Diagonal bracing structure for front leg of bridge girder erection machine, and construction method

Abstract

A diagonal bracing structure for a front leg of a bridge girder erection machine and a construction method, which relate to the technical field of bridge construction. The diagonal bracing structure for a front leg of a bridge girder erection machine is located between a front leg (100) of a bridge girder erection machine and an erected box girder (200), is configured to fix and support the front leg (100) of the bridge girder erection machine on a beam head of the erected box girder (200), and comprises: a diagonal bracing rod (1), the upper end thereof being hinged to the front leg (100); and a fixing mechanism (2), which is arranged at the lower end of the diagonal bracing rod (1) and comprises: a first fixing member (21) arranged on the upper side of the beam head of the erected box girder (200) and hinged to the lower end of the diagonal bracing rod (1); and a second fixing member (22) arranged on the lower side of the front end of the first fixing member (21) and having the rear side abutting against the front side of the beam head of the erected box girder (200), the second fixing member (22) comprising: a protruding block (221) perpendicularly arranged on the rear side of the second fixing member (22) and located below a top wall (201) of the erected box girder (200); and a first screw rod (222) in self-locking threaded connection with the protruding block (221), the upper end of the first screw rod (222) passing through the protruding block (221) from bottom to top and being perpendicular to the top wall (201). The provided diagonal bracing structure for a front leg of a bridge girder erection machine improves the construction efficiency of the bridge girder erection machine and the reliability of the diagonal bracing mechanism for a front leg.

Description

Bridge erecting machine front outrigger diagonal brace structure and construction method Technical Field

[0001] This invention relates to the field of bridge construction technology. In particular, it relates to a front outrigger diagonal bracing structure and construction method for a bridge erecting machine. Background Technology

[0002] The girder erection operation of a walking-type bridge erecting machine involves prefabricating the box girders to be erected in segments at the girder fabrication yard. These segments are then transported by a girder transport vehicle to the rear end of the bridge erecting machine, which is already erected at the bridge span location. A crane on the bridge erecting machine then suspends the prefabricated girder segments one by one, arranging them systematically below the main girder of the bridge erecting machine, which is already aligned with the bridge span. Finally, each girder segment is lowered onto the bridge pier. In existing technology, one type of bridge erecting machine supports the main girder on active roller sets at the top of the front and middle outriggers. Starting the roller motor drives the main girder to move forward along the top surface of the roller sets to achieve longitudinal movement across the span. During the forward movement of the main girder along the top rollers of the front outriggers, the front outriggers must resist the horizontal recoil force of the rollers; otherwise, the machine will tip over.

[0003] Patent (Publication No.: CN103147397B) discloses a front outrigger diagonal bracing mechanism for a bridge erecting machine and its installation method. The diagonal bracing mechanism is located between the front outrigger of the bridge erecting machine and the erected concrete beam, and is used to fix and support the front outrigger of the bridge erecting machine on the erected concrete beam. It can solve the problem that walking-type highway or railway bridge erecting machines sometimes tip over due to the lack of a reasonable and reliable diagonal bracing mechanism for the front outrigger, which can lead to major accidents such as bridge erecting machine overturning. The mechanism uses a lifting chain, a spiral buckle connecting both ends of the lifting chain, and a binding chain consisting of the upper and lower corners of the concrete beam to fix the lower end of the diagonal bracing mechanism to the erected concrete beam. This method requires binding the concrete beam to be erected with chains before it is placed on the pier, which is a cumbersome process. After construction, removing the lifting chain is also troublesome. During the bridge erection process, the walking bridge erecting machine needs to move longitudinally across the span, repeatedly erecting concrete beams and installing front outriggers. The method of binding the concrete beam to be erected with chains to fix the diagonal bracing mechanism affects the construction efficiency. In addition, the binding method on the concrete beam to be erected has a weak limiting effect on horizontal forces. If the horizontal recoil force of the front outrigger roller is large, the lower end of the diagonal bracing rod may slip backward, causing the front outrigger to tilt and affecting the reliability of the diagonal bracing.

[0004] Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a front outrigger diagonal bracing structure and construction method for a bridge erecting machine, thereby improving the construction efficiency of the bridge erecting machine and the reliability of the front outrigger diagonal bracing mechanism.

