Anti-settling bridge girder erection machine front supporting leg device and construction method thereof

Abstract

The invention relates to an anti-sedimentation bridge girder erection machine front supporting leg device and a construction method thereof.The anti-sedimentation bridge girder erection machine front supporting leg device comprises a main beam, a lifting mechanism and a supporting rod, the lifting mechanism is provided with a first connecting part and a second connecting part, the supporting rod is provided with a first connecting matching part and a second connecting matching part, and when the first connecting part is connected with the first connecting matching part, the second connecting matching part is matched with the first connecting matching part; when the second connecting part and the second connecting matching part are disconnected, the supporting rods are static relative to the lifting mechanism, and the second connecting part and the second connecting matching part are connected, the first connecting part and the first connecting matching part are disconnected, the lifting mechanism drives the supporting rods to move downwards, automatic plug pin mechanisms are arranged on the supporting rods, and a movable beam is arranged between the two supporting rods. According to the anti-sedimentation bridge girder erection machine front supporting leg device and the construction method thereof, the supporting rods are pressed by the oil cylinders to be inserted into a seabed or a riverbed to avoid sedimentation of the bridge girder erection machine during construction, the bottom ground supporting area is increased through the movable beams, stress is uniform and reasonable, safety and reliability are achieved, and the safety and stability of the bridge girder erection machine are enhanced.

Description

Technical Field

[0001] This invention relates to the field of bridge construction equipment technology, and in particular to a front outrigger device for an anti-settlement bridge erecting machine, and a construction method for using the front outrigger device. Background Technology

[0002] Steel trestle bridges are generally used for the construction of piers of cross-sea and cross-river highway bridges. These trestle bridges are erected according to construction needs and can serve as material transport channels and construction work platforms. They can be disassembled and recycled after construction. However, the construction of steel trestle bridges requires a certain amount of construction time. Since they are laid along the entire length of the designed bridge, they are subject to wind, sea tides, and complex geological conditions. Therefore, steel trestle bridges themselves need to have high stability and can easily become a source of project risk.

[0003] Bridge erecting machines rely on the bridge's own structure and utilize the already constructed piers for beam erection. With modifications to the front end and the addition of suitable construction equipment, they can serve as reliable equipment for constructing pile foundations, piers, and other components. The front outriggers of the bridge erecting machine need to be inserted into the seabed or riverbed beforehand to maintain the stability of the entire machine, but this results in significant settlement and low safety. Summary of the Invention

[0004] The purpose of this invention is to provide a front support leg device for a bridge erecting machine that prevents settlement, which facilitates the integrated construction of bridge piers and bridges. The device has a simple and compact structure, low cost, and is easy to promote.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a front support leg device for a bridge erecting machine to prevent settlement and its construction method, including a main beam, a lifting mechanism hinged to the bottom of the main beam, and a support rod detachably connected to the lifting mechanism; Two support rods are vertically arranged. The two ends of the lifting mechanism are respectively connected to the two support rods. The lifting mechanism is provided with a first connecting part and a second connecting part along the length direction of the support rod, which are respectively connected to the support rod. The support rod is provided with a first connecting mating part and a second connecting mating part corresponding to the first connecting part and the second connecting part. When the first connecting part is connected to the first connecting mating part, the second connecting part is disconnected from the second connecting mating part, and the support rod is stationary relative to the lifting mechanism. When the second connecting part is connected to the second connecting mating part, the first connecting part is disconnected from the first connecting mating part, and the lifting mechanism drives the support rod to move downward. The connection is repeated alternately to transport the support rod to a preset position. Each of the support rods is equipped with an automatic pinning mechanism. A crossbeam is provided between the two support rods, and a winch is provided on the crossbeam. The output end of the winch is provided with a wire rope for hoisting the movable beam. After the movable beam is hoisted to the preset position, the automatic pinning mechanism fixes the two ends of the movable beam to the two support rods respectively. Furthermore, the lifting mechanism includes an upper beam, a lower beam, and a hydraulic cylinder. The upper beam and the lower beam are horizontally arranged. The upper beam is hinged to the main beam. The hydraulic cylinder is arranged between the upper beam and the lower beam, with one end of the hydraulic cylinder connected to the upper beam and the other end of the hydraulic cylinder connected to the lower beam. Two first connecting parts are symmetrically arranged at both ends of the upper beam, and two second connecting parts are symmetrically arranged at both ends of the lower beam.

