Single-beam bridge erecting machine and method for erecting, crossing a hole and crossing a tunnel

Abstract

The application discloses a single-beam bridge girder erection machine and a method for erecting a girder, passing through a hole and passing through a tunnel. The single-beam bridge girder erection machine comprises a two-span main girder, a front hoisting trolley, a rear hoisting trolley, a main supporting leg, a middle supporting leg, a rear folding supporting leg, a rear wheel group supporting leg and a rear walking supporting leg. The two-span main girder adopts a single-box structure and is arranged in two spans in the bridge construction direction. A track is arranged at the lower part of the front span of the two-span main girder to support the longitudinal movement of the main supporting leg. The middle part of the two-span main girder is provided with flanges connected with the middle supporting leg. The tail part of the two-span main girder is provided with flanges connected with the rear wheel group supporting leg and the rear walking supporting leg respectively. The tail part of the two-span main girder is connected with the rear folding supporting leg through a hinge shaft. The rear span fixed-point-position web of the two-span main girder is provided with a hole to support the front hoisting trolley and the rear hoisting trolley. The single-beam bridge girder erection machine can reduce the height and is beneficial to passing through a tunnel.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction equipment and bridge erection machines, and in particular to a single-beam bridge erection machine and methods for erecting beams, passing through holes, and passing through tunnels thereof. Background Art

[0002] A bridge-erecting machine is a device used to place prefabricated beams onto prefabricated bridge piers. It falls under the category of cranes, as its primary function is to lift beams, transport them to their location, and then lower them. However, a bridge-erecting machine differs significantly from a typical crane. It operates under demanding conditions and requires the machine to move vertically along the beams. There are several types of bridge-erecting machines, including those used for highway bridges, conventional railway bridges, and passenger-dedicated railway bridges.

[0003] It is very common to use bridge-building machines to erect highway and railway bridges. The bridge-building machines currently used at home and abroad, when erecting simply supported beams, the front and rear beam-hoisting trolleys cooperate with the beam to move longitudinally between the two abutments.

[0004] In the existing technology, some bridge-building machines use larger O-shaped legs, while others use integrated transport and erection machines. Although they can complete beam erection construction, the O-shaped legs cannot complete the beam erection work at the tunnel entrance, and the integrated transport and erection machines have high fuel consumption, low efficiency, and high pressure on the beam surface. Summary of the Invention

[0005] Multiple aspects of the present application provide a single-beam bridge-erecting machine and methods for erecting beams, passing through holes, and passing through tunnels, which can reduce the height and facilitate passing through tunnels. This bridge-erecting machine fully utilizes the concave beam transport vehicle's load-bearing structure as a beam-shifting track, which better disperses the pressure on the erected beam surface. At the same time, it adopts a single-beam design without a large O-leg structure in the rear structure form, has the characteristics of light weight, and greatly improves work efficiency.

[0006] The first aspect of the present application provides a single-beam bridge erecting machine, comprising: a two-span main beam, a front hoisting trolley, a rear hoisting trolley, a main outrigger, a middle outrigger, a rear folding outrigger, a rear wheel group outrigger and a rear walking outrigger, wherein:

[0007] The two-span main beam adopts a single-box structure, which meets the two-span arrangement along the construction direction of the bridge. A track is set at the lower part of the front span of the two-span main beam to support the longitudinal movement of the main support legs. A flange is set at the middle part of the two-span main beam to be connected with the middle support legs. A flange is set at the tail part of the two-span main beam to be connected with the rear wheel group support legs and the rear walking support legs respectively. The tail part of the two-span main beam is connected to the rear folding leg hinge shaft. The web plate of the fixed position of the rear span of the two-span main beam is hollowed to support the front lifting crane and the rear lifting crane.

[0008] Optionally, the upper crossbeams of the front lifting trolley and the rear lifting trolley are supported to fixed positions of the two-span main beam, and a longitudinal movement system and a transverse movement system are provided on the crossbeams. The wire rope of the front lifting trolley is wound in a one-point lifting form, and the wire rope of the rear lifting trolley is wound in a two-point lifting form.

