Temporary fixing device for front support lower cross beam of upper guide type bridge girder erection machine

Abstract

The utility model discloses a temporary fixing device for a front support lower cross beam of an upper guide type bridge girder erection machine, which is used for solving the technical problem of temporary fixing of the front support lower cross beam of the upper guide type bridge girder erection machine and belongs to the technical field of bridge girder erection machines. The device comprises a trapezoidal positive and negative lead screw, one half of the trapezoidal positive and negative lead screw is a positive thread part, the other half of the trapezoidal positive and negative lead screw is a negative thread part, nuts are arranged on the two sides of the trapezoidal positive and negative lead screw, round pipes are fixed to the opposite sides of the two nuts respectively, and the round pipes can sleeve the lead screw part of the trapezoidal positive and negative lead screw. The other end of the round pipe is rotationally connected with angle steel, and round holes are formed in the two faces, perpendicular to each other, of the angle steel.

Description

Technical Field

[0001] This utility model belongs to the field of bridge erecting machine technology, and specifically relates to a temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine. Background Technology

[0002] With the continuous advancement of technology and the constant changes in engineering requirements, the design and function of bridge erecting machines are also constantly being upgraded and improved. In the construction of long-span bridges, the top-guided bridge erecting machine is widely used due to its powerful lifting capacity and precise operation performance.

[0003] During construction, when the top-guided bridge erecting machine is erecting the last span of the bridge girder, the support position of the front outrigger needs to be raised from the original cap beam to the bridge abutment, with a lifting height of approximately 1.5 meters. To ensure an effective lifting distance, the front outrigger column and its connection need to be replaced from the original 1.4-meter standard section to a 0.4-meter adjusting section. During this replacement process, after the 1.4-meter standard section is removed, the track beam, traveling mechanism, and lower crossbeam of the front outrigger are temporarily detached from the main body of the bridge erecting machine and remain alone on the last span cap beam, posing a risk of falling. Therefore, it is necessary to temporarily secure the detached parts to the bridge erecting machine before removing the 1.4-meter standard section.

[0004] In existing technologies, a common practice is to weld the section to be detached to the outriggers of the bridge erecting machine using steel pipes, forming a single unit. The steel pipes are then removed by hot cutting after the 0.4m adjusting section is replaced. However, frequent welding and hot cutting of the bridge erecting machine's structure can cause microstructural changes in the steel near the weld, expanding the heat-affected zone and affecting the overall mechanical properties of the machine's steel structure. During welding, due to the large temperature gradient across the component cross-section and localized plastic compression, the weld and its adjacent base material will generate high residual tensile stresses after cooling, accompanied by some residual deformation. These residual stresses and deformations may affect the stable load-bearing capacity of the steel structure, and even lead to structural deformation or cracking. Furthermore, the reaction of oxygen with the metal during welding and hot cutting can damage the paint layer on the steel structure surface, making the bridge erecting machine more susceptible to corrosion and oxidation during subsequent use, thus shortening its service life. Utility Model Content

[0005] The purpose of this utility model is to provide a temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine. This device has the advantages of compact structure, convenient and quick installation and disassembly, high flexibility and mobility, and does not damage the structure of the bridge erecting machine.

[0006] This utility model is achieved using the following technical solution:

[0007] A temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine includes a trapezoidal positive and negative lead screw. Half of the trapezoidal positive and negative lead screw is a positive lead part and the other half is a negative lead part. Nuts are provided on both sides of the trapezoidal positive and negative lead screw. A round tube is fixed on each of the opposite sides of the two nuts. The round tube can fit the lead screw part of the trapezoidal positive and negative lead screw. An angle steel is rotatably connected to the other end of the round tube. A round hole is provided on each of the two mutually perpendicular surfaces of the angle steel.

[0008] In application, one of the two round holes on the angle steel is used to lock the rotation angle of the angle steel, and the other round hole is used to install and fix the device. First, manually tighten the nuts on both sides of the device to the appropriate position. After the angle steel at the end of the round tube reaches the appropriate position, fix the device to the crossbeam and the rest of the bridge erecting machine through the fixing round hole on the angle steel. Then, by rotating the trapezoidal positive and negative screws, drive the nuts on both sides to move in opposite directions until the device is tightened.