[0006] Furthermore, both the first connecting part and the second connecting part are first connecting sleeves, and the side wall of the first connecting sleeve is provided with a connecting hole.

[0007] Furthermore, both the first connecting part and the second connecting part are insertion holes formed on the support rod. A plurality of insertion holes are arranged at intervals along the length direction of the support rod. An external pin passes through the connecting hole and the insertion hole to connect the first connecting sleeve and the support rod, as well as to connect the second connecting sleeve and the support rod.

[0008] Furthermore, the main beam is connected to the lifting mechanism via a hinged support.

[0009] Furthermore, the hinge support includes an upper hinge seat, a lower hinge seat, and a first pin, wherein the upper hinge seat and the lower hinge seat are connected by the first pin.

[0010] Furthermore, the movable beam is provided with a second connecting sleeve at each end for the support rod to pass through. The two side walls on opposite sides of the second connecting sleeve are provided with through holes, and the support rod is provided with a through hole corresponding to the through hole.

[0011] Furthermore, the automatic latching mechanism includes an electro-hydraulic actuator and a second pin. The electro-hydraulic actuator is mounted on the movable beam. The second pin is mounted on the power output end of the electro-hydraulic actuator and is driven through the through hole and the via hole to connect the movable beam and the support rod together.

[0012] Furthermore, the support rod includes a rod body and a tip. The rod body is a variable cross-section box-shaped structure. The first connecting part and the second connecting part are disposed on the rod body. The tip is disposed at the bottom end of the rod body. The support rod is inserted into a preset position through the tip to fix the support rod.

[0013] The beneficial effects of the anti-settlement bridge erecting machine front support leg device and its construction method provided by the present invention are as follows: Compared with existing technologies, the present invention provides a front outrigger device for an anti-settlement bridge erecting machine. This device uses a lifting mechanism to fix the position of the support rod, and a hydraulic cylinder to press the support rod into the seabed or riverbed to prevent the bridge erecting machine from settling during construction. A movable beam increases the bottom ground support area, resulting in uniform and reasonable stress distribution, ensuring safety and reliability, and enhancing the safety and stability of the bridge erecting machine. It is particularly suitable for construction of cross-sea or cross-river highway bridges where there are no piers ahead, requiring the bridge erecting machine to perform bored pile or precast pile installation. Simultaneously, the bridge erecting machine, as a construction platform, enables integrated construction of piers and the bridge structure, with a simple and compact structure, low cost, and ease of promotion.

[0014] The present invention also provides a construction method for an anti-settlement bridge erecting machine front outrigger, applied to the front outrigger device described above, the construction method comprising: Step 101: When the hydraulic cylinder is in the retracted state, the connection between the first connecting part and the first connecting mating part is released, and the second connecting part and the second connecting mating part are connected. Step 102: Extend the hydraulic cylinder to push the lower beam and move the support rod downward by one stroke. After it reaches the position, disconnect the second connecting part and the second connecting mating part, and connect the first connecting part and the first connecting mating part. Step 103: Retract the hydraulic cylinder to lift the lower beam to its original position, disconnect the first connecting part from the first connecting mating part, and connect the second connecting part from the second connecting mating part. Step 104: Repeat steps 102 and 103 until the tip of the support rod is firmly inserted into the riverbed. Step 105: The winch lowers the movable beam to the riverbed surface via a steel wire rope. Step 106: The electro-hydraulic actuator pushes the second pin through the through hole on the second connecting sleeve and the through hole of the support rod, fixing the movable beam and the support rod. Step 107: After construction is completed, when pulling out the support rod, repeat steps 106 to 101 in reverse.

[0015] The present invention discloses a construction method for an anti-settlement front support leg of a bridge erecting machine. By applying it to the aforementioned anti-settlement front support leg device of a bridge erecting machine, it can effectively prevent the bridge erecting machine from settling on a soft foundation, improve the safety and efficiency of bridge construction, and is particularly suitable for bridge construction projects in complex environments and with poor geological conditions. Attached Figure Description

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

[0017] Figure 1 This is a schematic diagram of the overall structure of a bridge erecting machine front support leg device for preventing settlement, provided in an embodiment of the present invention. Figure 2 for Figure 1 Side view in the current state; Figure 3 A schematic diagram illustrating the connection relationship between the main beam, the lifting mechanism, and the support rod provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the hinged support provided in this embodiment of the invention; Figure 5 A schematic diagram illustrating the connection relationship between the movable beam, support rod, and automatic pin mechanism provided in an embodiment of the present invention; Figure 6 A schematic diagram of the connection relationship between the second connecting sleeve and the support rod provided in this embodiment of the invention; Figure 7 A schematic diagram of the overall structure of a bridge erecting machine front support leg device in a retracted state provided in an embodiment of the present invention; Figure 8 A schematic diagram of the overall structure of a bridge erecting machine front support leg device under tension state provided in an embodiment of the present invention.

