A method for crossing a tunnel bridge machine hole and erecting a beam in a confined space

Abstract

The application provides a method for passing through a hole of a bridging machine and erecting a beam in a confined space, which adjusts the installation steps of the bridging machine, uses temporary supports and temporary cross beams to solve the problems of the prior art, such as the large difficulty in the construction operation of installing the main beam in the tunnel hole by using the automobile crane due to the confined space in the tunnel, and the repeated beam moving required for erecting the first cross beam plate.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for constructing bridges and erecting beams in confined spaces using a tunnel-crossing bridge erecting machine. Background Technology

[0002] Currently, the conventional construction method for installing bridge erecting machines and constructing bridge girders across tunnels involves using a truck crane inside the tunnel to install a single row of main beams onto the central support legs. The main beams are then installed gradually using temporary support legs. However, due to the limited space inside the tunnel, installing the main beams using a truck crane inside the tunnel is extremely difficult. Furthermore, when installing the first span of the bridge erecting machine, the rear end of the main beam is located inside the tunnel, restricting the machine's movement along the transverse direction due to the width of the tunnel entrance. This prevents the machine from moving the outer beams of the girders to the designed placement position along the transverse direction. Therefore, in the existing technology, when erecting the first span of the beam, the outer and secondary beams of the beam are usually temporarily stored at the position of the secondary beam and the middle beam. After the middle beam and secondary beam are moved into place by the longitudinal truss crane, the main beam is driven forward until the main beam leaves the tunnel. Finally, the temporarily stored outer beam is moved into place by the longitudinal truss crane. Therefore, the conventional construction method requires repeated movement of the main beam during the erection of the first span of the beam, and the erection of the first span of the beam cannot be completed in one step. Summary of the Invention

[0003] The present invention aims to provide a method for constructing bridge erection machines through tunnels and erecting beams in confined spaces, in order to solve the problems of the existing technology, which is difficult to operate when using a truck crane to install the main beam in the tunnel due to the limited space inside the tunnel, and the need to repeatedly move the beam when erecting the first span of the beam.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for constructing a bridge erection machine for tunneling and girder erection in confined space, the bridge erection machine comprising two parallel and spaced main beams, a rear upper crossbeam and a front upper crossbeam connecting the two main beams, and a longitudinal girder trolley slidably mounted on the main beams. Each main beam comprises six longitudinal segments connected in sequence, the six longitudinal segments being numbered sequentially as 1#, 2#, ... 6#. The main beams are equipped with front auxiliary legs, front legs, middle legs, and rear legs at intervals. The method for constructing a bridge erection machine for tunneling and girder erection in confined space includes the following steps:

[0006] S1, place the middle support leg and the front support leg outside the tunnel entrance, install the rear support leg to the rear end of the 6# longitudinal segment, then hoist the 6# longitudinal segment onto the middle support leg and the front support leg, then install the rear upper crossbeam, connect the 6# longitudinal segments of the two main beams through the rear upper crossbeam, and then install the longitudinal girder crane onto the 6# longitudinal segment;

[0007] S2, hoist the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment in sequence, so that the 6# longitudinal segment, the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment are connected together in sequence. After the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment are installed, the installed main beam is moved back into the tunnel by a predetermined distance.

[0008] S3, hoist the 2# longitudinal segment to the front end of the 3# longitudinal segment for assembly, hoist the 1# longitudinal segment to the 2# longitudinal segment for assembly, then install the front auxiliary support leg at the front end of the 1# longitudinal segment and install the front upper crossbeam to connect the 1# longitudinal segments of the two main beams through the front upper crossbeam, thereby completing the assembly of the entire bridge erecting machine;

[0009] S4. After the bridge erecting machine is fully assembled, the middle support leg and the front support leg are moved to drive the main beam forward to continue passing through the hole. After passing through the hole, the middle support leg is located on the ground outside the tunnel entrance, the front support leg is supported on the pier, and the front auxiliary support leg is located on the side of the front support leg away from the middle support leg with its lower end suspended. The rear end of the No. 5 longitudinal segment and the No. 6 longitudinal segment are both located inside the tunnel.

