Steel beam bridge lower chord member positioning device and positioning method
By designing a steel beam bridge lower chord positioning device including fixed unit, bidirectional telescopic unit and positioning unit, the problem of difficulty in achieving precise positioning of the lower chord during lifting and welding is solved, and the precise positioning and stable installation of the lower chord is achieved , improve construction efficiency and accuracy.
Patent Information
- Application Number
- CN202411771568.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-02-07
AI Technical Summary
The lower chord rod of the steel beam bridge is difficult to accurately position during lifting and welding, resulting in unstable installation. The existing laser positioning method is complex and costly, and is easily affected by wind and mechanical vibration in actual construction, resulting in inaccurate positioning. .
A steel beam bridge lower chord positioning device is designed, including a fixed unit, a bidirectional telescopic unit and a positioning unit. The electric jaw and laser detector are used to achieve precise positioning of the lower chord. The positioning device can move in a crawling manner to ensure that the lower chord is already The installed lower chord is aligned to achieve accurate position.
Through this device, the positioning accuracy of the lower chord rod is improved, the installation stability is enhanced, and the operation is relatively simple, which reduces construction costs and labor needs and improves construction efficiency.
Smart Images
Figure CN119392616A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of steel beam bridge construction, and specifically discloses a steel beam bridge lower chord positioning device and a positioning method. Background Art
[0002] A steel beam bridge is a structural form in which a solid steel plate beam bridge is hollowed out according to certain rules. Overall, it is a beam-type stress-bearing structure, and is mainly subjected to bending moment and shear force. The main structure of a steel beam bridge includes a main beam, a cross beam, a bridge deck, a support, a pier, and abutments. The main beam is the main load-bearing member of a steel beam bridge, and is usually an I-shaped or box-shaped section with high bending strength and rigidity. The cross beam connects the main beam, enhances the overall stability of the bridge, and evenly distributes the load to the main beam. The main beam structure includes an upper chord, a lower chord, and a web. The lower chord and the diagonal web must be hoisted to the top of the pier and fixed. Because the two are connected by welding section by section, and the length of the two is relatively long, it is not convenient for positioning and welding construction, and a device that can accurately position is required.
[0003] Patent No. 2020113834990 discloses a method for positioning and installing the lower chord of a steel truss of a cable-stayed bridge, comprising the following steps: S11, installing support piles and laser transmitters; S12, installing a jacking device, and installing a laser sensor on the side of the lower chord of each pier top section; S13, hoisting the lower chord of the pier top section to a designated position, jacking it with a jacking device, adjusting the lower chord of the pier top section to the designed position of the lower chord using a laser sensor, and installing it; S14, installing a laser sensor on the side of the lower chord of each cantilever section; S15, hoisting the lower chord of the cantilever section to a designated position, adjusting the lower chord of the cantilever section to the designed position of the lower chord using a laser sensor, and installing it; S16, during the tensioning process of the inclined cable, adjusting the lower chord of the cantilever section to the designed line shape of the lower chord using a laser sensor. The method of the invention uses laser to position the lower chord, which can efficiently position the lower chord, greatly improving the positioning accuracy, precise construction, easy operation, manpower saving, and high construction efficiency.
[0004] The above patent uses laser for positioning, which has high accuracy. However, the overall operation of the technical solution is too complicated. Laser sensors need to be installed on the side of the lower chord of each cantilever section. The installation accuracy of the laser sensor equipment is high and the overall cost is also high. It is not practical for positioning the lower chord and the web. At the same time, although the current laser positioning method can accurately locate the installation position, the lower chord will shake during the actual lifting process due to wind force, lifting mechanical vibration and other reasons, resulting in unstable installation. Manual secondary positioning is still required on site. Summary of the invention
[0005] In view of this, the object of the present invention is to provide a positioning device and a positioning method for a lower chord of a steel beam bridge, so as to solve the technical problem of how to position the lower chord.