[0018] In the diagram: 1. Main beam; 2. Hinge support; 21. Upper hinge seat; 22. Lower hinge seat; 23. First pin; 3. Lifting mechanism; 31. Upper beam; 32. First connecting sleeve; 321. Connecting hole; 33. Hydraulic cylinder pin; 34. Hydraulic cylinder; 35. Lower beam; 4. Support rod; 41. Insertion hole; 42. Through hole; 5. External pin A; 6. External pin B; 7. Crossbeam; 8. Winch; 9. Wire rope; 10. Movable beam; 101. Second connecting sleeve; 102. Through hole; 11. Automatic pin mechanism; 111. Electro-hydraulic actuator; 112. Second pin; 12. Riverbed. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this embodiment clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this embodiment and are not intended to limit this embodiment.

[0020] Please refer to the following: Figures 1 to 8The following describes an anti-settlement front support leg device for a bridge erecting machine and its construction method provided in this embodiment. The anti-settlement front support leg device for a bridge erecting machine in this embodiment includes a main beam 1, a lifting mechanism 3 hinged to the bottom of the main beam 1, and a support rod 4 detachably connected to the lifting mechanism 3.

[0021] Among them, there are two vertically arranged support rods 4, and the two ends of the lifting mechanism 3 are respectively connected to the two support rods 4. The lifting mechanism 3 is provided with a first connecting part and a second connecting part connected to the support rods 4 along the length direction of the support rods 4. The support rods 4 are provided with a first connecting mating part and a second connecting mating part corresponding to the first connecting part and the second connecting part.

[0022] When the first connecting part and the first connecting mating part are connected, the second connecting part and the second connecting mating part are disconnected, and the support rod 4 is stationary relative to the lifting mechanism 3. When the second connecting part and the second connecting mating part are connected, the first connecting part and the first connecting mating part are disconnected, and the lifting mechanism 3 drives the support rod 4 to move downward. The connection is repeated alternately to transport the support rod 4 to the preset position.

[0023] Each support rod 4 is equipped with an automatic pin mechanism 11. A crossbeam 7 is set between the two support rods 4. A winch 8 is set on the crossbeam 7. A wire rope 9 for hoisting the movable beam 10 is set at the output end of the winch 8. After the movable beam 10 is hoisted to the preset position, the automatic pin mechanism 11 fixes the two ends of the movable beam 10 to the two support rods 4 respectively.

[0024] This invention provides a front outrigger device for an anti-settlement bridge erecting machine. The position of the support rod 4 is fixed by a lifting mechanism 3, and the support rod 4 is pressed into the seabed or riverbed 12 by a hydraulic cylinder 34 to prevent the bridge erecting machine from settling during construction. The movable beam 10 increases the bottom ground support area, resulting in uniform and reasonable stress distribution, ensuring safety and reliability, and enhancing the safety and stability of the bridge erecting machine. It is particularly suitable for construction of cross-sea or cross-river highway bridges where there are no piers ahead, requiring the bridge erecting machine to perform bored pile or precast pile installation. Simultaneously, the bridge erecting machine serves as a construction platform, enabling integrated construction of piers and the bridge itself. Its simple and compact structure, low cost, and ease of promotion make it suitable for widespread adoption.

[0025] Based on the overall description of the above structure, an exemplary structure of the anti-settlement bridge erecting machine front support leg device in this embodiment is as follows: Figure 1 and Figure 2 As shown, two main beams 1 are arranged side by side in the horizontal direction. The lifting mechanism 3 is located at the bottom of each main beam 1, and the left and right ends of the lifting mechanism 3 are respectively connected to two support rods 4, which can drive the support rods 4 to move downward synchronously to insert the support rods 4 into the riverbed and complete the fixation.

