Steel truss girder pushing and deviation correction system and construction method

Abstract

The present invention belongs to the field of bridge construction, and specifically relates to a jacking deviation correction system and construction method for a steel truss girder. A torsion device is installed on the main truss at the top of the steel truss girder; an adjustable laser emitting device is provided at the rear end of the steel truss girder, and the adjustable laser emitting device can adjust the distance from the side of the steel truss girder and the pitching angle; light-sensitive induction rulers are arranged on the platforms on both sides at the front end of the steel truss girder, and the light-sensitive induction rulers sense the laser emitted by the adjustable laser emitting device to judge whether the steel truss girder and the guide girder are offset; a controller is installed beside the light-sensitive induction ruler, and the controller receives the offset signal of the adjustable laser emitting device and outputs a signal to the torsion device to control the torsion device to provide torsion for the steel truss girder. The present invention controls the rotation speeds of the motor and the flywheel through the deflection value of the steel truss girder, accurately controls the torque reaction force, thereby controlling the pressure difference between the left and right sides of the steel truss girder, and is not prone to excessive deviation correction.

Description

Technical Field

[0001] The present invention belongs to the field of bridge construction, and particularly relates to a jacking deviation correction system and construction method for a steel truss girder. Background Art

[0002] During the jacking process of a steel truss girder, usually two sets of jacking cylinders are used for jacking on both sides. For large steel truss girders, multiple sets of cylinders may be used for jacking. To maintain balance, the steel truss girder must be corrected during the jacking process to solve the left-right deviation caused by factors such as differences in contact surface friction coefficients, differences in jacking forces, and large displacements of the steel truss girder under the action of stress, temperature difference, etc. during the jacking process.

[0003] The existing deviation correction devices and technologies are of the following types:

[0004] 1. Using a device (such as a horizontal cylinder) to apply a lateral force to the steel truss girder when it is stationary, so that the steel truss girder is straightened to achieve the deviation correction effect.

[0005] 2. Using a device (such as a horizontal cylinder) to apply a lateral force to the steel truss girder during the jacking process, so that the steel truss girder is straightened to achieve the deviation correction effect.

[0006] 3. Adjusting the thrust of the jacking cylinders on both sides of the steel truss girder, and straightening the steel truss girder by controlling the unilateral speed to achieve the deviation correction effect.

[0007] 4. Changing the friction coefficient on one side of the steel truss girder (such as applying grease) to straighten the steel truss girder to achieve the deviation correction effect.

[0008] The above traditional deviation correction measures have the following limitations:

[0009] 1. Both the first type and the second type directly apply a lateral force for deviation correction. When correcting the deviation, the steel truss girder moves laterally from a stationary state to a starting state, and the force required for starting is much greater than the force required for continuous deviation correction after starting. Therefore, it is necessary to reduce the lateral force applied to the steel truss girder within a short time after the steel truss girder starts, and the control difficulty is large, and it is very easy to over-correct the deviation.

[0010] 2. Both the first type and the second type of deviation correction affect the normal jacking of the steel truss girder and affect the jacking progress.

[0011] 3. The third type uses the measure of adjusting the thrust of the jacking cylinders on both sides of the steel truss girder for deviation correction, and it is necessary to repeatedly adjust the thrust of the jacking cylinders on both sides, which interferes with the normal jacking and affects the jacking progress.

[0012] 4. Changing the friction coefficient on one side of the steel truss girder is likely to cause a sudden change in the attitude of the steel truss girder because the changed value is not easily smoothed and controlled.

[0013] Therefore, it is extremely important to study a steel truss girder jacking deviation correction system and construction method that do not affect the normal jacking operation of the steel truss girder, are not prone to excessive deviation correction, and do not cause sudden changes in the attitude of the steel truss girder. Summary of the Invention

[0014] The purpose of the present invention is to provide a steel truss girder jacking deviation correction system and construction method that do not affect the normal jacking operation of the steel truss girder, are not prone to excessive deviation correction, and do not cause sudden changes in the attitude of the steel truss girder.

[0015] The present invention adopts the following technical solutions: A steel truss girder jacking deviation correction system includes permanent piers and temporary supports. Slide bars are erected on the permanent piers and temporary supports. A steel truss girder and a guide girder that can slide along the slide bars are arranged on the slide bars. The bottom of the steel truss girder and the guide girder are connected to the slide bars through sliders. Limiting and locking devices are arranged on both sides of the steel truss girder and the guide girder. Counterweights are arranged on the steel truss girder and the guide girder. A jacking jack reaction frame is arranged on the permanent pier in front of the steel truss girder and the guide girder. A jacking jack is arranged on the reaction frame. A rear anchor block is arranged at the end of the steel truss girder. One end of the steel strand is anchored on the jacking jack, and the other end is anchored on the rear anchor block. The jacking jack extends to pull the steel strand, thereby driving the steel truss girder and the guide girder to move forward; A torsion device is installed on the main truss at the top of the steel truss girder; An adjustable laser emitting device is arranged at the rear end of the steel truss girder. The adjustable laser emitting device can adjust the distance and pitching angle between it and the side of the steel truss girder; Light-sensitive induction rulers are arranged on the platforms on both sides at the front end of the steel truss girder. The light-sensitive induction rulers sense the laser emitted by the adjustable laser emitting device to judge whether the steel truss girder and the guide girder are offset; A controller is installed beside the light-sensitive induction ruler. The controller receives the offset signal of the adjustable laser emitting device and outputs a signal to the torsion device to control the torsion device to provide torsion to the steel truss girder.

[0016] The torsion device includes a torsion large arm installed on the main truss of the steel truss girder. A large arm reserved groove is arranged on the torsion large arm. A torsion small arm sleeved inside the torsion large arm. A small arm reserved groove is arranged on the torsion small arm. The width of the large arm reserved groove is the same as that of the small arm reserved groove. A fastening bolt is installed in the large arm reserved groove and the small arm reserved groove. The torsion large arm and the torsion small arm are fixed through the fastening bolt. A base is installed at the front end of the torsion small arm. A motor and a gearbox connected to it are installed on the base. The gearbox is connected to a flywheel.

