitors the working states of the two main girders and the three gantry frames on the bridge building machine body 1, and feeds them back to the PLC controller 401. Then, the PLC controller 401 automatically controls the pressure regulating drive mechanism 2 and the tensioning regulating mechanism 3 to work, to assist in tensioning the gantry frames on the bridge building machine body 1, apply pressure to the two main girders and adjust the pressure center of gravity, so as to prevent the risk of overturning of the bridge building machine body 1 during the process of pouring concrete, thus solving the problems that the existing traditional suspended casting bridge building machine adopts a single main girder structure, with limited load-bearing capacity and torsional stiffness, which is prone to cause deformation of the main girder during the construction process, affecting the bridge alignment control, and the traditional gantry frame structure is single, with insufficient support stability, especially when spanning complex terrains or in large-span construction, there is a risk of overturning.

[0092] As described above, only the preferred specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A gantry safety control system for a double-main girder three-gantry suspended casting bridge building machine, comprising a bridge building machine body (1), wherein the bridge building machine body (1) is composed of two steel structure main girders, three gantries, a walking system, a formwork system, a suspension system and a protection system, and is characterized in that: A pressure regulating drive mechanism (2) is provided on the upper surface of the bridge building machine body (1), a tensioning regulating mechanism (3) is provided above the pressure regulating drive mechanism (2), and a monitoring and control mechanism (4) is provided on the surface of the tensioning regulating mechanism (3); The monitoring and control mechanism (4) is composed of a PLC controller (401), an inclination sensor (402) electrically connected to the PLC controller (401), and a tension sensor (403) electrically connected to the PLC controller (401); Wherein, the pressure regulating drive mechanism (2) is used to drive the tensioning regulating mechanism (3) to move and adjust the pressure center; Wherein, the tensioning regulating mechanism (3) is used to perform tensioning adjustment on the gantry; Wherein, the monitoring and control mechanism (4) is used to monitor the horizontal of the two main beams of the bridge building machine and the tension of the tensioning regulating mechanism (3), and automatically control the operation of the pressure regulating drive mechanism (2) and the tensioning regulating mechanism (3).

2. The gantry safety control system of a double-main girder three-gantry suspended casting bridge machine according to claim 1, characterized in that: The pressure regulating drive mechanism (2) includes a reinforced load-bearing beam (201). Three of the reinforced load-bearing beams (201) are located between the two main beams of the bridge building machine body (1), and both ends of the reinforced load-bearing beam (201) are fixedly connected to the side surfaces of the two gantries of the bridge building machine body (1); Linear guide rails (202) and a drive frame (203) are respectively fixedly connected to the upper surface of the reinforced load-bearing beam (201). The two linear guide rails (202) are symmetrically distributed with the axis of the drive frame (203) as the center. A slider seat (204) for connecting and supporting the tensioning regulating mechanism (3) is slidably connected to the surface of the linear guide rail (202).

3. The safety control system for the gantry of a double-main girder three-girder suspended casting bridge machine according to claim 2, characterized in that: A mobile drive motor (205) is fixedly installed at one end of the drive frame (203), and the mobile drive motor (205) is electrically connected to the PLC controller (401) through a cable; The inner wall of the drive frame (203) is rotatably connected to a drive lead screw (206) through a bearing, and one end of the drive lead screw (206) is fixedly connected to the output shaft of the mobile drive motor (205) through a coupling; A limit guide rod (207) is fixedly connected to the inner wall of the drive frame (203). The two limit guide rods (207) are symmetrically distributed with the axis of the drive frame (203) as the center. A drive seat (208) is slidably connected to the surface of the limit guide rod (207) through a linear bearing, and the surface of the drive seat (208) is threadedly connected to the surface of the drive lead screw (206).

4. A gantry safety control system for a double-main girder three-gantry suspended casting bridge machine according to claim 3, characterized in that: The tensioning regulating mechanism (3) includes a tensioning workbench (301). The PLC controller (401) is fixedly installed on one side surface of the tensioning workbench (301). The lower surface of the tensioning workbench (301) is fixedly connected to the upper surfaces of the two slider seats (204) and one drive seat (208).