[0006] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows:

[0007] A front outrigger bracing structure for a bridge erecting machine, located between the front outrigger of the bridge erecting machine and the already erected box girder, is used to fix and support the front outrigger of the bridge erecting machine to the head of the already erected box girder, including:

[0008] The diagonal brace has its upper end hinged to the front support leg.

[0009] A fixing mechanism, which is disposed at the lower end of the diagonal brace, includes:

[0010] The first fixing member is located on the upper side of the beam head of the erected box girder and is hinged to the lower end of the diagonal brace.

[0011] The second fastener is disposed on the lower side of the front end of the first fastener, and its rear side abuts against the front side of the already erected box girder head. The second fastener includes:

[0012] The protrusion is vertically disposed on the rear side of the second fixing member and located below the top wall of the erected box girder;

[0013] The first screw is self-lockingly threaded to the protrusion, and its upper end passes through the protrusion from bottom to top and is perpendicular to the top wall.

[0014] Furthermore, an elastic wear-resistant layer is provided at the upper end of the first screw.

[0015] Furthermore, a moving mechanism is provided in the middle of the first fixing member, the moving mechanism comprising:

[0016] A support rod is provided on each of the two side walls of the first fixing member. The middle part of the support rod is hinged to the upper end of the side wall of the first fixing member on the same side. A caster wheel is provided at the lower end of the support rod.

[0017] A sleeve is fixedly disposed on the upper side of the first fixing member and is rotatably connected to the first fixing member;

[0018] A forward and reverse rotating motor is mounted on the upper side of the first fixing member and is connected to the sleeve drive.

[0019] The fourth screw has two ends, one end of which is inserted into the sleeve and threadedly connected to the sleeve, and the other end is slidably connected to the support rod on the same side. The threads of the two fourth screws are opposite.

[0020] A U-shaped locking component is provided on each of the two side walls of the first fixing component. The opening of the U-shaped locking component faces outward. When the support rod is locked into the U-shaped locking component, the U-shaped locking component is used to limit the front and rear position of the support rod.

[0021] Furthermore, a first limit switch is provided at the bottom of the opening of the U-shaped locking component, and the first limit switch is electrically connected to the forward and reverse motor.

[0022] Furthermore, a second limit switch is provided on the front side of the second fixing member, and the second limit switch is electrically connected to the forward and reverse motor.

[0023] Furthermore, a fine-tuning mechanism is provided at the rear of the first fixing member, the fine-tuning mechanism comprising:

[0024] The first slide groove is arranged on the upper rear part of the first fixing member in the front-back direction, and is closed at both ends.

[0025] The slide block is slidably connected to the first slide groove and hinged to the lower end of the diagonal brace.

[0026] The second screw extends rearward from the rear end of the first slide groove. Its shaft is rotatably connected to both the front and rear ends of the first slide groove and is connected to the slide block via a self-locking thread.

[0027] Furthermore, windows are provided on both the left and right side walls of the first slide groove, and the slide block includes:

[0028] The second slide groove is arranged on the upper side of the slide block in the left-right direction, and its left and right ends are closed;

[0029] The hinged seat is slidably connected to the second slide groove in the left and right directions, and is hinged to the lower end of the diagonal brace.

[0030] The third screw has one end extending outward from the window at the same end, and its body is rotatably connected to both the left and right ends of the second slide groove, and is self-lockingly threaded to the hinge seat.

[0031] This invention also provides a construction method utilizing the diagonal bracing structure of the front outrigger of a bridge erecting machine, comprising the following steps:

[0032] Step 1: Before the front outrigger is installed on the pier, the upper end of the diagonal brace is pre-hinged and installed on the rear side of the column of the front outrigger.

[0033] Step 2: Use the overhead crane on the bridge erecting machine to hoist the fixing mechanism onto the head of the already erected box girder and position it behind the front support column. The first fixing member is located on the upper side of the head of the already erected box girder, and the rear side of the second fixing member abuts against the front side of the head of the already erected box girder.

[0034] Step 3: Rotate the first screw so that its upper end touches the lower side of the top wall;

[0035] Step 4: Connect the lower end of the hinge seat and the diagonal brace.