[0026] In this embodiment, as a preferred implementation, the main beam 1 is connected to the lifting mechanism 3 via a hinged support 2, allowing the lifting mechanism 3 to rotate freely at a certain angle, adapting to terrain changes and facilitating overall setup. See details below. Figure 3 and Figure 4 As shown, the hinge support 2 includes an upper hinge seat 21, a lower hinge seat 22, and a first pin 23. The upper hinge seat 21 and the lower hinge seat 22 are connected by the first pin 23. Meanwhile, in a preferred embodiment, the lifting mechanism 3 includes an upper beam 31, a lower beam 35, and a hydraulic cylinder 34. The upper beam 31 and the lower beam 35 are horizontally arranged. The upper beam 31 is hinged to the main beam 1. The hydraulic cylinder 34 is arranged between the upper beam 31 and the lower beam 35. One end of the hydraulic cylinder 34 is connected to the upper beam 31 through a hydraulic cylinder 34 pin, and the other end of the hydraulic cylinder 34 is connected to the lower beam 35 through a hydraulic cylinder 34 pin. Two first connecting parts are symmetrically arranged at both ends of the upper beam 31, and two second connecting parts are symmetrically arranged at both ends of the lower beam 35.

[0027] Still refer to Figure 3 As shown, the upper beam 31 and lower beam 35 are arranged vertically with a certain gap between them. A hydraulic cylinder 34 is positioned between the upper beam 31 and lower beam 35, with both ends of the cylinder hinged to the upper beam 31 and lower beam 35 respectively. The upper beam 31 has a first connecting part at its end, and the lower beam 35 has a second connecting part at its end. The upper beam 31 is connected to the support rod 4 via the first connecting part, and the lower beam 35 is connected to the support rod 4 via the second connecting part. When the upper beam 31 is connected to the support rod 4, the hydraulic cylinder 34 is in a retracted state. When the lower beam 35 is connected to the support rod 4, the connection between the upper beam 31 and the support rod 4 is released, and the hydraulic cylinder 34 begins to extend. The lower beam 35 drives the support rod 4 to move downwards relative to the upper beam 31. After the hydraulic cylinder 34 has extended or retracted to a certain stroke, the connection between the lower beam 35 and the support rod 4 is released, and the upper beam 31 is reconnected to the support rod 4. The hydraulic cylinder 34 retracts, driving the lower beam 35 back to its original position.

[0028] In one preferred embodiment, both the first connecting part and the second connecting part are configured as a first connecting sleeve 32, which is hollow inside to allow the support rod 4 to pass through from top to bottom. Furthermore, both the first connecting mating part and the second connecting mating part are insertion holes 41 formed on the support rod 4. An external pin can pass through the connecting hole 321 and the insertion hole 41 to connect the support rod 4 to the upper beam 31 and to the lower beam 35.

[0029] For ease of description, in this embodiment, the external pin provided on the upper beam 31 is referred to as external pin A 5, and the external pin provided on the lower beam 35 is referred to as external pin B 6. When external pin A 5 connects the first connecting sleeve 32 and the support rod 4, the positions of the upper beam 31 and the support rod 4 are relatively fixed; when external pin B 6 connects the first connecting sleeve 32 and the support rod 4, the positions of the lower beam 35 and the support rod 4 are relatively fixed.

[0030] In this embodiment, as a preferred implementation, the support rod 4 includes a rod body and a tip. The rod body is a variable cross-section box structure. The characteristic of this structure is that the size and shape of the cross-section change at different positions according to the load and stress distribution it bears, in order to adapt to its specific span and load requirements. The first connecting part and the second connecting part are provided on the rod body, and the tip is provided at the bottom end of the rod body. The support rod 4 is inserted into a preset position through the tip to fix the support rod 4.

[0031] Reference Figure 3 As shown, multiple insertion holes 41 are arranged at intervals along the length of the support rod 4. The connecting hole 321 of the first connecting sleeve 32 on the upper beam 31 corresponds to one of its insertion holes 41 and is connected by an external pin A 5 to determine the initial position of the lifting mechanism 3. The connecting hole 321 on the first connecting sleeve 32 on the lower beam 35 is connected to the corresponding insertion hole 41 by an external pin B 6 to facilitate the lifting mechanism 3 in driving the support rod 4.

[0032] After the aforementioned lifting mechanism 3 fixes the support rod 4 to the riverbed 12 or seabed, the winch 8 installed on the crossbeam 7 between the two support rods 4 starts to drive the movable beam 10 to move via the wire rope 9, so as to hoist the movable beam 10 to the riverbed 12 or seabed, so as to facilitate connection with the support rod 4, thereby increasing the contact area with the riverbed 12 or seabed and improving the overall stability.