[0017] A rear baffle and a front baffle are installed under the torsion large arm. A triangular brace is installed between the torsion large arm and the rear baffle and the front baffle. The rear baffle and the front baffle are both provided with reserved grooves. The fastening bolt is connected to the bottom baffle and installed in the reserved grooves of the rear baffle and the front baffle. Inner liners are lined inside the rear baffle, the front baffle, and the bottom baffle, and the entire torsion device is fixed on the upper main truss of the steel truss girder.

[0018] The adjustable laser emission device includes a bracket, a mounting table, a bottom plate, a laser pen adjusting bracket, a laser pen holder, a laser pen and a laser pen adjusting bolt. The bracket is fixed to the lower part of the steel truss beam through a bracket fastening bolt. The mounting table is fixed on the bracket. The mounting table is provided with 2 reserved slots, and each reserved slot is provided with scales. The bottom plate is mounted on the mounting table and can slide along the reserved slots on the mounting table and is fixed through a fastening bolt. The bottom plate is provided with 2 laser pen adjusting bolts at the positions of the 2 reserved slots. A laser pen adjusting bracket is fixed on the laser pen adjusting bolt. A laser pen holder and a spirit level are fixed on the laser pen adjusting bracket. The laser pen is fixed in the laser pen holder.

[0019] The light-sensitive ruler includes a light-sensitive ruler bracket and a light-sensitive ruler body. The light-sensitive ruler body is fixed on the light-sensitive ruler bracket. The light-sensitive ruler body includes a light-sensitive ruler frame. A series of light-sensitive resistors arranged in the horizontal direction are provided on the light-sensitive ruler frame, and a filter plate is covered on the series of light-sensitive resistors.

[0020] The spectral characteristics of the series of light-sensitive resistors and the color of the filter plate correspond to the laser color and wavelength of the laser pen.

[0021] The series of light-sensitive resistors includes a central point light-sensitive resistor located at the central position, a plurality of left light-sensitive resistors and a plurality of right light-sensitive resistors located on both sides.

[0022] A construction method of a steel truss beam jacking deviation correction system includes the following steps:

[0023] S100 - Construction preparation, install all the structures of the system in place;

[0024] S200 - Debug the system;

[0025] S300 - Jacking operation.

[0026] Turn on the controller and turn on the laser pen. At this time, the laser pen irradiates the light-sensitive resistor at the center point of the light-sensitive ruler. Turn on the jacking jack and perform normal jacking.

[0027] During the jacking operation, if the steel truss girder deflects to the left, the beam of the laser pen in the adjustable laser emission device fixed on the steel truss girder will shift to the left. The controller input end receives the signal that the resistance value of a photosensitive resistance with a certain number on the left side of the photosensitive ruler becomes smaller, and controls the motor of the torque device to rotate counterclockwise. The flywheel of all torque devices is driven to rotate counterclockwise through the gearbox. The counterclockwise rotating flywheel generates a clockwise torque reaction force, which is transmitted to the steel truss girder through the large torque arm and the small torque arm, reducing the pressure of the left side of the steel truss girder on the lower slider and increasing the pressure of the right side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the left side of the steel truss girder is smaller than that on the right side. Under the action of the jacking jack of the steel truss girder, the forward speed of the left side of the steel truss girder will be greater than that of the right side, and the steel truss girder will gradually deflect to the right until the laser beam of the laser pen of the adjustable laser emission device shines on the center point of the photosensitive ruler, the steel truss girder is repositioned correctly, and the deviation correction ends. The controller controls the motor of the torque device to stop rotating.

[0028] During the jacking operation, if the steel truss girder deflects to the right, the beam of the laser pen in the adjustable laser emission device fixed on the steel truss girder will shift to the right. The controller input end receives the signal that the resistance value of a photosensitive resistance with a certain number on the left side of the photosensitive ruler becomes smaller, and controls the motor of the torque device to rotate clockwise. The flywheel of all torque devices is driven to rotate clockwise through the gearbox. The clockwise rotating flywheel generates a counterclockwise torque reaction force, which is transmitted to the steel truss girder through the large torque arm and the small torque arm, reducing the pressure of the right side of the steel truss girder on the lower slider and increasing the pressure of the left side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the right side of the steel truss girder is smaller than that on the left side. Under the action of the jacking jack of the steel truss girder, the forward speed of the right side of the steel truss girder will be greater than that of the left side, and the steel truss girder will gradually deflect to the left until the laser beam of the laser pen of the adjustable laser emission device shines on the center point of the photosensitive ruler, the steel truss girder is repositioned correctly, and the deviation correction ends. The controller controls the motor of the torque device to stop rotating.

[0029] The specific steps of step S100 include

[0030] S101: Install the temporary support of the steel truss girder, the jacking jack, the steel strand, the steel truss girder and the guide beam according to the conventional construction plan, and then install the torque device, the adjustable laser emission device, the photosensitive ruler and the controller, and connect the photosensitive ruler and the torque device to the input and output ends of the controller respectively.

[0031] S102: Adjust the extension length of the small torque arm of all torque devices in the large torque arm to make the lengths of all torque devices equal, and then fix them.

[0032] S103: Adjust the laser pen adjustment bolt to make the bubble of the spirit level on the laser pen adjustment frame centered, and the laser pen on the laser pen adjustment frame is horizontal.

[0033] S104 - Turn on the laser pointer, loosen the fastening bolt, adjust the position of the base plate so that the distance from the laser pointer to the steel truss beam is the same as the distance from the center point of the light - sensitive ruler to the steel truss beam, make the laser pointer irradiate the center point of the light - sensitive ruler, and then fix the fastening bolt.

[0034] The specific steps of step S200 include

[0035] S201 - Turn on the controller, remove the laser pointer from the laser - pointer bracket, manually irradiate the right - hand series of light - sensitive resistors with the laser pointer from the center to the right in turn, simulate the state that the steel truss beam gradually deflects to the right, observe the rotation direction and rotation speed of the flywheel of the torsion device. If the flywheel rotates clockwise and the rotation speed increases from slow to fast, it indicates that the right - hand deflection is normal.

