A steel box girder pushing mechanism and method for overpass

Abstract

The application discloses an overpass high viaduct steel box girder pushing mechanism, which comprises a base, a pushing assembly is arranged on the upper side of the base, two first wheel supporting assemblies are symmetrically arranged on the two sides of the pushing assembly and take the pushing assembly as the center, a second wheel supporting assembly is arranged on each first wheel supporting assembly, and the supporting wheels of the first wheel supporting assembly and the second wheel supporting assembly are horizontally perpendicular to each other; a clamping assembly for meshing and clamping connection with a steel box girder body is arranged on the upper side of the pushing assembly, when the pushing assembly is clamped and connected with the steel box girder body through the clamping assembly, the pushing assembly, the clamping assembly, the first wheel supporting assembly, the second wheel supporting assembly and the limiting clamping assembly are mutually coordinated and matched with each other, the overall friction coefficient of the pushing forward and the transverse deviation displacement of the steel box girder body can be greatly reduced, and the pushing forward of the steel box girder body is more labor-saving and convenient.

Description

Technical Field

[0001] This invention belongs to the field of road and bridge construction technology, specifically relating to a mechanism and method for jacking up a steel box girder of an overpass. Background Technology

[0002] Elevated bridge steel box girders refer to box-shaped beams made of steel, used in the construction of elevated bridges. This structure has advantages such as high load-bearing capacity, good durability, simple and quick construction, and high economy. In modern urban expressways, highways, railways, and bridge projects, elevated bridge steel box girders have become a very common structural form. The fabrication of elevated bridge steel box girders requires the use of high-strength steel, which is processed through cutting, bending, welding, and other techniques. Due to the light weight and high strength of steel structures, compared with traditional concrete bridges, elevated bridge steel box girders can reduce self-weight and lower costs under the same span and load conditions, while also allowing for faster construction, making them more suitable for urban construction and transportation.

[0003] A hydraulic jacking device for steel box girders, with application number 202220997084.0, includes a hydraulic jacking platform and a pushing mechanism disposed on the hydraulic jacking platform. The pushing mechanism includes a slider, a driving mechanism, and a guiding mechanism. The output end of the driving mechanism is hinged to the slider. The guiding mechanism includes two symmetrically arranged guiding groups. Each guiding group includes a mounting frame, a mounting plate, multiple guide rods disposed on the mounting plate, and a hydraulic cylinder connected to the mounting frame. The multiple guide rods have different lengths, and the ends of the multiple guide rods are located on the same arc line. However, when the jacking mechanism pushes the steel box girder of the viaduct forward, it separates the steel box girder from the support platform and then drives it to move. This method is relatively laborious and has a large overall friction coefficient. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanism and method for jacking up steel box girders for elevated bridges in order to solve the above-mentioned problems and overcome the defects of the prior art, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a jacking mechanism for a steel box girder of an overpass, including a base, a jacking component on the upper side of the base, two first-wheel support components symmetrically distributed on both sides of the jacking component with the jacking component as the center, and a second-wheel support component on each first-wheel support component. The support wheels of the first-wheel support component and the second-wheel support component are horizontally perpendicular to each other. The upper side of the jacking assembly is provided with a locking component for engaging and locking with the main body of the steel box girder. When the jacking assembly is locked with the main body of the steel box girder through the locking component, the jacking assembly can drive the main body of the steel box girder to move horizontally under the support of the first round support assembly or the second round support assembly.

[0006] Preferably, the push assembly includes a primary platform, a secondary platform, and a tertiary platform arranged sequentially from bottom to top. The primary platform is rectangular in shape, and a second hydraulic cylinder is provided at each of the four lower corners of the primary platform.

[0007] Preferably, a first hydraulic cylinder is fixedly installed on the upper side of the first stage base, a second lug is fixedly installed on the lower side of one end of the second stage base, the push rod head of the first hydraulic cylinder is fixedly connected to the second lug, and one end of several guide rods is fixedly connected to the other end of the second stage base, and the other end of the guide rods is slidably connected to the guide sliding hole opened at the corresponding position of the first lug.