[0009] More preferably, a rotating handle is fixedly provided in the middle of the trapezoidal positive and negative lead screws to facilitate the rotation of the trapezoidal positive and negative lead screws.

[0010] More preferably, the length of the circular tube on one side of the positive thread portion of the trapezoidal positive and negative leadscrews is equal to the length of the positive thread portion of the trapezoidal positive and negative leadscrews, and the length of the circular tube on one side of the negative thread portion of the trapezoidal positive and negative leadscrews is equal to the length of the negative thread portion of the trapezoidal positive and negative leadscrews, so as to maximize the adaptability of the device to different lengths.

[0011] A further preferred embodiment includes a fixing bolt, wherein a steel plate is fixed to the round tube, and a round hole is provided on the steel plate. The fixing bolt passes through the round hole to connect the steel plate and the angle iron together. When the fixing bolt is tightened, the angle between the steel plate and the angle iron is locked.

[0012] More preferably, the circular tube is a steel tube.

[0013] A further preferred option is that the length of the circular tube is 1.5m.

[0014] The main function of this invention is to temporarily secure the front outriggers detached from the main body of the bridge erecting machine, preventing the detached portion from falling off the cap beam. Simultaneously, the device must avoid damaging the mechanical properties and corrosion resistance of the main structure of the bridge erecting machine.

[0015] This invention offers high flexibility and mobility during bridge erection, is unaffected by environmental factors such as power supply and weather conditions, and is suitable for high-altitude bridge erection machine operations. During use, the active rotating handle allows for the extension and retraction of a temporary fixing device for the lower crossbeam of the upper guide type bridge erection machine within a 3-meter range. The length can be adjusted according to the actual distance, resulting in relatively fast construction speed and simple operation, thus shortening the construction cycle.

[0016] Compared with traditional electric welding and hot cutting, this invention will not damage the stable load-bearing capacity of the steel structure of the bridge erecting machine, nor will it affect the corrosion resistance of the steel structure. The operation of this invention only requires an ordinary worker to rotate the middle handle, eliminating the need for a welder to perform hot work. The use of threaded connection can significantly shorten the operation time and improve operational safety, while reducing pollution and damage to the surrounding environment. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0020] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0021] In the diagram: 11-positive thread section, 12-negative thread section, 2-nut, 3-round tube, 4-angle steel, 41-fixing bolt one, 42-steel plate, 5-rotating handle. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0023] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0025] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] A temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine includes a trapezoidal positive and negative lead screw. Half of the trapezoidal positive and negative lead screw is a positive lead part 11, and the other half is a negative lead part 12. Nuts 2 are provided on both sides of the trapezoidal positive and negative lead screw. A round tube 3 is fixed on each of the opposite sides of the two nuts 2. The round tube 3 can fit the lead screw part of the trapezoidal positive and negative lead screw. An angle steel 4 is rotatably connected to the other end of the round tube 3. The two mutually perpendicular surfaces of the angle steel 4 are provided with round holes. In this embodiment, the round tube 3 is a steel pipe. The positive lead part and the negative lead part 12 of the trapezoidal positive and negative lead screw are both 1.5m.

[0027] A rotating handle 5 is fixedly installed in the middle of the trapezoidal positive and negative lead screw. The rotating handle 5 can be directly welded to the middle of the trapezoidal positive and negative lead screw. To increase comfort, a mounting platform can also be fixedly connected in the middle of the trapezoidal positive and negative lead screw, and the rotating handle 5 can be detachably connected to the mounting platform for easy replacement of the rotating handle 5.

[0028] The length of the round tube 3 on one side of the positive thread portion 11 of the trapezoidal positive and negative leadscrews is equal to the length of the positive thread portion 11 of the trapezoidal positive and negative leadscrews, and the length of the round tube 3 on one side of the negative thread portion 12 of the trapezoidal positive and negative leadscrews is equal to the length of the negative thread portion 12 of the trapezoidal positive and negative leadscrews.

