Road bridge girder erection machine tunnel portal installation method

Abstract

The invention discloses a highway bridge girder erection machine tunnel portal installation method. The method comprises the steps that round girders of middle supporting legs are placed on the edge of a tunnel portal abutment; assembling a main beam on the roadbed at the other end of the tunnel and hoisting the main beam to a beam transporting vehicle; a riding wheel group of a middle supporting leg is mounted at the lower end of the main beam; conveying the main beam from the other end of the tunnel to a round girder of a middle supporting leg at a tunnel portal, and connecting a riding wheel group of the middle supporting leg with the round girder in a matching manner; a temporary support for supporting the rear end of the main beam is installed in the tunnel, and the main beam is unloaded from the beam transporting vehicle; temporary rear supporting legs for supporting the rear ends of the main beams are installed in the tunnel; a front supporting leg, a front auxiliary supporting leg, a front upper cross beam, a rear upper cross beam and a main beam connecting rod are sequentially installed through a crane, and a longitudinal moving truss vehicle and a crown block are installed on a main beam; installing a whole machine electrical system and a safety device; the middle supporting leg is retreated to the middle of the main beam, and a balance weight is hung at the rear end of the main beam; and the whole machine moves forwards, the main beam moves forwards to the bent cap, and hole passing is completed. According to the method, the construction sequence is optimized, the construction efficiency is improved, and the safety in the construction process is ensured.

Description

Technical Field

[0001] The invention relates to the field of truss beam erection construction, and in particular to a method for installing a highway bridge erection machine at a tunnel opening. Background Art

[0002] As a large-scale mechanical construction equipment, bridge erection machine is widely used in the construction of roads and bridges. The main function of bridge erection machine is to hoist reinforced concrete beams or prestressed concrete and move and place them at the set position. However, the construction of expressways often passes through complex mountainous areas and often encounters special working conditions such as tunnel entrances. It is necessary to use narrow spaces to complete the installation and use of bridge erection machines, which puts higher requirements on construction equipment and construction technology.

[0003] For the special working condition of the tunnel entrance, the width of the tunnel entrance and the length of the site make the installation of the bridge erection machine extremely difficult, especially when the ground in front of the tunnel entrance is uneven and there is a height difference. The bridge erection machine cannot be installed and used normally. In the existing technology, large-tonnage truck cranes are generally used to lift and erect prefabricated beams. However, truck cranes not only have high requirements for the site, but also have very high requirements for the crane station position, prefabricated beam transportation and lifting conditions. They also have a great impact on the surrounding construction work surface and vehicle traffic, long operation time, high lifting costs, and high safety control risks.

[0004] How to use the narrow space at the special working conditions of the tunnel entrance to complete the installation and use of the bridge-building machine has put forward higher requirements on construction equipment and construction technology. Therefore, it is necessary to solve the problem of installation and use of the bridge-building machine under the special working conditions of the tunnel entrance in order to improve the construction efficiency of mountain roads and reduce construction costs. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for installing a highway bridge erecting machine at a tunnel opening.

[0006] In a first aspect, the present invention provides a method for installing a highway bridge erecting machine at a tunnel entrance, wherein the highway bridge erecting machine comprises a front leg, a middle leg, two front auxiliary legs, two rear legs, two rows of main beams, two longitudinally shifting trusses, two overhead cranes, a front upper cross beam, a rear upper cross beam, an electrical system, a safety device, a driving motor, a shoulder beam and a main beam connecting rod;

[0007] The following steps are involved:

[0008] S1: Place the middle leg of the Yuanbao beam at the edge of the tunnel abutment;

[0009] S2: Assemble the main beam on the roadbed at the other end of the tunnel and hoist the main beam to the beam transport vehicle;

[0010] S3: Install the supporting wheel assembly of the middle leg at the lower end of the main beam;

[0011] S4: Use the beam transporter to transport the main beam from the other end of the tunnel to the Yuanbao beam of the middle leg at the tunnel entrance, and connect the middle leg supporting wheel assembly installed at the lower end of the main beam with the Yuanbao beam;

[0012] S5: Install temporary supports to support the rear end of the main beam in the tunnel, remove the main beam from the beam transport vehicle, and erect it on the temporary supports at the rear end;