[0008] Preferably, the upper surface of the secondary platform is provided with a first telescopic channel, a third hydraulic cylinder is fixedly installed at one end of the first telescopic channel, a slider is slidably installed in the first telescopic channel, and the upper side of the slider is fixedly connected to the lower side of the tertiary platform.

[0009] Preferably, the locking assembly includes a locking tooth assembly and a limiting locking assembly, wherein the locking tooth assembly includes a first rack and a second rack, the first rack is fixedly disposed on the lower side of the main body of the steel box girder, and the second rack is fixedly disposed on the upper side of the three-stage base. When the push rod of the second oil cylinder reaches a certain stroke, the first rack and the second rack are in a state of meshing connection with each other.

[0010] Preferably, the limiting and locking assembly has two symmetrically distributed around the second rack. The limiting and locking assembly includes a lifting channel opened on the upper surface of the third-level seat. An electric telescopic rod is fixedly installed at the bottom of the inner part of the lifting channel. The push rod head of the electric telescopic rod is fixedly connected to a limiting stop post. The limiting stop post is slidably installed in the lifting channel in the vertical direction.

[0011] Preferably, the first wheel support assembly includes a support platform with a lifting groove inside. A first lifting block is slidably arranged inside the lifting groove. A fourth hydraulic cylinder is fixedly arranged on the bottom surface of the lifting groove. The push rod head of the fourth hydraulic cylinder is fixedly connected to the first lifting block. A plurality of evenly distributed lifting columns are fixedly connected to the upper side of the first lifting block. A lifting sliding hole is slidably connected to the lifting column through the upper side of the support platform. A plurality of evenly distributed first support wheels are rotatably arranged on the upper side of the support platform. The top side of the first support wheel protrudes from the upper surface of the support platform.

[0012] Preferably, the second wheel support assembly includes a fifth hydraulic cylinder, which is fixedly installed inside the support platform. The push rod head of the fifth hydraulic cylinder faces upward and is fixedly connected to a second lifting block. A plurality of second support wheels are rotatably arranged on the upper side of the second lifting block, and the top side of the second support wheels protrudes from the upper surface of the second lifting block.

[0013] Preferably, the upper side of the base is provided with a pressure sensor that corresponds to each of the second oil cylinders and performs independent pressure detection.

[0014] A method for jacking a steel box girder for an overpass viaduct includes the following steps: S1: When the main body of the steel box girder is pushed and moved, the second cylinder push rod of the pushing component extends, thereby driving the third-stage platform to move upward, so that the second rack on the upper side of the third-stage platform and the first rack on the lower side of the main body of the steel box girder mesh with each other. S2: The push rod of the first cylinder extends, thereby driving the second stage seat to move axially along the guide rod, and the meshing of the first rack and the second rack drives the steel box girder body to move horizontally; S3: In step S2, the fifth cylinder push rod of the second wheel support assembly extends, thereby enabling the second support wheel to abut against the bottom side of the steel box girder body. When the first cylinder drives the steel box girder body to move axially along the guide rod, the second support wheel can achieve rolling support for the steel box girder body, reducing the frictional force of movement. S4: When the main body of the steel box girder moves to a certain distance, the push rod of the second oil cylinder retracts, and the main body of the steel box girder descends with the descent of the third-level platform. When the main body of the steel box girder descends to the bottom side and abuts against the upper end of the lifting column, the lifting column provides abutment support for the main body of the steel box girder. S5: When correcting the lateral movement of the main body of the steel box girder, the push rod of the fifth cylinder drives the second support wheel to descend to the lowest position height. The height of the second support wheel is lower than that of the first support wheel. The push rod of the second cylinder extends to drive the first stage platform to move upward. The first rack and the second rack mesh with each other. Then the electric telescopic rod push rod of the limit locking component extends, driving the limit stop column to move upward and abut against both sides of the first rack. The push rods of the second cylinder and the fourth cylinder retract at the same time, thereby driving the main body of the steel box girder to descend until the upper end of the lifting column is lower than the upper side height of the first support wheel. The first support wheel then provides rolling support for the main body of the steel box girder. S6: In step S5, the extension and retraction of the push rod of the third hydraulic cylinder can drive the three-stage platform to move the main body of the steel box girder under the rolling support of the first support wheel.

