Height-adjustable temporary support leg for bridge girder erection and adjusting method

Abstract

This invention discloses a height-adjustable temporary outrigger for bridge erecting machine construction and its adjustment method, relating to the field of bridge erecting machine construction technology. It includes a lower support leg and an upper crossbar slidably installed inside the lower support leg. An upper support rod is fixedly installed at the upper end of the upper crossbar, and a support platform is fixedly installed at the upper end of the upper support rod. This height-adjustable temporary outrigger for bridge erecting machine construction allows for flexible adjustment of the support height, adapting to the support needs of different construction scenarios. It eliminates the need for additional padding blocks for height adjustment, reducing the workload of construction preparation. Simultaneously, it enhances the overall structural stability during support. The interlocking and sliding design of the upper crossbar and lower support leg allows for quick fixation of the position after height adjustment via a locking mechanism. Balance detection is also possible during support. The operation process is simple and convenient, facilitating rapid adjustment by construction personnel and effectively improving the efficiency and safety of temporary support operations during bridge erecting machine construction.

Description

Technical Field

[0001] This invention relates to the field of bridge erecting machine construction technology, specifically to a height-adjustable temporary support leg for bridge erecting machine construction and its adjustment method. Background Technology

[0002] During bridge construction, bridge erecting machines require supporting structures to ensure stability during the bridge erection process. Depending on the actual situation, the support status of the bridge erecting machine needs to be adjusted. In such cases, temporary outriggers may be needed as direct load-bearing structures. Generally, temporary outriggers with adjustable height are selected, and their height adjustment capability directly affects the adaptability to construction.

[0003] Patent CN220598177U discloses a temporary outrigger for a bridge erecting machine. By cooperating with a width adjustment structure and clamping protrusions, the distance between two support frames can be adjusted, thereby changing the overall width of the outrigger. This makes it easier to install the support frames on the main beam of the bridge erecting machine, and further facilitates the position adjustment of the support frames on the main beam. This allows for quick positioning and installation of the temporary outrigger on the main beam, meeting the needs of rapid operation. At the same time, by setting auxiliary support components, this temporary outrigger for a bridge erecting machine can effectively increase the contact area between the support frame and the bridge deck, increasing the stability of the support frame and thus ensuring greater stability when the bridge erecting machine is hoisting and moving the bridge beams.

[0004] Patent CN115928597B discloses a flexible leg anchoring device for a bridge erecting machine, a flexible leg for a bridge erecting machine, and a bridge erecting machine. The support base is used to connect with the lower column, and the distance between one end of the two adjustable telescopic devices connected to the upper connecting seat is less than the distance between the other ends of the two adjustable telescopic devices. Even when anchoring is not possible, it can still provide stable support for the flexible leg body; no anchoring holes are required, resulting in higher construction efficiency.

[0005] Patent CN212200080U discloses a bridge erecting machine leg and a walking bridge erecting machine. The leg's internal components and outer sleeve are provided with several through holes for pins to pass through. A missing pin protection device includes a bracket, a status indicator, and several proximity switches. The bracket is connected to the outer sleeve, and the proximity switches are mounted on the bracket, with their positions corresponding to the through holes on the outer sleeve. The status indicator has an indicator light to display the status of the proximity switches. The walking bridge erecting machine includes a bridge erecting machine. When a pin is not installed correctly or is not installed, the indicator light is red; when the pin is installed correctly, it is green. The indicator light provides feedback on the pin installation status, effectively solving the problem of missing or improperly installed pins and preventing safety accidents.

[0006] In the aforementioned patent, the outriggers of the bridge erecting machine can ensure higher construction efficiency. However, in actual use, the outriggers of the bridge erecting machine still have the following problems: The outriggers are positioned and fixed by multiple sets of pins after adjustment. During the adjustment process, the pins need to be repeatedly disassembled and reassembled, which is cumbersome. The height adjustment interval is also limited by the distribution of pin holes, making it impossible to achieve precise height fine-tuning. At the same time, when adjusting the support height of the outriggers, the weight of the overall structure mostly requires large motors or lifting equipment to lift the support part, which is laborious and increases the workload of the operators. In addition, when the support is under stress, the support status cannot be detected intuitively and quickly. When the support area is unevenly stressed or the outriggers are not fully and effectively bearing the load, no warning can be issued in time, which can easily lead to safety hazards of support instability.