[0036] Furthermore, step 2 also includes:

[0037] Start the forward and reverse motor, so that the support rod is vertically locked in the U-shaped locking member. Move the fixing mechanism, first so that the fixing mechanism is located directly behind the front support column, and then so that the rear side of the second fixing member abuts against the front side of the already erected box girder head. Start the forward and reverse motor again, so that the support rod is disengaged from the U-shaped locking member from both sides, and the first fixing member sinks onto the upper side of the already erected box girder head.

[0038] Furthermore, prior to step 4, there are the following steps:

[0039] Based on the relative position of the lower end of the diagonal brace and the hinge seat, rotate the second screw and the third screw to adjust the position of the hinge seat to be aligned with the lower end of the diagonal brace.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The bridge erecting machine's front outrigger diagonal bracing structure provided by this invention has an upper end hinged to the front outrigger and a lower end hinged to a first fixing member. The first fixing member is located on the upper side of the erected box girder, and a second fixing member is located on the lower side of the front end of the first fixing member, with its rear side abutting against the front side of the erected box girder. When the main beam advances forward along the top roller of the front outrigger, and the front outrigger receives the horizontal recoil force of the roller, the horizontal recoil force is transmitted to the second fixing member through the diagonal bracing member and the first fixing member. The rear side of the second fixing member abuts against the front side of the erected box girder, and the erected box girder will generate a horizontal forward reaction force on the second fixing member. By balancing the horizontal recoil force of the diagonal bracing member and the roller, the front outrigger does not tilt. This structure avoids the problem of the lower end of the diagonal bracing member potentially slipping backward when the horizontal recoil force of the front outrigger roller is large, which is achieved by binding the box girder with chains to fix the lower end of the diagonal bracing member. This improves the reliability of the front outrigger diagonal bracing mechanism, simplifies installation and construction, and increases the construction efficiency of the bridge erecting machine. Attached Figure Description

[0042] Figure 1 is a schematic diagram of the inclined support structure of the front leg of the bridge erecting machine in a technical solution of the present invention.

[0043] Figure 2 is a schematic diagram of the structure in the M direction of Figure 1.

[0044] Figure 3 is a schematic diagram of the N-direction fixing mechanism in Figure 1.

[0045] Figure 4 is a magnified schematic diagram of part P in Figure 1.

[0046] Figure 5 is a schematic diagram of the moving mechanism.

[0047] Figure 6 is a schematic diagram of the AA section in Figure 5.

[0048] In the diagram, 100-front support leg, 200-box girder, 201-top wall, 1-diagonal brace, 2-fixing mechanism, 21-first fixing component, 211-first slide rail, 2111-window, 212-slide seat, 2121-second slide rail, 2122-hinged seat, 2123-third screw, 213-second screw, 214-support rod, 215-sleeve, 216-forward / reverse motor, 217-fourth screw, 218-U-shaped locking component, 2181-first limit switch, 22-second fixing component, 221-protrusion, 222-first screw, 2221-elastic wear-resistant layer, 223-second limit switch. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the technical solutions, so that those skilled in the art can implement it based on the description.

[0050] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0051] To explain in detail the technical content, objectives, and effects of this invention, the following description is provided in conjunction with the technical solution and accompanying drawings.

[0052] Example

[0053] As shown in Figures 1 and 2, a front outrigger diagonal bracing structure for a bridge erecting machine is located between the front outrigger 100 of the bridge erecting machine and the already erected box girder 200, for fixing and supporting the front outrigger 100 of the bridge erecting machine on the head of the already erected box girder 200, including:

[0054] The upper end of the diagonal brace 1 is hinged to the front support leg 100. A U-shaped ear plate is installed on the rear side of the front support leg 100 column by welding or other means as a hinge ear plate. A pin is inserted into the hinge hole at the upper end of the diagonal brace 1 and the hinge hole of the U-shaped ear plate to realize the hinge between the upper end of the diagonal brace 1 and the front support leg 100.

[0055] The fixing mechanism 2, which is disposed at the lower end of the diagonal brace 1, includes:

[0056] The first fixing member 21 is located on the upper side of the beam head of the erected box girder 200 and is hinged to the lower end of the diagonal brace 1;

[0057] The second fastener 22 is disposed on the lower front side of the first fastener 21, and its rear side abuts against the front side of the beam head of the erected box girder 200. The second fastener 22 includes:

[0058] The protrusion 221 is vertically disposed on the rear side of the second fixing member 22 and located below the top wall 201 of the erected box girder 200;

[0059] The first screw 222 is self-lockingly threaded to the protrusion 221, and its upper end passes through the protrusion 221 from bottom to top and is perpendicular to the top wall 201.

