Large-span steel truss bridge cantilever pushing and traction equipment in narrow area of alpine and canyon

Abstract

The invention discloses a large-span steel truss bridge cantilever pushing and traction device in a mountain and valley narrow area, and relates to the technical field of pushing and traction devices, the large-span steel truss bridge cantilever pushing and traction device comprises a leveling assembly, a pushing counter-force seat, a controller and a centering assembly, the bottom of the leveling assembly is fixedly connected with the top of the centering assembly, and the leveling assembly comprises a bottom plate. In the scheme, five electric push rods are started to drive five first rotating blocks to rotate on five fixing shafts and five second rotating blocks to rotate on connecting rods, so that a placing plate and connecting columns can be driven to rotate along the fixing rods, and the placing plate can be horizontally adjusted until the placing plate and the steel truss segment are in a horizontal state; according to the steel truss section pushing and pulling device, the levelness and stability during pushing and pulling are guaranteed, the follow-up pushing and pulling efficiency of the steel truss section is improved, then three hydraulic cylinders are started through a controller, and under the action of two side columns, two strip-shaped grooves and two strip-shaped sliding blocks, the three hydraulic cylinders drive a containing plate and the steel truss section to be pushed forwards.

Description

Technical Field

[0001] This invention relates to the field of pushing and traction equipment technology, specifically to a cantilever pushing and traction equipment for large-span steel truss bridges in narrow mountain and canyon areas. Background Technology

[0002] When constructing long-span steel truss bridges in narrow mountain valleys with extremely limited space, conventional bridge-building equipment (bridge erecting machines, cranes) is simply not feasible. Steel truss bridges are constructed by splicing steel sections into truss units, resulting in lightweight, large spans, and high rigidity. Therefore, steel truss bridge construction involves segmented assembly and gradual extension. First, the initial steel truss segment is assembled and firmly fixed to pre-embedded anchor points on the abutment or pier using anchoring devices, forming the initial anchoring section. This serves as the foundation for subsequent construction, preventing overall slippage and overturning. Then, on a narrow assembly platform on the valley side, individual steel truss segments are assembled, with bolted or welded joints forming pushable truss units. Next, a pushing device is attached to the rear end of the assembled truss segment, and a hydraulic jacking cylinder applies forward thrust. Simultaneously, a traction device connected to the front end of the truss segment via a traction wire rope applies forward traction using a winch.

[0003] In existing technology, steel truss segments need to be moved to designated positions by a pushing device. After the new segment slides to the cantilever end, it is spliced ​​and reinforced with the already erected truss to form a longer cantilever segment. Then the pushing and traction equipment is reset, and the assembly of the next segment continues until the entire bridge steel truss is erected. However, when pushing the steel truss segments, there is a left-right slope deviation between the ground in the high mountain valley and the bridge abutment. That is, when the steel truss segment is placed on the pushing and placement plate, there will be a left-right height difference. Since the current pushing device does not have adjustability, it is impossible to ensure the horizontality of the steel truss segment during pushing, thus reducing the efficiency of pushing and traction of the steel truss segment.

[0004] Therefore, we proposed a cantilever pushing and traction device for large-span steel truss bridges in narrow mountain and canyon areas to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a cantilever pushing and traction device for large-span steel truss bridges in narrow mountain and canyon areas, in order to solve the problem mentioned in the background art that when the steel truss segments are located on the pushing and placing plate, there will be a difference in height between the left and right sides, and the current pushing device does not have an adjustment function.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cantilever pushing and traction device for a large-span steel truss bridge in narrow mountain and canyon areas, comprising a leveling component, a pushing reaction seat, a controller, and a centering component, wherein the bottom of the leveling component is fixedly connected to the top of the centering component;

[0007] The leveling assembly includes a base plate, with two side posts fixedly mounted on the top of the base plate. Each side post has a strip groove on one side of its outer wall, and a strip slider is movably embedded in the inner wall of each strip groove. A fixing plate is fixedly mounted between the outer walls of the two strip sliders. Two first fixing blocks are fixedly mounted on the top of the fixing plate, and a fixing rod is fixedly mounted between the outer walls of the two first fixing blocks. A connecting post is movably sleeved on the outer wall of the fixing rod, and a placement plate is fixedly mounted on the top of the connecting post. Five rectangular slots are formed at the bottom of the placement plate, and a fixing shaft is fixedly mounted on the inner wall of each of the five rectangular slots. A first rotating block is rotatably connected to the outer wall of each of the five fixing shafts. Two second fixing blocks are fixedly mounted on the top of the fixing plate, and a connecting rod is fixedly mounted between the outer walls of the two second fixing blocks. Five second rotating blocks are rotatably connected to the outer wall of the connecting rod, and the tops of the five second rotating blocks are fixedly connected to the output ends of five electric push rods.