5. The safety control system for the gantry of a double-main girder and three-girder suspended casting bridge machine according to claim 4, wherein: A double-output speed reducer (302) is fixedly installed on the upper surface of the tensioning workbench (301). A tensioning drive motor (303) is fixedly installed on the surface of the double-output speed reducer (302). The tensioning drive motor (303) is electrically connected to the PLC controller (401) through a cable. The output shaft of the tensioning drive motor (303) is fixedly connected to the power input end of the double-output speed reducer (302). Two right-angle steering gears (304) symmetrically distributed around the axis of the double-output speed reducer (302) are fixedly installed on the upper surface of the tensioning workbench (301). Driving shafts (305) are fixedly connected to the two deceleration output ends of the double-output speed reducer (302). First steel cable winding wheels (306) are fixedly installed on the surfaces of the two driving shafts (305). One ends of the two driving shafts (305) are respectively fixedly connected to the power input ends of the two right-angle steering gears (304).

6. The safety control system for the gantry of a double-main girder three-girder suspended casting bridge machine according to claim 5, characterized in that: Power output shafts of the right-angle steering gears (304) are fixedly connected with driving sprockets (307). A transmission wheel shaft (308) is rotatably connected to the surface of the tensioning workbench (301) through a bearing. The two transmission wheel shafts (308) are symmetrically distributed around the axis of the tensioning workbench (301). A driven sprocket (309) is fixedly connected to one end of the transmission wheel shaft (308). The two driving sprockets (307) are in transmission connection with the two driven sprockets (309) through chains. One end of the transmission wheel shaft (308) penetrates and extends to the inner wall of the tensioning workbench (301). A driving bevel gear (310) is fixedly connected to one end of the rotating wheel shaft. A driven bevel gear (311) is meshed with the surface of the driving bevel gear (310). A steel cable winding shaft (312) is fixedly connected to the surface of the driven bevel gear (311).

7. A gantry safety control system for a double-main girder three-girder suspended casting bridge building machine according to claim 6, characterized in that: A fixed bearing seat (313) is fixedly installed on the inner wall of the tensioning workbench (301). Two ends of the two steel cable winding shafts (312) are respectively rotatably connected to the surface of the fixed bearing seat (313) and the inner wall of the tensioning workbench (301) through bearings. A second steel cable winding wheel (314) is fixedly connected to the surface of the steel cable winding shaft (312).

8. A gantry safety control system for a double-main girder three-girder suspended casting bridge construction machine according to claim 7, characterized in that: First adjusting hydraulic cylinders (315) and second adjusting hydraulic cylinders (316) are respectively fixedly installed on the surfaces of two gantries at both ends of the bridge erector body (1). The two first adjusting hydraulic cylinders (315) and the two second adjusting hydraulic cylinders (316) are symmetrically distributed around the axis of the tensioning workbench (301). The first adjusting hydraulic cylinders (315) and the second adjusting hydraulic cylinders (316) are both electrically connected to the PLC controller (401) through solenoid valves. The first adjusting hydraulic cylinders (315) and the second adjusting hydraulic cylinders (316) respectively include first adjusting hydraulic rods (317) and second adjusting hydraulic rods (318). One end of the first adjusting hydraulic rod (317) and one end of the second adjusting hydraulic rod (318) are both fixedly installed with cable wire wheels (319). The cables on the first cable winding wheel (306) and the second cable winding wheel (314) are fixedly connected to the surfaces of the two gantries at both ends of the bridge erector body (1) through the cable wire wheels (319).

9. A gantry safety control system for a double-girder three-gantry suspended casting bridge machine according to claim 8, characterized in that: A plurality of the inclination sensors (402) are respectively installed on the surfaces of the two main girders and the three gantries of the bridge erector body (1). Two adjacent inclination sensors (402) are arranged at a right angle. Four tension sensors (403) are respectively fixedly installed on the cables between the two first cable winding wheels (306), the two second cable winding wheels (314), the two first adjusting hydraulic cylinders (315) and the two second adjusting hydraulic cylinders (316).