[0036] S202 - Manually irradiate the right - hand series of light - sensitive resistors with the laser pointer from the right to the center in turn, simulate the state that the steel truss beam gradually returns to the normal position from the right - hand deflection, observe the rotation direction and rotation speed of the flywheel of the torsion device. If the flywheel rotates clockwise and the rotation speed decreases from fast to slow, it indicates that the right - hand deflection returns to normal.

[0037] S203 - Manually irradiate the left - hand series of light - sensitive resistors with the laser pointer from the center to the left in turn, simulate the state that the steel truss beam gradually deflects to the left, observe the rotation direction and rotation speed of the flywheel of the torsion device. If the flywheel rotates counter - clockwise and the rotation speed increases from slow to fast, it indicates that the left - hand deflection is normal.

[0038] S204 - Manually irradiate the left - hand series of light - sensitive resistors with the laser pointer from the left to the center in turn, simulate the state that the steel truss beam gradually returns to the normal position from the left - hand deflection, observe the rotation direction and rotation speed of the flywheel of the torsion device. If the flywheel rotates counter - clockwise and the rotation speed decreases from fast to slow, it indicates that the left - hand deflection returns to normal.

[0039] S205 - After debugging the system without problems, reinstall the laser pointer to the laser - pointer bracket, and then the formal jacking operation can be carried out.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. Flexible control, and the deviation - rectifying effect can be quickly reflected on the steel truss beam.

[0042] 2. Precise control, control the rotation speed of the motor and the flywheel through the deflection value of the steel truss beam, precisely control the torque reaction force, so as to control the pressure difference between the left and right sides of the steel truss beam, and it is not easy to over - correct.

[0043] 3. It does not directly affect the attitude of the steel truss beam, so it is not easy to produce sudden changes during the deviation - rectifying process.

[0044] 4. It does not affect the normal jacking operation of the steel truss beam.

[0045] 5. The rectification process is automatically controlled by the controller according to the deflection value of the steel truss girder without manual intervention. Description of the Drawings

[0046] Figure 1 is the existing steel truss girder jacking structure Figure 1 ;

[0047] Figure 2 is the front view of the existing steel truss girder jacking structure;

[0048] Figure 3 is the existing steel truss girder jacking structure Figure 2 ;

[0049] Figure 4 is the side view of the existing steel truss girder jacking structure;

[0050] Figure 5 is the installation position diagram of the rectification system;

[0051] Figure 6 is the installation diagram of the torsion device;

[0052] Figure 7 is the structural diagram of the torsion device;

[0053] Figure 8 is the structural diagram of the torsion device;

[0054] Figure 9 is the installation diagram of the adjustable laser emission device;

[0055] Figure 10 is the structural diagram of the adjustable laser emission device;

[0056] Figure 11 is the installation position diagram of the light-sensitive ruler and the controller;

[0057] Figure 12 is the structural diagram of the light-sensitive ruler;

[0058] In the figure: A - permanent pier, B - temporary support, C - slide bar, D - slider, E - limit and locking device, F - steel truss girder, G - guide beam, H - counterweight, I - reaction frame of the jacking jack, J - jacking jack, K - steel strand, L - rear anchor block;

[0059] 1 - torsion device, 2 - adjustable laser emission device, 3 - light-sensitive ruler, 4 - controller;

[0060] 1.1 - Torque big arm, 1.2 - Big arm reserved slot, 1.3 - Torque small arm, 1.4 - Small arm reserved slot, 1.5 - Fastening bolt, 1.6 - Base, 1.7 - Motor, 1.8 - Gearbox, 1.9 - Flywheel, 1.10 - Rear baffle, 1.11 - Inner gasket, 1.12 - Triangular brace, 1.13 - Fastening bolt, 1.14 - Front baffle, 1.15 - Bottom baffle, 1.16 - Baffle reserved slot;

[0061] 2.1 - Bracket, 2.2 - Installation table, 2.3 - Reserved slot, 2.4 - Scale, 2.5 - Base plate, 2.6 - Fastening bolt, 2.7 - Laser pen adjustment bracket, 2.8 - Level, 2.9 - Laser pen bracket, 2.10 - Laser pen, 2.11 - Laser pen adjustment bolt, 2.12 - Bracket fastening bolt, 2.13 - Bolt washer;

[0062] 3.1 - Photosensitive ruler bracket, 3.2 - Photosensitive ruler body;

[0063] 3.2.1 - Photosensitive ruler frame, 3.2.2 - Filter plate, 3.2.3 - Photosensitive resistor;

[0064] Series photosensitive resistor numbers:

[0065] 3.2.3.1 - Center point photosensitive resistor, 3.2.3.I.1 - Left - numbered 1 photosensitive resistor, 3.2.3.I.2 - Left - numbered 2 photosensitive resistor, 3.2.3.I.N - Left - numbered N photosensitive resistor -

[0066] 3.2.3.II.1 - Right - numbered 1 photosensitive resistor, 3.2.3.II.2 - Right - numbered 2 photosensitive resistor, 3.2.3.II.N - Right - numbered N photosensitive resistor. Specific implementation method

[0067] Such as Figures 1 to 4As shown in the figure, the traditional incremental launching of steel truss girders generally consists of the following parts: permanent pier A, temporary support B, slide bar C, slider D, limit and locking device E, steel truss girder F, guide girder G, counterweight H, incremental launching jack reaction frame I, incremental launching jack J, steel strand K, and rear anchor block L. During incremental launching, when the incremental launching jack J extends, the steel truss girder F and the guide girder G are driven forward by the steel strand K anchored to the rear anchor block L, and finally the steel truss girder F crosses obstacles such as the railway or highway in front. During the incremental launching process, there will inevitably be differences in the frictional forces between the two or three main trusses (three in this embodiment) of the steel truss girder F and the guide girder G and the slider D. There are also differences in the two or more groups (four in this embodiment) of incremental launching jacks J used for incremental launching. The steel truss girder F and the guide girder G themselves will also have slight deformations due to factors such as temperature and stress. The superposition of various factors will cause the attitude of the steel truss girder to deviate during the incremental launching process, and in severe cases, accidents will occur. Therefore, during the incremental launching process, it is necessary to correct the attitude deviation of the steel truss girder in a timely manner.

