Construction method of continuous steel plate girder bridge

Abstract

The application provides a construction method of a continuous steel plate girder bridge, which is used for constructing a bridge body with bolted joints between bridge spans, and comprises the following steps: S1, installing a bridge erecting machine at a designated position; S2, simultaneously hoisting a first girder body and a second girder body to a designated girder dropping position by using the bridge erecting machine to drop the girders, and splicing and fixing the first girder body and the second girder body after the girder dropping is completed; S3, controlling the bridge erecting machine to pass through a hole; S4, hoisting a next girder body to the designated girder dropping position by using the bridge erecting machine to drop the girder, and splicing and fixing the girder with adjacent girders that have been erected after the girder dropping is completed; and S5, repeating S3 and S4 until the construction is completed. In the whole bridge construction process of the application, a temporary construction support is not needed to support and fix the girders, and the construction cost can be significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a construction method for a continuous steel plate girder bridge. Background Technology

[0002] In continuous beam bridges, the beams will flex and deform due to the load. In order to reduce the deformation of each beam segment, reduce stress concentration, and improve the durability of the bridge, bolted joints are usually set between the bridge spans (two piers). The bolted joints divide the beams in a bridge span into several relatively independent beams, so that each beam can work together and share the load when under stress, thereby improving the overall load-bearing capacity and stability of the bridge.

[0003] In actual construction, when a single beam is not connected to other beams, it is only set on a single pier. However, a single pier cannot provide stable support for a single beam. In this case, temporary supports are usually set up to support and fix the beam until it is connected to the adjacent beam. However, this method is not only costly but also inefficient. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for continuous steel plate girder bridges, which solves the problems of high construction cost and low construction efficiency in the construction of continuous girder bridges with bolted joints located between bridge spans.

[0005] The present invention is achieved through the following technical solution.

[0006] A construction method for a continuous steel plate girder bridge, used for constructing bridge sections with bolted joints located between spans, includes the following steps: S1: Install the bridge erecting machine at the designated location; S2: Use the bridge erecting machine to lift the first beam and the second beam to the designated beam placement position for beam placement, and after the beam placement is completed, splice and fix the first beam and the second beam together; S3: Control the bridge erecting machine to pass through the hole; S4: The bridge erecting machine lifts the next beam to the designated beam placement position for placement, and after placement, splices and fixes it with the adjacent beam that has been erected. S5: Repeat S3 and S4 until construction is completed.

[0007] As a further improvement of the present invention, in step S2, the first beam and the second beam are fixedly connected by a bolted joint.

[0008] As a further improvement of the present invention, when installing the bridge erecting machine in step S1, the rear or middle support leg of the bridge erecting machine is supported on the bridge platform, the front support leg of the bridge erecting machine is supported on the second pier, and a first pier is provided between the bridge platform and the second pier.

[0009] As a further improvement of the present invention, a support frame is detachably connected to the second pier, the front outrigger is mounted on the support frame, and the support frame and the second pier form an area that allows the second beam to pass through.

[0010] As a further improvement of the present invention, the support frame includes a crossbeam and two support columns, one end of each of the two support columns is fixedly connected to both ends of the crossbeam, and the other end is fixed to the second pier by a detachable fastener.

[0011] As a further improvement of the present invention, step S3 specifically includes: S31: Adjust the installation positions of the front support leg and the rear support leg according to the construction requirements; S32: Control the bridge erecting machine to move along the construction direction until the position of the bridge erecting machine meets the construction requirements; As a further improvement of the present invention, after completing step S31, the rear support leg is installed on the beam that has been erected, and the front support leg is installed on the pier for erecting the next beam.

[0012] As a further improvement of the present invention, the bridge erecting machine includes at least four overhead cranes. During step S2, the first beam is lifted by the first and second overhead cranes, and the second beam is lifted by the third and fourth overhead cranes.

[0013] As a further improvement of the present invention, before performing step S4, the following steps need to be performed, specifically including: S41: Lay beam transport tracks on the completed beams; S42: The next beam is transported to the designated lifting position by the beam transport vehicle via the beam transport track.