[0008] Preferably, the top of the placement plate is provided with an installation groove, the bottom of the inner wall of the installation groove is fixedly installed with a first displacement sensor, the top of the placement plate is fixedly installed with a strip plate, and the top of the placement plate is provided with two moving grooves.

[0009] Preferably, the inner walls of both movable slots are movably fitted with sliding blocks, a rectangular plate is fixedly installed on the top of the placement plate, and a screw with a handle is threadedly connected to one side of the outer wall of the rectangular plate.

[0010] Preferably, a strip clamp is rotatably connected to one side of the outer wall of the screw with handle, and the bottom of the strip clamp is fixedly connected to the top of two sliding blocks. A protrusion is fixedly installed on one side of the outer wall of the placement plate, and a tension sensor is fixedly installed on the top of the protrusion. A second displacement sensor is fixedly installed on the top of one of the side columns.

[0011] Preferably, three hydraulic cylinders are fixedly installed on one side of the outer wall of the push reaction seat, and a connecting plate is fixedly installed between the output ends of the three hydraulic cylinders, with one side of the connecting plate fixedly connected to the opposite side of the outer wall of the fixed plate.

[0012] Preferably, the centering component includes three dual-axis motors and six fixed columns, with the tops of the three dual-axis motors fixedly connected to the bottom of the base plate, threaded rods fixedly installed on both sides of the outer walls of the three dual-axis motors, and movable blocks threadedly connected to the outer walls of the six threaded rods.

[0013] Preferably, three guide rods are fixedly installed between one side of the outer wall of the six fixed columns, and two guide blocks are movably sleeved on the outer wall of each of the three guide rods. The top of each of the six guide blocks is fixedly connected to the bottom of the six movable blocks, and a first connecting block is fixedly installed on both sides of the outer wall of each of the six movable blocks.

[0014] Preferably, two first connecting blocks form a group, and a first support shaft is fixedly installed between one side of the outer wall of each of the six groups of first connecting blocks. A first push rod is rotatably connected to the outer wall of each of the six first support shafts. A limit groove is opened on one side of the outer wall of each of the six fixed columns, and a groove-shaped slider is movably embedded in the inner surface of each of the six limit grooves.

[0015] Preferably, a second support shaft is fixedly installed on the inner wall of each of the six grooved sliders, and the inner wall of each of the six first push rods is rotatably connected to the outer wall of each of the six second support shafts. A third support shaft is fixedly installed on the inner wall of each of the six grooved sliders, and a second push rod is rotatably connected to the outer wall of each of the six third support shafts. A limit rod is fixedly installed on one side of the outer wall of each of the six fixed columns.

[0016] Preferably, each of the six limiting rods has an L-shaped centering plate movably fitted on its outer wall, and each of the six limiting rods has a locking ring fixedly fitted on its outer wall. Two second connecting blocks are fixedly installed on one side of the outer wall of each of the six L-shaped centering plates, and the two second connecting blocks form a group. A fourth support shaft is fixedly installed between the outer walls of each of the six groups of second connecting blocks, and the inner surface of each of the six second push rods is rotatably connected to the outer surface of the six fourth support shafts.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. When leveling the placement plate is required, the controller activates five electric push rods, which drive five first rotating blocks to rotate on five fixed shafts, and five second rotating blocks to rotate on connecting rods. This causes the placement plate and connecting columns to rotate along the fixed rods, thus adjusting the placement plate horizontally until the placement plate and steel truss segments are in a horizontal state. This ensures the horizontality and stability during pushing and traction, which is beneficial to the efficiency of subsequent pushing and traction. Then, the controller activates three hydraulic cylinders, which, under the action of two side columns, two strip grooves, and two strip sliders, drive the placement plate and steel truss segments forward.

[0019] 2. When the steel truss segment is placed on the placement plate and against the strip plate, rotate the screw with handle. Under the action of the two moving slots and the two sliding blocks, it will drive the two strip plates forward and place the steel truss segment between the strip plate and the strip plates, thus achieving a preliminary limiting effect.