[0068] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0069] A steel truss girder incremental launching deviation correction system described in the present invention includes a torsion device 1 installed on the main truss at the top of the steel truss girder F, an adjustable laser emitting device 2 fixed to the lower main truss at the rear of the steel truss girder F, a light-sensitive ruler 3 installed on the platform beside the front of the steel truss girder F, and a controller 4 installed beside the light-sensitive ruler 3. The construction method is a method for incremental launching construction based on the steel truss girder incremental launching deviation correction system.

[0070] As Figure 5 shown, the torsion devices 1 are symmetrically installed in groups on the main truss at the top of the steel truss girder F, and the specific quantity depends on the size and weight of the main truss F (six groups and twelve in total are installed in this embodiment). The adjustable laser emitting device 2 is fixed to the lower main truss at the rear of the steel truss girder F. The light-sensitive ruler 3 is installed on the platform beside the front of the steel truss girder F, and the controller 4 is installed beside the light-sensitive ruler 3.

[0071] As Figures 6 to 8As shown in the figure, the torsion device 1 includes a large torsion arm 1.1. There is a reserved groove 1.2 on the large torsion arm 1.1. A small torsion arm 1.3 is arranged inside the large torsion arm 1.1. The small torsion arm 1.3 is provided with a reserved groove 1.4. The width of the reserved groove 1.2 on the large torsion arm is the same as that of the reserved groove 1.4 on the small torsion arm. The large torsion arm 1.1 and the small torsion arm 1.3 are fixed by a fastening bolt 1.5. The fastening bolt 1.5 is installed in the reserved groove 1.2 on the large torsion arm and the reserved groove 1.4 on the small torsion arm. A base 1.6 is installed at the front end of the small torsion arm 1.3. An electric motor 1.7 and a gearbox 1.8 are installed thereon. The gearbox 1.8 is connected to a flywheel 1.9. A rear baffle 1.10 and a front baffle 1.14 are installed under the large torsion arm 1.1. A triangular brace 1.12 is additionally installed between the large torsion arm 1.1, the rear baffle 1.10 and the front baffle 1.14. The rear baffle 1.10 and the front baffle 1.14 are both provided with a reserved groove 1.16. A fastening bolt 1.13 is connected to a bottom baffle 1.15 and installed in the reserved groove 1.16 of the rear baffle 1.10 and the front baffle 1.14. Inner liners 1.11 are lined inside the rear baffle 1.10, the front baffle 1.14 and the bottom baffle 1.15, and the entire torsion device 1 is fixed on the upper main truss of the steel truss beam F.

[0072] To reduce the weight, the large torsion arm 1.1, the small torsion arm 1.3, the base 1.6, the rear baffle 1.10, the front baffle 1.14 and the bottom baffle 1.15 can all be made of aluminum alloy material. To increase the inertia, the flywheel 1.9 is made of steel and is in the shape of a circular ring.

[0073] As Figures 9 to 10 As shown in the figure, the adjustable laser emission device 2 is composed of a bracket 2.1, an installation platform 2.2, a reserved groove 2.3, a scale 2.4, a bottom plate 2.5, a fastening bolt 2.6, a laser pen adjusting frame 2.7, a spirit level 2.8, a laser pen bracket 2.9, a laser pen 2.10, a laser pen adjusting bolt 2.11, a bracket fastening bolt 2.12 and a bolt washer 2.13. Among them, the bracket 2.1 is fixed to the lower part of the steel truss beam F through the bracket fastening bolt 2.12. The installation platform 2.2 is fixed on the bracket 2.1. The installation platform 2.2 is provided with 2 reserved grooves 2.3, and each reserved groove 2.3 is provided with a scale. A bottom plate 2.5 is installed on the installation platform 2.2. The installation bottom plate 2.5 can slide along the reserved groove 2.3 on the installation platform 2.2 and is fixed by a fastening bolt 2.6. The installation bottom plate 2.5 is provided with 2 laser pen adjusting bolts 2.11 at the positions of the 2 reserved grooves 2.3. A laser pen adjusting frame 2.7 is fixed on the adjusting bolt 2.11. A laser pen bracket 2.9 and a spirit level 2.8 are fixed thereon. The laser pen 2.10 is fixed in the laser pen bracket 2.9.

[0074] By adjusting the position of the installation bottom plate 2.5, the horizontal distance between the laser pen 2.10 and the steel truss beam F is controlled. By adjusting the 2 laser pen adjusting bolts 2.11, the pitching angle of the laser pen 2.10 is controlled.

[0075] As Figure 11 shown in Figure 11 , the photosensitive ruler 3 is composed of a photosensitive ruler bracket 3.1 and a photosensitive ruler body 3.2. The photosensitive ruler body 3.2 is composed of a photosensitive ruler frame 3.2.1, a filter plate 3.2.2 and a series of photosensitive resistors 3.2.3.

[0076] As Figure 12 shown in Figure 12 , the numbering rule of the series of photosensitive resistors is as follows:

[0077] The number of the photosensitive resistor at the center point is 3.2.3.1. Facing the advancing direction of the steel truss beam F, the number of the first photosensitive resistor on the right side in sequence is 3.2.3.I.1, the number of the second photosensitive resistor on the right side is 3.2.3.I.2, and until the number of the Nth photosensitive resistor on the rightmost side is 3.2.3.I.N.

[0078] The number of the first photosensitive resistor on the left side is 3.2.3.II.1, the number of the second photosensitive resistor on the left side is 3.2.3.II.2, and until the number of the Nth photosensitive resistor on the leftmost side is 3.2.3.II.N;

[0079] The spectral characteristics of the series of photosensitive resistors 3.2.3 and the color of the filter plate 3.2.2 should correspond to the laser color and wavelength of the laser pointer 2.10, so that the series of photosensitive resistors 3.2.3 can obtain the maximum sensitivity. If a common red laser pointer is selected, a red filter should be used, and a photosensitive resistor with the photoconductive device material of cadmium selenide (CdSe) can be selected.