[0013] S6: Install the temporary rear outriggers at the rear of the temporary support at the rear, support under the temporary rear outriggers at the rear, retract the temporary support at the rear, let the main beam be erected on the temporary rear outriggers at the rear, move the temporary rear outriggers to the side, and make them perpendicular to the Yuanbao beam;

[0014] S7: Use a crane to install the front outrigger, front auxiliary outrigger, front upper crossbeam, rear upper crossbeam, main beam connecting rod in sequence, and install the longitudinal gantry and overhead crane on the main beam;

[0015] S8: Install the whole machine electrical system and safety devices;

[0016] S9: Move the middle outrigger back to the middle of the main beam and hang a counterweight at the rear end of the main beam;

[0017] S10: Move the whole machine forward, use the supporting wheel assembly of the middle and front legs to move the main beam forward to the 1# cap beam to complete the hole passing.

[0018] Preferably, the S9 includes:

[0019] Move the middle outrigger back to the middle of the main beam and move the whole bridge erecting machine forward.

[0020] Move the middle support leg forward to the middle of the main beam and hang a counterweight at the rear end of the main beam.

[0021] Preferably, in S10, the front legs are placed on the 0# abutment cap beam and supported by sleeper pads.

[0022] Preferably, in S10, two lifting mechanisms consisting of a longitudinal gantry vehicle, an overhead crane and a shoulder beam are placed on the main beam at the same position as the middle support leg.

[0023] Preferably, in said S10, the two lifting mechanisms move backward synchronously, and the moving backward speed is the same as the moving forward speed of the main beam, and the lifting mechanisms will remain stationary relative to the middle support leg.

[0024] Preferably, the S10 further includes adjusting the hydraulic cylinders of the front legs and the middle legs to make the entire machine longitudinally level.

[0025] Preferably, after S10, the step further includes:

[0026] S11: Remove the counterweight, move the whole machine forward, and move the two longitudinal gantry cranes and two overhead cranes backward synchronously;

[0027] S12: Prefabricated beam erection, the whole machine moves forward, and the middle outrigger is placed on the prefabricated beam;

[0028] S13: Install the rear legs;

[0029] S14: Remove the temporary rear legs and the whole machine is installed.

[0030] Preferably, in S12, the beam transport vehicle transports the prefabricated beam to the rear of the bridge erecting machine, and the longitudinally shifting gantry vehicle, the overhead crane, and the shoulder beam form a lifting component.

[0031] Preferably, in S12, the lifting component is capable of moving longitudinally and transversely.

[0032] Preferably, the electrical system includes a power system, a control system and a monitoring system.

[0033] In a second aspect, the present invention provides a bridge constructed by using any of the above-mentioned highway bridge erection machine tunnel opening installation methods.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention can complete the installation and hole-passing under the condition that the tail leg cannot be installed in the narrow space of the tunnel and the tail leg lifting cylinder cannot cooperate with the hole-passing. The present invention has formulated detailed hole-passing safety operation regulations, such as adding counterweight balance, setting temporary support, etc., to ensure safety during the construction process. In addition, the present invention optimizes the construction sequence, reduces unnecessary construction steps, and improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic structural diagram of a highway bridge erecting machine.

[0037] Figure 2 It is an exploded view of the parts of the highway bridge erecting machine described in the present invention.

[0038] Figure 3 It is a structural schematic diagram of the lifting of the ingot beam of the supporting legs during transportation by the beam transport vehicle described in the present invention.

[0039] Figure 4 This is a schematic structural diagram of the installation of the middle leg described in the present invention.

[0040] Figure 5 The main beam assembly structure of the present invention is shown in FIG. Figure 1 .

[0041] Figure 6 The main beam assembly structure of the present invention is shown in FIG. Figure 2 .

[0042] Figure 7The main beam assembly structure of the present invention is shown in FIG. Figure 3 .

[0043] Figure 8 It is a structural schematic diagram of hoisting a single-row main beam onto a beam transport vehicle according to the present invention.

[0044] Fig. 9 This is a schematic diagram of the structure of the middle support leg supporting wheel assembly of the present invention penetrating into the main beam.