[0020] 3. The first displacement sensor can monitor the lateral displacement deviation of the steel truss segment on the placement plate. When the deviation exceeds the preset value, the controller starts the corresponding dual-axis motor, which drives the two threaded rods to rotate. Under the action of the two guide rods and four guide blocks, the motor drives the four moving blocks to move stably. Since the two first push rods rotate on the two first support shafts and the two second support shafts, and the two second push rods rotate on the two third support shafts and the two fourth support shafts, and the two grooved sliders move in the two limit grooves at the same time, and the two L-shaped centering plates move linearly on the two limit rods, the dual-axis motor can drive the two L-shaped centering plates to move towards the center at the same time until the steel truss segment is moved to the center position, thereby improving the stability of pushing the steel truss segment. Attached Figure Description

[0021] Figure 1 This is a perspective view of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow area of ​​a high mountain canyon according to the present invention.

[0022] Figure 2 This is a front view of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0023] Figure 3 This is a side view of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0024] Figure 4 This is an exploded view of the leveling components of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0025] Figure 5 This is a partial exploded view of the leveling component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0026] Figure 6 This is a schematic diagram of the leveling component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0027] Figure 7 This is a bottom-view exploded view of the leveling component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0028] Figure 8 This is a schematic diagram of the centering component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0029] Figure 9 This is a left view of the central component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0030] Figure 10This is a right view of the central component of the cantilever pushing and traction device for a large-span steel truss bridge in a narrow mountain valley area according to the present invention.

[0031] In the picture:

[0032] 1. Leveling assembly; 101. Base plate; 102. Side post; 103. Strip groove; 104. Strip slider; 105. Fixing plate; 106. First fixing block; 107. Fixing rod; 108. Connecting post; 109. Placement plate; 110. Rectangular groove; 111. Fixing shaft; 112. First rotating block; 113. Second fixing block; 114. Connecting rod; 115. Second rotating block; 116. Electric push rod; 117. Mounting groove; 118. First displacement sensor; 119. Strip plate; 120. Moving groove; 121. Sliding block; 122. Rectangular plate; 123. Screw with handle; 124. Strip clamping plate; 125. Protrusion; 126. Tension sensor; 127. Second displacement sensor; 2. Push reaction seat; 3. Hydraulic cylinder; 4. Connecting plate; 5. Controller; 6. Centering component; 601. Dual-axis motor; 602. Fixed column; 603. Threaded rod; 604. Moving block; 605. Guide rod; 606. Guide block; 607. First connecting block; 608. First support shaft; 609. First push rod; 610. Limiting groove; 611. Groove slider; 612. Second support shaft; 613. Third support shaft; 614. Second push rod; 615. Limiting rod; 616. L-shaped centering plate; 617. Locking ring; 618. Second connecting block; 619. Fourth support shaft. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1-10 The present invention provides a technical solution: a cantilever pushing and traction device for a large-span steel truss bridge in narrow mountain valleys, including a leveling component 1, a pushing reaction seat 2, a controller 5 and a centering component 6, wherein the bottom of the leveling component 1 is fixedly connected to the top of the centering component 6.

[0035] The leveling assembly 1 includes a base plate 101. Two side posts 102 are fixedly mounted on the top of the base plate 101. Each side post 102 has a strip groove 103 on one side of its outer wall. A strip slider 104 is movably embedded in the inner surface of each strip groove 103. A fixing plate 105 is fixedly mounted between the outer walls of the two strip sliders 104. Two first fixing blocks 106 are fixedly mounted on the top of the fixing plate 105. A fixing rod 107 is fixedly mounted between the outer walls of the two first fixing blocks 106. A connecting post 108 is movably sleeved on the outer wall of the fixing rod 107. A placement plate 109 is fixedly installed on the top of the plate 105. Five rectangular slots 110 are opened at the bottom of the placement plate 109. A fixed shaft 111 is fixedly installed on the inner surface of each of the five rectangular slots 110. A first rotating block 112 is rotatably connected to the outer surface of each of the five fixed shafts 111. Two second fixed blocks 113 are fixedly installed on the top of the plate 105. A connecting rod 114 is fixedly installed between one side of the outer surface of the two second fixed blocks 113. Five second rotating blocks 115 are rotatably connected to the outer surface of the connecting rod 114. The top of each of the five second rotating blocks 115 is fixedly connected to the output end of five electric push rods 116.