[0080] The controller 4 has a main board, an input end and an output end, and components such as start, stop and emergency stop. Since the structure of the controller 4 is simple and it is a mature technology, the structure of the controller 4 will not be described in detail here.

[0081] The motors 1.7 of multiple groups of torque devices 1 are controlled by the controller 4, and the signals of the controller 4 come from the photosensitive ruler 3.

[0082] The components connected to the input end of the controller 4 are the series of photosensitive resistors 3.2.3.1 and 3.2.3.I.1~N and 3.2.3.II.1~N of the photosensitive ruler 3. The output end of the controller 4 is connected to the motor 1.7 of the torque device 1 and controls the rotation speed and rotation direction of the motor.

[0083] The control logic of the controller 4 is as follows:

[0084] When the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates the center point of the photosensitive ruler 3, the input end of the controller 4 receives the signal that the resistance of the photosensitive resistance 3.2.3.1 at the center point of the photosensitive ruler 3 becomes smaller, does not output a signal, and the motor 1.7 of the torsion device 1 does not start.

[0085] When the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates the left side of the center point of the photosensitive ruler 3, the input end of the controller 4 receives the signal that the resistance values of the photosensitive resistances (3.2.3.II.1 to 3.2.3.II.N) with a certain number on the left side of the photosensitive ruler 3 become smaller, indicating that the steel truss girder has deviated to the left. At this time, the controller 4 controls the motor 1.7 of the torsion device 1 to rotate counterclockwise, and drives the flywheels 1.9 of all the torsion devices 1 to rotate counterclockwise through the gearbox 1.8. The counterclockwise rotating flywheel 1.9 generates a clockwise torque reaction force, which is transmitted to the steel truss girder through the torsion large arm 1.1 and the torsion small arm 1.3, reducing the pressure of the left side of the steel truss girder F on the lower slider and increasing the pressure of the right side of the steel truss girder F on the lower slider. The change in pressure brings a change in friction. The friction on the left side of the steel truss girder F is smaller than that on the right side. Under the action of the jack for pushing the steel truss girder, the forward speed of the left side of the steel truss girder will be greater than that of the right side, and the steel truss girder F will gradually deflect to the right until the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates the center point of the photosensitive ruler 3, the steel truss girder F is re - straightened, the deviation correction ends, and the controller 4 controls the motor 1.7 of the torsion device 1 to stop rotating.

[0086] Conversely, when the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates the right side of the center point of the photosensitive ruler 3, the input end of the controller 4 receives the signal that the resistance values of the photosensitive resistances (3.2.3.I.1 to 3.2.3.I.N) with a certain number on the right side of the photosensitive ruler 3 become smaller, indicating that the steel truss girder has deviated to the right. At this time, the controller 4 controls the motor 1.7 of the torsion device 1 to rotate clockwise, and drives the flywheels 1.9 of all the torsion devices 1 to rotate clockwise through the gearbox 1.8. The clockwise rotating flywheel 1.9 generates a counterclockwise torque reaction force, which is transmitted to the steel truss girder through the torsion large arm 1.1 and the torsion small arm 1.3, reducing the pressure of the right side of the steel truss girder on the lower slider and increasing the pressure of the left side of the steel truss girder on the lower slider. The change in pressure brings a change in friction. The friction on the right side of the steel truss girder is smaller than that on the left side. Under the action of the jack for pushing the steel truss girder, the forward speed of the right side of the steel truss girder will be greater than that of the left side, and the steel truss girder will gradually deflect to the left until the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates the center point of the photosensitive ruler 3, the steel truss girder is re - straightened, the deviation correction ends, and the controller 4 controls the motor 1.7 of the torsion device 1 to stop rotating.

[0087] The greater the deviation of the steel truss beam F, the farther the laser beam irradiation point is from the center point of the photosensitive ruler 3, and the larger the numbers of the photosensitive resistors (3.2.3.I.1 to 3.2.3.I.N) or (3.2.3.II.1 to 3.2.3.II.N) with decreasing resistance values. The controller 4 controls the motor 1.7 to increase its rotational speed.

[0088] Conversely, the smaller the deviation of the steel truss beam F, the closer the laser beam irradiation point is to the center point of the photosensitive ruler 3, and the smaller the numbers of the photosensitive resistors (3.2.3.I.1 to 3.2.3.I.N) or (3.2.3.II.1 to 3.2.3.II.N) with decreasing resistance values. The controller 4 controls the motor 1.7 to slow down its rotational speed.

[0089] The deviation correction principle is as follows:

[0090] Before the jacking of the steel truss beam F, adjust the laser pen 2.10 of the adjustable laser emitting device 2 so that the laser beam irradiates on the center point of the photosensitive ruler 3. During the jacking process of the steel truss beam, after the steel truss beam deflects, the laser beam irradiation point of the adjustable laser emitting device 2 fixed on the steel truss beam deviates from the center point photosensitive resistor and irradiates on the photosensitive resistor 3 on the right or left side, causing the resistance value of the photosensitive resistor 3 on the right or left side to decrease. The controller 4 determines the deviation direction and deviation amount of the steel truss beam according to the number of the photosensitive resistor 3 with decreasing resistance value, and then controls the rotational speed and direction of the motor 1.7 to drive the flywheel 1.9 to rotate.

[0091] The reverse torque generated by the rotation of the flywheel 1.9 of the torsion device 1 fixed on the steel truss beam causes a reverse torque on the steel truss beam. The reverse torque of the steel truss beam changes the pressure on the lower slider on both sides of the steel truss beam, thereby changing the friction force between both sides of the steel truss beam and the lower slider. Under the action of the jacking jack of the steel truss beam, the side with smaller friction force of the steel truss beam will move faster, and the side with larger friction force will move slower. The steel truss beam will deviate towards the side with larger friction force, so as to achieve the effect of deviation correction.

[0092] The specific steps of the construction method are as follows:

[0093] S100 - Construction preparation:

[0094] First, install structures such as the temporary support B of the steel truss beam, the jacking jack J, the steel strand K, the steel truss beam F, and the guide beam G according to the conventional construction plan. Then install the torsion device 1, the adjustable laser emitting device 2, the photosensitive ruler 3, and the controller 4, and connect the photosensitive ruler 3 and the torsion device 1 to the input and output ends of the controller 4 respectively.