[0060] In use, rotate the first screw 222 so that the upper end of the first screw 222 abuts against the lower side of the top wall 201. The connection position between the fixing mechanism 2 and the erected box girder 200 can be fixed by the second fixing member 22.

[0061] The working principle of the front support leg diagonal brace in this invention is as follows:

[0062] The upper end of the diagonal brace 1 is hinged to the front support leg 100, and the lower end is hinged to the first fixing member 21. The first fixing member 21 is located on the upper side of the erected box girder 200, and the second fixing member 22 is located on the lower side of the front end of the first fixing member 21, with its rear side abutting against the front side of the erected box girder 200. When the main beam moves forward along the top roller of the front support leg 100, and the front support leg 100 receives the horizontal recoil force of the roller, the horizontal recoil force is transmitted to the second fixing member 22 through the diagonal brace 1 and the first fixing member 21. The rear side of the second fixing member 22 abuts against the front side of the already erected box girder 200. The already erected box girder 200 will generate a horizontal forward reaction force on the second fixing member 22. The horizontal recoil force of the diagonal brace 1 and the roller is balanced by the diagonal brace 1, so that the front support leg 100 does not tilt. This structure can avoid the problem that the lower end of the diagonal brace 1 may slip backward when the horizontal recoil force of the front support leg roller is large, by using chains to bind the box girder 200 to fix the lower end of the diagonal brace 1. This improves the reliability of the diagonal brace mechanism of the front support leg, and the installation and construction are relatively simple, thus improving the construction efficiency of the bridge erecting machine.

[0063] In another technical solution, as shown in Figure 4, an elastic wear-resistant layer 2221 is provided on the upper end of the first screw 222. For example, the elastic wear-resistant layer 2221 is made of rubber. Rubber has a certain elasticity. When the upper end of the first screw 222 abuts against the lower side of the top wall 201, the elastic wear-resistant layer allows the upper end of the first screw 222 to abut against the lower side of the top wall 201 more tightly, making the connection between the fixing mechanism 2 and the framed box beam 200 more secure, and protecting the upper end of the first screw 222 and the lower side of the top wall 201 from damage.

[0064] Normally, when the overhead crane lowers the fixing mechanism 2 onto the box girder 200, ensuring that the fixing mechanism 2 is positioned directly behind the front support leg 100 column and that the rear side of the second fixing member 22 abuts against the front side of the already erected box girder 200 requires coordinated efforts from both the overhead crane operators and the construction workers of the lower inclined support structure, which is very time-consuming. Furthermore, if the fixing mechanism 2 has already settled onto the already erected box girder 200, repositioning it is extremely difficult. In another technical solution, a moving mechanism is provided in the middle of the first fixing member 21, the moving mechanism comprising:

[0065] A support rod 214 is provided on each of the two side walls of the first fixing member 21. The middle part of the support rod 214 is hinged to the upper end of the side wall of the first fixing member 21 on the same side, and a caster wheel is provided at the lower end.

[0066] Sleeve 215 is fixedly disposed on the upper side of the first fixing member 21 and is rotatably connected to the first fixing member 21;

[0067] A forward and reverse motor 216 is mounted on the upper side of the first fixing member 21 and is connected to the sleeve 215 in a transmission manner.

[0068] The fourth screw 217 is provided in two parts. One end is inserted into the sleeve 215 and threadedly connected to the sleeve 215. The other end is slidably connected to the support rod 214 on the same side. The threads of the two fourth screws 217 are opposite.

[0069] A U-shaped locking component 218 is provided on each of the two side walls of the first fixing component 21. The opening of the U-shaped locking component 218 faces outward. When the support rod 214 is locked into the U-shaped locking component 218, the U-shaped locking component 218 is used to limit the front and rear position of the support rod 214.