[0045] Fig.10 The present invention is a schematic structural diagram of a beam transport vehicle transporting a single-row main beam from one end of a tunnel to a tunnel entrance for installation.

[0046] Fig.11 It is a schematic diagram of the structure of installing the front end of a single-row main beam to the middle support leg according to the present invention.

[0047] Fig.12 The present invention provides temporary support and a structural schematic diagram of removing the main beam from the beam transport vehicle.

[0048] Fig.13 It is a schematic structural diagram of installing temporary rear legs according to the present invention.

[0049] Fig.14 It is a schematic structural diagram of the front supporting legs installed according to the present invention.

[0050] Fig.15 It is a schematic structural diagram of the auxiliary supporting legs before installation according to the present invention.

[0051] Fig.16 It is a schematic diagram of the structure of installing the front upper cross beam and the rear upper cross beam according to the present invention.

[0052] Fig.17 The present invention is a schematic diagram of the structure of the installation of the longitudinal gantry vehicle and the overhead crane.

[0053] Fig.18 It is a schematic diagram of the structure of the middle support leg moving backwards according to the present invention.

[0054] Fig.19 It is a schematic structural diagram of the whole machine forward movement (excluding the trolley) described in the present invention.

[0055] Fig. 20 It is a schematic diagram of the structure of the middle leg moving forward according to the present invention.

[0056] Fig.21 It is a schematic diagram of the structure of installing the counterweight according to the present invention.

[0057] Fig. 22 It is a schematic diagram of the structure of the whole machine (excluding the trolley) moving forward to complete the through-hole according to the present invention.

[0058] Fig.23 This is a schematic structural diagram of the present invention in which the counterweight is removed, the middle leg moves forward, and the front leg moves forward.

[0059] Fig.24 It is a schematic structural diagram of the whole machine forward movement (excluding the trolley) described in the present invention.

[0060] Fig.25 This is a structural schematic diagram of the prefabricated beam erection according to the present invention.

[0061] Fig.26 It is a schematic diagram of the structure of the whole machine moving forward according to the present invention.

[0062] Fig. 27 It is a schematic structural diagram of the rear support legs according to the present invention.

[0063] Fig.28 This is a structural schematic diagram of the present invention in which the temporary rear legs are removed and the entire machine is installed.

[0064] Markings in the figure:

[0065] 0-tunnel, 1-front outrigger, 2-middle outrigger, 21-yuanbao beam, 22-supporting wheel group, 3-front auxiliary outrigger, 4-rear outrigger, 5-main beam, 51-main beam segment, 6-longitudinal moving gantry, 7-overhead crane, 8-front upper crossbeam, 9-rear upper crossbeam, 10-driving motor, 11-pole beam, 12-temporary support, 13-temporary rear outrigger, 14-beam transporter, 15-crane, 16-counterweight, 17-precast beam. DETAILED DESCRIPTION

[0066] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0067] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0068] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0069] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0070] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0071] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0072] Example 1

[0073] like Figure 1-Figure 2 As shown, a highway bridge-building machine includes a front outrigger 1, a middle outrigger 2, two front auxiliary outriggers 3, two rear outriggers 4, two rows of main beams 5, two longitudinal gantry vehicles 6, two overhead cranes 7, a front upper crossbeam 8, a rear upper crossbeam 9, an electrical system, a safety device, a drive motor 10, a shoulder beam 11 and a main beam connecting rod.

[0074] The two rows of main beams 5 are perpendicular to the longitudinal travel wheels of the front legs 1 and the middle legs 2, and are arranged in parallel in a "well" shape. The front auxiliary legs 3 are connected to the vertical holes in the triangular truss at the front end of the main beam 5 by a hydraulic cylinder. The front auxiliary legs 3 themselves have holes, and the up and down strokes are fixed with the main beam 5 by pins. The rear legs 4 have the same function as the front auxiliary legs 3, but are placed in the vertical holes of the triangular truss at the rear end of the main beam 5 and connected to the hydraulic cylinder. The longitudinal travel crane 6 is placed on the two rows of main beams 5, parallel to the front legs 1 and the middle legs 2. The overhead crane 7 is placed on the upper part of the longitudinal travel crane 6. The front upper crossbeam 8 and the rear upper crossbeam 9 are placed on the flanges above the front and rear ends of the main beam 5, and are connected by high-strength bolts.