[0015] The beneficial effects are: 1. By coordinating and cooperating with each other, the jacking components, toothed components, first-round support components, second-round support components and limiting and locking components can greatly reduce the overall friction coefficient of the jacking and forward movement of the steel box girder and the lateral correction displacement, making it easier and more convenient to push the steel box girder forward. 2. The toothed assembly can serve as the meshing connection between the jacking assembly and the main body of the steel box girder. Under the rolling support of the main body of the steel box girder by the first round of support assembly, it plays a supporting and limiting role for the main body of the steel box girder. 3. The limiting and locking components can limit the lateral movement between the jacking components and the main body of the steel box girder, thereby providing support and limiting for the main body of the steel box girder under the rolling support of the second round of support components. 4. The first-round support components not only provide rolling support for the main body of the steel box girder, but also provide stable support for its placement. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is the present invention. Figure 1 The right view; Figure 3 This is the present invention. Figure 1 AA cross-section view; Figure 4 This is the present invention. Figure 2 BB cross-section; Figure 5 This is the present invention. Figure 1 A three-dimensional image.

[0018] The reference numerals in the attached drawings are explained as follows: 1. Base; 2. Pushing assembly; 201. First-stage platform; 202. Second-stage platform; 203. First hydraulic cylinder; 204. Third-stage platform; 205. Second hydraulic cylinder; 206. First support lug; 207. Guide rod; 208. Second support lug; 209. First telescopic channel; 210. Third hydraulic cylinder; 211. Sliding block; 3. Gear assembly; 301. First rack; 302. Second rack; 4. First wheel support Support assembly; 401, support platform; 402, lifting slide; 403, first lifting block; 404, fourth hydraulic cylinder; 405, lifting column; 406, first support wheel; 5, second wheel support assembly; 501, fifth hydraulic cylinder; 502, second lifting block; 503, second support wheel; 6, main body of steel box girder; 7, limit locking assembly; 701, lifting channel; 702, limit stop column; 703, electric telescopic rod; 8, pressure sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] See Figures 1-5 As shown, this invention provides a jacking mechanism for a steel box girder of an overpass, including a base 1. In practical applications, the base 1 has several mounting holes, which allow for installation and fixation to bridge piers, supports, etc. A jacking assembly 2 is provided on the upper side of the base 1. Two first-wheel support assemblies 4 are symmetrically distributed on both sides of the jacking assembly 2, with a second-wheel support assembly 5 on each first-wheel support assembly 4. The support wheels of the first-wheel support assembly 4 and the second-wheel support assembly 5 are horizontally perpendicular to each other. The first-wheel support assembly 4 allows for... To achieve rolling support during the advancement and movement of the main body 6 of the steel box girder, reducing the moving friction of the main body 6 of the steel box girder, while the second round support assembly 5 can achieve rolling support during the lateral movement of the main body 6 of the steel box girder, reducing the friction during the lateral correction process of the main body 6 of the steel box girder. The upper side of the jacking assembly 2 is provided with a locking assembly for engaging and locking with the main body 6 of the steel box girder. When the jacking assembly 2 is locked with the main body 6 of the steel box girder through the locking assembly, the jacking assembly 2 can drive the main body 6 of the steel box girder to move horizontally under the support of the first round support assembly 4 or the second round support assembly 5.

