High-efficiency single-beam bridge girder erection machine and use method thereof

Abstract

The invention relates to a high-efficiency single-beam bridge girder erection machine and a use method thereof. The high-efficiency single-beam bridge girder erection machine is characterized in that a pair of front hoisting crown blocks and a pair of rear hoisting crown blocks are in sliding support fit with side guide rails on the two sides of a main beam respectively; the front telescopic supporting leg consists of a front telescopic supporting leg upper part and a front telescopic supporting leg lower part; the front telescopic supporting leg upper part is vertically and fixedly connected with the lower end of the front part of the main beam; the rear telescopic supporting leg consists of a rear telescopic supporting leg upper part and a rear telescopic supporting leg lower part; the rear telescopic supporting leg upper part is in longitudinal sliding support fit with a bottom rail fixed at the lower end of the front part of the main beam; the two sets of front folding telescopic supporting legs are installed on the two sides of the front portion of the main beam respectively. Each group of front folding telescopic supporting legs consists of a front folding telescopic supporting leg upper part and a front folding telescopic supporting leg lower part; the upper part of the front folding telescopic supporting leg is fixedly connected outside the front side part of the main beam, and front and rear traveling wheels are mounted at the lower end of the lower part of the front folding telescopic supporting leg; and front and rear wheel sets of the support legs are arranged at the rear part of the main beam and are positioned on the front side and the rear side of the rear folding telescopic support legs. The method is suitable for narrow places, and a beam transporting vehicle is not needed to participate in erecting work.

Description

Technical Field

[0001] The invention relates to the field of bridge construction equipment, in particular to a high-efficiency single-beam bridge erecting machine and a use method thereof. Background Art

[0002] With the increase in the number of people traveling, the construction and development of railway transportation is particularly important. As a key equipment in the construction of high-speed railways, bridge erection machines play an indispensable role. Bridge erection machines are a kind of efficient mechanical equipment specially used for bridge construction, mainly used to lift and install bridge structural parts, such as prefabricated beams, steel beams, etc.

[0003] In current construction practice, bridge erection machines have been widely used in the construction of highway and railway bridges. When erecting a bridge, the front and rear beam cranes are usually used to work together to accurately move the prefabricated beams between the two bridge piers to ensure the accuracy and safety of the construction.

[0004] Many existing bridge erection machines are poorly designed for complex environments and are too large and bulky. For example, in special working conditions such as narrow construction sites, mountainous areas or tunnels, the operating space and construction efficiency of existing bridge erection machines are limited. Moreover, most bridge erection machines require the cooperation of beam transport vehicles to carry out erection work, which greatly reduces the operating efficiency. Summary of the invention

[0005] In view of the above technical problems, the present invention proposes a high-efficiency single-beam bridge erecting machine and a method of using the machine, which is suitable for narrow areas, has strong adaptability, and does not require a beam transport vehicle to participate in the erection work.

[0006] One of the above-mentioned purposes of the present invention is achieved by the following technical solution:

[0007] A high-efficiency single-beam bridge erecting machine, characterized by comprising a main beam, a front hoisting trolley, a rear hoisting trolley, a front telescopic outrigger, a rear telescopic outrigger, a front folding telescopic outrigger, a rear folding telescopic outrigger, an outrigger front wheel set and an outrigger rear wheel set;

[0008] Side guide rails are arranged on both sides of the main beam, and a pair of front hoisting cranes and a pair of rear hoisting cranes are respectively matched with the side guide rails on both sides of the main beam for sliding support, and the front hoisting crane and the rear hoisting crane on the same side are connected to the corresponding first synchronous belts by bolts, and the first synchronous belts on both sides are supported on the synchronous wheels at both ends of each, and the synchronous wheel at one end is connected to the first motor installed inside the front end of the main beam through the wheel shaft, so as to transport the prefabricated beam to between the two piers;

[0009] The front telescopic leg is composed of an upper part of the front telescopic leg and a lower part of the front telescopic leg. The upper part of the front telescopic leg is vertically fixedly connected to the lower end of the front part of the main beam. A hydraulic cylinder is also connected between the lower part of the front telescopic leg and the upper part of the front telescopic leg to realize the vertical movement and fixation of the lower part of the front telescopic leg in the upper part of the front telescopic leg.