[0009] Optionally, the main support leg is an inverted triangle structure composed of a main load-bearing leg and a diagonal support leg. The upper part of the main support leg is a supporting wheel device, which supports the two-span main beam. The inverted walking system enables the main support leg to walk under the two-span main beam. A folding mechanism is provided in the middle part of the main support leg to lower the height of the support leg. The lower part is a telescopic sleeve structure, which supports the bridge pier.

[0010] Optionally, the lower part of the middle support leg is supported by a lifting cylinder extending outward to the already erected beam surface.

[0011] Optionally, the upper hinge seat of the rear folding leg is connected to the hinge shaft of the two-span main beam, and the lower part of the rear folding leg is supported by a lifting cylinder on the already erected beam surface, and the rear folding leg lowers the leg height through the hinge shaft.

[0012] Optionally, the upper flange of the rear wheel group support leg is connected to the two-span main beam, and the lower part of the rear wheel group support leg is supported by the wheel group mechanism to the concrete beam surface carried by the concave beam transport vehicle.

[0013] Optionally, the upper flange of the rear walking leg is connected to the two-span main beam, and the lower part of the rear walking leg is supported by a wheel group mechanism to the track of the load-bearing beam of the concave beam transport vehicle to achieve longitudinal movement.

[0014] A second aspect of the present application provides a beam erecting method using a single-beam bridge erecting machine, wherein the beam erecting method is performed using the single-beam bridge erecting machine described above. The beam erecting method comprises:

[0015] Step 201: The single-beam bridge erecting machine is in the beam erecting station state, the main legs are supported on the front span pier support, the middle legs are supported on the front end of the erected concrete beam; the rear folding legs are supported on the concrete beam surface in a vertical state; the rear walking legs are converted to a horizontal folding state by a folding cylinder; the concave beam transport vehicle carries the concrete beam to the rear side of the rear folding legs;

[0016] Step 202: The concave beam transport vehicle is raised so that the rear wheel support legs are supported on the surface of the transported concrete beam; the rear folding legs are converted to a horizontal retracted state by a folding cylinder; the concave beam transport vehicle actively moves forward with the beam on its back until the rear wheel support legs move to the tail of the concrete beam;

[0017] Step 203: The rear outrigger is converted to a vertical state by a folding cylinder, and the telescopic sleeve is released, so that the rear outrigger is supported on the load-bearing beam of the concave beam transport vehicle; the concave beam transport vehicle carrying the beam continues to move forward to the corresponding concrete lifting points of the front crane and the rear crane; the lower cylinder of the middle outrigger is retracted and separated from the beam surface;

[0018] In step 204, the front and rear overhead cranes simultaneously lower the slings to connect with the corresponding lifting points of the concrete beam; the front and rear overhead cranes simultaneously lift the concrete beam and detach it from the concave beam transport vehicle; the lower wheel assembly of the rear traveling legs travels on the concave beam transport vehicle, and is linked with the upper traveling mechanism of the main legs, and the two-span main beam with the suspended concrete beam moves forward longitudinally; the concrete beam moves forward longitudinally to the beam drop position;

[0019] Step 205: The front crane and the rear crane simultaneously lower the sling to drop the concrete beam onto the bridge pier; the front crane and the rear crane are disconnected from the concrete beam and the sling is raised;

[0020] Step 206: The lower wheel assembly of the rear traveling leg travels on the concave beam transport vehicle and is linked with the upper traveling mechanism of the main legs. The two-span main beam moves longitudinally backward, so that the middle legs support the end of the already erected concrete beam.

[0021] In step 207, the lifting cylinder at the bottom of the main leg retracts to separate the main leg from the pier; the reverse-hook walking system at the top of the main leg drives the main leg to move longitudinally forward to support the next pier; the concave beam transport vehicle moves longitudinally backward to make room for the rear folding leg; the rear folding leg is converted to a vertical position by the folding cylinder and supported on the concrete beam surface;

[0022] Step 208: the beam transport vehicle is lowered to separate the rear walking legs from the concave beam transport vehicle, and the rear walking legs are converted to a horizontal folded state by a folding cylinder, ready for the next beam erection.