[0021] This embodiment proposes a specific jacking assembly 2, which includes a primary platform 201, a secondary platform 202, and a tertiary platform 204 arranged sequentially from bottom to top. The primary platform 201 is rectangular in shape, and a second hydraulic cylinder 205 is provided at the four lower corners of the primary platform 201. A pressure sensor 8 is provided on the upper side of the base 1, which corresponds to each of the second hydraulic cylinders 205 and performs independent pressure detection. A first hydraulic cylinder 203 is fixedly provided on the upper side of the primary platform 201. A second support lug 208 is fixedly provided on the lower side of one end of the secondary platform 202. The push rod head of the first hydraulic cylinder 203 is fixedly connected to the second support lug 208. The other end of a plurality of guide rods 207 is fixedly connected to the other end of the secondary platform 202. The other end of the guide rods 207 is slidably connected to the guide sliding hole opened at the corresponding position of the first support lug 206. The upper surface of the secondary platform 202 is provided with a first telescopic channel 209. A third hydraulic cylinder 210 is fixedly installed at one end of the first telescopic channel 209, and a slider 211 is slidably installed within the first telescopic channel 209. The upper side of the slider 211 is fixedly connected to the lower side of the tertiary platform 204. Through the above specific structural design, the jacking assembly 2 can realize the upward jacking of the steel box girder body 6, as well as the forward advancement and lateral correction after the steel box girder body 6 is jacked up.

[0022] It should be noted that, in order to cooperate with the aforementioned jacking assembly 2, the locking assembly includes a locking tooth assembly 3 and a limiting locking assembly 7. The locking tooth assembly 3 includes a first rack 301 and a second rack 302. The first rack 301 is fixedly installed on the lower side of the steel box girder body 6, and the second rack 302 is fixedly installed on the upper side of the third-stage platform 204. When the push rod of the second hydraulic cylinder 205 reaches a certain stroke, the first rack 301 and the second rack 302 are in a state of mutual meshing. The limiting locking assembly 7 has two symmetrically distributed around the second rack 302. The limiting locking assembly 7 includes a lifting channel 701 opened on the upper surface of the third-stage platform 204. An electric telescopic rod 703 is fixedly installed at the bottom of the lifting channel 701. The push rod head of the electric telescopic rod 703 is fixedly connected to a limiting stop 702. The limiting stop 702 is slidably installed in the lifting channel 701 in the vertical direction. In practical applications, the toothed assembly 3 can serve as the meshing connection between the jacking assembly 2 and the main body of the steel box girder 6. Under the rolling support of the first wheel support assembly 4, the main body of the steel box girder 6 plays a supporting and limiting role.

[0023] To achieve rolling support for the forward movement of the main body 6 of the steel box girder, the first support assembly 4 includes a support platform 401. A lifting slide 402 is provided inside the support platform 401. A first lifting block 403 is slidably arranged inside the lifting slide 402. A fourth hydraulic cylinder 404 is fixedly arranged on the bottom surface inside the lifting slide 402. The push rod head of the fourth hydraulic cylinder 404 is fixedly connected to the first lifting block 403. A number of evenly distributed lifting columns 405 are fixedly connected to the upper side of the first lifting block 403. A lifting slide hole is provided through the upper side of the support platform 401, which is slidably connected to the lifting column 405. A number of evenly distributed first support wheels 406 are rotatably arranged on the upper side of the support platform 401. The top side of the first support wheel 406 protrudes from the upper surface of the support platform 401. The second-round support assembly 5 includes a fifth hydraulic cylinder 501, which is fixedly installed inside the support platform 401. The push rod head of the fifth hydraulic cylinder 501 faces upward and is fixedly connected to a second lifting block 502. Several evenly distributed second support wheels 503 are rotatably arranged on the upper side of the second lifting block 502, and the top side of the second support wheels 503 protrudes from the upper surface of the second lifting block 502. The limiting and locking assembly 7 can limit the lateral movement between the jacking assembly 2 and the steel box girder body 6, thereby providing support and limiting for the steel box girder body 6 under the rolling support of the second-round support assembly 5.