[0075] The front outrigger 1 and the middle outrigger 2 have a longitudinal travel wheel box and a longitudinal drive motor for controlling the main beam 5, collectively referred to as a "wheel group". The lower part has a Yuanbao beam connecting the two wheel groups and a transverse drive motor. The wheel group and the Yuanbao beam are connected by a hydraulic cylinder. There is a pin hole in the vertical component of the front auxiliary outrigger 3. There is a pin hole in the vertical component of the rear outrigger 4. The triangular truss structure of the main beam 5 is composed of multiple sections of main beams. The upper part of the longitudinal truss 6 is a transverse track, and the lower part is a longitudinal wheel box. The upper part of the overhead crane 7 is composed of a lifting wire rope, a shoulder beam 11 and a winch, and the lower part is composed of a transverse travel wheel and a drive motor. The front upper crossbeam 8, the rear upper crossbeam 9, and the main beam connecting rod connect the two main beams to achieve the effect of fixing the main beam spacing. The electrical system includes a power system, a control system, and a monitoring system. The safety device protects the travel relationship between the components and the safety of component lifting.

[0076] A method for installing a highway bridge erecting machine at a tunnel opening comprises the following steps:

[0077] S1: Figure 3-Figure 4 As shown, the ingot beam 21 of the middle leg 2 is placed at the edge of the abutment at the tunnel entrance 0.

[0078] S2: Figure 5-Figure 8 As shown, the main beam 5 is assembled on the roadbed at the other end of the tunnel 0, and the main beam 5 is hoisted to the beam transport vehicle (14), at which time the sleepers of corresponding height can be supported.

[0079] S3: Fig. 9 As shown, a supporting wheel assembly 22 of the middle support leg 2 is installed at the lower end of the main beam 5.

[0080] S4: Figure 10-11 As shown, the main beam 5 is transported from the other end of the tunnel 0 to the ingot beam 21 of the middle leg 2 at the entrance of the tunnel 0 by the beam transport vehicle 14, the main beam 5 is unloaded from the front beam transport vehicle by a crane, and the supporting wheel group 22 of the middle leg 2 is installed at the lower end of the main beam 5 to cooperate with the ingot beam 21 and the front beam transport vehicle 14 drives away.

[0081] S5: Fig.12As shown, a temporary support 12 supporting the rear end of the main beam 5 is installed in front of the rear beam transport vehicle in the tunnel 0, and after the main beam 5 is removed, the beam transport vehicle 14 is erected on the temporary support 12 at the rear end, and the rear beam transport vehicle 14 drives away.

[0082] S6: Install the temporary rear legs 13 at the rear end between the main beam 5 and the temporary support 12 at the rear end, support the temporary rear legs 13 at the rear end with a pad and a lateral sliding support, retract the temporary support 12 at the rear end, and let the main beam 5 be erected on the temporary rear legs 13 at the rear end. Move the temporary rear legs 13 at the rear end to the side position, perpendicular to the Yuanbao beam 21, as shown in FIG. Fig.13 shown.

[0083] S7: Figure 14-17 As shown, a crane 15 is used to sequentially install the front support leg 1 , the front auxiliary support leg 3 , the front upper cross beam 8 , the rear upper cross beam 9 , and the main beam connecting rod, and a longitudinal gantry 6 and an overhead crane 7 are installed on the main beam 5 .

[0084] S8: Install the whole machine electrical system and safety devices.

[0085] S9: Figure 18-21 As shown, the middle leg 2 is retracted to the middle of the main beam 5, and a counterweight 16 is hung at the rear end of the main beam 5; specifically, the following steps are included:

[0086] like Fig.18 As shown, the middle leg 2 is retracted to the middle of the main beam 5, as shown in FIG. Fig.19 As shown, the whole bridge erecting machine (except the trolley) moves forward.

[0087] like Fig. 20 As shown, the middle leg 2 is moved forward to the middle of the main beam 5, as shown in FIG. Fig.21 As shown, a counterweight 16 is suspended at the rear end of the main beam 5 .