[0023] A third aspect of the present application provides a method for erecting a final hole using a single-beam bridge erection machine, wherein the final hole is erected using the single-beam bridge erection machine described above. The method for erecting the final hole comprises:

[0024] Step 301: The front crane and the rear crane complete the concrete beam drop, and the sling is separated from the beam. The lower wheel assembly of the rear traveling leg travels on the concave beam transport vehicle, and is linked with the upper traveling mechanism of the main legs. The two-span main beam moves longitudinally backward, so that the middle legs support the end of the already erected concrete beam.

[0025] In step 302, the lower lifting cylinder of the main leg is retracted to separate the main leg from the pier; the middle folding mechanism of the main leg is activated to lower the overall height of the main leg to meet the beam surface support requirements; the upper reverse hanging walking system of the main leg drives the main leg to move longitudinally forward to the next beam surface support;

[0026] Step 303: The concave beam transport vehicle moves longitudinally backward to make room for the rear folding legs; the rear folding legs are converted to a vertical state by a folding cylinder and supported on the concrete beam surface;

[0027] Step 304: the beam transport vehicle is lowered so that the rear walking legs are separated from the concave beam transport vehicle, and the rear walking legs are converted to a horizontally stowed state by a folding cylinder;

[0028] Step 305: Complete the installation of the last-hole beam according to the bridge-erecting machine beam-through-hole process.

[0029] A fourth aspect of the present application provides a method for a single-girder bridge erecting machine to pass through a tunnel, wherein the single-girder bridge erecting machine described above is used to pass through the tunnel, and the method for passing through the tunnel comprises:

[0030] Step 401: Before entering the tunnel, the lifting cylinders at the lower portions of the middle legs and the rear folding legs are retracted to lower the two-span main beam to the lowest height; the main legs are in a folded state, supported on the beam surface;

[0031] Step 402: The telescopic sleeve at the bottom of the rear walking leg is extended, and the rear walking leg is supported on the beam surface; the lifting cylinders at the bottom of the middle leg and the rear folding leg are retracted, so that the middle leg and the rear folding leg are separated from the beam surface;

[0032] Step 403: The driving trolley at the lower portion of the rear walking leg drives the main beam to move longitudinally, so that the middle leg reaches the rear of the main leg;

[0033] In step 404, the lifting cylinder at the bottom of the middle leg is extended to support the beam surface; the main leg is lifted off the ground, and the reverse hanging walking system at the top of the main leg drives the main leg to move longitudinally to the front end of the two-span main beam;

[0034] Step 405: Repeat the process from step 402 to step 404 to complete the tunnel passing.

[0035] The single-beam bridge-erecting machine and its method of erecting beams, passing through holes and tunnels described above can reduce the height to facilitate passing through tunnels. This bridge-erecting machine fully utilizes the concave beam transport vehicle's load-bearing structure as a beam-moving track, which better disperses the pressure on the erected beam surface. At the same time, it adopts a single-beam design without a larger O-leg structure in the rear structure form, and has the characteristics of light weight, which greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of a single-beam bridge erection machine according to an embodiment of the present application.

[0037] Figure 2-9 Another embodiment of this application Figure 1 State diagram of each stage of the beam erection and through-hole method of the single-girder bridge erection machine.

[0038] Figure 10-14 Another embodiment of this application Figure 1 A state diagram of each stage of the method for erecting the final hole of the single-girder bridge erecting machine.

[0039] Figure 15-19 Another embodiment of this application Figure 1 State diagram of the single-girder bridge erecting machine at various stages of its tunneling method. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship. Furthermore, the terms "system" and "network" are often used interchangeably in this document.