[0007] To address the aforementioned issues, there is an urgent need for innovative design based on the existing temporary support leg structure. Summary of the Invention

[0008] The purpose of this invention is to provide a height-adjustable temporary outrigger for bridge erection machine construction and an adjustment method, in order to solve the problems mentioned in the background art, such as cumbersome pin positioning and disassembly, poor gear adjustment accuracy, the need for large equipment to lift and pull, the lack of force monitoring and early warning, uneven force distribution leading to instability and safety hazards.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A height-adjustable temporary support leg for bridge erecting machine construction and its adjustment method include a lower support leg and an upper crossbar slidably installed inside the lower support leg. An upper support rod is fixedly installed at the upper end of the upper crossbar, and a support platform is fixedly installed at the upper end of the upper support rod. The lower end of the support platform is provided with a positioning structure and a warning structure. The positioning structure can ensure high-strength support of the support platform, and the warning structure can detect the support status of the support platform. The lower support leg is provided with a force-saving structure, which can reduce the force required for the support platform to support.

[0011] Preferably, the positioning structure includes a lower horizontal plate, which is slidably mounted on the lower end of the lower support leg, and a lower support rod is fixedly installed between the lower horizontal plate and the support platform.

[0012] Preferably, a hydraulic rod A is fixedly installed at the upper end of the lower horizontal plate, and a lifting plate is fixedly installed at the upper end of the hydraulic rod A. A rotating rod is rotatably installed at the upper end of the lifting plate, and a vertical rod is rotatably installed at the end of the rotating rod away from the lifting plate.

[0013] Preferably, positioning plates are fixedly installed at both the upper and lower ends of the vertical rod, and the positioning plates are slidably installed inside the upper horizontal rod and the lower horizontal plate, respectively, and the positioning plates are engaged with the positioning grooves opened at the front and rear ends of the lower support leg.

[0014] Preferably, a fixing plate is fixedly installed at the upper end of the lower horizontal plate, and a limit rod is fixedly installed at the upper end of the fixing plate, and the limit rod is slidably connected to two sets of vertical rods.

[0015] Preferably, the labor-saving structure includes a hydraulic rod B, which is fixedly installed inside the lower end of the lower support leg. An installation plate is fixedly installed on the upper end of the hydraulic rod B, and a winding wheel is rotatably installed on the upper end of the installation plate. A wire rope is provided on the outer side of the winding wheel, and the two ends of the wire rope are fixedly connected to the lower end of the lower support leg and the upper end of the lower cross plate, respectively.

[0016] Preferably, a sliding plate is slidably installed at the lower end of the mounting plate, and the sliding plate is engaged with a sliding groove opened inside the lower support leg, and the distance between the upper and lower sliding grooves is half the distance between the upper and lower positioning grooves.

[0017] Preferably, the force-saving structure further includes a guide rod, which is fixedly installed between two sets of lower support rods. Two sets of sliding square tubes are slidably installed on the outer side of the guide rod, and a return spring sleeved on the outer side of the guide rod is located between the two sets of sliding square tubes. A traction rope is provided between the sliding square tube and the vertical rod, and the traction rope is located outside the guide wheel rotatably installed at the upper end of the fixed plate.

[0018] Preferably, the warning structure includes a weighted rod, which is rotatably mounted on the lower end of the support platform. Two sets of connecting rods are rotatably mounted on the outer side of the weighted rod, and an adjusting rod rotatably mounted on the end of the connecting rod away from the weighted rod is slidably connected to the support platform.