[0010] S5, remove the rear upper crossbeam and the rear support leg, install the removed rear upper crossbeam and the rear support leg onto the 4# longitudinal beam segment respectively, and then temporarily fix the 5# longitudinal segment and 6# longitudinal segment of the two main beams with temporary crossbeams, and use temporary supports to support the 5# longitudinal segment and 6# longitudinal segment below.

[0011] S6, disconnect the connection between the 5# longitudinal segment and the 4# longitudinal segment, so that the 5# longitudinal segment and the 6# longitudinal segment are separated from the rest of the main beam, and then the precast beam is erected by the bridge erecting machine to complete the installation of the first span beam slab;

[0012] S7. After the entire span of precast beams is erected, the bridge erecting machine is reset and the next span is passed through the hole. After the hole is passed, the bridge erecting machine is used to complete the erection of the precast beams of the next span.

[0013] Furthermore, in step S2, during the process of driving the installed main beam back into the tunnel, the middle support leg is also moved along the main beam. By adjusting the position of the middle support leg in the length direction of the main beam, it is ensured that the middle support leg, the rear support leg, and the front support leg provide stable support for the bridge erecting machine.

[0014] Furthermore, during the passage process in step S4, after the middle support leg is moved into place, the main beam is first raised by the front support leg to install the lateral movement track and lateral movement drive mechanism of the middle support leg, and then the front support leg is moved.

[0015] Furthermore, in step S5, after removing the rear upper crossbeam and the rear support leg, a forklift and a truck crane are used to install the rear upper crossbeam to the top of the No. 4 longitudinal beam segment, and the rear support leg is installed below the No. 4 longitudinal beam segment.

[0016] Furthermore, in step S5, before removing the rear support leg, the longitudinal girder crane is driven to move along the main beam toward a position away from the tunnel entrance until it moves between the middle support leg and the front support leg.

[0017] Further, step S2 includes the following steps:

[0018] S21, the 5# longitudinal segment is hoisted to the front end of the 6# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel, so that the 6# longitudinal segment retreats into the tunnel, and the front end of the 5# longitudinal segment is located outside the tunnel entrance;

[0019] S22, the 4# longitudinal segment is hoisted to the front end of the 5# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel until the 5# longitudinal segment is retreated into the tunnel and the front end of the 4# longitudinal segment is located outside the tunnel entrance;

[0020] S23, the 3# longitudinal segment is hoisted to the front end of the 4# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel.

[0021] Furthermore, the temporary support includes a support block and a support pad, the support pad is installed on the top surface of the support block, and the bottom surfaces of the 5# longitudinal segment and the 6# longitudinal segment are placed on the support pad corresponding to the temporary support.

[0022] Furthermore, the support includes a base, a support seat, and a connector. The base and the support seat are arranged parallel to each other and spaced apart. The connector is fixedly connected to the base and the support seat. The pad is disposed on the top surface of the support seat.

[0023] Furthermore, the connector includes a plurality of vertical connecting rods and a plurality of oblique connecting rods. The plurality of vertical connecting rods are arranged in parallel at intervals. The two ends of each vertical connecting rod are respectively fixedly connected to the base and the support. An oblique connecting rod is arranged between two adjacent vertical connecting rods. One end of the oblique connecting rod is fixedly connected to the base and the bottom end of one of the vertical connecting rods, and the other end of the oblique connecting rod is fixedly connected to the support and the top end of the other vertical connecting rod.