[0010] The rear telescopic leg is composed of an upper part of the rear telescopic leg and a lower part of the rear telescopic leg. The upper part of the rear telescopic leg forms a sliding support with the bottom track fixed at the lower end of the front part of the main beam along the longitudinal direction. A hydraulic cylinder is connected between the lower part of the rear telescopic leg and the upper part of the rear telescopic leg to realize the vertical movement and fixation of the lower part of the rear telescopic leg in the upper part of the rear telescopic leg. The upper part of the rear telescopic leg is connected to a second synchronous belt, and the second synchronous belt is connected to the second motor drive through a corresponding synchronous wheel.

[0011] Two groups of front folding telescopic legs are respectively installed on both sides of the front part of the main beam and aligned left and right; each group of front folding telescopic legs consists of an upper part of the front folding telescopic leg and a lower part of the front folding telescopic leg; the upper part of the front folding telescopic leg is fixedly connected to the outside of the front side of the main beam, and the upper end of the lower part of the front folding telescopic leg is connected to the upper part of the front folding telescopic leg through a hinge shaft, and the two are connected through a hydraulic cylinder; the lower part of the front folding telescopic leg adopts a telescopic leg structure, and two front and rear running wheels are installed at the lower end of the lower part of the front folding telescopic leg, and at least one of the two running wheels is connected to the third motor drive;

[0012] The two sets of rear folding telescopic legs are the same as the two front folding support structures, and the two sets of rear folding telescopic legs are installed at the outer positions on both sides of the rear of the main beam;

[0013] The front wheel group of the outrigger and the rear wheel group of the outrigger are installed at the rear part of the main beam and are respectively located at the front side and the rear side of the rear folding telescopic outrigger.

[0014] Moreover, the front telescopic legs are in the form of U-shaped legs as a whole.

[0015] The second object of the present invention is achieved by the following technical solution:

[0016] A method for using a high-efficiency single-beam bridge erecting machine for erecting a pipeline prefabricated bridge comprises the following steps:

[0017] Step 1: Place the bridge erecting machine on the erected beam surface through the front telescopic folding legs and the rear telescopic folding legs, and transport the prefabricated beam to be erected to the rear of the bridge erecting machine by a beam transport vehicle or a crane to form an initial working state;

[0018] Step 2: Start the bridge erecting machine, and move it backwards by folding the front telescopic legs and the rear telescopic legs, until the rear telescopic legs reach the vicinity of the front end of the precast beam and the rear wheel group of the legs reaches the front end surface of the precast beam;

[0019] Step 3: The rear folding telescopic outrigger is contracted and shortened by a hydraulic cylinder, and the lower part of the rear folding telescopic outrigger is turned outward to a horizontal position, and the rear wheel group of the outrigger is supported on the surface of the prefabricated beam, and the front wheel group of the outrigger is also supported on the surface of the prefabricated beam as the bridge erecting machine continues to move longitudinally backward;

[0020] Step 4: When the front wheel group of the outrigger moves to the rear end surface of the prefabricated beam, the lower part of the rear folding telescopic outrigger flips back to the initial position and extends, contacts the erected beam surface, and re-supports the entire bridge erecting machine;

[0021] Step 5: When the bridge erecting machine moves to a point where the pair of front cranes and the pair of rear cranes are both located above the prefabricated beams, the prefabricated beams are lifted off the ground by means of the slings connected to the cranes;

[0022] Step 6: The bridge erecting machine moves in reverse direction and moves forward with the prefabricated beam. When the front folding telescopic bracket moves to the edge of the erected bridge, the rear telescopic leg is extended to contact the front end of the erected beam. At the same time, the lower part of the front folding telescopic leg is retracted and shortened, and flipped outward to a horizontal position.