[0095] Adjust the extension lengths of the torsion small arms 1.3 of all the torsion devices 1 in the torsion large arms 1.1 so that the lengths of all the torsion devices 1 are equal, and then fix them.

[0096] Adjust the laser pointer adjusting bolt 2.11 to center the bubble of the spirit level 2.8 on the laser pointer adjusting bracket 2.7, and make the laser pointer 2.10 on the laser pointer adjusting bracket 2.7 horizontal.

[0097] Turn on the laser pointer 2.10, loosen the fastening bolt 2.6, adjust the position of the bottom plate 2.5 so that the distance from the laser pointer 2.10 to the steel truss beam F is the same as the distance from the center point of the light-sensitive ruler to the steel truss beam F, make the laser pointer 2.10 irradiate the center point of the light-sensitive ruler, and fix the fastening bolt 2.6.

[0098] S200 - Commissioning:

[0099] Turn on the controller 4, remove the laser pointer 2.10 from the laser pointer bracket 2.9, and manually irradiate the right-side series of light-sensitive resistors (3.2.3.I.1 to 3.2.3.I.N) with the laser pointer 2.10 from the center to the right in sequence to simulate the state where the steel truss beam gradually deflects to the right. Observe the rotation direction and speed of the flywheel 1.9 of the torsion device 1. If the flywheel 1.9 rotates clockwise and the speed increases from slow to fast, it indicates that the right deflection is normal.

[0100] Manually irradiate the right-side series of light-sensitive resistors (3.2.3.I.1 to 3.2.3.I.N) with the laser pointer 2.10 from the right to the center in sequence to simulate the state where the steel truss beam gradually returns to the normal position from the right deflection. Observe the rotation direction and speed of the flywheel 1.9 of the torsion device 1. If the flywheel 1.9 rotates clockwise and the speed decreases from fast to slow, it indicates that the right deflection returns to normal.

[0101] Manually irradiate the left-side series of light-sensitive resistors (3.2.3.II.1 to 3.2.3.II.N) with the laser pointer 2.10 from the center to the left in sequence to simulate the state where the steel truss beam gradually deflects to the left. Observe the rotation direction and speed of the flywheel 1.9 of the torsion device 1. If the flywheel 1.9 rotates counterclockwise and the speed increases from slow to fast, it indicates that the left deflection is normal.

[0102] Manually irradiate the left-side series of light-sensitive resistors (3.2.3.II.1 to 3.2.3.II.N) with the laser pointer 2.10 from the left to the center in sequence to simulate the state where the steel truss beam gradually returns to the normal position from the left deflection. Observe the rotation direction and speed of the flywheel 1.9 of the torsion device 1. If the flywheel 1.9 rotates counterclockwise and the speed decreases from fast to slow, it indicates that the left deflection returns to normal.

[0103] After there is no problem with the commissioning system, reinstall the laser pointer 2.10 to the laser pointer bracket 2.9, and then the formal jacking operation can be carried out.

[0104] S300 - Jacking Operation:

[0105] Turn on the controller 4 and the laser pointer 2.10. At this time, the laser beam of the laser pointer 2.10 irradiates on the photosensitive resistance at the center point of the photosensitive ruler 3. Turn on the jack for pushing and push normally.

[0106] During the pushing operation, if the steel truss girder deflects to the left, the beam of the laser pointer 2.10 in the adjustable laser emission device 2 fixed on the steel truss girder will move to the left. The input end of the controller 4 receives the signal that the resistance value of a certain numbered photosensitive resistance (3.2.3.II.1 - 3.2.3.II.N) on the left side of the photosensitive ruler 3 becomes smaller, and controls the motor 1.7 of the torque device 1 to rotate counterclockwise. The flywheel 1.9 of all torque devices 1 is driven to rotate counterclockwise through the gearbox 1.8. The counterclockwise rotating flywheel 1.9 generates a clockwise torque reaction force, which is transmitted to the steel truss girder through the torque arm 1.1 and the torque small arm 1.3, reducing the pressure of the left side of the steel truss girder on the lower slider and increasing the pressure of the right side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the left side of the steel truss girder is smaller than that on the right side. Under the action of the jack for pushing the steel truss girder, the advancing speed of the left side of the steel truss girder will be greater than that of the right side, and the steel truss girder will gradually deflect to the right until the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates on the center point of the photosensitive ruler 3. Then the steel truss girder returns to the correct position, and the deviation correction ends. The controller 4 controls the motor 1.7 of the torque device 1 to stop rotating.

[0107] During the pushing operation, if the steel truss girder deflects to the right, the beam of the laser pointer 2.10 in the adjustable laser emission device 2 fixed on the steel truss girder will move to the right. The input end of the controller 4 receives the signal that the resistance value of a certain numbered photosensitive resistance (3.2.3.I.1 - 3.2.3.I.N) on the left side of the photosensitive ruler 3 becomes smaller, and controls the motor 1.7 of the torque device 1 to rotate clockwise. The flywheel 1.9 of all torque devices 1 is driven to rotate clockwise through the gearbox 1.8. The clockwise rotating flywheel 1.9 generates a counterclockwise torque reaction force, which is transmitted to the steel truss girder through the torque arm 1.1 and the torque small arm 1.3, reducing the pressure of the right side of the steel truss girder on the lower slider and increasing the pressure of the left side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the right side of the steel truss girder is smaller than that on the left side. Under the action of the jack for pushing the steel truss girder, the advancing speed of the right side of the steel truss girder will be greater than that of the left side, and the steel truss girder will gradually deflect to the left until the laser beam of the laser pointer 2.10 of the adjustable laser emission device 2 irradiates on the center point of the photosensitive ruler 3. Then the steel truss girder returns to the correct position, and the deviation correction ends. The controller 4 controls the motor 1.7 of the torque device 1 to stop rotating.