[0024] Furthermore, in step S7, resetting the bridge erecting machine includes the following steps:

[0025] Reconnect the 5# longitudinal segment with the 4# longitudinal segment so that the 5# longitudinal segment and the 6# longitudinal segment, together with the remaining longitudinal segments, form a whole again;

[0026] Remove the temporary crossbeam and the temporary supports under the No. 5 longitudinal segment and the No. 6 longitudinal segment;

[0027] Remove the rear upper crossbeam and the rear support leg from the No. 4 longitudinal beam segment and reinstall them onto the No. 6 longitudinal segment.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects:

[0029] The aforementioned method for constructing bridge erection machines in confined spaces, involving tunnel crossings and beam erection, addresses the technical challenge of installing main beams inside tunnels using truck cranes due to limited space. This is achieved by adjusting the installation steps of the bridge erection machine and using temporary supports and crossbeams. Specifically, the main beams of the bridge erection machine are installed outside the tunnel entrance using truck cranes or similar lifting equipment. After the installation of the corresponding longitudinal segments, the main beams are then moved back into the tunnel by a predetermined length for the installation of the next longitudinal segment. This method effectively solves the technical difficulty of installing main beams inside tunnels using truck cranes due to limited space.

[0030] The above-mentioned method for constructing bridge erection machines in confined spaces through tunnels and erecting beams separates the portion of the main beam located inside the tunnel from the portion located outside the tunnel when erecting the first span beam. This allows the bridge erection machine to move along the transverse direction of the bridge without being restricted by the width of the tunnel opening. The bridge erection machine can directly hoist the outer side beams into place, thus eliminating the need to repeatedly move the main beam during the erection of the first span beam, enabling the first span beam to be installed in one step.

[0031] The above-mentioned method for constructing bridge erection machines in confined spaces, which involves passing through spans and erecting beams, allows for simultaneous span-passing operations during the installation of the bridge erection machine. By moving the rear, middle, front, and front auxiliary legs, and using the weight of the longitudinal girder trolley and the main beam itself as counterweight, the overturning resistance coefficient of the bridge erection machine during installation and span-passing is improved. As a result, there is no need to add a rear counterweight to the rear end of the main beam during span-passing, simplifying the span-passing operation process. Attached Figure Description

[0032] Figure 1 This is a structural diagram illustrating the installation of longitudinal segment #6 in a method for constructing a tunnel-crossing bridge erection machine and beam erection in a confined space according to a preferred embodiment of the present invention.

[0033] Figure 2 This is a structural diagram illustrating the installation of the upper crossbeam during the construction of a tunnel-crossing bridge erection machine in a confined space, which is a preferred embodiment of the present invention.

[0034] Figure 3 This is a structural diagram illustrating the installation of the longitudinal girder crane during the construction of a tunnel-crossing and bridge-erecting machine in a confined space, according to a preferred embodiment of the present invention.

[0035] Figure 4 This is a structural diagram illustrating the installation of longitudinal segment #5 in the confined space tunnel-crossing and bridge-erecting construction method of the preferred embodiment of the present invention.

[0036] Figure 5 This is a structural diagram illustrating the installation of longitudinal segment #4 in the confined space tunnel-crossing and bridge-erecting construction method of the preferred embodiment of the present invention.

[0037] Figure 6 This is a structural diagram illustrating the installation of the No. 3 longitudinal segment in the confined space tunnel-crossing and bridge-erecting construction method of the preferred embodiment of the present invention.

[0038] Figure 7 This is a structural diagram illustrating the installation of longitudinal segments #2 and #1 during the construction of a tunnel-crossing bridge erecting machine and beam erection in a confined space, according to a preferred embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram of step S4 of the method for constructing a tunnel-crossing bridge erection machine and erecting beams in a confined space, which is a preferred embodiment of the present invention.

[0040] Figure 9 This is a schematic diagram of step S5 of the method for constructing a tunnel-crossing bridge erection machine and erecting beams in a confined space, which is a preferred embodiment of the present invention.

[0041] Figure 10 This is a schematic diagram illustrating the state of the first span beam erection during the construction of the tunnel-crossing bridge erection machine and beam erection method in a confined space, which is a preferred embodiment of the present invention.