[0023] Step 7: Using the rear telescopic legs as a fulcrum, the bridge erecting machine and the prefabricated beam continue to move forward under the movement of the rear folding telescopic legs;

[0024] Step 8: When the front telescopic legs of the bridge erecting machine move to the front end of the next pier to be erected, the front telescopic legs extend to a position in contact with the upper end of the pier;

[0025] Step 9: The rear telescopic legs are retracted and shortened, and move along the bottom track at the lower end of the main beam 1 to a position overlapping with the front telescopic legs; at the same time, the precast beam is driven by the front crane and the rear crane to move to the position where the bridge is to be erected;

[0026] Step 10: The front crane and the rear crane lower the prefabricated beam to complete the beam lowering;

[0027] Step 11. The front telescopic legs are retracted and shortened. At the same time, the front folding telescopic legs are flipped back to their original positions and extended to a position in contact with the newly erected beam surface. The entire bridge-erecting machine is re-supported and moved backward to the already erected beam surface, preparing for the erection of the next section of prefabricated beams.

[0028] The present invention has the advantages and positive effects:

[0029] (1) The present invention changes the structure of the previous O-type bridge erecting machine to a single-beam structure, and lifts the prefabricated beam on its guide rail to a designated position through the front hoisting crane and the rear hoisting crane, without the need for an O-shaped track. This makes the bridge erecting machine lighter, more compact, and occupies less space on the construction site, and can better adapt to narrow or crowded work areas, which is particularly important for scenes such as urban construction and bridge reconstruction. Traditional bridge erecting machines are usually large in size and difficult to transport and assemble.

[0030] (2) The front folding telescopic legs and the rear folding telescopic legs of the present invention both have telescopic and folding functions, and the overall height of the bridge erecting machine can be adjusted by telescoping the legs. Therefore, the bridge erecting machine is more flexible in the working environment and can pass through narrow spaces such as holes and tunnels, with little impact on the surrounding environment. This reduces the time and cost of disassembling and transporting the bridge erecting machine, and can effectively shorten the construction period.

[0031] (3) The bridge erection machine of the present invention is free from dependence on the beam transport vehicle during the erection process. When the telescopic legs are folded and moved to the end of the prefabricated beam, the rear wheel group of the legs contacts the surface of the prefabricated beam. At this time, when the telescopic legs are folded and retracted to both sides, the rear wheel group of the legs is supported on the surface of the prefabricated beam. At this time, the bridge erection machine moves backward as a whole so that the front wheel group of the legs is also supported on the surface of the prefabricated beam. This process can be completed without the cooperation of the beam transport vehicle. Therefore, the erection work can be directly carried out in cooperation with the crane truck, which reduces the equipment requirements and costs and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of the single-beam bridge erecting machine of the present invention.

[0033] Figure 2 This is the first working position diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0034] Figure 3 This is the second workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0035] Figure 4 This is the third workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0036] Figure 5 This is the fourth working position diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0037] Figure 6 This is the fifth workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0038] Figure 7 This is the sixth workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0039] Figure 8 This is the seventh workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0040] Fig. 9 This is the eighth workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0041] Fig.10 This is the ninth workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0042] Fig.11 This is the tenth workstation diagram of the method for using the single-beam bridge erecting machine of the present invention;

[0043] Fig.12 It is a schematic diagram of the lower structure of the front folding telescopic outrigger;

[0044] Fig.13 It is a schematic diagram of the lower structure of the rear folding telescopic outrigger;

