Steel truss bridge pushing and falling device and construction method

Abstract

The invention discloses a steel truss bridge pushing and falling device and a construction method.The construction method comprises the following specific steps that S100, a plurality of temporary supporting piers are set up in the advancing direction of a steel truss bridge, a walking type pushing mechanism is installed on the top of each temporary supporting pier, then the walking type pushing mechanisms are debugged, and the steel truss bridge is pushed to fall into the steel truss bridge; a plurality of walking type pushing mechanisms can operate synchronously; s200, pre-assembly construction is conducted on the steel truss bridge at the initial pushing position of the steel truss bridge, deformation monitoring equipment needs to be installed at all stress point positions in the pre-assembly process of the steel truss bridge, and the steel truss bridge is corrected in time according to data fed back by the deformation monitoring equipment; s300, after the steel truss bridge is assembled, deformation monitoring equipment is installed on a stress point between the steel truss bridge and the walking type pushing mechanism, and meanwhile displacement monitoring equipment is installed on the steel truss bridge; and then the plurality of walking type pushing mechanisms are controlled to work synchronously.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a steel truss bridge top-pushing and lowering device and a construction method. Background Art

[0002] With the continuous development of transportation infrastructure, steel truss bridges have been widely used in modern bridge construction due to their advantages such as large span, strong bearing capacity and fast construction speed. However, there are many technical difficulties in the construction process of steel truss bridges. Steel truss bridges are widely used due to their high strength and large span. Traditional steel truss bridge construction methods often have problems such as long construction period, great impact on the surrounding environment, and difficulty in ensuring construction accuracy. The walking jacking construction method, as a more advanced construction technology, can effectively solve these problems.

[0003] In the prior art, a Chinese patent application with publication number CN114892538A discloses a device and a beam dropping method for jacking a super-high-position beam of a bridge, comprising a frame column, a walking-type jacking mechanism, a hand-changing pier, a hand-changing column, a hand-changing beam, an elevation adjustment component, a fall chain, a hydraulic jack and a bridge; there are two frame columns, and the two frame columns are symmetrically arranged, a distribution beam is arranged at the top of the frame column, a jacking longitudinal beam is arranged at the top of the distribution beam on the left, the walking-type jacking mechanism is arranged on the surface of the jacking longitudinal beam through a clamping plate, and a hand-changing pier is arranged at the top of the distribution beam on the right, the hand-changing pier is composed of a hand-changing column, a hand-changing beam, an elevation adjustment component and a soft cushioning material; the hand-changing column is composed of a column standard component and a flange, wherein the column standard component is connected to the flange by bolts; the hand-changing column is welded and fixed to the distribution beam, the end of the hand-changing beam is bolted to the hand-changing column, and the elevation adjustment component is bolted to the hand-changing beam and the column standard component.

[0004] The above patent provides a device and method for pushing and dropping the super-high beam of a bridge, which uses a walking pushing mechanism to push and drop the bridge. However, this existing construction method has poor adaptability to complex terrain and special environments. For example, when constructing in mountainous areas, rivers and other areas, the construction difficulty is greatly increased due to site restrictions and natural conditions, which is not conducive to efficient pushing and dropping of steel truss bridges. Summary of the invention

[0005] The purpose of the present invention is to provide a steel truss bridge pushing and lowering device and construction method, aiming to improve the problem that the existing construction method has poor adaptability to complex terrain and special environment, which is not conducive to efficient pushing and lowering construction of steel truss bridges.

[0006] The present invention is achieved in that:

[0007] In order to achieve the above object, according to one aspect of the present invention, the present invention provides a steel truss bridge top-pushing and bridge-dropping construction method, and the specific steps of the construction method are as follows:

[0008] S100, build multiple temporary support piers in the forward direction of the steel truss bridge, install a walking-type jacking mechanism on the top of each temporary support pier, and then debug the walking-type jacking mechanism so that multiple walking-type jacking mechanisms can operate synchronously;

[0009] S200, pre-assembling the steel truss bridge at the starting position of the jacking of the steel truss bridge, installing deformation monitoring equipment at each stress point during the pre-assembly of the steel truss bridge, and timely correcting the steel truss bridge according to the data fed back by the deformation monitoring equipment;

[0010] S300, after the steel truss bridge is assembled, a deformation monitoring device is installed at the stress point between the steel truss bridge and the walking-type jacking mechanism, and a displacement monitoring device is installed on the steel truss bridge; then, multiple walking-type jacking mechanisms are controlled to work synchronously, so that the walking-type jacking mechanisms jack up and move the steel truss bridge;

[0011] S400, when the steel truss bridge is pushed into place, it is necessary to prepare for the bridge lowering construction, install the hydraulic synchronous bridge lowering system on the bridge piers and temporary support piers, and install the beam lowering pads on the stress points of the bridge piers; then control the hydraulic synchronous bridge lowering system to carry out the bridge lowering construction on the steel truss bridge;

[0012] S500. After the bridge lowering construction is completed, the temporary supporting piers will be removed and the steel truss bridge will be further reinforced to ensure the stability of the entire steel truss bridge structure.