[0042] Figure 11 This is a front view of the temporary support used in the construction method of tunnel-crossing and bridge-erecting machine in confined space according to a preferred embodiment of the present invention.

[0043] Figure 12 for Figure 11 A three-dimensional structural diagram of the temporary support pier shown.

[0044] Explanation of main component symbols

[0045] 10. Main beam; 11. Longitudinal segment #6; 12. Longitudinal segment #5; 13. Longitudinal segment #4; 14. Longitudinal segment #3; 15. Longitudinal segment #2; 16. Longitudinal segment #1; 20. Rear upper crossbeam; 30. Front upper crossbeam; 40. Longitudinal girder crane; 50. Front auxiliary leg; 60. Front leg; 70. Middle leg; 80. Rear leg; 200. Tunnel; 300. Lifting device; 400. Pier; 600. Temporary support; 610. Pier; 611. Base; 612. Support seat; 613. Connector; 614. Vertical connecting rod; 615. Diagonal connecting rod; 630. Support pad; 700. Precast beam. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] Please see Figures 1 to 10This invention provides a preferred embodiment of a method for constructing a bridge erecting machine for tunneling and girder erection in confined spaces. The bridge erecting machine (not shown) includes two parallel and spaced main beams 10, a rear upper crossbeam 20 and a front upper crossbeam 30 connecting the two main beams 10, and a longitudinal girder crane 40 slidably mounted on the main beams 10. Each main beam 10 includes six longitudinal segments (not shown) connected in sequence, numbered 1#, 2#, ... 6#. A front auxiliary leg 50, a front support leg 60, a middle support leg 70, and a rear support leg 80 are spaced apart on the main beam 10. The rear upper crossbeam 20 and the front upper crossbeam 30 are spaced apart along the length of the main beam 10. The structure of the bridge erecting machine is prior art and will not be described in detail here for brevity.

[0050] The method for constructing bridge erection machines and girder erection in confined spaces includes the following steps:

[0051] S1, as Figure 1 As shown, the middle support leg 70 and the front support leg 60 are placed outside the tunnel entrance 200. The rear support leg 80 is installed to the rear end of the 6# longitudinal segment 11 of the main beam 10. Then, the 6# longitudinal segment 11 is hoisted onto the middle support leg 70 and the front support leg 60. Subsequently, the rear upper crossbeam 20 is installed. Figure 2 The rear upper crossbeam 20 connects the 6# longitudinal segment 11 of the two main beams 10, and then the longitudinal girder crane 40 is installed on the 6# longitudinal segment 11, as follows. Figure 3 As shown.

[0052] In this embodiment, the longitudinal segments of the main beam 10, the rear upper crossbeam 20, and the longitudinal girder crane 40 are hoisted by a hoisting device 300, such as a truck crane, outside the tunnel 200 entrance.

[0053] S2, sequentially hoist longitudinal segment 12 (5#), longitudinal segment 13 (4#), and longitudinal segment 14 (3#), so that longitudinal segment 11 (6#), longitudinal segment 12 (5#), longitudinal segment 13 (4#), and longitudinal segment 14 (3#) are connected together in sequence. After the installation of longitudinal segment 12 (5#), longitudinal segment 13 (4#), and longitudinal segment 14 (3#) is completed, the main beam 10 is retracted into the tunnel 200 by a predetermined distance.

[0054] Specifically, step S2 includes the following steps:

[0055] S21, please refer to Figure 4 The 5# longitudinal segment 12 is hoisted to the front end of the 6# longitudinal segment 11 for assembly. Then, the installed main beam 10 is driven to retreat a preset distance into the tunnel 200, so that the 6# longitudinal segment 11 retreats into the tunnel 200, and the front end of the 5# longitudinal segment 12 is located outside the tunnel 200.

[0056] The movement of the main beam 10 into the tunnel 200 can be driven by the middle support leg 70, which is existing technology and will not be described in detail here for brevity. In addition, after the 6# longitudinal segment 11 retracts into the tunnel 200, the middle support leg 70 will be moved a preset distance towards the rear support leg 80 to ensure the stability of the center of gravity of the main beam 10.