[0014] The beneficial effects of this invention are: This invention provides a construction method for continuous steel plate girder bridges, which is used for the construction of continuous girder bridges with bolted joints located between bridge spans. During the entire bridge construction process, there is no need to set up temporary construction scaffolds to support and fix the beams, which can significantly reduce construction costs. Attached Figure Description

[0015] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein: Figure 1 This is a flowchart illustrating the construction process of the present invention. Figure 2 This is a diagram showing the positional relationship of the bridge erecting machine in step S1; Figure 3 The construction drawings are for step S2; Figure 4 The positional relationship diagram of the bridge erecting machine after completing step S3; Figure 5 This is a structural schematic diagram of the support frame; In the picture: 1. Bridge erecting machine; 11. No. 1 overhead crane; 12. No. 2 overhead crane; 13. No. 3 overhead crane; 14. No. 4 overhead crane; 15. Front outrigger; 16. Rear outrigger; 17. Front auxiliary outrigger; 18. Rear auxiliary outrigger; 2. First beam; 3. Second beam; 4. Abutment; 5. Support frame; 51. Crossbeam; 52. Support column; 6. Fasteners; 7. First pier; 8. Second pier; 9. Bolted joint. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0018] This invention provides a construction method for a continuous steel plate girder bridge, used for constructing bridge sections with bolted joints located between spans, comprising the following steps: S1: Install bridge erecting machine 1 at the designated location; S2: Use bridge erecting machine 1 to lift the first beam 2 and the second beam 3 to the designated beam placement position for beam placement, and after the beam placement is completed, splice and fix the first beam 2 and the second beam 3 together; S3: Control the bridge erecting machine 1 through the hole; S4: The bridge erecting machine 1 will lift the next beam to the designated beam placement position and place it there. After the beam is placed, it will be spliced ​​and fixed with the adjacent beam that has been erected. S5: Repeat steps S3 and S4 until construction is complete.

[0019] It should be noted that when using the construction method of this invention, the bridge piers of the bridge body have already been erected according to the construction requirements.

[0020] Reference Figure 1When constructing a continuous steel plate girder bridge, the first step is to construct the first span of the bridge. Since the bolted joint 9 is located between the two piers, the first span of the bridge is divided into a first beam 2 and a second beam 3. During construction, the first beam 2 and the second beam 3 are lowered using a bridge erecting machine 1. In this invention, the first beam 2 is lowered onto the first pier 7, and the second beam 3 is lowered onto the second pier 8. After the lowering is completed, the first beam 2 and the second beam 3 are joined and fixed together, so that the two beams form an integral structure, which is supported by the first pier 7 and the second pier 8.

[0021] Understandably, during the construction of the first span of the bridge, the bridge erecting machine 1 bears the weight of the first beam 2 and the second beam 3 until the two beams are fixed on the corresponding piers. This means that there is no need to set up temporary construction scaffolds to support and fix the first beam 2 and the second beam 3, which significantly reduces construction costs. At the same time, since the construction of the first beam 2 and the second beam 3 can be carried out simultaneously, the construction efficiency is improved.

[0022] After the construction of the first span of the bridge is completed, the construction of the subsequent spans is carried out in sequence. Each subsequent span includes a beam. The next beam in step S4 refers to the beam waiting to be lowered and adjacent to the beam that has been erected. In actual construction, the bridge erecting machine 1 is used to lift the next beam to the designated beam lowering position and lower it onto the pier used to support this beam. During this process, the bridge erecting machine 1 bears the weight of this beam and keeps it stable. After the beam is lowered, the next beam is connected and fixed to the beam that has been erected, thus completing the erection of the next beam. Therefore, it is not necessary to use temporary construction scaffolds to support and fix the next beam during the construction of the next beam.

[0023] In this embodiment, all beams are steel beams, which facilitates the splicing and fixing of adjacent beams.

[0024] Reference Figure 1 Before step S1, the abutments of the continuous steel plate girder bridge have been erected. The first pier 7 is the pier closest to the abutment, which is the starting pier of the continuous steel plate girder bridge. The second pier 8 is the adjacent pier of the first pier 7.

[0025] In this embodiment, the bridge erecting machine 1 includes a front support leg 15, a rear support leg 16, a first overhead crane 11, a second overhead crane 12, a third overhead crane 13, and a fourth overhead crane 14. During step S1, the rear support leg 16 of the bridge erecting machine 1 is installed on the bridge abutment 4, and the front support leg 15 of the bridge erecting machine 1 is installed on the second bridge pier 8. At this time, the front support leg 15 and the rear support leg 16 can provide stable support for the bridge erecting machine 1, ensuring the safe operation of the bridge erecting machine 1.