[0042] like Figure 1 FIG2 is a schematic diagram of the structure of a single-girder bridge erecting machine according to one embodiment of the present application. As shown in the figure, the single-girder bridge erecting machine includes: a two-span main beam 1, a front hoisting trolley 2, a rear hoisting trolley 3, a main support leg 4, a middle support leg 5, a rear folding support leg 6, a rear wheel support leg 7, and a rear walking support leg 8. In another embodiment of the present application, the single-girder bridge erecting machine further includes an electro-hydraulic system for driving the operation of the single-girder bridge erecting machine.

[0043] The two-span main beam 1 adopts a single-box structure, which meets the two-span arrangement along the bridge construction direction. A track is set at the lower part of the front span of the two-span main beam 1 to support the longitudinal movement of the main support leg 4. A flange is set at the middle part of the two-span main beam 1 to be connected to the middle support leg 5 (for example, rigidly connected). A flange is set at the tail part of the two-span main beam 1 to be connected to the rear wheel group support leg 7 and the rear walking support leg 8 respectively (for example, rigidly connected). The tail part of the two-span main beam 1 is hingedly connected to the rear folding support leg 6. The web of the fixed position of the rear span of the two-span main beam 1 is hollowed to support the front lifting trolley 2 and the rear lifting trolley 3.

[0044] The upper crossbeams of the front hoisting trolley 2 and the rear hoisting trolley 3 are supported to fixed positions of the two-span main beam 1. A longitudinal movement system (not shown) and a transverse movement system (not shown) are provided on the crossbeams. The wire rope of the front hoisting trolley 2 is wound in a one-point lifting form, and the wire rope of the rear hoisting trolley 3 is wound in a two-point lifting form.

[0045] The main support leg 4 is an inverted triangle structure composed of a main load-bearing leg and an oblique support leg, that is, the main load-bearing leg can be supported on the bridge pier and is basically perpendicular to the two-span main beam 1. The oblique support leg and the main load-bearing leg are combined together at the bridge pier, but the oblique support leg and the main load-bearing leg respectively support two positions of the two-span main beam 1. The upper part of the main support leg 4 is a supporting wheel device, which can support the two-span main beam 1. The inverted walking system can make the main support leg 4 walk on the lower part of the two-span main beam 1. A folding mechanism is set in the middle part of the main support leg 4 to reduce the height of the support leg. The lower part is a telescopic sleeve structure, which is supported on the bridge pier.

[0046] The lower part of the middle support leg 5 is supported by a lifting cylinder extending to the already erected beam surface.

[0047] The upper hinge seat of the rear folding leg 6 is connected to the hinge shaft of the two-span main beam 1, and the lower part of the rear folding leg 6 is supported by a lifting cylinder on the already erected beam surface. The rear folding leg 6 can lower the leg height through the hinge shaft.

[0048] The upper flange of the rear wheel support leg 7 is connected to the two-span main beam 1, and the lower part of the rear wheel support leg 7 is supported by the wheel group mechanism to the concrete beam surface carried by the concave beam transport vehicle.

[0049] The upper flange of the rear walking leg 8 is connected to the two-span main beam 1, and the lower part of the rear walking leg 8 is supported by a wheel group mechanism on the track of the load-bearing beam of the concave beam transport vehicle and can move longitudinally.

[0050] The single-beam bridge erecting machine described above can reduce the height of the legs due to the folding mechanism of the main legs and the rear folding legs, and is beneficial to passing through a tunnel. In addition, the single-beam bridge erecting machine makes full use of the load-bearing structure of the concave beam carrying vehicle as a beam moving track, and better disperses the pressure on the erected beam surface. Meanwhile, the single-beam design is adopted, and the O-shaped leg structure with a large rear structure form is not used, so that the single-beam bridge erecting machine has the characteristics of light weight and greatly improved work efficiency.

[0051] As shown in Figure 2-9 , the single-beam bridge erecting machine is in a beam erecting station state, the main legs 4 are supported to the front cross bridge pier support, the middle legs 5 are supported to the front end of the concrete beam which has been erected, the rear folding legs 6 are in a vertical state and are supported to the concrete beam surface, the rear walking legs 8 are converted to a horizontal storage state by the folding oil cylinder, and the concave beam carrying vehicle carries the concrete beam to the rear side of the rear folding legs 6. Figure 1 The state diagram of each stage of the beam erecting and hole passing method of the single-beam bridge erecting machine can be as follows.