[0013] Furthermore, in step S100, before installing the walking type pushing mechanism, a mechanical model of the pushing process should be established, and the pushing force should be calculated according to the formula:

[0014]

[0015] where F 顶推 is the jacking force, k1 is the coefficient considering external factors such as wind resistance, G1 is the bridge weight, G2 is the construction load, μ is the friction coefficient, k2 is the coefficient considering the change of friction resistance, L0 is the jacking distance; n is the number of jacks; θ is the angle between the jack and the horizontal direction; α is the slope angle of the bridge; according to the jacking force F 顶推 Choose the appropriate walking type pushing mechanism according to the size.

[0016] Furthermore, in the step S100, after the walking-type pushing mechanism is installed, a crossbeam is erected on the top of the laterally aligned walking-type pushing mechanism, and the crossbeam is against the bottom of the steel truss bridge.

[0017] Furthermore, the walking-type pushing mechanism in step S300 includes a lifting hydraulic cylinder, a lateral adjustment hydraulic cylinder and a longitudinal push hydraulic cylinder; the specific steps of pushing the steel truss bridge using the walking-type pushing mechanism are as follows:

[0018] S310, starting the lifting hydraulic cylinder so that the lifting hydraulic cylinder lifts up the steel truss bridge to separate the steel truss bridge from the supporting point;

[0019] S320, driving the longitudinal push hydraulic cylinder so that the longitudinal drive hydraulic cylinder drives the lifting hydraulic cylinder and the steel truss bridge to move forward a certain distance;

[0020] S330, the output end of the lifting hydraulic cylinder is lowered, so that the steel truss bridge is temporarily placed on the sliding device, and then the hydraulic cylinder is pushed longitudinally to drive the lifting hydraulic cylinder to reset;

[0021] S340, repeating steps S310-S330 until the steel truss bridge moves to the designated position. During the process of pushing the steel truss bridge, if the steel truss bridge has a lateral displacement deviation, the lateral adjustment hydraulic cylinder can be controlled to adjust the lateral position of the steel truss.

[0022] Furthermore, in step S400, before installing the hydraulic synchronous bridge-dropping system, it is necessary to calculate the force borne by each lifting hydraulic cylinder of the hydraulic synchronous bridge-dropping system, and the calculation method is as follows: a mechanical model of the bridge-dropping process is established, and the bridge-dropping force is calculated according to the following formula:

[0023]

[0024] where F 落桥 is the bridge-dropping force, k3 is the coefficient considering factors such as air resistance during the bridge-dropping process, G0 is the bridge deadweight; F0 is the support reaction force before the bridge is dropped, μ1 is the friction coefficient during the bridge-dropping process, k4 is the coefficient considering the change of friction resistance, H0 is the bridge-dropping height, m ​​is the number of bridge-dropping equipment, β is the angle between the bridge-dropping equipment and the horizontal direction, and γ is the projection angle of the bridge slope angle in the bridge-dropping direction; according to the bridge-dropping force F 落桥 Choose the appropriate type of hydraulic cylinder according to the size.

[0025] Furthermore, the specific steps of carrying out bridge lowering construction on the steel truss bridge in step S400 are as follows:

[0026] S410, synchronously start each lifting hydraulic cylinder to slowly lift the bridge to a certain height, so that the bridge is separated from the original supporting point;

[0027] S420, remove the temporary support structure at the original support point to ensure that the steel truss bridge can land smoothly on the pier;

[0028] S430, slowly lowering the height of the hydraulic jack to gradually lower the bridge; during the lowering process, monitoring the displacement and stress of the bridge in real time;

[0029] S440. When the bridge approaches the designed position of the pier stress point, slow down the falling speed and make precise adjustments to ensure that the bridge falls accurately at the designed position.