[0006] In order to achieve the above object, the present invention provides the following technical solutions: A positioning device for a lower chord of a steel beam bridge comprises a fixing unit, a bidirectional telescopic unit and a positioning unit, wherein the fixing unit and the positioning unit are respectively arranged on both sides of the bidirectional telescopic unit; the fixing unit comprises a first electric clamp and a laser reflection point, wherein the first electric clamp comprises two first claw bodies, wherein the laser reflection point is arranged on the first claw body and faces the positioning unit; the positioning unit comprises a second electric clamp and a laser detector, wherein the second electric clamp comprises two second claw bodies, wherein the laser detector is arranged on the second claw body and faces the laser reflection point; and the bidirectional telescopic unit can drive the positioning unit and the fixing unit to move back and forth. In this scheme, the positioning unit and the fixing unit can move on both sides of the bidirectional telescopic unit, so the entire positioning device can crawl, and at the same time, when the lower chord is hoisted onto the positioning unit, the second electric clamp on the positioning unit can push the lower chord to move toward the center of the second electric clamp, i.e., the center of the positioning unit. Since the positioning unit and the fixing unit are aligned, and the fixing unit is fixed on the installed lower chord, the newly hoisted lower chord can be aligned with the installed lower chord after being positioned by the positioning unit, thereby ensuring its accurate position.
[0007] Optionally, a through groove is horizontally arranged on the second claw body, a reset spring is arranged in the through groove body, a compression block is arranged on the reset spring, and the compression block can move into the through groove body when subjected to external force, the laser detector is arranged at the side end of the compression block, and when the compression block moves to the bottom, the laser detector and the laser reflection point are located in the same horizontal plane. The compression block in this scheme is mainly used for buffering, and when the lower chord moves downward, it touches the compression block, and the reset spring below it can play a buffering role, and can also reset the compression block without external force.
[0008] Optionally, the sides of the two first claws are provided with extension frames, and the extension frames are also provided with laser reflection points; the second claw can be driven by the second electric cylinder to move horizontally so that the laser detector can be aligned with the laser reflection point on the first claw or the extension frame. When the lower chord rod is hoisted onto the positioning unit, the excessive mass of the lower chord rod may cause deformation of the fixing unit, and the laser detector can detect whether the positioning unit and the fixing unit are aligned, thereby ensuring the accuracy of positioning.
[0009] Optionally, the bidirectional telescopic unit includes a mounting base and four electric telescopic cylinders, two electric telescopic cylinders are fixedly arranged on the mounting base as a group, and the telescopic directions of the two groups of electric cylinders are opposite; an electromagnet is arranged on the side of the mounting base facing the lower chord rod.
[0010] A positioning method for a lower chord positioning device of a steel beam bridge comprises the following steps: S1, installation, installing the positioning device on the lower chord rod, the first electric clamp of the fixing unit and the second electric clamp of the positioning unit are clamped at the bottom of the lower chord rod, and the electromagnet of the mounting base is started and attracted to the bottom of the lower chord rod; S2, crawling. During crawling, the first electric clamp of the fixed unit is released, and then the two electric telescopic cylinders of the two-way telescopic unit drive the fixed unit to retract, and then the first electric clamp is clamped again; the electromagnet is disconnected, the four electric telescopic cylinders of the two-way telescopic unit are started at the same time, and the two electric telescopic cylinders close to the fixed unit are extended, and the other two electric telescopic cylinders are retracted. After the two-way telescopic unit moves into place, the electromagnet is opened again; the second electric clamp is released, and the electric telescopic cylinder connected to it is extended and drives the positioning unit to move forward, thereby completing one crawling of the positioning device; when the positioning device crawls into place, the positioning unit is in the preset position; S3, ready for installation, the second electric clamp is in a released state; S4, hoisting, hoist the new lower chord to the specified position. When the lower end of the lower chord moves to the second electric clamp, it will touch the compression block. At this time, the vertical position of the lower chord can be determined. Then start the second electric clamp. The second electric clamp can clamp the lower chord and push the lower chord to the center of the second electric clamp to complete the horizontal position positioning. S5, welding, after positioning is completed, the lower chord is welded.