[0019] Preferably, the display panel fixedly installed at the lower end of the adjusting rod is located on the outside of the lower support leg, and an electronic rangefinder is provided at the end of the lower support leg near the display panel. The two sets of alarms provided at the lower end of the support platform are electrically connected to the two sets of electronic rangefinders respectively.

[0020] This solution also provides a method for adjusting the height-adjustable temporary outriggers used in bridge erection machines. The adjustment method includes:

[0021] S1. The hydraulic rod B pushes the mounting plate and winding wheel upward, which can directly drive the lower horizontal plate to move upward, adjust the support position of the support platform, and after the height is adjusted, the support platform can be supported by engaging with the support leg through the positioning plate, ensuring the support stability of the support platform while reducing the force required for the hydraulic rod B to work.

[0022] S2. During the positioning support process, the mounting plate can be supported again by the sliding plate engaging with the support leg, which further ensures the stability of the support platform. At the same time, it can separate the sliding plate and positioning plate from the support leg and quickly complete the positioning of the support leg.

[0023] S3. The two sets of display panels can intuitively display the support status of the support platform on the horizontal plane. At the same time, the two sets of electronic distance measuring instruments set at the lower end of the support platform can automatically determine the horizontal status of the support platform through the vertical weighted rods, thereby improving the safety of the support leg.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This height-adjustable temporary outrigger uses a positioning plate that can move synchronously in the positioning structure to quickly lock the adjusted upper crossbar and lower support leg together. After the positioning plate is inserted into the positioning groove of the lower support leg, it can provide multiple lateral and longitudinal positioning for the upper crossbar during the support process, avoiding the loosening of the single sliding adjustment structure due to excessive force, and effectively improving the overall support stability and structural strength of the outrigger.

[0026] 2. By designing a labor-saving structure, the upper crossbar can be raised and its height adjusted by winding the steel wire rope through the winding wheel, which provides upward traction to the lower crossbar, support platform, and upper crossbar as a whole. This, combined with the lifting action of hydraulic rod B, helps to share the weight of the overall support structure, reducing the thrust required by the power structure during height adjustment and making the height adjustment process smoother and more labor-saving.

[0027] 3. The system can monitor the tilt status of the support platform in real time through the warning structure. When the support platform tilts or shifts due to uneven force or loose support, the weighted rod will always remain vertically hanging down, which will cause the adjustment rods on both sides to move asynchronously. At this time, when the electronic distance measuring instrument detects that the position deviation of the display plate exceeds the preset range, it will immediately trigger the alarm on the corresponding side to issue a warning, reminding the construction personnel to adjust the support status in time to avoid safety accidents caused by support failure.

[0028] 4. Furthermore, during the movement of the vertical rod, the traction rope will pull the sliding square tubes closer to each other along the guide rod, compressing the return spring and making the movement of the vertical rod more stable and smooth. At the same time, when the positioning plate is disengaged from the positioning groove, the elastic return force of the return spring can assist the vertical rod to quickly return to its original position, improving the response efficiency of the height adjustment process.

[0029] 5. Furthermore, as the winding wheel moves upward with the mounting plate, it can keep the wire rope taut at all times. While using the lifting force of the hydraulic rod B to share the weight of the support structure, it will not hinder the normal height adjustment of the support structure. The engagement and positioning of the sliding plate and the sliding groove can also ensure the stability of the mounting plate during movement and prevent the winding wheel from shifting or jamming due to uneven force. Attached Figure Description

[0030] Figure 1 This is a top-view three-dimensional structural diagram of the present invention;

[0031] Figure 2 This is a top-view three-dimensional structural diagram of the upper support rod of the present invention;

[0032] Figure 3 This is a top-view three-dimensional structural diagram of the support platform of the present invention;

[0033] Figure 4 This is a top-view three-dimensional structural diagram of the steel wire rope of the present invention;

[0034] Figure 5 This is a top-view three-dimensional structural diagram of the upper crossbar of the present invention;

[0035] Figure 6 This is a top-view three-dimensional structural diagram of the positioning plate of the present invention;

[0036] Figure 7 This is a top-view three-dimensional structural diagram of the sliding plate of the present invention;

[0037] Figure 8 This is a top-view three-dimensional structural diagram of the fixing plate of the present invention;

[0038] Figure 9 This is a top-view three-dimensional structural diagram of the vertical rod of the present invention;

[0039] Figure 10 This is a top-view three-dimensional structural diagram of the guide rod of the present invention;

[0040] Figure 11 This is a three-dimensional structural diagram of the support platform of the present invention viewed from below;

[0041] Figure 12 This is a three-dimensional structural diagram of the connecting rod of the present invention viewed from below.