[0045] In the figure: 1. main beam; 2. front lifting crane; 3. rear lifting crane; 4. front telescopic outrigger; 5. rear telescopic outrigger; 6. front folding telescopic outrigger; 7. rear folding telescopic outrigger; 8. outrigger front wheel assembly; 9. outrigger rear wheel assembly; 10. precast beam; 11. bridge pier; 601. lower part of front folding telescopic outrigger; 701. lower part of rear folding telescopic outrigger. DETAILED DESCRIPTION

[0046] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0047] A high-efficiency single-beam bridge erecting machine, see Figure 1-Figure 13 The invention point is: it mainly includes a main beam 1, a front lifting crane 2, a rear lifting crane 3, a front telescopic leg 4, a rear telescopic leg 5, a front folding telescopic leg 6, a rear folding telescopic leg 7, a leg front wheel group 8 and a leg rear wheel group 9.

[0048] The bridge erection machine mainly uses the main beam 1 as the main structure, and side guide rails are arranged on both sides of the main beam. A pair of front hoisting cranes and a pair of rear hoisting cranes are respectively matched with the side guide rails on both sides of the main beam. The front hoisting crane 2 and the rear hoisting crane 3 can move longitudinally on the side rails to achieve the effect of moving the precast beam. The front hoisting crane and the rear hoisting crane are gathered at a fixed distance. The front hoisting crane and the rear hoisting crane on the same side are connected to the corresponding first synchronous belt by bolts. The first synchronous belts on both sides are supported on the synchronous wheels at both ends of each. The synchronous wheel at one end is connected to the first motor (not shown) installed inside the front end of the main beam through the wheel axle, driving the two pairs of hoisting cranes to move longitudinally, thereby transporting the precast beam 10 to between the two bridge piers. The moving speed is determined by the motor speed.

[0049] The front telescopic leg 4 is composed of the front telescopic leg upper part and the front telescopic leg lower part. The entire front telescopic leg 4 is perpendicular to the beam surface. The front telescopic leg upper part is fixed to the front lower end of the main beam 1 through a flange, and the front telescopic leg lower part can be vertically moved and fixed in the front telescopic leg upper part. A hydraulic cylinder is also connected between the front telescopic leg lower part and the front telescopic leg upper part. The front telescopic leg lower part is extended to the required length and maintained fixed by the hydraulic cylinder. When the front telescopic leg lower part is working, it will be supported at the front end of the pier 11, thereby supporting its bridge erection machine so as to continue its subsequent work.

[0050] The rear telescopic leg 5 is composed of an upper part and a lower part of the rear telescopic leg. The entire rear telescopic leg 5 is perpendicular to the beam surface. A bottom track is provided at the lower end of the front part of the main beam 1. The upper part of the rear telescopic leg moves longitudinally on the bottom track through a slider, and the lower part of the rear telescopic leg can move vertically and be fixed in the upper part of the rear telescopic leg. Among them, the upper part of the rear telescopic leg is connected to a second synchronous belt (not shown in the figure), and the second synchronous belt is connected to the second motor drive through a corresponding synchronous wheel to achieve longitudinal movement. The hydraulic cylinder (not shown in the figure) is also connected between the lower part of the rear telescopic leg and the upper part of the rear telescopic leg. The lower part 701 of the rear telescopic leg is extended to the required length and maintained fixed through the operation of the hydraulic cylinder. When working, the lower part 701 of the rear telescopic leg will support the front end of the erected beam, supporting the bridge erection machine to move the prefabricated beam forward to the position of the two piers.

[0051] The front telescopic legs are in the form of U-shaped legs as a whole, so that during the process of beam erection, the rear telescopic legs can be moved to a position that overlaps with the front telescopic legs in the transverse direction.