[0036] In this embodiment, the controller 5 is electrically connected to the five electric push rods 116, the three dual-axis motors 601, the first displacement sensor 118, the second displacement sensor 127, and the tension sensor 126, all of which enable automated control. When it is necessary to push the steel truss segment to a designated position, it is initially positioned on the placement plate 109. Since a tension sensor 126 is installed on the protrusion 125 on one side of the placement plate 109, and the tension sensor 126 is connected to the winch at the other end of the mountain valley via a traction steel wire rope, the controller 5 starts the three hydraulic cylinders 3, which drive the connecting plate 4 and the fixing plate 105 to move. Since the strip sliders 104 installed on both sides of the fixing plate 105 are movably embedded in the strip grooves 103 opened on the two side columns 102, they drive the fixing plate 105 and the positioned steel truss segment forward. Under the action of the second displacement sensor 127, the pushing distance can be calculated, and at this time, the value of the tension sensor 126 must be consistent with that of the three hydraulic cylinders. When the output values ​​match, synchronous pushing and traction can be achieved. Because there are left and right slope deviations between the ground and the bridge abutment in high mountain valleys, a level is placed on the placement plate 109. Feedback from the level is used to simultaneously activate five electric push rods 116 via the controller 5. Since the first rotating blocks 112 installed at the output ends of the five electric push rods 116 are rotatably connected to fixed shafts 111 within five rectangular slots 110, and the five second rotating blocks 115 installed at their bottoms are rotatably connected to connecting rods 114, the extension and retraction of the five electric push rods 116 can drive the five first rotating blocks 112 to rotate on the five fixed shafts 111, and the five second rotating blocks 115 to rotate on the connecting rods 114. This causes the connecting column 108 installed at the bottom of the other side of the placement plate 109 to rotate on the fixed rod 107, thereby adjusting the left and right horizontal position of the placement plate 109, ensuring its levelness and stability during pushing and traction, thus improving the practicality of the pushing and traction device.

[0037] like Figures 1-5As shown, a mounting groove 117 is provided on the top of the placement plate 109. A first displacement sensor 118 is fixedly installed on the bottom of the inner wall of the mounting groove 117. A strip plate 119 is fixedly installed on the top of the placement plate 109. Two moving grooves 120 are provided on the top of the placement plate 109. Sliding blocks 121 are movably embedded in the inner surface of each of the two moving grooves 120. A rectangular plate 122 is fixedly installed on the top of the placement plate 109. A screw with a handle 123 is threadedly connected to one side of the outer wall of the rectangular plate 122. A strip plate 119 is rotatably connected to one side of the outer wall of the screw with a handle 123. The clamping plate 124 is fixedly connected to the bottom of the two sliding blocks 121. A protrusion 125 is fixedly installed on one side of the outer wall of the placement plate 109. A tension sensor 126 is fixedly installed on the top of the protrusion 125. A second displacement sensor 127 is fixedly installed on the top of one of the side pillars 102. Three hydraulic cylinders 3 are fixedly installed on one side of the outer wall of the push reaction seat 2. A connecting plate 4 is fixedly installed between the output ends of the three hydraulic cylinders 3. One side of the connecting plate 4 is fixedly connected to the opposite side of the outer wall of the fixed plate 105.

[0038] In this embodiment, when it is necessary to push and pull the steel truss segment, it is placed on the placement plate 109 and simultaneously against the strip plate 119. Then, the screw with handle 123 is rotated. Since the two sliding blocks 121 installed at the bottom of the strip clamp 124 are movably embedded in the two moving slots 120 opened at the top of the placement plate 109, and one end of the screw with handle 123 is rotatably connected to one side of the strip clamp 124, the strip clamp 124 can be driven to move stably to one side of the strip plate 119, and the steel truss segment is initially limited on the placement plate 109, thereby improving the stability of pushing and pulling it.