[0070] As shown in Figure 5, when the forward and reverse motor 216 rotates forward, the drive sleeve 215 rotates accordingly, and the two fourth screws 217 extend to both sides, causing the lower end of the support rod 214 to swing downward. When the lower end of the support rod 214 is engaged with the U-shaped locking piece 218, the forward and reverse motor 216 stops working. At this time, the first fixing piece 21 is lifted away from the upper side of the erected box girder 200, and the fixing mechanism 2 can be moved. First, the fixing mechanism 2 is positioned directly behind the front support leg 100 column, and then the rear side of the second fixing piece 22 abuts against the front side of the beam head of the erected box girder 200. The forward and reverse motor 216 is restarted in reverse, allowing the support rod 214 to disengage from the U-shaped locking piece 218 from both sides, and the first fixing piece 21 sinks onto the upper side of the beam head of the erected box girder 200.

[0071] In another technical solution, as shown in Figure 6, a first limit switch 2181 is provided at the bottom of the opening of the U-shaped locking component 218. The first limit switch 2181 is electrically connected to the forward and reverse motor 216. When the forward and reverse motor 216 rotates forward, the lower end of the support rod 214 swings down and is locked in the U-shaped locking component 218. The side of the lower end of the support rod 214 touches the first limit switch 2181, and the first limit switch 2181 sends a signal to the forward and reverse motor 216, and the forward and reverse motor 216 automatically stops working.

[0072] In another technical solution, as shown in Figure 4, a second limit switch 223 is provided on the front side of the second fixing member 22. The second limit switch 223 is electrically connected to the forward and reverse motor 216. When the fixing mechanism 2 moves forward and the rear side of the second fixing member 22 abuts against the front side of the beam head of the erected box girder 200, the front side of the beam head of the erected box girder 200 touches the second limit switch 223. The second limit switch 223 sends a signal to the forward and reverse motor 216, and the forward and reverse motor 216 automatically reverses, driving the sleeve 215 to rotate in the opposite direction accordingly. The two fourth screws 217 retract from both sides respectively, driving the lower end of the support rod 214 to swing upward. The lower end of the support rod 214 disengages from the U-shaped locking member 218. When the first fixing member 21 sinks to the upper side of the beam head of the erected box girder 200, the forward and reverse motor 216 is manually stopped.

[0073] During actual construction, slight deviations may occur between the workers' operations and the design requirements. For example, the U-shaped ear plate may be installed too high or too low on the front support leg 100 column, or there may be a misalignment between the front support leg 100 and the already erected box girder 200. In this case, the lower end of the diagonal brace 1 and the first fixing member 21 cannot be hinged. An adjusting screw can be installed in the middle of the diagonal brace, and the lower end of the diagonal brace 1 and the first fixing member 21 can be hinged by adjusting the overall length of the diagonal brace. However, adjusting the adjusting screw is inconvenient on the construction site. In another technical solution, as shown in Figure 3, a fine-tuning mechanism is provided at the rear of the first fixing member 21. The fine-tuning mechanism includes:

[0074] The first slide groove 211 is arranged on the upper rear part of the first fixing member 21 in the front-back direction, and its front and rear ends are closed.

[0075] The slide block 212 is slidably connected to the first slide groove 211 and hinged to the lower end of the diagonal brace 1.

[0076] The second screw 213 extends rearward from the rear end of the first slide groove 211. Its shaft is rotatably connected to the front and rear ends of the first slide groove 211 via bearings and is self-lockingly threaded to the slide block 212.

[0077] When the U-shaped ear plate is installed too high or too low on the front support leg 100 column, causing the lower end of the diagonal brace 1 and the first fixing member 21 to not be hinged, the second screw 213 can be rotated to push the slide block 212 to move back and forth in the first slide groove 211, thereby compensating for the adverse effects caused by the U-shaped ear plate being installed too high or too low on the front support leg 100 column, and allowing the lower end of the diagonal brace 1 and the first fixing member 21 to be hinged.

[0078] During the installation of the front outrigger diagonal brace structure, the fixing mechanism 2 is hoisted onto the already erected box girder 200 and positioned directly behind the front outrigger 100 column using a gantry crane on the bridge erecting machine. In actual construction, there may be a deviation in the left-right direction, preventing the lower end of the diagonal brace 1 from being hinged to the first fixing member 21. In another technical solution, windows 2111 are provided on both the left and right side walls of the first slide groove 211, and the slide block 212 includes:

[0079] The second slide groove 2121 is arranged on the upper side of the slide block 212 in the left-right direction, and its left and right ends are closed.