[0033] After the movable beam 10 is hoisted to the preset position, the movable beam 10 and the support rod 4 are connected together by the automatic pin mechanism 11. (Refer to...) Figure 5 and Figure 6As shown, the movable beam 10 has second connecting sleeves 101 at both ends for the support rod 4 to pass through. The two side walls of the second connecting sleeves 101 on opposite sides have through holes 102, and the support rod 4 has a through hole 42 corresponding to the through hole 102. Preferably, the automatic pin mechanism 11 includes an electro-hydraulic push rod 111 and a second pin 112. The electro-hydraulic push rod 111 is mounted on the movable beam 10; the second pin 112 is mounted on the power output end of the electro-hydraulic push rod 111. The second pin 112 is driven through the through hole 102 and the through hole 42 to connect the movable beam 10 and the support rod 4 together. This effectively prevents the bridge erecting machine from settling when the support rod 4 is inserted into the seabed or riverbed 12. Simultaneously, the increased movement increases the bottom support area, making the entire device more evenly and reasonably stressed, safe and reliable, thus enhancing the safety and stability of the bridge erecting machine.

[0034] This embodiment also provides a construction method for the front outrigger of a bridge erecting machine to prevent settlement, and refers to... Figure 7 and Figure 8 As shown in the figure, A represents the retracted state of the hydraulic cylinder, and B represents the extended state of the hydraulic cylinder. The method includes: Step 101: When the hydraulic cylinder 34 is in the retracted state, the connection between the first connecting part and the first connecting mating part is released, and the second connecting part and the second connecting mating part are connected. Step 102: Extend the hydraulic cylinder 34 to push the lower beam 35 and drive the support rod 4 to move downward by one stroke. After it reaches the position, disconnect the second connecting part and the second connecting mating part, and connect the first connecting part and the first connecting mating part. Step 103: Retract the hydraulic cylinder 34 to lift the lower beam 35 to its original position, disconnect the first connecting part from the first connecting mating part, and connect the second connecting part from the second connecting mating part. Step 104: Repeat steps 102 and 103 until the tip of the support rod 4 is firmly inserted into the riverbed 12. Step 105: The winch 8 lowers the movable beam 10 to the surface of the riverbed 12 via the wire rope 9; Step 106: The electro-hydraulic actuator 111 pushes the second pin 112 through the through hole 102 on the second connecting sleeve 101 and the through hole 42 of the support rod 4 to fix the movable beam 10 and the support rod 4. Step 107: After construction is completed, when the support rod 4 is pulled out, repeat steps 106 to 101 in reverse.

[0035] This embodiment describes a construction method for an anti-settlement bridge erecting machine front outrigger, which is applied to the aforementioned anti-settlement bridge erecting machine front outrigger device. This method can improve the safety and efficiency of bridge construction in complex environments and with poor geological conditions.

[0036] The above description is only a preferred embodiment of this embodiment and is not intended to limit this embodiment. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this embodiment should be included within the protection scope of this embodiment.

Claims

1. A front support leg device for a bridge erecting machine to prevent settlement, characterized in that, It includes a main beam (1), a lifting mechanism (3) hinged to the bottom of the main beam (1), and a support rod (4) detachably connected to the lifting mechanism (3). There are two vertically arranged support rods (4), and the two ends of the lifting mechanism (3) are respectively connected to the two support rods (4). The lifting mechanism (3) is provided with a first connecting part and a second connecting part connected to the support rod (4) along the length direction of the support rod (4). The support rod (4) is provided with a first connecting mating part and a second connecting mating part corresponding to the first connecting part and the second connecting part. When the first connecting part is connected to the first connecting mating part, the second connecting part is disconnected from the second connecting mating part, and the support rod (4) is stationary relative to the lifting mechanism (3). When the second connecting part is connected to the second connecting mating part, the first connecting part is disconnected from the first connecting mating part, and the lifting mechanism (3) drives the support rod (4) to move downward. The connection is repeated alternately to transport the support rod (4) to a preset position. Each of the support rods (4) is provided with an automatic pin mechanism (11), and a crossbeam (7) is provided between the two support rods (4). A winch (8) is provided on the crossbeam (7), and a wire rope (9) for hoisting the movable beam (10) is provided at the output end of the winch (8). After the movable beam (10) is hoisted to the preset position, the automatic pin mechanism (11) fixes the two ends of the movable beam (10) to the two support rods (4) respectively.