[0052] As shown in Figure 2 , the single-beam bridge erecting machine is in a beam erecting station state, the main legs 4 are supported to the front cross bridge pier support, the middle legs 5 are supported to the front end of the concrete beam which has been erected, the rear folding legs 6 are in a vertical state and are supported to the concrete beam surface, the rear walking legs 8 are converted to a horizontal storage state by the folding oil cylinder, and the concave beam carrying vehicle carries the concrete beam to the rear side of the rear folding legs 6.

[0053] As shown in Figure 3 , the single-beam bridge erecting machine is in a beam erecting station state, the main legs 4 are supported to the front cross bridge pier support, the middle legs 5 are supported to the front end of the concrete beam which has been erected, the rear folding legs 6 are in a vertical state and are supported to the concrete beam surface, the rear walking legs 8 are converted to a horizontal storage state by the folding oil cylinder, and the concave beam carrying vehicle carries the concrete beam to the rear side of the rear folding legs 6.

[0054] As shown in Figure 4 , the single-beam bridge erecting machine is in a beam erecting station state, the main legs 4 are supported to the front cross bridge pier support, the middle legs 5 are supported to the front end of the concrete beam which has been erected, the rear folding legs 6 are in a vertical state and are supported to the concrete beam surface, the rear walking legs 8 are converted to a horizontal storage state by the folding oil cylinder, and the concave beam carrying vehicle carries the concrete beam to the rear side of the rear folding legs 6.

[0055] As shown in Figure 5 , the single-beam bridge erecting machine is in a beam erecting station state, the main legs 4 are supported to the front cross bridge pier support, the middle legs 5 are supported to the front end of the concrete beam which has been erected, the rear folding legs 6 are in a vertical state and are supported to the concrete beam surface, the rear walking legs 8 are converted to a horizontal storage state by the folding oil cylinder, and the concave beam carrying vehicle carries the concrete beam to the rear side of the rear folding legs 6.

[0056] As shown in Figure 6As shown, the front crane 2 and the rear crane 3 simultaneously lower the sling to drop the concrete beam onto the bridge pier; the front crane 2 and the rear crane 3 release the connection with the concrete beam and raise the sling.

[0057] Step 206, as Figure 7 As shown, the lower wheel group of the rear walking leg 8 runs on the concave beam transport vehicle and is linked with the upper walking mechanism of the main leg 4. The two-span main beam 1 moves longitudinally backward, so that the middle leg 5 supports the end of the concrete beam that has been erected.

[0058] Step 207, as Figure 8 As shown, the lower lifting cylinder of the main leg 4 is retracted to separate the main leg 4 from the pier; the upper reverse-hanging walking system of the main leg 4 drives the main leg 4 to move forward longitudinally to the next pier support; the concave beam transporter moves backward longitudinally to make room for the rear folding leg 6; the rear folding leg 6 is converted to a vertical state by the folding cylinder and supported on the concrete beam surface.

[0059] Step 208, as Figure 9 As shown, the beam transport vehicle is lowered so that the rear walking legs 8 are separated from the concave beam transport vehicle, and the rear walking legs 8 are converted to a horizontal retracted state by a folding cylinder; the concave beam transport vehicle returns to the beam factory to pick up the beams and prepare for the next beam erection.

[0060] like Figure 10-14 , which is another embodiment of the present application Figure 1 The state diagram of each stage of the method for erecting the last hole of the single-beam bridge erecting machine, the process of erecting the last hole of the bridge erecting machine can be described as follows.

[0061] Step 301, as Figure 10 As shown, the front hoisting trolley 2 and the rear hoisting trolley 3 complete the lowering of the concrete beam, and the hoist is separated from the beam body; the lower wheel group of the rear walking leg 8 runs on the concave beam transport vehicle, and is linked with the upper walking mechanism of the main leg 4, and the two-span main beam 1 moves longitudinally backward, so that the middle leg 5 supports the end of the concrete beam that has been erected.