[0030] According to the second aspect of the present invention, the present invention provides a steel truss bridge pushing and lowering equipment, which is used for the above-mentioned steel truss bridge pushing and lowering construction method, and includes a walking-type pushing mechanism. The walking-type pushing mechanism includes a mounting base and a moving box. A moving box is provided on the upper surface of the mounting base, and the moving box can move forward and backward on the upper surface of the mounting base; a lifting hydraulic cylinder is provided on the inner side of the moving box, and transverse adjustment hydraulic cylinders are symmetrically provided on both sides of the moving box, and the output end of the transverse adjustment hydraulic cylinder is connected to the lifting hydraulic cylinder; a longitudinal pushing hydraulic cylinder is provided at the rear end of the mounting base, and the output end of the longitudinal pushing hydraulic cylinder is connected to the moving box; it is used to drive the moving box, the lifting hydraulic cylinder and the transverse adjustment hydraulic cylinder to move forward and backward.

[0031] Furthermore, fixed edges are symmetrically provided at the bottom of both sides of the mounting base, and a plurality of fixing holes are evenly provided on the fixed edges from front to back; a limit platform is provided at the rear end of the upper surface of the mounting base, and a through hole is provided in the middle of the limit platform; a slide groove is provided along the front of the limit platform on the upper surface of the mounting base.

[0032] Furthermore, mounting sleeves are symmetrically provided on both sides of the movable box, and a plurality of fixing grooves are evenly provided on one end of the mounting sleeves facing the outer side surface. A connecting hole is provided at the position of the perforation aligned on the rear end surface of the movable box, and a groove is provided around the connecting hole on the inner side surface of the movable box. The bottom of the movable box is inserted into the slide groove, and a mounting groove is provided on the bottom surface of the movable box, and rollers are evenly provided inside the mounting grooves, and the rollers are used to reduce the friction between the movable box and the mounting base.

[0033] Furthermore, a supporting platform is provided on the top of the output end of the lifting hydraulic cylinder, connecting platforms are provided on both sides of the lifting hydraulic cylinder aligned with the position of the transverse adjustment hydraulic cylinder, and a fixed end plate is provided at the output end of the transverse adjustment hydraulic cylinder, and the fixed end plate is connected to the connecting platform by fixing bolts; a connecting plate is provided at the end of the transverse adjustment hydraulic cylinder facing the outside, and a plurality of countersunk holes are evenly provided on the edge of the connecting plate, and the bolts are connected to the mobile box through the countersunk holes; a mounting ring is provided on the side of the longitudinal pushing hydraulic cylinder, and a plurality of mounting holes are evenly provided on the mounting ring, and the mounting ring is fixed to the mounting base by bolts; and a hydraulic telescopic rod is provided at the output end of the longitudinal pushing hydraulic cylinder, and a stud is provided at the output of the hydraulic telescopic rod, and the stud passes through the connecting hole, and a nut is provided at one end of the stud passing through the connecting hole.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The construction method provided by the present invention has good adaptability to complex terrain and special environments, and can be carried out smoothly under different construction conditions; and multiple synchronous walking-type pushing mechanisms and hydraulic synchronous bridge-dropping systems are used to improve the accuracy and efficiency of construction, and ensure the stability and safety of the construction process. At the same time, the steel truss bridge can be fine-tuned to both sides through the walking-type pushing mechanism, so that deviations in the movement of the steel truss bridge can be adjusted in time; and a displacement monitoring module and a deformation monitoring module are provided during the movement of the steel truss bridge, and the displacement distance and deformation of the steel truss bridge can be monitored through the displacement monitoring module and the deformation monitoring module, so as to ensure that the entire steel truss bridge can be stably and accurately pushed and dropped.

[0036] 2. The present invention monitors and controls the construction process by establishing a mechanical model and adopting a real-time monitoring system and algorithm, and can adjust the construction parameters in time to avoid damage to the bridge structure.

[0037] 3. The present invention improves the accuracy and safety of construction by accurately calculating the jacking force; and adopts a walking-type jacking mechanism, so the construction process is smooth and has little impact on the surrounding environment.

[0038] 4. The present invention ensures the safety and reliability of the bridge lowering process by accurately calculating the bridge lowering force; and realizes the precise control of the bridge lowering process by using hydraulic jacks and a real-time monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flowchart of the construction method of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the walking type pushing mechanism of the present invention;

[0041] Figure 3 It is a structural schematic diagram of the mounting base of the present invention;

[0042] Figure 4 It is a schematic structural diagram of the front end of the mobile box of the present invention from an oblique downward angle;

[0043] Figure 5 It is a schematic structural diagram of the mobile box of the present invention at a front oblique upward viewing angle;

[0044] Figure 6 It is a structural schematic diagram of the lifting hydraulic cylinder and the lateral adjustment hydraulic cylinder of the present invention;

[0045] Figure 7 It is a structural schematic diagram of the longitudinally pushing hydraulic cylinder of the present invention.