[0080] The hinge seat 2122 is slidably connected to the second slide groove 2121 in the left and right directions, and is hinged to the lower end of the diagonal brace 1;

[0081] The third screw 2123 has one end extending outward from the window 2111 at the same end. Its shaft is rotatably connected to the left and right ends of the second slide groove 2121 via bearings and is self-lockingly threaded to the hinge seat 2122.

[0082] When the overhead crane lowers the fixing mechanism 2 onto the box girder 200 and there is a deviation in the left or right direction, it is not necessary to move the fixing mechanism 2. Instead, the third screw 2123 can be rotated to adjust the position of the hinge seat 2122 in the second slide groove 2121, thereby improving construction efficiency.

[0083] This invention also provides a construction method for the diagonal bracing structure of the front outrigger of a bridge erecting machine, comprising the following steps:

[0084] Step 1: Before the front support leg 100 is installed on the pier, the upper end of the diagonal brace 1 is pre-hinged and installed on the rear side of the column of the front support leg 100.

[0085] Step 2: Use the overhead crane on the bridge erecting machine to hoist the fixing mechanism 2 onto the head of the already erected box girder 200 and position it directly behind the front support leg 100 column. The first fixing member 21 is located on the upper side of the head of the already erected box girder 200, and the rear side of the second fixing member 22 abuts against the front side of the head of the already erected box girder 200.

[0086] Step 3: Rotate the first screw 222 so that its upper end touches the lower side of the top wall 201;

[0087] Step 4: Connect the lower end of the hinge seat 2122 and the diagonal brace 1.

[0088] Furthermore, step 2 also includes:

[0089] Start the forward and reverse motor 216, so that the support rod 214 is vertically fitted into the U-shaped locking member 218. Move the fixing mechanism 2, first so that the fixing mechanism 2 is located directly behind the front support leg 100 column, and then so that the rear side of the second fixing member 22 abuts against the front side of the beam head of the erected box girder 200. Start the forward and reverse motor 216 again, so that the support rod 214 is disengaged from the U-shaped locking member 218 from both sides, and the first fixing member 21 sinks onto the upper side of the beam head of the erected box girder 200.

[0090] Furthermore, prior to step 4, there are the following steps:

[0091] Based on the relative position of the lower end of the diagonal brace 1 and the hinge seat 2122, rotate the second screw 213 and the third screw 2123 to adjust the position of the hinge seat 2122 to be aligned with the lower end of the diagonal brace 1, and align the hinge hole of the hinge seat 2122 with the hinge hole of the lower end of the diagonal brace 1 in the front-back and left-right directions.

[0092] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A front leg inclined bracing structure between a front leg (100) of a bridge girder erection machine and a erected box girder (200), for fixing and supporting the front leg (100) of the bridge girder erection machine on the head of the erected box girder (200), characterized in that, The utility model relates to a box girder erecting device, including: inclined support rod (1), the upper end is hinged with front support leg (100); fixed mechanism (2) is arranged in the lower end of inclined support rod (1), including: first fixed part (21) is arranged on the upper side of the beam head of the erected box girder (200), and is hinged with the lower end of inclined support rod (1); Second fixed part (22) is arranged on the lower side of the front end of first fixed part (21), and the rear side thereof is in abutment with the front side of the beam head of the erected box girder (200), Second fixed part (22) includes: Lug (221) is vertically arranged on the rear side of second fixed part (22), and is located below the top wall (201) of the erected box girder (200); First screw rod (222) is self-locking threaded connection with lug (221), and the upper end passes through lug (221) from below to above and is perpendicular to top wall (201).

2. The front support leg diagonal brace structure of the bridge erecting machine according to claim 1, characterized in that, The upper end of first screw rod (222) is provided with an elastic wear-resistant layer (2221).