[0057] S22, please refer to Figure 5 The 4# longitudinal segment 13 is hoisted to the front end of the 5# longitudinal segment 12 for assembly. Then, the installed main beam 10 is driven to retreat a preset distance into the tunnel 200 until the 5# longitudinal segment 12 is retreated into the tunnel 200 and the front end of the 4# longitudinal segment 13 is located outside the tunnel 200.

[0058] In addition, during the installation of longitudinal segment 13 #4, the position of the middle support leg 70 was adjusted along the length of the main beam 10 to ensure the stability of the center of gravity of the main beam 10.

[0059] S23, please refer to Figure 6 The #3 longitudinal segment 14 was hoisted to the front end of the #4 longitudinal segment 13 for assembly. Then, the installed main beam 10 was driven to retreat a predetermined distance into the tunnel 200, ensuring that the front end of the #3 longitudinal segment 14 was outside the tunnel entrance. During the installation of the #3 longitudinal segment 14, the position of the middle support leg 70 was adjusted along the length of the main beam 10 to ensure the stability of the main beam 10's center of gravity.

[0060] S3, please see Figure 7 The No. 2 longitudinal segment 15 is hoisted to the front end of the No. 3 longitudinal segment 14 for assembly, and the No. 1 longitudinal segment 16 is hoisted to the front end of the No. 2 longitudinal segment 15 for assembly. Then, the front auxiliary support leg 50 is installed at the front end of the No. 1 longitudinal segment 16, so that the bottom end of the front auxiliary support leg 50 is supported on the pier 400. The front upper crossbeam 30 is then installed, and the No. 1 longitudinal segment 16 of the two main beams 10 is connected through the front upper crossbeam 30 to complete the assembly of the bridge erecting machine.

[0061] S4, please see Figure 8 After the bridge erecting machine is assembled, the middle support leg 70 and the front support leg 60 are moved to drive the main beam 10 forward (i.e. away from the tunnel) to continue passing through the hole. After passing through the hole, the middle support leg 70 is located on the ground outside the tunnel 200 opening, the front support leg 60 is supported on the pier 400 of the bridge pier, the front auxiliary support leg 50 is located on the side of the front support leg 60 away from the middle support leg 70 and the lower end is suspended in the air, and the rear end of the 5# longitudinal segment 12 and the 6# longitudinal segment 11 are located inside the tunnel 200.

[0062] In this embodiment, during the process of passing through the hole in step S4, after the middle support leg 70 is in place, the main beam 10 is first raised by the front support leg 60, the transverse track and transverse wheel box of the middle support leg 70 are installed, and then the front support leg 60 is moved; finally, the main beam 10 is driven forward by the middle support leg 70 by a preset distance.

[0063] S5, please see Figure 9 Remove the rear upper crossbeam 20 and rear support leg 80, and install the removed rear upper crossbeam 20 and rear support leg 80 onto the 4# longitudinal beam segment 13 respectively. Then, temporarily fix the 5# longitudinal segment 12 and 6# longitudinal segment 11 of the two main beams 10 through a temporary crossbeam (not shown in the figure), and use temporary support 600 to support the 5# longitudinal segment 12 and 6# longitudinal segment 11 below.

[0064] In step S5, before removing the rear support leg 80, the longitudinal truss trolley 40 is driven to move along the main beam 10 towards a position away from the tunnel entrance 200 until it reaches a position between the middle support leg 70 and the front support leg 60, so that the weight of the longitudinal truss trolley 40 ensures the stability of the main beam 10. After removing the rear upper crossbeam 20 and the rear support leg 80, a forklift and a truck crane are used to install the rear upper crossbeam 20 onto the top of the No. 4 longitudinal beam segment 13, and the rear support leg 80 is installed below the No. 4 longitudinal beam segment 13.