[0046] In the figure: 1. Mounting base; 11. Fixed edge; 12. Fixed hole; 13. Slide groove; 14. Limiting platform; 15. Perforation; 2. Moving box; 21. Mounting sleeve; 22. Fixed groove; 23. Connecting hole; 24. Groove; 25. Mounting groove; 26. Roller; 3. Lifting hydraulic cylinder; 31. Support platform; 32. Connecting platform; 4. Lateral adjustment hydraulic cylinder; 41. Fixed end plate; 42. Fixed bolt; 43. Connecting plate; 44. Countersunk hole; 5. Longitudinal push hydraulic cylinder; 51. Mounting ring; 52. Mounting hole; 53. Hydraulic telescopic rod; 54. Stud; 55. Nut. DETAILED DESCRIPTION

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a steel truss bridge top-pushing and lowering bridge device and a construction method, and the specific steps of the construction method are as follows:

[0051] S100. Build multiple temporary support piers in the forward direction of the steel truss bridge, and install a walking-type jacking mechanism on the top of each temporary support pier, and then debug the walking-type jacking mechanism so that multiple walking-type jacking mechanisms can operate synchronously; after the walking-type jacking mechanism is installed, a crossbeam is erected on the top of the horizontally aligned walking-type jacking mechanism, and the crossbeam is against the bottom of the steel truss bridge. Before installing the walking-type jacking mechanism, a mechanical model of the jacking process should be established, and the jacking force should be calculated according to the formula:

[0052]

[0053] where F 顶推 is the jacking force, k1 is the coefficient considering external factors such as wind resistance, G1 is the bridge weight, G2 is the construction load, μ is the friction coefficient, k2 is the coefficient considering the change of friction resistance, L0 is the jacking distance; n is the number of jacks; θ is the angle between the jack and the horizontal direction; α is the slope angle of the bridge; according to the jacking force F 顶推 Choose the appropriate walking type pushing mechanism according to the size.

[0054] S200, pre-assembling the steel truss bridge at the starting position of the jacking of the steel truss bridge, installing deformation monitoring equipment at each stress point during the pre-assembly of the steel truss bridge, and timely correcting the steel truss bridge according to the data fed back by the deformation monitoring equipment;

[0055] S300, after the steel truss bridge is assembled, a deformation monitoring device is installed at the stress point between the steel truss bridge and the walking-type pushing mechanism, and a displacement monitoring device is installed on the steel truss bridge; then, multiple walking-type pushing mechanisms are controlled to work synchronously, so that the walking-type pushing mechanisms can lift and move the steel truss bridge; the walking-type pushing mechanism includes a lifting hydraulic cylinder 3, a lateral adjustment hydraulic cylinder 4 and a longitudinal pushing hydraulic cylinder 5; the specific steps of using the walking-type pushing mechanism to push the steel truss bridge are as follows:

[0056] S310, start the lifting hydraulic cylinder 3, so that the lifting hydraulic cylinder 3 lifts up the steel truss bridge, so that the steel truss bridge is separated from the supporting point;

[0057] S320, driving the longitudinal push hydraulic cylinder 5 so that the longitudinal drive hydraulic cylinder drives the lifting hydraulic cylinder 3 and the steel truss bridge to move forward a certain distance;

[0058] S330, the output end of the lifting hydraulic cylinder 3 is lowered, so that the steel truss bridge is temporarily placed on the sliding device, and then the hydraulic cylinder 5 is pushed longitudinally to drive the lifting hydraulic cylinder 3 to reset;

[0059] S340, repeating steps S310-S330 until the steel truss bridge moves to the designated position. During the process of pushing the steel truss bridge, if the steel truss bridge has a lateral displacement deviation, the lateral adjustment hydraulic cylinder 4 can be controlled to adjust the lateral position of the steel truss.

[0060] S400. When the steel truss bridge is pushed into place, it is necessary to prepare for the bridge lowering construction. The hydraulic synchronous bridge lowering system is installed on the bridge piers and temporary support piers, and the beam lowering pads are installed on the stress points of the bridge piers. Then the hydraulic synchronous bridge lowering system is controlled to perform bridge lowering construction on the steel truss bridge. Before installing the hydraulic synchronous bridge lowering system, the force borne by each lifting hydraulic cylinder of the hydraulic synchronous bridge lowering system needs to be calculated. The calculation method is as follows: Establish a mechanical model of the bridge lowering process, and calculate the bridge lowering force according to the following formula:

[0061]