[0052] Two groups of front folding telescopic legs are respectively installed at the outer alignment positions on both sides of the front of the main beam. Each group of front folding telescopic legs 6 consists of an upper part of the front folding telescopic leg and a lower part 601 of the front folding telescopic leg. The upper part of the front folding telescopic leg is connected to the outside of the front side of the main beam 1 through a flange, and the upper end of the lower part 601 of the front folding telescopic leg is connected to the upper part of the front folding telescopic leg through a hinge shaft. The two are connected through a hydraulic cylinder. The lower part of the front folding telescopic leg can be folded outward to a horizontal position through the operation of the hydraulic cylinder, so as to achieve the avoidance of the front hoisting crane and the rear hoisting crane driving the prefabricated beam to move forward. Among them, the lower part 601 of the front folding telescopic leg also has a telescopic function, which is similar to the front telescopic leg. The lower end of the lower part of the front folding telescopic leg is equipped with two front and rear running wheels, and at least one of the two running wheels is connected to the third motor drive to drive the front folding telescopic leg to move longitudinally on the erected beam. The front telescopic folding leg 6 can adapt to the working environment with narrow space through the folding and telescopic function. The rear folding telescopic legs 7 have the same function as the front folding telescopic legs 6. The structure thereof refers to the front folding telescopic legs. The rear folding telescopic legs are installed at both sides of the rear of the main beam, and the specific structure will not be repeated here.

[0053] The front wheel group 8 and the rear wheel group 9 of the outrigger are installed at the web hole at the rear fixed position of the main beam 1, and are respectively located at the front and rear positions of the rear folding telescopic outrigger. When the bridge erection machine moves to the front end of the precast beam 10, the rear folding telescopic outrigger 7 is close to the front end of the precast beam 10, and the rear wheel group 9 of the outrigger is located at the upper ends of both sides of the precast beam 10. As the rear folding telescopic outrigger 7 shortens, the rear wheel outrigger 9 is supported on the precast beam surface 10, and then the lower part of the rear folding telescopic outrigger is folded to both sides so that the bridge erection machine can move backward along the precast beam 10.

[0054] In the above structure, the distance between the front hoisting trolley 2 and the rear hoisting trolley 3 can be adjusted by adjusting the fixing position of the bolts according to actual needs.

[0055] In the above structure, the work at the end of the construction can be completed by adjusting the telescopic height of the front telescopic legs 4. It is only necessary to fix and support the lower part of the front telescopic legs to the two surfaces that have been erected in front.

[0056] In the above structure, the outrigger front wheel group 8 cooperates with the outrigger rear wheel group 9 to be supported on the surface of the prefabricated beam 10 so that the entire bridge erecting machine moves longitudinally backward along the prefabricated beam 10.

[0057] The working principle and workflow of the present invention are:

[0058] The device is used for erecting a pipeline prefabricated bridge, which includes the following steps:

[0059] (1) In the initial state, the precast beam 10 has been transported to the rear of the bridge erection machine by a beam transport vehicle or a crane, and the bridge erection machine is supported by the front telescopic folding legs 6 and the rear telescopic folding legs 7. The initial working state is as follows: Figure 1 As shown;

[0060] (2) Start the bridge erection machine and move it backwards through the front folding telescopic legs 6 and the rear folding telescopic legs 7. The rear folding telescopic legs 7 reach the vicinity of the front end of the precast beam 10 and the rear wheel group 9 of the legs reaches the front end surface of the precast beam 10. Figure 2 As shown;

[0061] (3) At this time, the rear folding telescopic outrigger 7 is shortened due to the contraction of the hydraulic cylinder, so that the rear wheel group 9 of the outrigger is supported on the surface of the precast beam 10, and the lower part of the rear folding telescopic outrigger is folded to both sides so as to pass through the precast beam 10. The bridge erecting machine continues to move longitudinally backward so that the front wheel group of the outrigger is also supported on the surface of the precast beam 10. Figure 3 As shown;

[0062] (4) When the front wheel group 8 of the outrigger moves to the rear end surface of the prefabricated beam 10, the lower part of the rear folding telescopic outrigger flips back to the initial position and is extended due to the action of the hydraulic cylinder, so that the rear folding telescopic outrigger 7 supports the entire bridge erecting machine again. Figure 4 As shown;