[0024] Working principle: When the main body 6 of the steel box girder is pushed and moved, the push rod of the second cylinder 205 of the pushing assembly 2 extends, thereby driving the third-stage platform 204 to move upward, so that the second rack 302 on the upper side of the third-stage platform 204 meshes with the first rack 301 on the lower side of the main body 6 of the steel box girder; the push rod of the first cylinder 203 extends, thereby driving the second-stage platform 202 to move axially along the guide rod 207, and the meshing of the first rack 301 and the second rack 302 drives the main body 6 of the steel box girder to move horizontally; the second wheel support The push rod of the fifth cylinder 501 of the support assembly 5 extends, thereby enabling the second support wheel 503 to abut against the bottom side of the steel box girder body 6. When the first cylinder 203 drives the steel box girder body 6 to move axially along the guide rod 207, the second support wheel 503 can provide rolling support for the steel box girder body 6, reducing the friction of movement. When the steel box girder body 6 moves to a certain distance, the push rod of the second cylinder 205 retracts, and the steel box girder body 6 descends along with the descent of the third-stage platform 204. When the steel box girder body 6 descends to the bottom side, it is in contact with the lifting mechanism. When the upper end of column 405 abuts, the lifting column 405 provides abutment support for the main body 6 of the steel box girder. When correcting the lateral movement of the main body 6 of the steel box girder, the push rod of the fifth cylinder 501 drives the second support wheel 503 to descend to its lowest position. The height of the second support wheel 503 is lower than the height of the first support wheel 406. The push rod of the second cylinder 205 extends to drive the first stage platform 201 to move upward. The first rack 301 and the second rack 302 mesh with each other, and then the electric telescopic rod 703 of the limit locking assembly 7 is engaged. The push rod extends, driving the limit stop 702 to move upward and abut against both sides of the first rack 301. The push rods of the second cylinder 205 and the fourth cylinder 404 retract simultaneously, thereby driving the steel box girder body 6 to descend until the upper end of the lifting column 405 is lower than the upper side of the first support wheel 406, and the first support wheel 406 provides rolling support for the steel box girder body 6. The push rod of the third cylinder 210 extends and retracts, which can drive the three-stage platform 204 to move the steel box girder body 6 under the rolling support of the first support wheel 406.

[0025] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A jacking mechanism for a steel box girder of an overpass, characterized in that: Includes a base (1), on the upper side of the base (1) is a push assembly (2), and on both sides of the push assembly (2) are two first-wheel support assemblies (4) symmetrically distributed with the push assembly (2) as the center. Each first-wheel support assembly (4) is provided with a second-wheel support assembly (5). The support wheels of the first-wheel support assembly (4) and the second-wheel support assembly (5) are horizontally perpendicular to each other. The upper side of the jacking assembly (2) is provided with a locking assembly for engaging and locking with the main body of the steel box girder (6). When the jacking assembly (2) is locked with the main body of the steel box girder (6) through the locking assembly, the jacking assembly (2) can drive the main body of the steel box girder (6) to move horizontally under the support of the first round support assembly (4) or the second round support assembly (5). The push assembly (2) includes a first-stage platform (201), a second-stage platform (202) and a third-stage platform (204) arranged sequentially from bottom to top. The first-stage platform (201) is rectangular in shape, and a second hydraulic cylinder (205) is provided at the four lower corners of the first-stage platform (201). A first hydraulic cylinder (203) is fixedly installed on the upper side of the first stage base (201), and a second lug (208) is fixedly installed on the lower side of one end of the second stage base (202). The push rod head of the first hydraulic cylinder (203) is fixedly connected to the second lug (208). The other end of the second stage base (202) is fixedly connected to one end of several guide rods (207), and the other end of the guide rods (207) is slidably connected to the guide sliding hole opened at the corresponding position of the first lug (206). The upper surface of the secondary platform (202) is provided with a first telescopic channel (209), a third oil cylinder (210) is fixedly installed at one end of the first telescopic channel (209), and a slider (211) is slidably installed in the first telescopic channel (209). The upper side of the slider (211) is fixedly connected to the lower side of the tertiary platform (204). The locking assembly includes a locking tooth assembly (3) and a limiting locking assembly (7). The locking tooth assembly (3) includes a first rack (301) and a second rack (302). The first rack (301) is fixedly installed on the lower side of the main body of the steel box girder (6), and the second rack (302) is fixedly installed on the upper side of the third-stage seat (204). When the push rod of the second oil cylinder (205) reaches a certain stroke, the first rack (301) and the second rack (302) are in a state of meshing connection with each other. The limiting locking assembly (7) is provided with two symmetrically distributed around the second rack (302). The limiting locking assembly (7) includes a lifting channel (701) opened on the upper surface of the third-level base (204). An electric telescopic rod (703) is fixedly provided at the bottom of the lifting channel (701). The push rod head of the electric telescopic rod (703) is fixedly connected to a limiting stop (702). The limiting stop (702) is slidably provided in the lifting channel (701) in the up and down direction. The first wheel support assembly (4) includes a support platform (401), a lifting slide groove (402) is provided in the support platform (401), a first lifting block (403) is slidably arranged inside the lifting slide groove (402), a fourth oil cylinder (404) is fixedly arranged on the bottom surface inside the lifting slide groove (402), the push rod head end of the fourth oil cylinder (404) is fixedly connected to the first lifting block (403), a number of evenly distributed lifting columns (405) are fixedly connected to the upper side of the first lifting block (403), a lifting slide hole is provided through the upper side of the support platform (401) and is slidably connected to the lifting columns (405) one by one, and a number of evenly distributed first support wheels (406) are rotatably arranged on the upper side of the support platform (401), and the top side of the first support wheel (406) protrudes from the upper surface of the support platform (401). The second wheel support assembly (5) includes a fifth cylinder (501), which is fixedly installed inside the support platform (401). The push rod head of the fifth cylinder (501) faces upward and is fixedly connected to a second lifting block (502). Several second support wheels (503) are evenly distributed on the upper side of the second lifting block (502). The top side of the second support wheel (503) protrudes from the upper surface of the second lifting block (502).