[0039] like Figures 1-3 and Figures 8-10As shown, the centering component 6 includes three dual-axis motors 601 and six fixed posts 602. The tops of the three dual-axis motors 601 are fixedly connected to the bottom of the base plate 101. Threaded rods 603 are fixedly installed on both sides of the outer walls of the three dual-axis motors 601. Moving blocks 604 are threadedly connected to the outer walls of the six threaded rods 603. Three guide rods 605 are fixedly installed between the outer walls of the six fixed posts 602. Two guide blocks 606 are movably sleeved on the outer walls of the three guide rods 605. The tops of the six guide blocks 606 are fixedly connected to the bottoms of the six moving blocks 604. First connecting blocks 607 are fixedly installed on both sides of the outer walls of the six moving blocks 604. Two first connecting blocks 607 form a group. First support shafts 608 are fixedly installed between the outer walls of the six groups of first connecting blocks 607. First push rods 609 are rotatably connected to the outer walls of the six first support shafts 608. Limiting grooves 610 are formed on one side of the outer walls of the six fixed posts 602. The inner surface of each of the six slotted sliders 610 is movably fitted with a grooved slider 611. A second support shaft 612 is fixedly installed on the inner surface of each of the six slotted sliders 611. The inner surface of each of the six first push rods 609 is rotatably connected to the outer surface of each of the six second support shafts 612. A third support shaft 613 is fixedly installed on the inner surface of each of the six slotted sliders 611. A second push rod 614 is rotatably connected to the outer surface of each of the six third support shafts 613. A limit rod 615 is fixedly installed on one side of the outer wall of each of the six fixed posts 602. The outer walls of the six limiting rods 615 are movably fitted with L-shaped center plates 616, and the outer walls of the six limiting rods 615 are fixedly fitted with locking rings 617. Two second connecting blocks 618 are fixedly installed on one side of the outer wall of each of the six L-shaped center plates 616. The two second connecting blocks 618 form a group. A fourth support shaft 619 is fixedly installed between the outer walls of the six groups of second connecting blocks 618. The inner walls of the six second push rods 614 are rotatably connected to the outer walls of the six fourth support shafts 619.

[0040] In this embodiment, a mounting groove 117 is provided at the top center of the placement plate 109, and a first displacement sensor 118 is installed in the mounting groove 117. After the steel truss segment is initially positioned on the placement plate 109, due to strong winds in high mountain and canyon areas interfering with the pushing and pulling of the steel truss segment, the first displacement sensor 118 detects that the left and right displacement deviation of the steel truss segment exceeds the original set value. Then, the controller 5 activates one of the dual-axis motors 601 in the centering component 6. The centering component 6 can be evenly distributed along the pushing and pulling path of the steel truss segment as needed. The threaded rods 603 mounted on both sides of the movable block 604 rotate simultaneously inside the two fixed posts 602. Since a guide rod 605 is installed between the two fixed posts 602, and the guide blocks 606 mounted at the bottom of the two movable blocks 604 are movably sleeved on the guide rod 605, the two movable blocks 604 can be driven to move stably relative to or towards each other along the two threaded rods 603. Furthermore, since two first fixed blocks 106 are installed on each of the two movable blocks 604, and a first support shaft 608 is installed within each of the two first fixed blocks 106, and a limiting groove 610 is formed on one side of each of the two fixed posts 602, the limiting groove 610... Each of the two slotted sliders 611 is movably embedded within the two first push rods 609, and both ends of the first push rods 609 are rotatably connected to the two first support shafts 608 and the two second support shafts 612 within the two slotted sliders 611. Thus, by moving the two moving blocks 604, the two slotted sliders 611 can be driven to move upward along the two limiting grooves 610. Furthermore, because the two L-shaped centering plates 616 are movably fitted onto the two limiting rods 615, and under the action of the two locking rings 617, the two L-shaped centering plates 616 are prevented from detaching from the two limiting rods 615. Finally, two second connecting blocks 618 are installed on one side of each of the two L-shaped centering plates 616. Two fourth support shafts 619 are installed in the four second connecting blocks 618, and the two ends of the two second push rods 614 are rotatably connected to the two fourth support shafts 619 and the two third support shafts 613 installed in the two grooved sliders 611. Thus, the two grooved sliders 611 move upward, and the length of the two second push rods 614 remains unchanged. This allows the two L-shaped centering plates 616 to move relative to each other along the two limit rods 615 at the same time, thereby compensating for the left and right displacement of the steel truss segment on the placement plate 109. This further improves the stability when pushing and pulling the steel truss segment, thus improving the practicality of the pushing and pulling device.