[0062] Step 302, as Figure 11 As shown, the lower lifting cylinder of the main leg 4 retracts to separate the main leg 4 from the pier; the middle folding mechanism of the main leg 4 works to lower the overall height of the main leg 4 to meet the beam surface support; the upper reverse hanging walking system of the main leg 4 drives the main leg 4 to move forward longitudinally to the next beam surface support.

[0063] Step 303, as Figure 12 As shown, the concave beam transport vehicle moves longitudinally backward to make room for the rear folding legs 6; the rear folding legs 6 are converted to a vertical state by a folding cylinder and supported on the concrete beam surface.

[0064] Step 304, as Figure 13 As shown, the beam transport vehicle is lowered to separate the rear walking legs 8 from the concave beam transport vehicle, and the rear walking legs 8 are converted into a horizontal retracted state by a folding cylinder; the concave beam transport vehicle returns to the beam factory to pick up the beams.

[0065] Step 305, as Figure 14 As shown, the erection of the last hole beam is completed according to the bridge erection machine beam through-hole process.

[0066] like Figure 15-19 , which is another embodiment of the present application Figure 1 The state diagram of each stage of the single-girder bridge erecting machine's method of passing through a tunnel, and the process of the bridge erecting machine passing through a tunnel can be described as follows.

[0067] Step 401, as Figure 15 As shown, before entering the tunnel, the lifting cylinders at the lower parts of the middle support legs 5 and the rear folding support legs 6 are retracted to lower the two-span main beam 1 to the lowest height; the main support legs 4 are in a folded state and supported on the beam surface.

[0068] Step 402, as Figure 16 As shown, the telescopic sleeve at the bottom of the rear walking leg 8 is extended, and the rear walking leg 8 is supported on the beam surface; the lifting cylinders at the bottom of the middle leg 5 and the rear folding leg 6 are retracted, so that the middle leg 5 and the rear folding leg 6 are separated from the beam surface.

[0069] Step 403, as Figure 17 As shown, the driving trolley at the lower part of the rear walking leg 8 drives the main beam to move longitudinally, so that the middle leg 5 reaches the rear of the main leg 4.

[0070] Step 404, as Figure 18 As shown, the lifting cylinder at the bottom of the middle support leg 5 is extended to support the beam surface; the main support leg 4 is separated from the ground, and the reverse hanging walking system at the top of the main support leg 4 drives the main support leg 4 to move longitudinally to the front end of the two-span main beam 1.

[0071] Step 405, as Figure 19 As shown, the operation process from step 402 to step 404 is repeated to complete the tunnel passing by itself.

[0072] In the process of the single-girder bridge erecting machine passing through a tunnel described above, since the main legs and the rear folding legs have a folding mechanism, the height of the legs can be lowered, which is conducive to passing through the tunnel.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A single-beam bridge erecting machine, characterized in that: include: A two-span main beam (1), a front crane (2), a rear crane (3), a main support leg (4), a middle support leg (5), a rear folding support leg (6), a rear wheel support leg (7) and a rear walking support leg (8), wherein: The two-span main beam (1) adopts a single-box structure, which satisfies the two-span arrangement along the construction direction of the bridge. A track is provided at the lower part of the front span of the two-span main beam (1) to support the longitudinal movement of the main support leg (4). A flange is provided at the middle part of the two-span main beam (1) to connect with the middle support leg (5). A flange is provided at the rear part of the two-span main beam (1) to connect with the rear wheel group support leg (7) and the rear walking support leg (8) respectively. The rear part of the two-span main beam (1) is hingedly connected to the rear folding support leg (6). The web of the fixed point position of the rear span of the two-span main beam (1) is bored to support the front crane (2) and the rear crane (3). , wherein the upper flange of the rear wheel group support leg (7) is connected to the two-span main beam (1), the lower part of the rear wheel group support leg (7) is a wheel group mechanism supported on the concrete beam surface carried by the concave beam transport vehicle, the upper flange of the rear walking support leg (8) is connected to the two-span main beam (1), the lower part of the rear walking support leg (8) is a wheel group mechanism, and the rear walking support leg (8) can be converted between a horizontal retracted state and a vertical state by a folding cylinder. When the rear walking support leg (8) is converted to a vertical state, the telescopic sleeve is released, so that the rear walking support leg (8) can be supported on the track on the load-bearing beam of the concave beam transport vehicle to achieve longitudinal movement.