[0063] (5) At this time, the front crane 2 and the rear crane 3 move to the top of the precast beam 10, and the precast beam 10 is lifted off the ground by the lifting device. Figure 5 As shown;

[0064] (6) The bridge erection machine moves forward with the prefabricated beam 10. When the front folding telescopic support 6 moves to the edge of the erected bridge, the rear telescopic support leg 5 is extended by the hydraulic cylinder and the front folding telescopic support leg 6 is shortened and flipped outward to a horizontal position. Figure 6 As shown;

[0065] (7) With the rear telescopic legs 5 as the fulcrum, the bridge erecting machine with the precast beam 10 continues to move under the movement of the rear folding telescopic legs 7. Figure 7 As shown;

[0066] (8) When the front telescopic leg 4 of the previous bridge erecting machine moves to the front end of the next bridge pier 11, the front telescopic leg 4 is extended by the action of the hydraulic cylinder so as to be supported on the bridge pier 11. Figure 8 As shown;

[0067] (9) The rear telescopic legs 5 are shortened by the hydraulic cylinder and move along the track under the main beam 1 to coincide with the front telescopic legs 4. At this time, the front precast beam 10 is driven by the front crane 2 and the rear crane 3 to move to the position where the bridge is to be erected. Fig. 9 As shown;

[0068] (10) The front crane 2 and the rear crane 3 lower the precast beam 10 to complete the beam lowering. Fig.10 As shown;

[0069] (11) The front telescopic legs 4 are shortened, the front folding telescopic legs 6 are folded back to their original positions and extended to support the entire bridge erecting machine again and move backwards to the erected beam surface, ready to get off the machine for erection work. Fig.11 shown.

[0070] The matters not described in the present invention are applicable to the prior art

[0071] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A high-efficiency single-beam bridge erecting machine, characterized in that: It includes a main beam, a front lifting crane, a rear lifting crane, a front telescopic outrigger, a rear telescopic outrigger, a front folding telescopic outrigger, a rear folding telescopic outrigger, an outrigger front wheel set and an outrigger rear wheel set; Side guide rails are arranged on both sides of the main beam, and a pair of front hoisting cranes and a pair of rear hoisting cranes are respectively matched with the side guide rails on both sides of the main beam for sliding support, and the front hoisting crane and the rear hoisting crane on the same side are connected to the corresponding first synchronous belts by bolts, and the first synchronous belts on both sides are supported on the synchronous wheels at both ends of each, and the synchronous wheel at one end is connected to the first motor installed inside the front end of the main beam through the wheel shaft, so as to transport the prefabricated beam to between the two piers; The front telescopic leg is composed of an upper part of the front telescopic leg and a lower part of the front telescopic leg. The upper part of the front telescopic leg is vertically fixedly connected to the lower end of the front part of the main beam. A hydraulic cylinder is also connected between the lower part of the front telescopic leg and the upper part of the front telescopic leg to realize the vertical movement and fixation of the lower part of the front telescopic leg in the upper part of the front telescopic leg. The rear telescopic leg is composed of an upper part of the rear telescopic leg and a lower part of the rear telescopic leg. The upper part of the rear telescopic leg forms a sliding support with the bottom track fixed at the lower end of the front part of the main beam along the longitudinal direction. A hydraulic cylinder is connected between the lower part of the rear telescopic leg and the upper part of the rear telescopic leg to realize the vertical movement and fixation of the lower part of the rear telescopic leg in the upper part of the rear telescopic leg. The upper part of the rear telescopic leg is connected to a second synchronous belt, and the second synchronous belt is connected to the second motor drive through a corresponding synchronous wheel. Two groups of front folding telescopic legs are respectively installed on both sides of the front part of the main beam and aligned left and right; each group of front folding telescopic legs consists of an upper part of the front folding telescopic leg and a lower part of the front folding telescopic leg; the upper part of the front folding telescopic leg is fixedly connected to the outside of the front side of the main beam, and the upper end of the lower part of the front folding telescopic leg is connected to the upper part of the front folding telescopic leg through a hinge shaft, and the two are connected through a hydraulic cylinder; the lower part of the front folding telescopic leg adopts a telescopic leg structure, and two front and rear running wheels are installed at the lower end of the lower part of the front folding telescopic leg, and at least one of the two running wheels is connected to the third motor drive; The two sets of rear folding telescopic legs are the same as the two front folding support structures, and the two sets of rear folding telescopic legs are installed at the outer positions on both sides of the rear of the main beam; The front wheel group of the outrigger and the rear wheel group of the outrigger are installed at the rear part of the main beam and are respectively located at the front side and the rear side of the rear folding telescopic outrigger.