[0042] In the diagram: 1. Lower support leg; 2. Upper crossbar; 3. Upper support rod; 4. Support platform; 5. Lower cross plate; 6. Lower support rod; 7. Hydraulic rod A; 8. Lifting plate; 9. Rotating rod; 10. Vertical rod; 11. Positioning plate; 12. Fixing plate; 13. Limiting rod; 14. Hydraulic rod B; 15. Mounting plate; 16. Winding wheel; 17. Wire rope; 18. Sliding plate; 19. Positioning groove; 20. Sliding groove; 21. Sliding square tube; 22. Guide rod; 23. Return spring; 24. Guide wheel; 25. Traction rope; 26. Weighting rod; 27. Connecting rod; 28. Adjusting rod; 29. ​​Display panel; 30. Electronic rangefinder; 31. Alarm. Detailed Implementation

[0043] 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.

[0044] Example 1: As Figures 1-3 As shown, the present invention provides the following technical solution: a height-adjustable temporary support leg for bridge erecting machine construction, including a lower support leg 1 and an upper crossbar 2 slidably installed inside the lower support leg 1, and an upper support rod 3 is fixedly installed at the upper end of the upper crossbar 2, and a support platform 4 is fixedly installed at the upper end of the upper support rod 3.

[0045] The lower end of the support platform 4 is equipped with a positioning structure and a warning structure. The positioning structure can ensure the high strength support of the support platform 4, and the warning structure can detect the support status of the support platform 4. The lower support leg 1 is equipped with a force-saving structure, which can reduce the force required for the support platform 4 to support.

[0046] When using the height-adjustable temporary outrigger for bridge erection machine construction, the outrigger needs to be placed on the upper end of the bridge and the support platform 4 needs to be raised and lowered to the required height. Then the support platform 4 can be used to support the bridge erection machine. When the upper crossbar 2 moves inside the lower support leg 1, it will support the support platform 4 through the upper support bar 3.

[0047] like Figures 2-3 As shown, the positioning structure includes a lower horizontal plate 5, which is slidably installed at the lower end of the lower support leg 1, and a lower support rod 6 is fixedly installed between the lower horizontal plate 5 and the support platform 4.

[0048] During the height adjustment of the support platform 4, the lower horizontal plate 5 needs to slide inside the lower support leg 1, and the support platform 4 is supported by the lower support rod 6 at the upper end of the lower horizontal plate 5.

[0049] like Figures 2-4 As shown, a hydraulic rod A7 is fixedly installed on the upper end of the lower horizontal plate 5, and a lifting plate 8 is fixedly installed on the upper end of the hydraulic rod A7. A rotating rod 9 is rotatably installed on the upper end of the lifting plate 8, and a vertical rod 10 is rotatably installed on the end of the rotating rod 9 away from the lifting plate 8.

[0050] The hydraulic rod A7 will move up and down synchronously with the lower horizontal plate 5. During the extension and retraction of the hydraulic rod A7, it will directly drive the lifting plate 8 to move up and down. At the same time, the lifting plate 8 will drive the vertical rod 10 to move synchronously through the rotating rod 9.

[0051] like Figure 1 and Figures 5-6As shown, positioning plates 11 are fixedly installed at both the upper and lower ends of the vertical rod 10, and the positioning plates 11 are slidably installed inside the upper horizontal rod 2 and the lower horizontal plate 5, respectively, and the positioning plates 11 are engaged with the positioning grooves 19 opened at the front and rear ends of the lower support leg 1.