2. The anti-settlement bridge erecting machine front support leg device according to claim 1, characterized in that, The lifting mechanism (3) includes an upper crossbeam (7), a lower crossbeam (7), and a hydraulic cylinder (34). The upper crossbeam (7) and the lower crossbeam (7) are horizontally arranged. The upper crossbeam (7) is hinged to the main beam (1). The hydraulic cylinder (34) is arranged between the upper crossbeam (7) and the lower crossbeam (7). One end of the hydraulic cylinder (34) is connected to the upper crossbeam (7), and the other end of the hydraulic cylinder (34) is connected to the lower crossbeam (7). The upper crossbeam (7) has two first connecting parts symmetrically arranged at both ends, and the lower crossbeam (7) has two second connecting parts symmetrically arranged at both ends.

3. The anti-settlement bridge erecting machine front support leg device according to claim 2, characterized in that, Both the first connecting part and the second connecting part are first connecting sleeves (32), and the side wall of the first connecting sleeve (32) is provided with connecting holes (321).

4. The anti-settlement bridge erecting machine front support leg device according to claim 3, characterized in that, Both the first connecting part and the second connecting part are insertion holes (41) opened on the support rod (4). Multiple insertion holes (41) are arranged at intervals along the length direction of the support rod (4). An external pin passes through the connecting hole (321) and the insertion hole (41) to connect the first connecting sleeve (32) and the support rod (4) as well as to connect the second connecting sleeve (101) and the support rod (4).

5. The anti-settlement bridge erecting machine front support leg device according to claim 1, characterized in that, The main beam (1) is connected to the lifting mechanism (3) via a hinged support (2).

6. The anti-settlement bridge erecting machine front support leg device according to claim 5, characterized in that, The hinge support (2) includes an upper hinge (21), a lower hinge (22) and a first pin (23), and the upper hinge (21) and the lower hinge (22) are connected by the first pin (23).

7. The anti-settlement bridge erecting machine front support leg device according to claim 1, characterized in that, The movable beam (10) is provided with a second connecting sleeve (101) at both ends for the support rod (4) to pass through. The two side walls of the second connecting sleeve (101) on opposite sides are provided with through holes (102), and the support rod (4) is provided with a through hole (42) corresponding to the through hole (102).

8. The anti-settlement bridge erecting machine front support leg device according to claim 7, characterized in that, The automatic pin mechanism (11) includes an electro-hydraulic actuator (111) and a second pin (112). The electro-hydraulic actuator (111) is mounted on the movable beam (10). The second pin (112) is mounted on the power output end of the electro-hydraulic actuator (111). The second pin (112) is driven through the through hole (102) and the through hole (42) to connect the movable beam (10) and the support rod (4) together.

9. A bridge erecting machine front support leg device for preventing settlement according to any one of claims 1 to 8, characterized in that, The support rod (4) includes a rod body and a tip. The rod body is a variable cross-section box structure. The first connecting part and the second connecting part are disposed on the rod body. The tip is disposed at the bottom end of the rod body. The support rod (4) is inserted into a preset position through the tip to fix the support rod (4).

10. A construction method for the front outrigger of a bridge erecting machine to prevent settlement, characterized in that, When applied to the front outrigger device according to claims 1-9, the construction method includes: Step 101: The oil cylinder (34) is in the retracted state, the connection between the first connecting part and the first connecting mating part is released, and the second connecting part and the second connecting mating part are connected. Step 102: Extend the hydraulic cylinder (34) to push the lower crossbeam (7) and drive the support rod (4) to move downward by one stroke. After reaching the position, disconnect the second connecting part and the second connecting mating part, and connect the first connecting part and the first connecting mating part. Step 103: retract the hydraulic cylinder (34) to lift the lower crossbeam (7) to its original position, disconnect the first connecting part from the first connecting mating part, and connect the second connecting part from the second connecting mating part; Step 104, repeat steps 102 and 103 until the tip of the support rod (4) is firmly inserted into the riverbed (12); Step 105: The winch (8) lowers the movable beam (10) to the surface of the riverbed (12) via the wire rope (9); Step 106: The electro-hydraulic actuator (111) pushes the pin through the through hole (102) on the second connecting sleeve (101) and the through hole (42) of the support rod (4) to fix the movable beam (10) and the support rod (4). Step 107: After the construction is completed, when the support rod (4) is pulled out, repeat steps 106 to 101 in reverse.

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