2. The high-efficiency single-beam bridge erecting machine according to claim 1 is characterized in that: The front telescopic outriggers are in the form of U-shaped outriggers as a whole.

3. A method for using the high-efficiency single-beam bridge erection machine as claimed in claim 1 or 2, for erecting a prefabricated pipeline bridge, characterized in that: The following steps are involved: Step 1: Place the bridge erecting machine on the erected beam surface through the front telescopic folding legs and the rear telescopic folding legs, and transport the prefabricated beam to be erected to the rear of the bridge erecting machine by a beam transport vehicle or a crane to form an initial working state; Step 2: Start the bridge erecting machine, and move it backwards by folding the front telescopic legs and the rear telescopic legs, until the rear telescopic legs reach the vicinity of the front end of the precast beam and the rear wheel group of the legs reaches the front end surface of the precast beam; Step 3: The rear folding telescopic outrigger is contracted and shortened by a hydraulic cylinder, and the lower part of the rear folding telescopic outrigger is turned outward to a horizontal position, and the rear wheel group of the outrigger is supported on the surface of the prefabricated beam, and the front wheel group of the outrigger is also supported on the surface of the prefabricated beam as the bridge erecting machine continues to move longitudinally backward; Step 4: When the front wheel group of the outrigger moves to the rear end surface of the prefabricated beam, the lower part of the rear folding telescopic outrigger flips back to the initial position and extends, contacts the erected beam surface, and re-supports the entire bridge erecting machine; Step 5: When the bridge erecting machine moves to a point where both the pair of front cranes and the pair of rear cranes are located above the prefabricated beams, the prefabricated beams are lifted off the ground by means of the slings connected to the cranes; Step 6: The bridge erecting machine moves in reverse direction and moves forward with the prefabricated beam. When the front folding telescopic bracket moves to the edge of the erected bridge, the rear telescopic leg is extended to contact the front end of the erected beam. At the same time, the lower part of the front folding telescopic leg is retracted and shortened, and flipped outward to a horizontal position. Step 7: Using the rear telescopic legs as a fulcrum, the bridge erecting machine and the prefabricated beam continue to move forward under the movement of the rear folding telescopic legs; Step 8: When the front telescopic legs of the bridge erecting machine move to the front end of the next pier to be erected, the front telescopic legs extend to a position in contact with the upper end of the pier; Step 9: The rear telescopic legs are retracted and shortened, and move along the bottom track at the lower end of the main beam to a position that coincides with the front telescopic legs; at the same time, the precast beam is driven by the front crane and the rear crane to move to the position where the bridge is to be erected; Step 10: The front crane and the rear crane lower the prefabricated beam to complete the beam lowering; Step 11. The front telescopic legs are retracted and shortened. At the same time, the front folding telescopic legs are flipped back to their original positions and extended to a position in contact with the newly erected beam surface. The entire bridge-erecting machine is re-supported and moved backward to the already erected beam surface, preparing for the erection of the next section of prefabricated beams.

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