[0052] During the movement of the vertical rod 10, the positioning plate 11 will move back and forth, thereby realizing the docking and separation of the positioning plate 11 and the positioning groove 19, so that the positioning plate 11 supports the lower horizontal plate 5 and the upper horizontal rod 2, providing conditions for the stable support of the support platform 4.

[0053] like Figure 1 and Figures 4-6 As shown, a fixing plate 12 is fixedly installed on the upper end of the lower horizontal plate 5, and a limiting rod 13 is fixedly installed on the upper end of the fixing plate 12, and the limiting rod 13 is slidably connected to two sets of vertical rods 10.

[0054] The limiting rod 13 can limit the forward and backward movement of the vertical rod 10, ensuring the stability of the vertical rod 10 driving the positioning plate 11.

[0055] like Figure 3 and Figure 7 As shown, the labor-saving structure includes a hydraulic rod B14, which is fixedly installed inside the lower end of the lower support leg 1. An installation plate 15 is fixedly installed on the upper end of the hydraulic rod B14, and a winding wheel 16 is rotatably installed on the upper end of the installation plate 15. A wire rope 17 is provided on the outer side of the winding wheel 16, and the two ends of the wire rope 17 are fixedly connected to the lower end of the lower support leg 1 and the upper end of the lower cross plate 5, respectively.

[0056] During the extension and retraction of the hydraulic rod B14, it directly drives the take-up wheel 16 to move up and down through the mounting plate 15. According to the pulley principle, the steel wire rope 17 set on the outside of the take-up wheel 16 will drive the lower horizontal plate 5 to move up and down. The distance that the lower horizontal plate 5 moves up and down is twice the distance that the mounting plate 15 moves up and down. At the same time, the force of the steel wire rope 17 pulling the lower horizontal plate 5 is almost half of the pressure on the support platform 4. In addition, the steel wire rope 17 is equipped with multiple sets to ensure the stability of the traction and reduce the stress on the hydraulic rod B14.

[0057] like Figures 7-8 As shown, the force-saving structure also includes a guide rod 22, which is fixedly installed between two sets of lower support rods 6. Two sets of sliding square tubes 21 are slidably installed on the outer side of the guide rod 22. The return spring 23 sleeved on the outer side of the guide rod 22 is located between the two sets of sliding square tubes 21. A traction rope 25 is provided between the sliding square tube 21 and the vertical rod 10. The traction rope 25 is located outside the guide wheel 24 rotatably installed on the upper end of the fixed plate 12.

[0058] As the two sets of vertical rods 10 move closer to each other, they will directly pull the sliding square tube 21 through the traction rope 25. At this time, the two sets of sliding square tubes 21 on the outside of the guide rod 22 will move closer to each other and cause the return spring 23 to contract. The guide rod 22 will balance and adjust the movement of the sliding square tube 21.

[0059] like Figures 8-10 As shown, a sliding plate 18 is slidably installed at the lower end of the mounting plate 15, and the sliding plate 18 is engaged with the sliding groove 20 opened inside the lower support leg 1. The distance between the upper and lower sliding grooves 20 is half the distance between the upper and lower positioning grooves 19.

[0060] The sliding square tube 21 will directly drive the sliding plate 18 inside it to move, so that the sliding plate 18 engages or disengages from the sliding groove 20, thereby achieving stable support for the mounting plate 15.

[0061] like Figures 11-12 As shown, the warning structure includes a weighted rod 26, which is rotatably mounted on the lower end of the support platform 4. Two sets of connecting rods 27 are rotatably mounted on the outer side of the weighted rod 26. Meanwhile, an adjustable rod 28, which is rotatably mounted on the end of the connecting rod 27 away from the weighted rod 26, is slidably connected to the support platform 4.

[0062] The weighted rod 26 will be in a vertical state under the action of gravity, and the support platform 4 will be in a horizontal support state, so that the connecting rods 27 and the adjusting rods 28 on the left and right sides can work in the same state.