[0062] where F 落桥is the bridge-dropping force, k3 is the coefficient considering factors such as air resistance during the bridge-dropping process, G0 is the bridge deadweight; F0 is the support reaction force before the bridge is dropped, μ1 is the friction coefficient during the bridge-dropping process, k4 is the coefficient considering the change of friction resistance, H0 is the bridge-dropping height, m ​​is the number of bridge-dropping equipment, β is the angle between the bridge-dropping equipment and the horizontal direction, and γ is the projection angle of the bridge slope angle in the bridge-dropping direction; according to the bridge-dropping force F 落桥 Choose the appropriate type of hydraulic cylinder according to the size. The specific steps for the bridge drop construction of the steel truss bridge are as follows:

[0063] S410, synchronously start each lifting hydraulic cylinder to slowly lift the bridge to a certain height, so that the bridge is separated from the original supporting point;

[0064] S420, remove the temporary support structure at the original support point to ensure that the steel truss bridge can land smoothly on the pier;

[0065] S430, slowly lowering the height of the hydraulic jack to gradually lower the bridge; during the lowering process, monitoring the displacement and stress of the bridge in real time;

[0066] S440. When the bridge approaches the designed position of the pier stress point, slow down the falling speed and make precise adjustments to ensure that the bridge falls accurately at the designed position.

[0067] S500. After the bridge lowering construction is completed, the temporary supporting piers will be removed and the steel truss bridge will be further reinforced to ensure the stability of the entire steel truss bridge structure.

[0068] Example 2

[0069] like Figure 2 As shown, this embodiment provides a steel truss bridge jacking and lowering equipment; including a walking jacking mechanism, the walking jacking mechanism includes a mounting base 1 and a moving box 2, the upper surface of the mounting base 1 is provided with a moving box 2, and the moving box 2 can move forward and backward on the upper surface of the mounting base 1; thereby facilitating the pushing of the steel truss bridge to move. A lifting hydraulic cylinder 3 is provided on the inner side of the moving box 2, and the lifting hydraulic cylinder 3 is used to lift the steel truss bridge. And lateral adjustment hydraulic cylinders 4 are symmetrically provided on both sides of the moving box 2, and the output end of the lateral adjustment hydraulic cylinder 4 is connected to the lifting hydraulic cylinder 3; the lateral adjustment hydraulic cylinder 4 is used to push the lifting hydraulic cylinder 3 to carry the steel truss bridge to move left and right. A longitudinal pushing hydraulic cylinder 5 is provided at the rear end of the mounting base 1, and the output end of the longitudinal pushing hydraulic cylinder 5 is connected to the moving box 2; it is used to drive the moving box 2, the lifting hydraulic cylinder 3 and the lateral adjustment hydraulic cylinder 4 to move forward and backward.

[0070] Working principle: Use the lifting hydraulic cylinder 3 to lift the steel truss bridge, and then the steel truss bridge is driven forward by the longitudinal push hydraulic cylinder 5; then the lifting hydraulic cylinder 3 retracts, and the longitudinal push hydraulic cylinder 5 drives the moving box 2 and the lifting hydraulic cylinder 3 to reset; then the lifting hydraulic cylinder 3 lifts the bridge again, and the longitudinal push hydraulic cylinder 5 drives the steel truss bridge to move again; reciprocating operation in this way can move the steel truss bridge to the specified position. When the steel truss bridge has lateral deviation, it can be adjusted by the lateral adjustment hydraulic cylinder 4. Compared with the prior art,

[0071] Example 3

[0072] like Figure 2 As shown, this embodiment provides a steel truss bridge jacking and lowering equipment; including a walking jacking mechanism, the walking jacking mechanism includes a mounting base 1 and a moving box 2, the upper surface of the mounting base 1 is provided with a moving box 2, and the moving box 2 can move forward and backward on the upper surface of the mounting base 1; thereby facilitating the pushing of the steel truss bridge to move. A lifting hydraulic cylinder 3 is provided on the inner side of the moving box 2, and the lifting hydraulic cylinder 3 is used to lift the steel truss bridge. And lateral adjustment hydraulic cylinders 4 are symmetrically provided on both sides of the moving box 2, and the output end of the lateral adjustment hydraulic cylinder 4 is connected to the lifting hydraulic cylinder 3; the lateral adjustment hydraulic cylinder 4 is used to push the lifting hydraulic cylinder 3 to carry the steel truss bridge to move left and right. A longitudinal pushing hydraulic cylinder 5 is provided at the rear end of the mounting base 1, and the output end of the longitudinal pushing hydraulic cylinder 5 is connected to the moving box 2; it is used to drive the moving box 2, the lifting hydraulic cylinder 3 and the lateral adjustment hydraulic cylinder 4 to move forward and backward.