2. The single-girder bridge erecting machine according to claim 1, characterized in that: The upper crossbeams of the front hoisting trolley (2) and the rear hoisting trolley (3) are supported at fixed positions of the two-span main beam (1), and a longitudinal movement system and a transverse movement system are arranged on the crossbeams. The steel wire rope of the front hoisting trolley (2) is wound in a one-point hanging form, and the steel wire rope of the rear hoisting trolley (3) is wound in a two-point hanging form.

3. The single-girder bridge erecting machine according to claim 1, characterized in that: The main supporting leg (4) is an inverted triangle structure composed of a main load-bearing leg and an oblique supporting leg. The upper part of the main supporting leg (4) is a supporting wheel device that supports the two-span main beam (1). The reverse hanging walking system enables the main supporting leg (4) to walk on the lower part of the two-span main beam (1). The middle part of the main supporting leg (4) is provided with a folding mechanism to reduce the height of the supporting leg. The lower part is a telescopic sleeve structure that supports the bridge pier.

4. The single-girder bridge erecting machine according to claim 1, characterized in that: The lower part of the middle support leg (5) is supported by a lifting cylinder extending outward to the already erected beam surface.

5. The single-girder bridge erecting machine according to claim 1, characterized in that: The upper hinge seat of the rear folding support leg (6) is connected to the hinge shaft of the two-span main beam (1), and the lower part of the rear folding support leg (6) is supported by a lifting cylinder on the already erected beam surface, and the rear folding support leg (6) lowers the support leg height through the hinge shaft.

6. A method for erecting a single-beam bridge erecting machine, characterized in that: The single-beam bridge erecting machine according to any one of claims 1 to 5 is used to erect beams, and the beam erecting method includes: Step 201, the single-beam bridge erection machine is in a beam erection station state, the main support leg (4) is supported on the front span pier support, the middle support leg (5) is supported on the front end of the concrete beam that has been erected; the rear folding support leg (6) is supported on the concrete beam surface in a vertical state; the rear walking support leg (8) is converted to a horizontal folding state by a folding oil cylinder; the concave beam transport vehicle carries the concrete beam to the rear side of the rear folding support leg (6); Step 202: the concave beam transport vehicle is raised so that the rear wheel support legs (7) are supported on the surface of the transported concrete beam; the rear folding support legs (6) are converted to a horizontal folding state by a folding oil cylinder; the concave beam transport vehicle actively moves forward with the beam on its back until the rear wheel support legs (7) move to the tail of the concrete beam; In step 203, the rear walking legs (8) are converted to a vertical state by using a folding oil cylinder, and the telescopic sleeve is released, so that the rear walking legs are supported on the load-bearing beam of the concave beam transport vehicle; the concave beam transport vehicle carries the beam and continues to move forward to the concrete lifting points corresponding to the front hoisting trolley (2) and the rear hoisting trolley (3); the lower oil cylinder of the middle leg (5) is retracted and separated from the beam surface; In step 204, the front hoisting trolley (2) and the rear hoisting trolley (3) simultaneously lower the slings to connect with the corresponding lifting points of the concrete beam; the front hoisting trolley (2) and the rear hoisting trolley (3) simultaneously lift the concrete beam and detach it from the concave beam transport vehicle; the lower wheel set of the rear walking legs (8) travels on the concave beam transport vehicle and is linked with the upper walking mechanism of the main legs (4), and the two-span main beam (1) hanging the concrete beam moves forward longitudinally; the concrete beam moves forward longitudinally to the beam drop position; In step 205, the front hoisting trolley (2) and the rear hoisting trolley (3) simultaneously lower the sling to allow the concrete beam to fall onto the bridge pier; the front hoisting trolley (2) and the rear hoisting trolley (3) are disconnected from the concrete beam and the sling is raised; Step 206: the lower wheel group of the rear walking leg (8) moves on the concave beam transport vehicle and is linked with the upper walking mechanism of the main leg (4), and the two-span main beam (1) moves longitudinally backward, so that the middle leg (5) supports the end of the concrete beam that has been erected; In step 207, the lower lifting cylinder of the main leg (4) is retracted to separate the main leg (4) from the bridge pier; the upper reverse hanging walking system of the main leg (4) drives the main leg (4) to move forward longitudinally to the next bridge pier support; the concave beam transport vehicle moves backward longitudinally to make room for the rear folding leg (6); the rear folding leg (6) is converted to a vertical state by the folding cylinder and supported on the concrete beam surface; Step 208, the beam transport vehicle is lowered to separate the rear walking legs (8) from the concave beam transport vehicle, and the rear walking legs (8) are converted to a horizontal folded state using a folding oil cylinder to prepare for the next beam erection.