Claims

1. A steel truss girder jacking and deviation correction system, comprising a permanent pier (A) and a temporary support (B). A slide bar (C) is installed on the permanent pier (A) and the temporary support (B). A steel truss girder (F) and a guide girder (G) that can slide along it are arranged on the slide bar (C). The bottom of the steel truss girder (F) and the guide girder (G) is connected to the slide bar (C) through sliders (D). Limit and locking devices (E) are arranged on both sides of the steel truss girder (F) and the guide girder (G). A counterweight (H) is arranged on the steel truss girder (F) and the guide girder (G). A jacking jack reaction frame (I) is arranged on the permanent pier (A) at the front of the steel truss girder (F) and the guide girder (G). A jacking jack (J) is arranged on the reaction frame (I). A rear anchor block (L) is arranged at the end of the steel truss girder (F). One end of a steel strand (K) is anchored on the jacking jack (J), and the other end is anchored on the rear anchor block (L). The jacking jack (J) extends to pull the steel strand (K), thereby driving the steel truss girder (F) and the guide girder (G) to move forward; It is characterized in that: A torsion device (1) is installed on the main truss at the top of the steel truss girder (F); An adjustable laser emitting device (2) is arranged at the rear end of the steel truss girder (F). The adjustable laser emitting device (2) can adjust the distance and pitch angle between it and the side of the steel truss girder (F); Light-sensitive induction rulers (3) are arranged on the platforms on both sides at the front end of the steel truss girder (F). The light-sensitive induction rulers (3) sense the laser emitted by the adjustable laser emitting device (2) to judge whether the steel truss girder (F) and the guide girder (G) are offset; A controller (4) is installed beside the light-sensitive induction ruler (3). The controller (4) receives the offset signal of the adjustable laser emitting device (2) and outputs a signal to the torsion device (1) to control the torsion device (1) to provide torsion for the steel truss girder (F); The torsion device (1) includes a torsion big arm (1.1) installed on the main truss of the steel truss girder (F). A big arm reserved groove (1.2) is arranged on the torsion big arm (1.1). A torsion small arm (1.3) sleeved inside the torsion big arm (1.1). A small arm reserved groove (1.4) is arranged on the torsion small arm (1.3). The width of the big arm reserved groove (1.2) is the same as that of the small arm reserved groove (1.4). A fastening bolt (1.5) is installed in the big arm reserved groove (1.2) and the small arm reserved groove (1.4). The torsion big arm (1.1) and the torsion small arm (1.3) are fixed through the fastening bolt (1.5). A base (1.6) is installed at the front end of the torsion small arm (1.3). A motor (1.7) and a gearbox (1.8) connected thereto are installed on the base (1.6). The gearbox (1.8) is connected to a flywheel (1.9).

2. The steel truss girder jacking and deviation correction system according to claim 1, wherein: A rear baffle (1.10) and a front baffle (1.14) are installed under the torque boom (1.1). A triangular brace (1.12) is installed between the torque boom (1.1) and the rear baffle (1.10) and the front baffle (1.14). The rear baffle (1.10) and the front baffle (1.14) are both provided with reserved slots (1.16). The fastening bolts (1.13) are connected to the bottom baffle (1.15) and installed in the reserved slots (1.16) of the rear baffle (1.10) and the front baffle (1.14). Inner liners (1.11) are lined inside the rear baffle (1.10), the front baffle (1.14), and the bottom baffle (1.15), and the entire torque device (1) is fixed to the upper main truss of the steel truss girder (F).

3. The steel truss girder incremental launching deviation rectification system according to claim 1 or 2, characterized in that: The adjustable laser emission device (2) includes a bracket (2.1), a mounting table (2.2), a bottom plate (2.5), a laser pen adjusting bracket (2.7), a laser pen bracket (2.9), a laser pen (2.10), and a laser pen adjusting bolt (2.11). The bracket (2.1) is fixed to the lower part of the steel truss girder (F) through a bracket fastening bolt (2.12). The mounting table (2.2) is fixed to the bracket (2.1). The mounting table (2.2) is provided with two reserved slots (2.3), and each reserved slot (2.3) is provided with a scale (2.4). The bottom plate (2.5) is mounted on the mounting table (2.2). The bottom plate (2.5) can slide along the reserved slots (2.3) on the mounting table (2.2) and is fixed through a fastening bolt (2.6). Two laser pen adjusting bolts (2.11) are provided at the positions of the two reserved slots (2.3) of the bottom plate (2.5). A laser pen adjusting bracket (2.7) is fixed on the laser pen adjusting bolt (2.11). A laser pen bracket (2.9) and a spirit level (2.8) are fixed on the laser pen adjusting bracket (2.7). The laser pen (2.10) is fixed in the laser pen bracket (2.9).

4. The steel truss girder incremental launching and deviation rectifying system according to claim 3, wherein: The light-sensitive induction ruler (3) includes a light-sensitive induction ruler bracket (3.1) and a light-sensitive induction ruler body (3.2). The light-sensitive induction ruler body (3.2) is fixed on the light-sensitive induction ruler bracket (3.1). The light-sensitive induction ruler body (3.2) includes a light-sensitive induction ruler frame (3.2.1). A series of light-sensitive induction resistors (3.2.3) arranged horizontally are provided on the light-sensitive induction ruler frame (3.2.1). A filter plate (3.2.2) is covered on the series of light-sensitive induction resistors (3.2.3).

5. The steel truss girder incremental launching and deviation correction system according to claim 4, wherein: The spectral characteristics of the series of light-sensitive induction resistors (3.2.3) and the color of the filter plate (3.2.2) correspond to the laser color and wavelength of the laser pen (2.10).

6. The steel truss girder incremental launching and deviation correction system according to claim 5, wherein: The series of light-sensitive induction resistors (3.2.3) includes a center point light-sensitive induction resistor (3.2.3.1) located at the center position, and a plurality of left-side light-sensitive induction resistors and a plurality of right-side light-sensitive induction resistors located on both sides.