[0065] In this embodiment, the temporary crossbeam includes two temporary clamps (not shown) and connecting bolts (not shown). The two temporary clamps are welded to the two main beams 10 respectively, and the two temporary clamps are detachably connected together by the connecting bolts.

[0066] Please see also Figure 11 and Figure 12In this embodiment, the temporary support 600 includes a pier 610 and a support pad 630, with the support pad 630 mounted on the top surface of the pier 610. The bottom surfaces of longitudinal segments 12 (#5) and 11 (#6) are placed on the support pads 630 of the corresponding temporary supports 600. Specifically, the pier 610 includes a base 611, a support seat 612, and a connector 613. The base 611 and the support seat 612 are arranged vertically parallel and spaced apart. The connector 613 fixes the base 611 and the support seat 612 together, and the support pad 630 is disposed on the top surface of the support seat 612. In this embodiment, the pier 610 is generally cubic in shape. The base 611 and the support seat 612 have the same structure, both being rectangular frames formed by mutual fixing of several rods. The connector 613 includes several vertical connecting rods 614 and several diagonal connecting rods 615. The vertical connecting rods 614 are arranged in parallel at intervals, and each vertical connecting rod 614 is fixedly connected to a base 611 and a support 612 at both ends. An diagonal connecting rod 615 is arranged between two adjacent vertical connecting rods 614, and one end of the diagonal connecting rod 615 is fixedly connected to the base 611 and the bottom end of one of the vertical connecting rods 614, while the other end of the diagonal connecting rod 615 is fixedly connected to the support 612 and the top end of the other vertical connecting rod 614. The support 630 is a square timber, which is placed on the top surface of the support 612.

[0067] S6, please see Figure 10 After disconnecting the connection between longitudinal segment 12 (5#) and longitudinal segment 13 (4#), and separating longitudinal segment 12 (5#) and longitudinal segment 11 (6#) from the rest of the main beam 10, the precast beam 700 is erected by the bridge erecting machine to complete the installation of the first span beam.

[0068] S7. After the entire span of precast beam 700 is erected, the bridge erecting machine is reset to allow the next span to pass through the span. After passing through the span, the bridge erecting machine is used to complete the erection of the precast beam 700 for the next span. The connection and disassembly methods between the various longitudinal segments of the main beam 10 are existing technologies and will not be described in detail here for brevity.

[0069] Specifically, resetting the bridge erecting machine includes the following steps:

[0070] Reconnect longitudinal segment 12 (5#) and longitudinal segment 13 (4#) so that longitudinal segment 12 (5#) and longitudinal segment 11 (6#) and the remaining longitudinal segments of the main beam 10 form a whole again.

[0071] Remove the temporary crossbeams. Specifically, remove the connecting bolts from the two temporary clamps, and then cut the temporary clamps off the main beam 10. Then, remove the temporary supports 600 that support the underside of longitudinal segment 12 (5#) and longitudinal segment 11 (6#).

[0072] Remove the rear upper crossbeam 20 and rear support leg 80 from the 4# longitudinal beam segment 13 and reinstall them onto the 6# longitudinal segment 11.

[0073] The aforementioned method for constructing bridge erection machines in confined spaces, involving tunnel crossings and beam erection, addresses the technical challenge of installing the main beam 10 within the tunnel 200 due to limited space by adjusting the installation steps, using temporary supports 600, and temporary crossbeams. Specifically, the main beam 10 is installed outside the tunnel 200 using a crane or similar lifting device 300. After completing the installation of the corresponding longitudinal segments, the main beam 10 is then moved back into the tunnel 200 by a predetermined length for the installation of the next longitudinal segment. This method solves the technical difficulty of installing the main beam within the tunnel using a crane due to limited space.

[0074] The above-mentioned method for constructing bridge erection machines in confined spaces through tunnels and erecting beams involves separating the portion of the main beam 10 located inside the tunnel 200 from the portion located outside the tunnel 200 when erecting the first span beam. This allows the bridge erection machine to move along the transverse direction without being restricted by the width of the tunnel opening, enabling the machine to directly hoist the outer side beams into place. Consequently, during the erection of the first span beam, there is no need to repeatedly move the main beam 10, allowing the first span beam to be installed in one step.