10. A gantry safety control system for a double-main girder three-gantry suspended casting bridge machine according to claim 9, characterized in that, It includes the following steps: Step 1: First, arrange a plurality of the inclination sensors (402) on the two main girders and the three gantries of the bridge erector body (1). Then connect the cables on the first cable winding wheel (306) and the second cable winding wheel (314) to the two gantries at both ends of the bridge erector body (1), and make the surface of the cable slide-connected to the cable wire wheels (319) on the first adjusting hydraulic rod (317) and the second adjusting hydraulic rod (318). Then install the four tension sensors (403) on the four cables, and then perform program setting on the PLC controller (401); Step 2: When the bridge erector body (1) is performing suspension casting of bridge segments, use the four cables to perform tensioning and auxiliary strengthening on the gantries at both ends of the bridge erector body (1). During the concrete pouring process, use a plurality of the inclination sensors (402) to monitor the inclination angles of the two main girders and the three gantries in real time; Step 3: After the data monitored by the inclination sensors (402) on the two main girders and the three gantries reaches the threshold set by the PLC controller (401), the PLC controller (401) automatically controls the pressure regulating drive mechanism (2) and the tensioning regulating mechanism (3) to work; Step 4: During the adjustment process, the pressure regulating drive mechanism (2) drives the tensioning regulating mechanism (3) to move, adjusts the position of the tensioning workbench (301) on the strengthening load-bearing beam (201), and by changing the position of the tensioning workbench (301) on the strengthening load-bearing beam (201), cooperate with the tensioning regulating mechanism (3) to adjust the tensioning pressure center of gravity to prevent the bridge erector body (1) from tipping over towards the concrete pouring end; During adjustment, the PLC controller (401) automatically controls the forward or reverse rotation of the mobile drive motor (205), drives the drive lead screw (206) to rotate, the drive lead screw (206) drives the drive seat (208) to move along the two limit guide rods (207), drives the tensioning workbench (301) and the slider seat (204) to move on the linear guide rail (202), and drives the tensioning workbench (301) to perform a linear movement to adjust the position of the tensioning workbench (301) between the two gantries; Step Five: While the tensioning workbench (301) is moving to adjust the tensioning center of gravity, the PLC automatically controls the tensioning drive motor (303) to work, cooperating with the forward or reverse rotation of the mobile drive motor (205). The tensioning drive motor (303) drives the two drive shafts (305) and the two first wire rope winding wheels (306) to rotate through the double-output reduction gearbox (302). The two drive shafts (305) simultaneously drive the two driving sprockets (307) to rotate through the two right-angle steering gears (304). The two driving sprockets (307) drive the two driven sprockets (309) to rotate through a chain. The two driven sprockets (309) drive the two transmission wheel shafts (308) to rotate. The two transmission wheel shafts (308) drive the two driving bevel gears (310) to rotate. The two driving bevel gears (310) drive the two driven bevel gears (311) to rotate. The two driven bevel gears (311) drive the two wire rope winding shafts (312) to rotate. The two wire rope winding shafts (312) drive the two second wire rope winding wheels (314) to rotate, realizing that while the two first wire rope winding wheels (306) unwind the wire rope, the two second wire rope winding wheels (314) synchronously wind the wire rope, or while the two first wire rope winding wheels (306) wind the wire rope, the two second wire rope winding wheels (314) synchronously unwind the wire rope; Step Six: When the first wire rope winding wheel (306) and the second wire rope winding wheel (314) are winding and unwinding the wire rope, the tension sensor (403) on the wire rope monitors the tension of the wire rope in real time and feeds it back to the PLC controller (401). When the wire rope tension is abnormal, the PLC controller (401) automatically controls the two first adjusting hydraulic cylinders (315) and the two second adjusting hydraulic cylinders (316) to work, and drives the wire rope guide wheel (319) to move by controlling the extension or contraction of the first adjusting hydraulic rod (317) and the second adjusting hydraulic rod (318), adjusts the tension of the wire rope, ensures sufficient tensile force on the gantry, and prevents the risk of overturning of the bridge erector body (1).

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