2. The jacking mechanism for a steel box girder of an overpass bridge according to claim 1, characterized in that: The upper side of the base (1) is provided with pressure sensors (8) that correspond one-to-one with each of the second oil cylinders (205) for independent pressure detection.

3. A method for jacking a steel box girder for an overpass, characterized in that: Includes the following steps: S1: When the main body of the steel box girder (6) is pushed and moved, the push rod of the second oil cylinder (205) of the pushing assembly (2) extends, thereby driving the third-stage platform (204) to move upward, so as to realize that the second rack (302) provided on the upper side of the third-stage platform (204) and the first rack (301) provided on the lower side of the main body of the steel box girder (6) mesh with each other; S2: The push rod of the first cylinder (203) extends, thereby driving the secondary platform (202) to move axially along the guide rod (207), and the steel box girder body (6) is moved horizontally by the meshing of the first rack (301) and the second rack (302); S3: In step S2, the push rod of the fifth cylinder (501) of the second wheel support assembly (5) extends, thereby enabling the second support wheel (503) to abut against the bottom side of the steel box girder body (6). When the first cylinder (203) drives the steel box girder body (6) to move axially along the guide rod (207), the second support wheel (503) can achieve rolling support for the steel box girder body (6) and reduce the friction of movement. S4: When the main body of the steel box girder (6) moves to a certain distance, the push rod of the second oil cylinder (205) retracts, and the main body of the steel box girder (6) descends with the descent of the third-level platform (204). When the main body of the steel box girder (6) descends to the point where its bottom side abuts against the upper end of the lifting column (405), the lifting column (405) provides abutment support for the main body of the steel box girder (6). S5: When the steel box girder body (6) is moved laterally to correct its deviation, the push rod of the fifth cylinder (501) drives the second support wheel (503) to descend to the lowest position height. The height of the second support wheel (503) is lower than the height of the first support wheel (406). The push rod of the second cylinder (205) extends to drive the first stage platform (201) to move upward. The first rack (301) and the second rack (302) mesh with each other. Then the push rod of the electric telescopic rod (703) of the limit locking assembly (7) extends, driving the limit stop column (702) to move upward and abut against the two sides of the first rack (301). The push rods of the second cylinder (205) and the fourth cylinder (404) retract at the same time, thereby driving the steel box girder body (6) to descend until the upper end of the lifting column (405) is lower than the upper side height of the first support wheel (406). The first support wheel (406) then provides rolling support for the steel box girder body (6). S6: In step S5, the push rod of the third cylinder (210) extends and retracts, which can drive the third stage platform (204) to move the main body of the steel box girder (6) under the rolling support of the first support wheel (406).

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