[0029] It also includes a fixing bolt 41, a steel plate 42 fixed to the round tube 3, a round hole on the steel plate 42, the fixing bolt 41 passes through the round hole to connect the steel plate 42 and the angle iron together, and when the fixing bolt 41 is tightened, the angle between the steel plate 42 and the angle iron is locked.

[0030] In this embodiment, angle steel 4 is connected to the bridge erecting machine on one side by fixing bolt 2, and angle steel 4 is connected to the crossbeam on the other side by fixing bolt 2.

[0031] The working principle is as follows;

[0032] The nuts 2 on both sides of the trapezoidal positive and negative screw are fixed to the head of the steel pipe. When the rotating handle 5 in the middle is rotated, the trapezoidal positive and negative screw rotates. The positive screw part 11 and the negative screw part 12 will generate forces to the left and right respectively on their respective nuts 2. The trapezoidal positive and negative screw, through cooperation with the nuts 2, converts the rotational motion into linear motion, thereby realizing the extension and retraction of the steel pipes on both sides within a range of 3m.

[0033] Angle steel 4, which is fixed at the end of the steel pipe, is used to install fixing bolt 2. Fixing bolt 2 passes through angle steel 4 to fix the round hole of this device and the corresponding round hole of the bridge erecting machine to fix angle steel 4.

[0034] During implementation, when the top-guided bridge erecting machine is erecting the last span of the bridge beam, first adjust the extension length of the circular tube 3 of this device according to the actual distance between the lower crossbeam of the front support leg and the middle crossbeam of the middle support leg of the bridge erecting machine. Then fix the two fixing bolts at both ends of this device to the bridge erecting machine body (one end is fixed to one side of the middle crossbeam of the middle support leg, and the other end is fixed to one side of the lower crossbeam of the front support leg). Turn the rotating handle 5 appropriately in the opposite direction to tighten it, so that the lower crossbeam of the front support leg and the bridge erecting machine body (specifically the middle crossbeam of the middle support leg) are connected as a whole. Then replace the 1.4m standard section of the front support column with a 0.4m adjusting section. After the replacement is completed, finally loosen this device and remove the two fixing bolts at both ends.

[0035] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and all should be covered by the protection scope of the claims.

Claims

1. A temporary fixing device for the lower crossbeam of the front support of an upper-guided bridge erecting machine, characterized in that: The device includes a trapezoidal positive and negative lead screw, half of which is a positive lead part (11) and the other half is a negative lead part (12). Nuts (2) are provided on both sides of the trapezoidal positive and negative lead screw. A round tube (3) is fixed on each of the opposite sides of the two nuts (2). The round tube (3) can fit the lead screw part of the trapezoidal positive and negative lead screw. An angle steel (4) is rotatably connected to the other end of the round tube (3). The angle steel (4) has round holes on its two mutually perpendicular surfaces.

2. The temporary fixing device for the lower crossbeam of the front support of the upper guide type bridge erecting machine according to claim 1, characterized in that: A rotating handle (5) is fixedly installed in the middle of the trapezoidal positive and negative lead screws.

3. The temporary fixing device for the lower crossbeam of the front support of the upper guide type bridge erecting machine according to claim 1, characterized in that: The length of the round tube (3) on one side of the positive thread portion (11) of the trapezoidal positive and negative thread rod is equal to the length of the positive thread portion (11) of the trapezoidal positive and negative thread rod, and the length of the round tube (3) on one side of the negative thread portion (12) of the trapezoidal positive and negative thread rod is equal to the length of the negative thread portion (12) of the trapezoidal positive and negative thread rod.

4. A temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine according to any one of claims 1-3, characterized in that: It also includes a fixing bolt (41), the round tube (3) is fixed with a steel plate (42), the steel plate (42) is provided with a round hole, the fixing bolt (41) passes through the round hole to connect the steel plate (42) and the angle iron together, and when the fixing bolt (41) is tightened, the angle between the steel plate (42) and the angle iron is locked.

5. A temporary fixing device for the lower crossbeam of the front support of an upper guide type bridge erecting machine according to any one of claims 1-3, characterized in that: The circular tube (3) is a steel pipe.

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