[0063] like Figures 11-12 As shown, the display panel 29 fixedly installed at the lower end of the adjusting rod 28 is located on the outside of the lower support leg 1, and an electronic rangefinder 30 is provided at the end of the lower support leg 1 near the display panel 29. The two sets of alarms 31 provided at the lower end of the support platform 4 are electrically connected to the two sets of electronic rangefinders 30 respectively.

[0064] When the support platform 4 is in an inclined support state, the support states of the connecting rods 27 and the adjusting rods 28 on the left and right sides will be different. This will cause the display panel 29 to be at different distances from the outer side of the lower support leg 1, thus visually showing the support status of the outrigger and alerting the staff to take appropriate rescue measures. The display panel 29 can be set to red or have scales on its outer side to further enhance the warning effect. At the same time, the electronic rangefinder 30 can directly measure the positional change of the display panel 29 and convert this change into a signal to be transmitted to the alarm 31. The alarm 31 will then sound an alarm to remind relevant staff to investigate and ensure the stability of the outrigger support.

[0065] Example 2: A method for adjusting a height-adjustable temporary support leg used in bridge erection machine construction, the method comprising:

[0066] S1. The hydraulic rod B14 pushes the mounting plate 15 and the winding wheel 16 upward, which can directly drive the lower horizontal plate 5 upward, adjust the support position of the support platform 4, and after the height is adjusted, the support platform 4 can be supported by the positioning plate 11 engaging with the support leg 1, ensuring the support stability of the support platform 4 while reducing the force required for the hydraulic rod B14 to work.

[0067] S2. During the position support process, the support platform 4 can also engage with the support leg 1 through the sliding plate 18 to support the mounting plate 15 again, further ensuring the stability of the support platform 4. At the same time, it can separate the sliding plate 18 and the positioning plate 11 from the support leg 1 and quickly complete the positioning of the support leg 1.

[0068] S3. The two sets of display plates 29 can intuitively display the support status of the support platform 4 on the horizontal plane. At the same time, the two sets of electronic rangefinders 30 set at the lower end of the support platform 4 can automatically complete the judgment of the horizontal status of the support platform 4 through the vertical weighted rod 26, thereby improving the safety of the support leg 1.

[0069] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable temporary support leg for bridge erecting machine construction, comprising a lower support leg (1) and an upper crossbar (2) slidably installed inside the lower support leg (1), wherein an upper support rod (3) is fixedly installed at the upper end of the upper crossbar (2), and a support platform (4) is fixedly installed at the upper end of the upper support rod (3), characterized in that: The lower end of the support platform (4) is provided with a positioning structure and a warning structure. The positioning structure can ensure the high strength support of the support platform (4), and the warning structure can detect the support status of the support platform (4). The lower support leg (1) is provided with a force-saving structure, and the force-saving structure can reduce the force required for the support platform (4) to support.

2. The height-adjustable temporary support leg for bridge erecting machine construction according to claim 1, characterized in that: The positioning structure includes a lower horizontal plate (5), which is slidably installed at the lower end of the lower support leg (1), and a lower support rod (6) is fixedly installed between the lower horizontal plate (5) and the support platform (4).

3. The height-adjustable temporary support leg for bridge erecting machine construction according to claim 2, characterized in that: The upper end of the lower horizontal plate (5) is fixedly installed with a hydraulic rod A (7), and the upper end of the hydraulic rod A (7) is fixedly installed with a lifting plate (8). The upper end of the lifting plate (8) is rotatably installed with a rotating rod (9), and the end of the rotating rod (9) away from the lifting plate (8) is rotatably installed with a vertical rod (10).

4. The height-adjustable temporary support leg for bridge erecting machine construction according to claim 3, characterized in that: The vertical rod (10) is fixedly installed with positioning plates (11) at both the upper and lower ends. The positioning plates (11) are slidably installed inside the upper horizontal rod (2) and the lower horizontal plate (5), respectively. The positioning plates (11) are engaged with the positioning grooves (19) opened at the front and rear ends of the lower support leg (1).