[0026] Specifically, in step S2, firstly, the second beam 3 is transported to the lifting position, and the hooks of the No. 3 overhead crane 13 and No. 4 overhead crane 14 of the bridge erecting machine 1 are used to lift the second beam 3. The two overhead cranes move to transport the second beam 3 to the lowering position, and the second beam 3 is controlled to slowly fall until the lowering is completed. After the lowering is completed, the No. 3 overhead crane 13 and No. 4 overhead crane 14 are kept in a bound state with the second beam 3. Secondly, the first beam 2 is transported to the lifting position, and the No. 1 overhead crane... The hooks of crane 11 and crane 12 lift the first beam 2. The two cranes move to transport the first beam 2 to the lowering position, controlling its slow descent until lowering is complete. After lowering, cranes 11 and 12 remain bound to the first beam 2. Then, the first beam 2 and the second beam 3 are connected and fixed by bolted joints 9 between the two beam sections. Once the first beam 2 and the second beam 3 are fixed, the cranes are untied from the beams. At this point, the first beam 2 is lowered onto the first pier 7, and the second beam 3 is lowered onto the second pier 8. The two piers support the two beam sections, ensuring structural stability. During the lifting and lowering of the beams, the bridge erecting machine 1 bears the weight of the beams and ensures their stability during construction.

[0027] During actual hoisting, the beam is equipped with multiple lifting lugs. The beam is hoisted by the hook on the overhead crane. When the beam needs to be untied, the overhead crane simply releases the hook.

[0028] In this embodiment, two overhead cranes are used to lift a beam. On the one hand, the two cranes can evenly distribute the weight of the beam, reducing the load on a single crane and ensuring the safety of construction. On the other hand, lifting a section of the beam by two cranes helps maintain the stability of the beam during the lifting process, avoiding tilting or swaying, which helps improve the accuracy of the beam being lowered and ensures the quality of construction.

[0029] In actual construction, to ensure the smooth lowering of the bridge beam, it is necessary to avoid interference from the hoisting of the beam caused by the front support leg 15 installed on the pier. Therefore, a support frame 5 is installed on the pier where the front support leg 15 needs to be installed, as shown in the figure. Figure 5 The support frame 5 includes a crossbeam 51 and two support columns 52. The crossbeam 51 is used to install the outriggers of the bridge erecting machine 1. The two support columns 52 are fixedly connected to both ends of the crossbeam 51. The support columns 52 are vertically installed on the pier and connected to the pier through detachable fasteners 6. That is, the two support columns 52 and the crossbeam 51 enclose an area that allows the bridge beam to pass through. The support frame 5 ensures the normal operation of the bridge erecting machine 1 on the one hand, and avoids interference with the lifting of the bridge beam caused by the outriggers being directly installed on the pier on the other hand.

[0030] It is important to note that during the hoisting of the beam, the height of the beam must be kept lower than the height of the crossbeam 51 of the support frame 5 to ensure that the beam can pass smoothly through the support frame 5.

[0031] In this embodiment, when the gantry crane moves to the support frame 5, the support frame 5 will obstruct the movement of the gantry crane hook. In this case, the beam can be temporarily placed on the pier, the gantry crane near the support frame 5 can disengage, and the other gantry crane can remain on the hook. The gantry crane near the support frame 5 can retract its hook and move to a position past the support frame 5, and then release its hook to re-hook the beam, which is to perform the hook change operation. Then, the two gantry cranes can be controlled to lift the beam to the beam placement position.

[0032] Reference Figures 3-4 After completing step S2, in order to erect the next beam, the position of the bridge erecting machine 1 needs to be changed, and step S3 is performed, which is the crossing operation of the bridge erecting machine 1. This refers to the process of moving the bridge erecting machine 1 from one pier to another. Specifically, the motor units of the front support leg 15 and the rear support leg 16 of the bridge erecting machine 1 drive the main beam of the bridge erecting machine 1 forward until the front auxiliary support leg 17 of the bridge erecting machine 1 supports the pier used to erect the next beam. The front support leg 15 of the bridge erecting machine 1 is retracted and the support frame 5 is disassembled. The support frame 5 is then hoisted to the pier used to erect the next beam using a crane and fixed. The front support leg of the bridge erecting machine 1 is controlled. 15 is installed on the crossbeam 51 of the support frame 5, and the front auxiliary support leg 17 is retracted. At the same time, the rear support leg 16 of the bridge erecting machine 1 is moved to support the completed beam. The specific position is determined according to the actual construction requirements. When the rear support leg 16 is retracted, the rear auxiliary support leg 18 is extended, that is, the rear auxiliary support leg 18 replaces the rear support leg 16 to support the bridge erecting machine 1 and maintain the stability of the bridge erecting machine 1. After the installation of the support leg 16 is completed, the rear auxiliary support leg 18 is retracted. Then, the motor units of the front support leg 15 and the rear support leg 16 of the bridge erecting machine 1 drive the main beam of the bridge erecting machine 1 to continue to move until the position of the main beam of the bridge erecting machine 1 meets the construction requirements.