[0075] The above-mentioned method for bridge erection machine to pass through the tunnel and erect beams in confined space involves performing the crossing operation simultaneously during the installation of the bridge erection machine. After the bridge erection machine completes the crossing operation, the portion of the main beam 10 located inside the tunnel 200 is separated from the portion located outside the tunnel 200. Therefore, during the crossing process, the bridge erection machine can improve its anti-overturning coefficient during installation and crossing by using the movement of the rear support leg 80, middle support leg 70, front support leg 60, and front auxiliary support leg 50, as well as the weight of the longitudinal girder trolley 40 and the main beam 10 itself as counterweight. This eliminates the need to add a rear counterweight to the rear end of the main beam during the crossing process, simplifying the crossing operation.

[0076] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for constructing a bridge erection machine for tunneling and girder erection in a confined space, the bridge erection machine comprising two parallel and spaced main beams, a rear upper crossbeam and a front upper crossbeam connecting the two main beams, and a longitudinal truss trolley slidably mounted on the main beams, each main beam comprising six longitudinal segments connected in sequence, the six longitudinal segments being numbered sequentially as 1#, 2#, 3#, 4#, 5#, and 6#; the main beams are equipped with front auxiliary legs, front legs, middle legs, and rear legs at intervals, characterized in that... The method for constructing bridge erection machines and girder erection in confined spaces includes the following steps: S1, place the middle support leg and the front support leg outside the tunnel entrance, install the rear support leg to the rear end of the 6# longitudinal segment, then hoist the 6# longitudinal segment onto the middle support leg and the front support leg, then install the rear upper crossbeam, connect the 6# longitudinal segments of the two main beams through the rear upper crossbeam, and then install the longitudinal girder crane onto the 6# longitudinal segment; S2, hoist the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment in sequence, so that the 6# longitudinal segment, the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment are connected together in sequence. After the 5# longitudinal segment, the 4# longitudinal segment and the 3# longitudinal segment are installed, the installed main beam is moved back into the tunnel by a predetermined distance. S3, hoist the 2# longitudinal segment to the front end of the 3# longitudinal segment for assembly, hoist the 1# longitudinal segment to the 2# longitudinal segment for assembly, then install the front auxiliary support leg at the front end of the 1# longitudinal segment and install the front upper crossbeam to connect the 1# longitudinal segments of the two main beams through the front upper crossbeam, thereby completing the assembly of the entire bridge erecting machine; S4. After the bridge erecting machine is fully assembled, the middle support leg and the front support leg are moved to drive the main beam forward to continue passing through the hole. After passing through the hole, the middle support leg is located on the ground outside the tunnel entrance, the front support leg is supported on the pier, and the front auxiliary support leg is located on the side of the front support leg away from the middle support leg with its lower end suspended. The rear end of the No. 5 longitudinal segment and the No. 6 longitudinal segment are both located inside the tunnel. S5, remove the rear upper crossbeam and the rear support leg, install the removed rear upper crossbeam and the rear support leg onto the 4# longitudinal segment respectively, then temporarily fix the 5# and 6# longitudinal segments of the two main beams with temporary crossbeams, and use temporary supports to support the 5# and 6# longitudinal segments below them. S6, disconnect the connection between the 5# longitudinal segment and the 4# longitudinal segment, so that the 5# longitudinal segment and the 6# longitudinal segment are separated from the rest of the main beam, and then the precast beam is erected by the bridge erecting machine to complete the installation of the first span beam slab; S7. After the entire span of precast beams is erected, the bridge erecting machine is reset and the next span is passed through the hole. After the hole is passed, the bridge erecting machine is used to complete the erection of the precast beams of the next span.