7. A construction method of the steel truss girder jacking and deviation correction system as described in claim 6, characterized in that: It includes the following steps S100 - Construction preparation, install all the structures of the system in place; S200 - Debug the system; S300 - Jacking operation: Turn on the controller (4) and the laser pointer (2.10). At this time, the laser beam of the laser pointer (2.10) irradiates on the photosensitive resistance at the center point of the photosensitive ruler (3). Turn on the pushing jack and perform normal pushing; During the pushing operation, if the steel truss girder deflects to the left, the laser beam of the laser pointer (2.10) in the adjustable laser emission device (2) fixed on the steel truss girder will move to the left. The controller (4) receives a signal that the resistance value of a photosensitive resistance with a certain number on the left side of the photosensitive ruler (3) becomes smaller at the input end, and controls the motor (1.7) of the torque device (1) to rotate counterclockwise. The flywheel (1.9) of all torque devices (1) is driven to rotate counterclockwise through the gearbox (1.8). The counterclockwise rotating flywheel (1.9) generates a clockwise torque reaction force, which is transmitted to the steel truss girder through the torque arm (1.1) and the torque forearm (1.3), reducing the pressure of the left side of the steel truss girder on the lower slider and increasing the pressure of the right side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the left side of the steel truss girder is smaller than that on the right side. Under the action of the pushing jack of the steel truss girder, the advancing speed of the left side of the steel truss girder will be greater than that of the right side, and the steel truss girder will gradually deflect to the right until the laser beam of the laser pointer (2.10) of the adjustable laser emission device (2) irradiates on the center point of the photosensitive ruler (3), at which time the steel truss girder is repositioned and the deviation correction ends. The controller (4) controls the motor (1.7) of the torque device (1) to stop rotating; During the pushing operation, if the steel truss girder deflects to the right, the laser beam of the laser pointer (2.10) in the adjustable laser emission device (2) fixed on the steel truss girder will move to the right. The controller (4) receives a signal that the resistance value of a photosensitive resistance with a certain number on the left side of the photosensitive ruler (3) becomes smaller at the input end, and controls the motor (1.7) of the torque device (1) to rotate clockwise. The flywheel (1.9) of all torque devices (1) is driven to rotate clockwise through the gearbox (1.8). The clockwise rotating flywheel (1.9) generates a counterclockwise torque reaction force, which is transmitted to the steel truss girder through the torque arm (1.1) and the torque forearm (1.3), reducing the pressure of the right side of the steel truss girder on the lower slider and increasing the pressure of the left side of the steel truss girder on the lower slider. The change in pressure brings about a change in friction. The friction on the right side of the steel truss girder is smaller than that on the left side. Under the action of the pushing jack of the steel truss girder, the advancing speed of the right side of the steel truss girder will be greater than that of the left side, and the steel truss girder will gradually deflect to the left until the laser beam of the laser pointer (2.10) of the adjustable laser emission device (2) irradiates on the center point of the photosensitive ruler (3), at which time the steel truss girder is repositioned and the deviation correction ends. The controller (4) controls the motor (1.7) of the torque device (1) to stop rotating.

8. A construction method of the steel truss girder jacking and deviation correction system according to claim 7, characterized in that: The specific steps of step S100 include S101 - Install the temporary support (B) of the steel truss beam, the jacking jack (J), the steel strand (K), the steel truss beam (F), and the guide beam (G) according to the conventional construction plan. Then install the torsion device (1), the adjustable laser emission device (2), the light-sensitive ruler (3), and the controller (4), and connect the light-sensitive ruler (3) and the torsion device (1) to the input and output ends of the controller (4) respectively; S102 - Adjust the extension length of the torsion small arm (1.3) of all torsion devices (1) in the torsion large arm (1.1) to make the lengths of all torsion devices (1) equal, and then fix them; S103 - Adjust the laser pen adjustment bolt (2.11) to make the bubble of the spirit level (2.8) on the laser pen adjustment bracket (2.7) centered, and the laser pen (2.10) on the laser pen adjustment bracket (2.7) is horizontal; S104 - Turn on the laser pen (2.10), loosen the fastening bolt (2.6), adjust the position of the bottom plate (2.5) so that the distance from the laser pen (2.10) to the steel truss beam (F) is the same as the distance from the center point of the light-sensitive ruler to the steel truss beam (F), make the laser pen (2.10) irradiate the center point of the light-sensitive ruler, and fix the fastening bolt (2.6).

9. A construction method of the steel truss girder jacking and deviation correction system as claimed in claim 7 or 8, characterized in that: The specific steps of S200 are as follows: S201 - Turn on the controller (4), remove the laser pen (2.10) from the laser pen bracket (2.9), manually irradiate the right-side series of light-sensitive resistors with the laser pen (2.10) from the center to the right in turn to simulate the state of the steel truss beam gradually deflecting to the right, observe the rotation direction and rotation speed of the flywheel (1.9) of the torsion device (1). If the flywheel (1.9) rotates clockwise and the rotation speed increases from slow to fast, it means that the right deflection is normal; S202 - Manually irradiate the right-side series of light-sensitive resistors with the laser pen (2.10) from the right to the center in turn to simulate the state of the steel truss beam gradually returning to normal from the right deflection, observe the rotation direction and rotation speed of the flywheel (1.9) of the torsion device (1). If the flywheel (1.9) rotates clockwise and the rotation speed decreases from fast to slow, it means that the right deflection returns to normal; S203 - Manually irradiate the left-side series of light-sensitive resistors with the laser pen (2.10) from the center to the left in turn to simulate the state of the steel truss beam gradually deflecting to the left, observe the rotation direction and rotation speed of the flywheel (1.9) of the torsion device (1). If the flywheel (1.9) rotates counterclockwise and the rotation speed increases from slow to fast, it means that the left deflection is normal; S204 - Manually irradiate the left-side series of light-sensitive resistors with the laser pen (2.10) from the left to the center in turn to simulate the state of the steel truss beam gradually returning to normal from the left deflection, observe the rotation direction and rotation speed of the flywheel (1.9) of the torsion device (1). If the flywheel (1.9) rotates counterclockwise and the rotation speed decreases from fast to slow, it means that the left deflection returns to normal; S205 - After debugging the system without problems, reinstall the laser pen (2.10) to the laser pen bracket (2.9), and then the formal jacking operation can be carried out.

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