[0011] The working principle and beneficial effects of this solution are: In this solution, the first electric clamp of the fixing unit can be fixed on the installed lower chord, and the second electric clamp of the positioning unit can be extended to the outside. The hoisting machine gradually moves the lower chord to the position of the second electric clamp. When the moving height is in place, the claw body of the second electric clamp moves inward and shrinks, and the claw body can clamp the lower chord. At this time, the fixing unit is clamped at the bottom of the installed lower chord, and the positioning unit is clamped at the bottom of the uninstalled lower chord. As long as the laser detector can successfully detect the reflected laser, it indicates that the uninstalled lower chord is accurately positioned, and the welding process can be carried out. When the lower chord is welded to a certain extent, the first electric clamp of the fixing unit can be gradually loosened, the electromagnet of the bidirectional telescopic unit is started, and the bidirectional telescopic unit drives the fixing unit to retract, and then the fixing unit is clamped on the corresponding lower chord again. At this time, the fixing unit and the positioning unit are both clamped, and then the bidirectional telescopic unit is started to move toward the positioning unit. The above method realizes the crawling of the positioning device at the bottom of the lower chord until the positioning device moves to the specified position for the next positioning. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of an embodiment; Figure 2 It is a schematic diagram of the structure of the fixed unit, the bidirectional telescopic unit and the positioning unit; Figure 3 It is a partial structural schematic diagram of the positioning unit and the bidirectional telescopic unit; Figure 4 for Figure 3 Enlarged view of point A in the middle.
[0013] The markings in the accompanying drawings are as follows: lower chord 1, first electric clamp 2, extension frame 3, mounting base 4, electric telescopic cylinder 5, second electric clamp 6, compression block 7, laser detector 8, first claw body 9, second claw body 10, spring top seat 11, through-groove body 12, compression spring 13, vertical telescopic cylinder 14, universal seat 15, electromagnet 16. DETAILED DESCRIPTION
[0014] The following is further described in detail through specific implementation methods: Example A steel beam bridge lower chord positioning device and positioning method, such as Figure 1-Figure 4 As shown, it includes a fixing unit, a bidirectional telescopic unit and a positioning unit, and the fixing unit and the positioning unit are respectively arranged on both sides of the bidirectional telescopic unit.
[0015] The fixing unit includes a first electric clamp 2 and a laser reflection point. The structure of the first electric clamp 2 belongs to a very common prior art, and there are many types and models on the market, so the specific structure will not be repeated. The first electric clamp 2 can also choose a hydraulic structure. The hydraulic structure has a better clamping effect, but the overall mass is large, the risk of falling is high, and the load on the bidirectional telescopic unit is large. The first electric clamp 2 includes two first claw bodies 9, and the laser reflection point is set on the first claw body 9 and faces the positioning unit. Extension frames 3 are fixedly set on the sides of the two first claw bodies 9, and laser reflection points are also set on the extension frames 3.
[0016] The positioning unit includes a second electric clamp 6 and a laser detector 8. The second electric clamp 6 includes two second claw bodies 10. The laser detector 8 is arranged on the second claw body 10 and is opposite to the laser reflection point. The laser detector 8 is also a very common prior art, and the specific structure is not repeated. A through groove body 12 is horizontally arranged on the second claw body 10, and a reset spring is arranged in the through groove body 12. A compression block 7 is arranged on the reset spring. When the compression block 7 is subjected to external force, it can move into the through groove body 12. The laser detector 8 is arranged at the side end of the compression block 7 and when the compression block 7 moves to the bottom, the laser detector 8 and the laser reflection point are located in the same horizontal plane. The second claw body 10 can move horizontally under the drive of the second electric cylinder so that the laser detector 8 can be aligned with the laser reflection point on the first claw body 9 or the extension frame 3.