2. The method for constructing tunnel-crossing bridge erection machines and beams in confined spaces as described in claim 1, characterized in that, In step S2, during the process of driving the installed main beam back into the tunnel, the middle support leg is also moved along the main beam. By adjusting the position of the middle support leg in the length direction of the main beam, the middle support leg, the rear support leg, and the front support leg are ensured to provide stable support for the bridge erecting machine.

3. The method for constructing a tunnel-crossing bridge erection machine and erecting beams in a confined space as described in claim 1, characterized in that... During the passage process in step S4, after the middle support leg is moved into place, the main beam is first raised by the front support leg to install the lateral movement track and lateral movement drive mechanism of the middle support leg, and then the front support leg is moved.

4. The method for constructing tunnel-crossing bridge erection machines and beams in confined spaces as described in claim 1, characterized in that, In step S5, after removing the rear upper crossbeam and the rear outrigger, a forklift and a truck crane are used to install the rear upper crossbeam to the top of the 4# longitudinal segment, and the rear outrigger is installed below the 4# longitudinal segment.

5. The method for constructing tunnel-crossing bridge erection machines and beams in confined spaces as described in claim 1, characterized in that... In step S5, before removing the rear support leg, the longitudinal girder crane is driven to move along the main beam toward a position away from the tunnel entrance until it moves between the middle support leg and the front support leg.

6. The method for constructing tunnel-crossing bridge erection machines and beams in confined spaces as described in claim 1, characterized in that, Step S2 includes the following steps: S21, the 5# longitudinal segment is hoisted to the front end of the 6# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel, so that the 6# longitudinal segment retreats into the tunnel, and the front end of the 5# longitudinal segment is located outside the tunnel entrance; S22, the 4# longitudinal segment is hoisted to the front end of the 5# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel until the 5# longitudinal segment is retreated into the tunnel and the front end of the 4# longitudinal segment is located outside the tunnel entrance; S23, the 3# longitudinal segment is hoisted to the front end of the 4# longitudinal segment for assembly, and then the installed main beam is driven to retreat a preset distance into the tunnel.

7. The method for constructing a tunnel-crossing bridge erection machine and beam erection in a confined space as described in claim 1, characterized in that, The temporary support includes a support block and a support pad. The support pad is installed on the top surface of the support block, and the bottom surfaces of the 5# longitudinal segment and the 6# longitudinal segment are placed on the support pad corresponding to the temporary support.

8. The method for constructing a tunnel-crossing bridge erection machine and beam erection in a confined space as described in claim 7, characterized in that, The support includes a base, a support seat, and a connector. The base and the support seat are arranged parallel to each other and spaced apart. The connector is fixedly connected to the base and the support seat. The pad is disposed on the top surface of the support seat.

9. The method for constructing a tunnel-crossing bridge erection machine and beam erection in a confined space as described in claim 8, characterized in that, The connector includes several vertical connecting rods and several diagonal connecting rods. The vertical connecting rods are arranged in parallel and spaced apart. The two ends of each vertical connecting rod are fixedly connected to the base and the support seat, respectively. An diagonal connecting rod is arranged between two adjacent vertical connecting rods. One end of the diagonal connecting rod is fixedly connected to the base and the bottom end of one of the vertical connecting rods, and the other end of the diagonal connecting rod is fixedly connected to the support seat and the top end of the other vertical connecting rod.

10. The method for constructing tunnel-crossing bridge erection machines and beams in confined spaces as described in claim 1, characterized in that, Step S7, resetting the bridge erecting machine includes the following steps: Reconnect the 5# longitudinal segment with the 4# longitudinal segment so that the 5# longitudinal segment and the 6# longitudinal segment, together with the remaining longitudinal segments, form a whole again; Remove the temporary crossbeam and the temporary supports under the No. 5 longitudinal segment and the No. 6 longitudinal segment; Remove the rear upper crossbeam and the rear support leg from the 4# longitudinal segment and reinstall them onto the 6# longitudinal segment.

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