7. A method for erecting the final hole of a single-beam bridge erection machine, characterized in that: The single-beam bridge erecting machine according to any one of claims 1 to 5 is used to erect the final hole, and the method of erecting the final hole comprises: In step 301, the front hoisting trolley (2) and the rear hoisting trolley (3) complete the concrete beam drop, and the sling is separated from the beam body; the lower wheel group of the rear walking leg (8) walks on the concave beam transport vehicle, and is linked with the upper walking mechanism of the main leg (4), and the two-span main beam (1) moves longitudinally backward, so that the middle leg (5) supports the end of the concrete beam that has been erected; In step 302, the lower lifting cylinder of the main leg (4) is retracted to separate the main leg (4) from the bridge pier; the middle folding mechanism of the main leg (4) is operated to lower the overall height of the main leg (4) to meet the beam surface support; the upper reverse hanging walking system of the main leg (4) drives the main leg (4) to move forward longitudinally to the next beam surface support; Step 303, the concave beam transport vehicle moves longitudinally backward to make room for the rear folding legs (6); the rear folding legs (6) are converted to a vertical state by a folding oil cylinder and supported on the concrete beam surface; Step 304, the beam transport vehicle is lowered so that the rear walking legs (8) are separated from the concave beam transport vehicle, and the rear walking legs (8) are converted into a horizontal folding state by using a folding cylinder; Step 305: Complete the installation of the last-hole beam according to the bridge-erecting machine beam-through-hole process.

8. A method for a single-beam bridge erection machine to pass through a tunnel, characterized in that: The single-girder bridge erecting machine according to any one of claims 1 to 5 is used to pass through a tunnel, and the method of passing through the tunnel comprises: Step 401: before entering the tunnel, the lifting cylinders at the lower parts of the middle support leg (5) and the rear folding support leg (6) are retracted to lower the two-span main beam (1) to the lowest height; the main support leg (4) is in a folded state and supported on the beam surface; In step 402, the telescopic sleeve at the bottom of the rear walking leg (8) is extended, and the rear walking leg (8) is supported on the beam surface; the lifting cylinders at the bottom of the middle leg (5) and the rear folding leg (6) are retracted, so that the middle leg (5) and the rear folding leg (6) are separated from the beam surface; Step 403: The driving trolley at the lower portion of the rear walking leg (8) drives the main beam to move longitudinally, so that the middle leg (5) reaches the rear portion of the main leg (4); In step 404, the lifting cylinder at the lower portion of the middle support leg (5) is extended to support the beam surface; the main support leg (4) is lifted off the ground, and the reverse hanging walking system at the upper portion of the main support leg (4) drives the main support leg (4) to move longitudinally to the front end of the two-span main beam (1); Step 405: Repeat the process from step 402 to step 404 to complete the tunnel passing.

Images