[0088] S10: Fig. 22 As shown, the whole machine (except the trolley) moves forward, and the supporting wheel assembly of the middle leg 2 and the front leg 1 is used to move the main beam 5 forward to the 1# cap beam to complete the through-hole.

[0089] Specifically: (1) The front outrigger 1 is placed on the 0# abutment cap beam and supported by sleepers to ensure the horizontal level of the whole machine. The middle outrigger 2 is placed about 30 meters away from the front outrigger and supported by sleepers to ensure the horizontal level of the whole machine. Two lifting mechanisms consisting of a longitudinal gantry trolley 6, a crane 7, and a shoulder beam 11 are placed on the main beam in the same position as the front outrigger 1.

[0090] (2) Remove the two temporary supports 12 at the rear end, retract the two temporary rear legs 13 and the support of the main beam 5, start the longitudinal travel wheels of the front legs 1 and the middle legs 2, and transport the two rows of main beams 5 toward the 1# cap beam. Note: At this time, the two lifting mechanisms move backward synchronously, and the backward speed is the same as the longitudinal forward speed of the main beam 5. The lifting mechanism will remain stationary relative to the middle leg 2. When the front auxiliary leg 3 reaches the top of the 1# cap beam, start the lifting cylinder connecting the front auxiliary leg 3 and the main beam 5, so that the front auxiliary leg 3 falls on the 1# cap beam to bear the load of the main beam 5, and then insert the pin shaft to fix it.

[0091] (3) Use two temporary rear legs 13 to support the main beam 5, so that the middle leg 2 is suspended and hung upside down on the main beam 5, and the middle leg 2 is moved longitudinally along the main beam to the edge of the 0# abutment, and is fixed with riding bolts. The two temporary rear legs 13 and the support of the main beam 5 are retracted, and the height of the main beam 5 is lowered. The middle leg 2 is supported with sleepers to ensure that the whole machine is horizontally level, and the middle leg 2 and the main beam 5 are fixed with riding bolts.

[0092] (4) Retract the lifting cylinder of the front outrigger 1 to hang the front outrigger 1 on the lower end of the main beam 5. Open the front outrigger 1 and reverse the supporting wheel assembly to move it longitudinally to the No. 1 cap beam and support the sleepers. Connect and fix the front outrigger 1 to the main beam 5 with riding bolts.

[0093] (5) Adjust the hydraulic cylinders of the front outrigger 1 and the middle outrigger 2 to make the entire machine horizontal in the longitudinal direction. At this point, the hole crossing is completed and the beam erection is ready.

[0094] S11: Remove the counterweight 16, such as Fig.23 As shown, the whole machine (except the trolley) moves forward. Fig.24 As shown;

[0095] S12: Fig.25 As shown, the prefabricated beam 17 is erected, the whole machine moves forward, and the middle leg 2 is placed on the prefabricated beam 17, as shown in FIG. Fig.26 Specifically: the beam transporter 14 transports the precast beam 17 to the rear of the bridge erecting machine, the longitudinal gantry vehicle 6, the overhead crane 7, and the shoulder beam 11 form a lifting component that can move longitudinally and transversely, and the precast beam 17 is hoisted by a steel wire rope and placed on the platform between the 0# abutment and the 1# cap beam to provide side support.

[0096] S13: Fig. 27 As shown, the rear legs 4 are installed;

[0097] S14: Remove the temporary rear support leg 13, and the whole machine is installed. Fig.28 shown.

[0098] This embodiment formulates detailed safety operation procedures for through-holes, such as adding counterweight balance, setting up temporary supports, and strengthening the fixed connection between the bridge erection machine and the tunnel entrance structure to ensure safety during construction. The construction sequence is optimized, unnecessary construction steps are reduced, and construction efficiency is improved.