[0041] The usage and working principle of this device are as follows: First, connect the traction steel wire rope on the winch at the other end of the mountain valley to the tension sensor 126 installed on the protrusion 125. Then, place the assembled steel truss segment on the placement plate 109 and against the strip plate 119. Rotate the handle screw 123. Since the two sliding blocks 121 installed at the bottom of the strip plate 124 are movably embedded in the two moving slots 120, the strip plate 124 moves stably, initially limiting the steel truss segment to the middle position on the placement plate 109. Then, through the function of the level installed on the placement plate 109, the levelness of the placement plate 109 and the steel truss segment can be detected in real time. When it is not level, the controller 5 will start the installation of the fifth... The electric push rod 116 on the second rotating block 115 drives the five first rotating blocks 112 to rotate simultaneously on the five fixed shafts 111, and the five second rotating blocks 115 rotate on the connecting rod 114. This causes the placement plate 109 and the connecting column 108 to rotate along the fixed rod 107, thus allowing the placement plate 109 and the steel truss segment to be horizontally adjusted to a horizontal position. Then, the controller 5 simultaneously activates the three hydraulic cylinders 3. Since the placement plate 109 is mounted on the fixed plate 105 via two first fixed blocks 106 and two second fixed blocks 113, and the strip-shaped sliders 104 mounted on both sides of the fixed plate 105 are movably embedded in the two strip grooves 103, the three hydraulic cylinders 3 can drive the connecting plate 4 and the fixed plate. 105, along with the placement plate 109 and the steel truss segment, are advanced forward. Meanwhile, at the other end, a winch, traction wire rope, and tension sensor 126 pull the placement plate 109. The balance is maintained by the values ​​between the second displacement sensor 127 and the tension sensor 126, as well as the thrust of the three hydraulic cylinders 3, ensuring synchronous pushing and pulling of the placement plate 109 and the steel truss segment. Because a first displacement sensor 118 is installed in the mounting slot 117 at the top of the placement plate 109, the strong winds in the high mountain valley will affect the lateral displacement of the steel truss segment on the placement plate 109. When the first displacement sensor 118 detects a change in the position of the steel truss segment exceeding a preset value, it controls... Device 5 activates the dual-axis motor 601 in the corresponding area. Under the action of guide rod 605 and two guide blocks 606, it can drive two moving blocks 604 to move towards each other along two threaded rods 603. This causes the two first push rods 609 to rotate on the first support shaft 608 in the two first connecting blocks 607 and the second support shaft 612 in the two slotted sliders 611. At this time, the two slotted sliders 611 will move upward along the two limiting grooves 610, thereby driving the two second push rods 614 to rotate on the two third support shafts 613 and the two fourth support shafts 619. Then, the two L-shaped centering plates 616 move towards the center position along the two limiting rods 615, ensuring that the steel truss segment is always located in the center position on the placement plate 109.Furthermore, it can compensate for the displacement of steel truss segments caused by strong winds in high mountain valleys, improving the stability of pushing and pulling the placement plate 109 and steel truss segments, thereby enhancing the practicality of the cantilever pushing and pulling equipment for large-span steel truss bridges in narrow mountain valley areas.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-span steel truss bridge cantilever pushing and pulling equipment for high mountain and narrow valley narrow area, comprising a leveling assembly (1), a pushing counterforce seat (2), a controller (5) and a centering assembly (6), characterized in that: The bottom of the leveling assembly (1) is fixedly connected with the top of the centering assembly (6); ​ The leveling assembly (1) comprises a bottom plate (101), the top of the bottom plate (101) is fixedly provided with two side columns (102), the outer wall of the two side columns (102) is provided with a strip-shaped slot (103) on one side, the inner surface wall of the two strip-shaped slots (103) is movably provided with a strip-shaped sliding block (104), the outer wall of the two strip-shaped sliding blocks (104) is fixedly provided with a fixed plate (105) between one side, the top of the fixed plate (105) is fixedly provided with two first fixed blocks (106), the outer wall of the two first fixed blocks (106) is fixedly provided with a fixed rod (107) between one side, the outer surface wall of the fixed rod (107) is movably provided with a connecting column (108), the top of the connecting column (108) is fixedly provided with a placing plate (109), the bottom of the placing plate (109) is provided with five rectangular slots (110), the inner surface wall of the five rectangular slots (110) is fixedly provided with a fixed shaft (111), the outer surface wall of the five fixed shafts (111) is rotatably connected with a first rotating block (112), the top of the fixed plate (105) is fixedly provided with two second fixed blocks (113), the outer wall of the two second fixed blocks (113) is fixedly provided with a connecting rod (114) between one side, the outer surface wall of the connecting rod (114) is rotatably connected with five second rotating blocks (115), and the top of the five second rotating blocks (115) is fixedly connected with the output end of five electric push rods (116).

2. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 1, characterized in that: The top of the placing plate (109) is provided with an installation slot (117), the inner wall of the installation slot (117) is fixedly provided with a first displacement sensor (118) at the bottom, the top of the placing plate (109) is fixedly provided with a strip-shaped plate (119), and the top of the placing plate (109) is provided with two moving slots (120).

3. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 2, characterized in that: The inner surface wall of the two moving slots (120) is movably provided with a sliding block (121), the top of the placing plate (109) is fixedly provided with a rectangular plate (122), and the outer wall of the rectangular plate (122) is threadedly connected with a handle screw rod (123) on one side.

4. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 3, characterized in that: The outer wall of the handle screw rod (123) is rotatably connected with a strip-shaped clamping plate (124) on one side, the bottom of the strip-shaped clamping plate (124) is fixedly connected with the top of the two sliding blocks (121), the outer wall of the placing plate (109) is fixedly provided with a protruding block (125) on one side, the top of the protruding block (125) is fixedly provided with a tension sensor (126), and the top of one side column (102) is fixedly provided with a second displacement sensor (127).

5. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 4, characterized in that: The outer wall of the pushback reaction seat (2) is fixedly provided with three hydraulic cylinders (3) on one side, the output end of the three hydraulic cylinders (3) is fixedly provided with a connecting plate (4) between, and the outer wall of the connecting plate (4) is fixedly connected with the opposite side of the fixed plate (105).

6. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 5, characterized in that: The centering assembly (6) includes three double-shaft motors (601) and six fixed columns (602), and the top of each of the three double-shaft motors (601) is fixedly connected with the bottom of the bottom plate (101), the outer wall of each of the three double-shaft motors (601) is fixedly installed with a threaded rod (603), and the outer wall of each of the six threaded rods (603) is threadedly connected with a moving block (604).

7. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 6, characterized in that: The outer wall of each of the six fixed columns (602) is fixedly installed with a guide rod (605), the outer wall of each of the three guide rods (605) is movably sleeved with two guide blocks (606), the top of each of the six guide blocks (606) is fixedly connected with the bottom of each of the six moving blocks (604), and the outer wall of each of the six moving blocks (604) is fixedly installed with a first connecting block (607).

8. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 7, characterized in that: Two first connecting blocks (607) form a group, the outer wall of each of the six groups of first connecting blocks (607) is fixedly installed with a first supporting shaft (608), the outer wall of each of the six first supporting shafts (608) is rotatably connected with a first push rod (609), the outer wall of each of the six fixed columns (602) is provided with a limiting groove (610), and the inner wall of each of the six limiting grooves (610) is movably embedded with a groove-shaped sliding block (611).

9. The high mountain and canyon narrow area large-span steel truss bridge cantilever pushing and pulling equipment according to claim 8, characterized in that: The inner wall of each of the six groove-shaped sliding blocks (611) is fixedly installed with a second supporting shaft (612), the inner wall of each of the six first push rods (609) is rotatably connected with the outer wall of each of the six second supporting shafts (612), the inner wall of each of the six groove-shaped sliding blocks (611) is fixedly installed with a third supporting shaft (613), the outer wall of each of the six third supporting shafts (613) is rotatably connected with a second push rod (614), and the outer wall of each of the six fixed columns (602) is fixedly installed with a limiting rod (615).

10. The high mountain gorge narrow region long-span steel truss bridge cantilever pushing and pulling equipment according to claim 9, characterized in that: The outer wall of each of the six limiting rods (615) is movably sleeved with an L-shaped centering plate (616), the outer wall of each of the six limiting rods (615) is fixedly sleeved with a lock ring (617), the outer wall of each of the six L-shaped centering plates (616) is fixedly installed with two second connecting blocks (618), two second connecting blocks (618) form a group, the outer wall of each of the six groups of second connecting blocks (618) is fixedly installed with a fourth supporting shaft (619), and the inner wall of each of the six second push rods (614) is rotatably connected with the outer wall of each of the six fourth supporting shafts (619).

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