[0073] like Figure 3 As shown, the bottom of both sides of the mounting base 1 is symmetrically provided with fixing edges 11, and the fixing edges 11 are evenly provided with multiple fixing holes 12 from front to back; the cooperation of the fixing edges 11 and the fixing holes 12 is convenient for fixing the position of the mounting base 1 by bolts. A limit platform 14 is provided at the rear end of the upper surface of the mounting base 1, and a through hole 15 is provided in the middle of the limit platform 14; the limit platform 14 cooperates with the through hole 15 to facilitate the installation of the longitudinal push hydraulic cylinder, so that the longitudinal push hydraulic cylinder can drive the moving box 2 to move forward and backward. A slide groove 13 is provided on the upper surface of the mounting base 1 along the front of the limit platform 14, and the slide groove 13 is convenient for the moving box 2 to move back and forth in the slide groove 13.

[0074] like Figure 4 and Figure 5As shown, the two sides of the mobile box 2 are symmetrically provided with mounting sleeves 21, and one end of the mounting sleeve 21 facing the outer side is evenly provided with a plurality of fixing grooves 22. The mounting sleeve 21 cooperates with the fixing grooves 22 to facilitate the installation of the transverse adjustment hydraulic cylinder 4, and to facilitate the use of the transverse adjustment hydraulic cylinder 4. A connecting hole 23 is provided at the rear end surface of the mobile box 2 aligned with the through hole 15, and a groove 24 is provided along the inner side surface of the mobile box 2 around the connecting hole 23; the cooperation of the connecting hole 23 and the groove 24 is convenient for longitudinally pushing the hydraulic cylinder 5 to connect with the mobile box 2. The bottom of the mobile box 2 is inserted into the slide groove 13, and the bottom surface of the mobile box 2 is provided with a mounting groove 25, and rollers 26 are evenly provided inside the mounting groove 25. The rollers 26 are used to reduce the friction between the mobile box 2 and the mounting base 1. This structure is convenient for the mobile base to move back and forth inside the slide groove 13.

[0075] like Figure 6 and Figure 7 As shown, a cap 31 is provided on the top of the output end of the lifting hydraulic cylinder 3, and the cap 31 is convenient for lifting and moving the steel truss bridge. A connecting platform 32 is provided on both sides of the lifting hydraulic cylinder 3 to align with the position of the lateral adjustment hydraulic cylinder 4, and a fixed end plate 41 is provided at the output end of the lateral adjustment hydraulic cylinder 4, and the fixed end plate 41 is connected to the connecting platform 32 through a fixing bolt 42; the connecting platform 32 is convenient for cooperating with the lateral adjustment hydraulic cylinder 4, and convenient for the lateral adjustment hydraulic cylinder 4 to be connected with the lifting hydraulic cylinder 3. A connecting plate 43 is provided at one end of the lateral adjustment hydraulic cylinder 4 facing the outside, and a plurality of countersunk holes 44 are evenly provided on the edge of the connecting plate 43, and the bolts are connected to the moving box 2 through the countersunk holes 44; this structure ensures that the lateral adjustment hydraulic cylinder 4 is connected with the lifting hydraulic cylinder 3. A mounting ring 51 is provided on the side of the longitudinal pushing hydraulic cylinder 5, and a plurality of mounting holes 52 are evenly provided on the mounting ring 51, and the mounting ring 51 is fixed on the mounting base 1 by bolts; it is convenient for the longitudinal pushing hydraulic cylinder 5 to be connected. And a hydraulic telescopic rod 53 is provided at the output end of the longitudinal pushing hydraulic cylinder 5, and the hydraulic telescopic rod 53 is used to drive the moving box 2 to move forward and backward. The output of the hydraulic telescopic rod 53 is provided with a stud 54, which passes through the connecting hole 23, and a nut 55 is provided at one end of the stud 54 passing through the connecting hole 23; this structure facilitates the hydraulic telescopic rod 53 to be stably connected to the longitudinal pushing hydraulic cylinder 5.