3. The bridge-launching machine front outrigger structure according to claim 1, characterized in that, The middle part of first fixed part (21) is provided with a moving mechanism, and the moving mechanism includes: Supporting rod (214) is arranged on the side wall of first fixed part (21) respectively, the middle part of supporting rod (214) is hinged with the upper end of the side wall of first fixed part (21) on the same side, and universal wheel is arranged on the lower end of supporting rod (214); Sleeve (215) is fixedly arranged on the upper side of first fixed part (21), and is rotatably connected with first fixed part (21); Forward and reverse motor (216) is arranged on the upper side of first fixed part (21), and is drivingly connected with sleeve (215); Fourth screw rod (217) is provided with two ends, one end is inserted into the inside of sleeve (215), and is threadedly connected with sleeve (215), the other end is slidingly connected with the supporting rod (214) on the same side, and the screw rotation direction of the two fourth screw rods (217) is opposite; U-shaped clamping part (218) is arranged on the side wall of first fixed part (21) respectively, the opening of U-shaped clamping part (218) faces the outside, when supporting rod (214) is clamped into U-shaped clamping part (218), U-shaped clamping part (218) is used to limit the front and rear positions of supporting rod (214).

4. The bridge-launching machine front outrigger structure according to claim 3, characterized in that The bottom of the opening of U-shaped clamping part (218) is provided with first travel switch (2181), and first travel switch (2181) is electrically connected with forward and reverse motor (216).

5. The bridge-writer front leg diagonal brace structure of claim 3, wherein, Second travel switch (223) is arranged on the front side of second fixed part (22), and second travel switch (223) is electrically connected with forward and reverse motor (216).

6. The bridging machine front leg diagonal brace structure of claim 3, wherein, The rear part of first fixed part (21) is provided with a fine adjustment mechanism, and the fine adjustment mechanism includes: First sliding groove (211) is arranged on the upper side of the rear part of first fixed part (21) in the front and rear directions, and the front and rear ends are closed; Slide base (212) is slidingly connected with first sliding groove (211) in front and rear directions, and is hinged with the lower end of inclined support rod (1); A second screw rod (213) extends from the rear end of the first sliding groove (211), and the rod body is rotatably connected to the front end and the rear end of the first sliding groove (211) and is threadedly connected to the self-locking hinge seat (212).

7. The bridging machine front leg diagonal brace structure of claim 6, wherein, The first sliding groove (211) is provided with a window (2111) on the left and right sides, and the sliding seat (212) comprises: A second sliding groove (2121) is arranged on the upper side of the sliding seat (212) in the left-right direction and is closed at both ends; A hinge seat (2122) is slidably connected to the second sliding groove (2121) and is hingedly connected to the lower end of the diagonal brace rod (1); A third screw rod (2123) extends from the window (2111) at one end, and the rod body is rotatably connected to the left end and the right end of the second sliding groove (2121) and is threadedly connected to the self-locking hinge seat (2122).

8. The construction method of the diagonal brace structure of the front support leg of the bridge girder erection machine according to claim 7, comprising the following steps: Step 1: The front support leg (100) is installed in front of the pier, and the upper end of the diagonal brace rod (1) is hingedly installed on the rear side of the column of the front support leg (100); Step 2: The fixing mechanism (2) is lowered on the head of the erected box girder (200) and is located behind the column of the front support leg (100) by using the beam trolley on the bridge girder erection machine, wherein: the first fixing part (21) is arranged on the upper side of the head of the erected box girder (200), and the rear side of the second fixing part (22) abuts against the front side of the head of the erected box girder (200); Step 3: Rotate the first screw rod (222) so that the upper end of the first screw rod (222) abuts against the lower side of the top wall (201); Step 4: Connect the hinge seat (2122) and the lower end of the diagonal brace rod (1). In step 2, the following steps are further included:

9. The construction method according to claim 8, characterized in that, Start the forward and reverse motor (216) to vertically clamp the support rod (214) in the U-shaped clamping part (218), move the fixing mechanism (2), first let the fixing mechanism (2) be located in the position directly behind the column of the front support leg (100), then let the rear side of the second fixing part (22) abut against the front side of the head of the erected box girder (200), and start the forward and reverse motor (216) again to let the support rod (214) be separated from the U-shaped clamping part (218) on both sides, and the first fixing part (21) is lowered on the upper side of the head of the erected box girder (200). Before step 4, the following steps are further included:

10. The construction method according to claim 8, characterized in that, According to the relative position of the lower end of the diagonal brace rod (1) and the hinge seat (2122), rotate the second screw rod (213) and the third screw rod (2123) to adjust the position of the hinge seat (2122) to be aligned with the lower end of the diagonal brace rod (1). ​

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