[0017] The bidirectional telescopic unit can drive the positioning unit and the fixed unit to move back and forth. The bidirectional telescopic unit includes a mounting base 4 and four electric telescopic cylinders 5. Two electric telescopic cylinders 5 are fixedly arranged on the mounting base 4 as a group, and the telescopic directions of the two groups of electric cylinders are opposite. The mounting base 4 is provided with a vertical telescopic cylinder 14, a compression spring 13, a spring top seat 11, a universal seat 15 and an electromagnet 16; the vertical telescopic cylinder 14 and the compression spring 13 are both fixedly arranged on the mounting base 4, and the vertical telescopic cylinder 14 is located in the hollow part of the compression spring 13. The bottom of the spring top seat 11 is fixedly connected to the top of the vertical telescopic cylinder 14 and the compression spring 13, and the lower end of the spring top seat 11 is integrally formed with a hollow cylindrical limiting cylinder. The universal seat 15 is arranged at the upper end of the spring top seat 11 by a universal connection, and the universal connection is generally a universal joint. The top of the universal seat 15 is a plane, and the electromagnet 16 is installed on the top of the universal seat 15.
[0018] A positioning method for a lower chord positioning device of a steel beam bridge comprises the following steps: S1, installation, installing the positioning device on the lower chord rod 1, the first electric clamping jaw 2 of the fixing unit and the second electric clamping jaw 6 of the positioning unit are clamped at the bottom of the lower chord rod 1, and the electromagnet 16 of the mounting base 4 is started and attracted to the bottom of the lower chord rod 1; S2, crawling. During crawling, the first electric clamp 2 of the fixed unit is released, and then the two electric telescopic cylinders 5 of the two-way telescopic unit drive the fixed unit to retract, and then the first electric clamp 2 is clamped again; the electromagnet 16 is disconnected, the four electric telescopic cylinders 5 of the two-way telescopic unit are started at the same time, and the two electric telescopic cylinders 5 close to the fixed unit are extended, and the other two electric telescopic cylinders 5 are retracted. After the two-way telescopic unit moves into place, the electromagnet 16 is opened again; the second electric clamp 6 is released, and the electric telescopic cylinder 5 connected thereto is extended and drives the positioning unit to move forward, thereby completing one crawling of the positioning device; when the positioning device crawls into place, the positioning unit is in the preset position; S3, ready for installation, the second electric clamp 6 is in a released state; S4, hoisting, hoist the new lower chord rod 1 to the specified position. When the lower end of the lower chord rod 1 moves to the second electric clamp 6, it will touch the compression block 7. At this time, the vertical position of the lower chord rod 1 can be determined. Then start the second electric clamp 6. The second electric clamp 6 can clamp the lower chord rod 1 and push the lower chord rod 1 to the center of the second electric clamp 6 to complete the horizontal position positioning. S5, welding, after the positioning is completed, the lower chord 1 is welded.
[0019] In the positioning method of this solution, if there is an angle deviation when the two lower chords 1 are connected, and the positioning device needs to be moved from one lower chord 1 to another lower chord 1, the positioning method steps need to be improved, and the remaining steps are the same. Step S2 is as follows: S2, crawling, when crawling, the electromagnet 16 is energized, the first electric clamp 2 of the fixed unit is released, the second electric clamp 6 of the positioning unit is released, and then the four electric telescopic cylinders 5 of the two-way telescopic unit drive the fixed unit and the positioning unit to retract, and then the first electric clamp 2 is clamped again, and the second electric clamp 6 remains released; The electromagnet 16 is disconnected, and the two electric telescopic cylinders 5 in the two-way telescopic unit toward the first electric clamp 2 extend until the positioning unit and the two-way telescopic unit are both located below the next lower chord rod 1. At this time, the vertical telescopic cylinder 14 is started, and the spring top seat 11, the universal seat 15 and the electromagnet 16 in the two-way telescopic unit will pop out under the action of the compression spring 13, and the universal seat 15 and the electromagnet 16 will fit with the bottom of the lower chord rod 1 under the thrust of the compression spring 13. At this time, the electromagnet 16 is started again, and the second electric clamp 6 is released at the same time and retracted through the electric telescopic cylinder 5. At this time, the positioning unit, the fixing unit and the two-way telescopic unit are all fitted together and the first electric clamp 2 and the second electric clamp 6 do not clamp the lower chord rod 1, so under the action of gravity, the three will gradually tend to a horizontal state; then the vertical telescopic cylinder 14 is started to pull the two-way telescopic unit upward again until it is reset, and the first electric clamp 2 and the second electric clamp 6 will also be reset. After resetting, let the two clamp the lower chord rod 1, and the entire positioning device can be firmly fixed at the bottom of the new lower chord rod 1; Continue crawling, the first electric clamping jaw 2 is released, the electromagnet 16 is turned off, and when the four telescopic cylinders are extended, the first electric clamping jaw 2 is clamped again and the electromagnet 16 is energized again to complete crawling.