[0076] In summary, compared with the prior art, the construction method provided by the present invention has better adaptability to complex terrain and special environments, and can be carried out smoothly under different construction conditions; and the use of multiple synchronous walking-type pushing mechanisms and hydraulic synchronous bridge-dropping systems improves the accuracy and efficiency of construction, and ensures the smoothness and safety of the construction process. At the same time, the steel truss bridge can be fine-tuned to both sides through the walking-type pushing mechanism, so that deviations in the movement of the steel truss bridge can be adjusted back in time; and a displacement monitoring module and a deformation monitoring module are provided during the movement of the steel truss bridge, and the displacement distance and deformation of the steel truss bridge can be monitored through the displacement monitoring module and the deformation monitoring module, ensuring that the entire steel truss bridge can be stably and accurately pushed and dropped.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for constructing a steel truss bridge by pushing and lowering the bridge, characterized in that: The steps include: S100, build multiple temporary support piers in the forward direction of the steel truss bridge, install a walking-type jacking mechanism on the top of each temporary support pier, and then debug the walking-type jacking mechanism so that multiple walking-type jacking mechanisms can operate synchronously; S200, pre-assembling the steel truss bridge at the starting position of the jacking of the steel truss bridge, installing deformation monitoring equipment at each stress point during the pre-assembly of the steel truss bridge, and timely correcting the steel truss bridge according to the data fed back by the deformation monitoring equipment; S300, after the steel truss bridge is assembled, a deformation monitoring device is installed at the stress point between the steel truss bridge and the walking-type jacking mechanism, and a displacement monitoring device is installed on the steel truss bridge; then, multiple walking-type jacking mechanisms are controlled to work synchronously, so that the walking-type jacking mechanisms jack up and move the steel truss bridge; S400, when the steel truss bridge is pushed into place, it is necessary to prepare for the bridge lowering construction, install the hydraulic synchronous bridge lowering system on the bridge piers and temporary support piers, and install the beam lowering pads on the stress points of the bridge piers; then control the hydraulic synchronous bridge lowering system to carry out the bridge lowering construction on the steel truss bridge; S500. After the bridge lowering construction is completed, the temporary supporting piers will be removed and the steel truss bridge will be further reinforced to ensure the stability of the entire steel truss bridge structure.

2. The method for constructing a steel truss bridge by pushing and lowering the bridge according to claim 1 is characterized in that: In step S100, before installing the walking type pushing mechanism, a mechanical model of the pushing process is established, and the pushing force is calculated according to the formula: Among them, F 顶推 is the jacking force, k1 is the coefficient considering external factors such as wind resistance, G1 is the bridge weight, G2 is the construction load, μ is the friction coefficient, k2 is the coefficient considering the change of friction resistance, L0 is the jacking distance; n is the number of jacks; θ is the angle between the jack and the horizontal direction; α is the slope angle of the bridge; according to the jacking force F 顶推 Choose the appropriate walking type pushing mechanism according to the size.

3. The method for constructing a steel truss bridge by pushing and lowering the bridge according to claim 2 is characterized in that: In the step S100, after the walking-type pushing mechanism is installed, a crossbeam is erected on the top of the laterally aligned walking-type pushing mechanism, and the crossbeam is against the bottom of the steel truss bridge.

4. A method for constructing a steel truss bridge by pushing and lowering the bridge according to any one of claims 1 to 3, characterized in that: The specific steps of using the walking type pushing mechanism to push the steel truss bridge in step S300 are as follows: S310, starting the lifting hydraulic cylinder (3), so that the lifting hydraulic cylinder (3) lifts up the steel truss bridge, so that the steel truss bridge is separated from the supporting point; S320, driving the longitudinal pushing hydraulic cylinder (5), so that the longitudinal driving hydraulic cylinder drives the lifting hydraulic cylinder (3) and the steel truss bridge to move forward a certain distance; S330, the output end of the lifting hydraulic cylinder (3) is lowered, so that the steel truss bridge is temporarily placed on the sliding device, and then the hydraulic cylinder (5) is pushed longitudinally to drive the lifting hydraulic cylinder (3) to reset; S340, repeating steps S310-S330 until the steel truss bridge moves to the designated position. During the process of pushing the steel truss bridge, if the steel truss bridge has a lateral displacement deviation, the lateral adjustment hydraulic cylinder (4) can be controlled to adjust the lateral position of the steel truss.

5. A method for constructing a steel truss bridge by pushing and lowering the bridge according to any one of claims 1 to 3, characterized in that: In step S400, before installing the hydraulic synchronous bridge-dropping system, the force borne by each lifting hydraulic cylinder of the hydraulic synchronous bridge-dropping system needs to be calculated. The calculation method is as follows: a mechanical model of the bridge-dropping process is established, and the bridge-dropping force is calculated according to the following formula: where F 落桥 is the bridge-dropping force, k3 is the coefficient considering factors such as air resistance during the bridge-dropping process, G0 is the bridge deadweight; F0 is the support reaction force before the bridge is dropped, μ1 is the friction coefficient during the bridge-dropping process, k4 is the coefficient considering the change of friction resistance, H0 is the bridge-dropping height, m ​​is the number of bridge-dropping equipment, β is the angle between the bridge-dropping equipment and the horizontal direction, and γ is the projection angle of the bridge slope angle in the bridge-dropping direction; according to the bridge-dropping force F 落桥 Choose the appropriate type of hydraulic cylinder according to the size.