[0099] Example 2

[0100] A bridge is constructed by using the highway bridge erection machine tunnel opening installation method as described in Example 1.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for installing a highway bridge erecting machine at a tunnel opening, characterized in that: The highway bridge erecting machine comprises a front outrigger (1), a middle outrigger (2), two front auxiliary outriggers (3), two rear outriggers (4), two rows of main beams (5), two longitudinally shifting gantry vehicles (6), two overhead cranes (7), a front upper crossbeam (8), a rear upper crossbeam (9), an electrical system, a safety device, a driving motor (10), a shoulder beam (11) and a main beam connecting rod; The following steps are involved: S1: placing the ingot beam (21) of the middle leg (2) at the edge of the abutment at the entrance of the tunnel (0); S2: Assembling the main beam (5) on the roadbed at the other end of the tunnel (0), and hoisting the main beam (5) to the beam transport vehicle (14); S3: Installing the supporting wheel assembly (22) of the middle supporting leg (2) at the lower end of the main beam (5); S4: The main beam (5) is transported from the other end of the tunnel (0) to the ingot beam (21) of the middle leg (2) at the entrance of the tunnel (0) by means of a beam transport vehicle (14), and the supporting wheel assembly (22) of the middle leg (2) installed on the main beam (5) is connected to the ingot beam (21); S5: Installing a temporary support (12) supporting the rear end of the main beam (5) in the tunnel (0), removing the main beam (5) from the beam transport vehicle (14), and erecting it on the temporary support (12) at the rear end; S6: Install the temporary rear support leg (13) at the rear of the temporary support (12) at the rear, support the temporary rear support leg (13) at the rear, retract the temporary support (12) at the rear, and allow the main beam (5) to be erected on the temporary rear support leg (13) at the rear, and move the temporary rear support leg (13) to the side, perpendicular to the Yuanbao beam (21); S7: Use a crane (15) to sequentially install the front outrigger (1), the front auxiliary outrigger (3), the front upper crossbeam (8), the rear upper crossbeam (9), and the main beam connecting rod, and install the longitudinal gantry vehicle (6) and the overhead crane (7) on the main beam (5); S8: Install the whole machine electrical system and safety devices; S9: retract the middle support leg (2) to the middle of the main beam (5), and hang a counterweight (16) at the rear end of the main beam (5); S10: The whole machine moves forward, and the supporting wheel assembly of the middle support leg (2) and the front support leg (1) is used to move the main beam (5) forward to the 1# cap beam to complete the hole passing.

2. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 1, characterized in that: The S9 includes: Move the middle support leg (2) back to the middle of the main beam (5), and move the entire bridge erecting machine forward. The middle support leg (2) is moved forward to the middle of the main beam (5), and a counterweight (16) is hung at the rear end of the main beam (5).

3. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 1, characterized in that: In S10, the front support leg (1) is placed on the 0# abutment cap beam and supported by sleeper pads.

4. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 1, characterized in that: In the above S10, two lifting mechanisms consisting of a longitudinal gantry vehicle (6), a crane (7) and a shoulder beam (11) are placed on the main beam at the same position as the middle support leg (2).

5. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 4, characterized in that: In the above S10, the two lifting mechanisms move backward synchronously, and the moving backward speed is the same as the moving forward speed of the main beam (5), and the lifting mechanisms will remain stationary relative to the middle support leg (2).

6. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 1, characterized in that: The S10 also includes adjusting the hydraulic cylinders of the front legs (1) and the middle legs (2) to make the entire machine longitudinally level.

7. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 1, characterized in that: The S10 further includes: S11: The counterweight (16) is removed, the whole machine moves forward, and the two longitudinal gantry vehicles (6) and the two overhead cranes (7) move backward synchronously; S12: The prefabricated beam (17) is erected, the whole machine moves forward, and the middle support leg (2) is placed on the prefabricated beam (17); S13: Install the rear legs (4); S14: Remove the temporary rear legs (13) and the whole machine is installed.

8. The method for installing a highway bridge erecting machine at a tunnel opening according to claim 7, characterized in that: In S12, the beam transport vehicle (14) transports the prefabricated beam (17) to the rear of the bridge erecting machine, and the longitudinal gantry vehicle (6), the overhead crane (7), and the shoulder beam (11) form a lifting component, which can move longitudinally and transversely.

9. The method for installing a highway bridge erecting machine at a tunnel opening according to any one of claims 1 to 8, characterized in that: The electrical system includes a power system, a control system and a monitoring system.

10. A bridge, characterized in that: The highway bridge erection machine is constructed by adopting the tunnel opening installation method of any one of claims 1-9.

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