[0020] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the present invention.
Claims
1. A lower chord positioning device for a steel beam bridge, characterized in that: It includes a fixed unit, a bidirectional telescopic unit and a positioning unit, wherein the fixed unit and the positioning unit are respectively arranged on both sides of the bidirectional telescopic unit; the fixed unit includes a first electric clamp and a laser reflection point, wherein the first electric clamp includes two first claw bodies, and the laser reflection point is arranged on the first claw body and faces the positioning unit; the positioning unit includes a second electric clamp and a laser detector, wherein the second electric clamp includes two second claw bodies, and the laser detector is arranged on the second claw body and opposite to the laser reflection point; the bidirectional telescopic unit can drive the positioning unit and the fixed unit to move back and forth.
2. The lower chord positioning device for a steel beam bridge according to claim 1, characterized in that: A through groove body is horizontally arranged on the second claw body, a return spring is arranged in the through groove body, a compression block is arranged on the return spring, and the compression block can move into the through groove body when subjected to external force, the laser detector is arranged at the side end of the compression block and when the compression block moves to the bottom, the laser detector and the laser reflection point are located in the same horizontal plane.
3. The lower chord positioning device for a steel beam bridge according to claim 2, characterized in that: Extension frames are arranged on the sides of the two first claws, and laser reflection points are also arranged on the extension frames; the second claw can move horizontally under the drive of the second electric cylinder so that the laser detector can be aligned with the laser reflection point on the first claw or the extension frame.
4. The lower chord positioning device for a steel beam bridge according to claim 3 is characterized in that: The bidirectional telescopic unit comprises a mounting base and four electric telescopic cylinders, wherein two electric telescopic cylinders are fixedly arranged on the mounting base as a group, and the telescopic directions of the two groups of electric cylinders are opposite; an electromagnet is arranged on one side of the mounting base facing the lower chord rod.
5. A positioning method for a lower chord positioning device of a steel beam bridge, characterized in that: The following steps are involved: S1, installation, installing the positioning device on the lower chord rod, the first electric clamp of the fixing unit and the second electric clamp of the positioning unit are clamped at the bottom of the lower chord rod, and the electromagnet of the mounting base is started and attracted to the bottom of the lower chord rod; S2, crawling. During crawling, the first electric clamp of the fixed unit is released, and then the two electric telescopic cylinders of the two-way telescopic unit drive the fixed unit to retract, and then the first electric clamp is clamped again; the electromagnet is disconnected, the four electric telescopic cylinders of the two-way telescopic unit are started at the same time, and the two electric telescopic cylinders close to the fixed unit are extended, and the other two electric telescopic cylinders are retracted. After the two-way telescopic unit moves into place, the electromagnet is opened again; the second electric clamp is released, and the electric telescopic cylinder connected to it is extended and drives the positioning unit to move forward, thereby completing one crawling of the positioning device; when the positioning device crawls into place, the positioning unit is in the preset position; S3, ready for installation, the second electric clamp is in a released state; S4, hoisting, hoist the new lower chord to the specified position. When the lower end of the lower chord moves to the second electric clamp, it will touch the compression block. At this time, the vertical position of the lower chord can be determined. Then start the second electric clamp. The second electric clamp can clamp the lower chord and push the lower chord to the center of the second electric clamp to complete the horizontal position positioning. S5, welding, after positioning is completed, the lower chord is welded.