5. The height-adjustable temporary support leg for bridge erecting machine construction according to claim 4, characterized in that: A fixing plate (12) is fixedly installed on the upper end of the lower horizontal plate (5), and a limiting rod (13) is fixedly installed on the upper end of the fixing plate (12), and the limiting rod (13) is slidably connected to two sets of vertical rods (10).

6. The height-adjustable temporary support leg for bridge erecting machine construction according to claim 5, characterized in that: The force-saving structure includes a hydraulic rod B (14), which is fixedly installed inside the lower end of the lower support leg (1). An installation plate (15) is fixedly installed on the upper end of the hydraulic rod B (14), and a winding wheel (16) is rotatably installed on the upper end of the installation plate (15). A wire rope (17) is provided on the outer side of the winding wheel (16), and the two ends of the wire rope (17) are fixedly connected to the lower end of the lower support leg (1) and the upper end of the lower cross plate (5), respectively.

7. A height-adjustable temporary support leg for bridge erecting machine construction according to claim 6, characterized in that: The lower end of the mounting plate (15) is slidably mounted with a sliding plate (18), and the sliding plate (18) is engaged with the sliding groove (20) opened inside the lower support leg (1), and the distance between the upper and lower sliding grooves (20) is half the distance between the upper and lower positioning grooves (19).

8. A height-adjustable temporary support leg for bridge erecting machine construction according to claim 7, characterized in that: The force-saving structure also includes a guide rod (22), which is fixedly installed between two sets of lower support rods (6). Two sets of sliding square tubes (21) are slidably installed on the outside of the guide rod (22). The return spring (23) sleeved on the outside of the guide rod (22) is located between the two sets of sliding square tubes (21). A traction rope (25) is provided between the sliding square tube (21) and the vertical rod (10). The traction rope (25) is located outside the guide wheel (24) rotatably installed on the upper end of the fixed plate (12).

9. A height-adjustable temporary support leg for bridge erecting machine construction according to claim 8, characterized in that: The warning structure includes a weighted rod (26), which is rotatably mounted on the lower end of the support platform (4). Two sets of connecting rods (27) are rotatably mounted on the outer side of the weighted rod (26). At the same time, an adjustable rod (28) rotatably mounted on the end of the connecting rod (27) away from the weighted rod (26) is slidably connected to the support platform (4). The display panel (29) fixedly mounted on the lower end of the adjustable rod (28) is located on the outer side of the lower support leg (1). An electronic rangefinder (30) is provided inside the lower support leg (1) near the display panel (29). Two sets of alarms (31) provided on the lower end of the support platform (4) are electrically connected to the two sets of electronic rangefinders (30).

10. A method for adjusting a height-adjustable temporary outrigger for bridge erecting machine construction, applicable to the height-adjustable temporary outrigger for bridge erecting machine construction as described in any one of claims 1-9, characterized in that, Adjustment methods include: S1. The hydraulic rod B (14) pushes the mounting plate (15) and the winding wheel (16) to move upward, which can directly drive the lower horizontal plate (5) to move upward, adjust the support position of the support platform (4), and the support platform (4) can be supported by engaging with the support leg (1) through the positioning plate (11) after the height adjustment, ensuring the support stability of the support platform (4) while reducing the force required for the hydraulic rod B (14) to work. S2. During the position support process, the support platform (4) can also engage with the support leg (1) through the sliding plate (18) to support the mounting plate (15) again, further ensuring the stability of the support platform (4). At the same time, it can separate the sliding plate (18) and the positioning plate (11) from the support leg (1) and quickly complete the positioning of the support leg (1). S3. The two sets of display plates (29) can intuitively display the support status of the support platform (4) on the horizontal plane. At the same time, the two sets of electronic rangefinders (30) set at the lower end of the support platform (4) can automatically complete the judgment of the horizontal status of the support platform (4) through the vertical weighted rod (26), thereby improving the safety of the support leg (1).

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