6. A method for constructing a steel truss bridge by pushing and lowering the bridge according to any one of claims 1 to 3, characterized in that: The specific steps of carrying out bridge lowering construction on the steel truss bridge in step S400 are as follows: S410, synchronously start each lifting hydraulic cylinder to slowly lift the bridge to a certain height, so that the bridge is separated from the original supporting point; S420, remove the temporary support structure at the original support point to ensure that the steel truss bridge can land smoothly on the pier; S430, slowly lowering the height of the hydraulic jack to gradually lower the bridge; during the lowering process, monitoring the displacement and stress of the bridge in real time; S440. When the bridge approaches the designed position of the pier stress point, slow down the falling speed and make precise adjustments to ensure that the bridge falls accurately at the designed position.

7. A steel truss bridge top-pushing and bridge-dropping equipment, used in the steel truss bridge top-pushing and bridge-dropping construction method as claimed in any one of claims 1 to 6, characterized in that: The invention comprises a walking-type pushing mechanism, wherein the walking-type pushing mechanism comprises a mounting base (1) and a moving box (2); the upper surface of the mounting base (1) is provided with a moving box (2), and the moving box (2) can move forward and backward on the upper surface of the mounting base (1); a lifting hydraulic cylinder (3) is provided on the inner side of the moving box (2), and lateral adjustment hydraulic cylinders (4) are symmetrically provided on both sides of the moving box (2), and the output end of the lateral adjustment hydraulic cylinder (4) is connected to the lifting hydraulic cylinder (3); the rear end of the mounting base (1) is provided with a longitudinal pushing hydraulic cylinder (5), and the output end of the longitudinal pushing hydraulic cylinder (5) is connected to the moving box (2); and the mechanism is used to drive the moving box (2), the lifting hydraulic cylinder (3) and the lateral adjustment hydraulic cylinder (4) to move forward and backward.

8. The steel truss bridge top-pushing and bridge-dropping equipment according to claim 7 is characterized in that: The bottom of both sides of the mounting base (1) are symmetrically provided with fixing edges (11), and the fixing edges (11) are evenly provided with a plurality of fixing holes (12) from front to back; a limit platform (14) is provided at the rear end of the upper surface of the mounting base (1), and a through hole (15) is provided in the middle of the limit platform (14); and a slide groove (13) is provided along the front of the limit platform (14) on the upper surface of the mounting base (1).

9. The steel truss bridge top-pushing and bridge-dropping equipment according to claim 8 is characterized in that: The movable box (2) is symmetrically provided with mounting sleeves (21) on both sides, and a plurality of fixing grooves (22) are evenly provided at one end of the mounting sleeves (21) facing the outer side surface. A connecting hole (23) is provided at a position aligned with the through hole (15) on the rear end surface of the movable box (2), and a groove (24) is provided along the periphery of the connecting hole (23) on the inner side surface of the movable box (2); the bottom of the movable box (2) is inserted into the slide groove (13), and the bottom surface of the movable box (2) is provided with a mounting groove (25), and rollers (26) are evenly provided inside the mounting groove (25), and the rollers (26) are used to reduce the friction between the movable box (2) and the mounting base (1).

10. The steel truss bridge top-pushing and bridge-dropping equipment according to claim 9 is characterized in that: A support platform (31) is provided at the top of the output end of the lifting hydraulic cylinder (3); connecting platforms (32) are provided on both sides of the lifting hydraulic cylinder (3) so as to align with the position of the transverse adjustment hydraulic cylinder (4); a fixed end plate (41) is provided at the output end of the transverse adjustment hydraulic cylinder (4); the fixed end plate (41) is connected to the connecting platform (32) via a fixing bolt (42); a connecting plate (43) is provided at one end of the transverse adjustment hydraulic cylinder (4) facing outwards; a plurality of countersunk holes (44) are evenly arranged on the edge of the connecting plate (43); the bolts pass through the countersunk holes (44) ) is connected to the mobile box (2); a mounting ring (51) is provided on the side of the longitudinal pushing hydraulic cylinder (5), a plurality of mounting holes (52) are evenly arranged on the mounting ring (51), and the mounting ring (51) is fixed to the mounting base (1) by bolts; and a hydraulic telescopic rod (53) is provided at the output end of the longitudinal pushing hydraulic cylinder (5), and a stud (54) is provided at the output of the hydraulic telescopic rod (53), and the stud (54) passes through the connecting hole (23), and a nut (55) is provided at one end of the stud (54) passing through the connecting hole (23).

Images