[0033] During the bridge erecting machine 1's span-crossing operation, the support frame 5 can be reused, which helps to save construction costs.

[0034] In step S4, the next beam can be hoisted to the designated placement position by the No. 1 crane 11, No. 2 crane 12, or No. 3 crane 13 and No. 4 crane 14 of the bridge erecting machine 1. Before placement, the motor units of the front support leg 15 and the rear support leg 16 of the bridge erecting machine 1 drive the main beam of the bridge erecting machine 1 to move forward, so that the next beam is staggered with the adjacent completed beam, thereby facilitating accurate docking between the next beam and the adjacent completed beam. Then, the next beam is controlled to be placed. After placement, a bolted joint 9 is set between the next beam and the adjacent completed beam to fix them, thus completing the construction of the next beam. When constructing subsequent beams, steps S3 and S4 are repeated until the construction of the continuous steel plate girder bridge is completed.

[0035] Furthermore, step S4 also includes: S41: Lay beam transport tracks on the completed beams; S42: The next beam is transported to the designated lifting position by the beam transport vehicle via the beam transport track.

[0036] In this embodiment, the beam is transported by means of transporting the beam on the beam, which avoids obstacles that may be encountered during ground transportation or hoisting operations, reduces unnecessary transfer and dismantling processes, and makes the transportation and installation of the beam more rapid, further improving the overall construction efficiency. At the same time, since the beam used to lay the beam transport track is already in place, its stability is relatively higher, which helps to reduce safety risks during transportation.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a continuous steel plate girder bridge, used for constructing bridge sections with bolted joints located between spans, characterized in that... Includes the following steps: S1: Install the bridge erecting machine (1) at the designated location; When installing the bridge erecting machine (1) in step S1, the rear support leg (16) of the bridge erecting machine (1) is supported on the bridge abutment (4), the front support leg (15) of the bridge erecting machine (1) is supported on the second pier (8), and a first pier (7) is provided between the bridge abutment (4) and the second pier (8). S2: Construction of the first span of the bridge is carried out. The bolted joint (9) is set between the two piers. The first span of the bridge is divided into the first beam (2) and the second beam (3). The first beam (2) is placed on the first pier (7), and the second beam (3) is placed on the second pier (8). The bridge erecting machine (1) is used to lift the first beam (2) and the second beam (3) to the designated placement position for placement. After placement, the first beam (2) and the second beam (3) are spliced ​​and fixed. The first beam (2) and the second beam (3) are fixedly connected by the bolted joint (9). The bridge erecting machine (1) Including at least four overhead cranes, during step S2, the first beam (2) is hoisted by the first overhead crane (11) and the second overhead crane (12), and the second beam (3) is hoisted by the third overhead crane (13) and the fourth overhead crane (14); during the construction of the first span of the bridge, the bridge erecting machine (1) bears the weight of the first beam (2) and the second beam (3) until the two beams are fixed on the corresponding piers, that is, there is no need to set up temporary construction supports to support and fix the first beam (2) and the second beam (3); after the construction of the first span of the bridge is completed, the construction of the subsequent spans is carried out in sequence, and each subsequent span includes a beam; S3: Control the bridge erecting machine (1) to pass through the hole; S4: The bridge erecting machine (1) will lift the next beam to the designated beam placement position and place the beam thereafter. After the beam is placed, it will be spliced ​​and fixed with the adjacent beam that has been erected. S5: Repeat steps S3 and S4 until construction is complete.

2. The construction method for a continuous steel plate girder bridge according to claim 1, characterized in that, The second pier (8) is detachably connected to a support frame (5), and the front support leg (15) is installed on the support frame (5). The support frame (5) and the second pier (8) form an area that allows the second beam (3) to pass through.

3. The construction method for a continuous steel plate girder bridge according to claim 2, characterized in that, The support frame (5) includes a crossbeam (51) and two support columns (52). One end of each of the two support columns (52) is fixedly connected to both ends of the crossbeam (51), and the other end is fixed to the second pier (8) by a detachable fastener (6).

4. The construction method for a continuous steel plate girder bridge according to claim 2, characterized in that, Step S3 specifically includes: S31: Adjust the installation positions of the front support leg (15) and the rear support leg (16) according to the construction requirements; S32: Control the bridge erecting machine (1) to move along the construction direction until the position of the bridge erecting machine (1) meets the construction requirements.

5. The construction method for a continuous steel plate girder bridge according to claim 4, characterized in that, After completing step S31, the rear support leg (16) is installed on the beam that has been erected, and the front support leg (15) is installed on the pier for erecting the next beam.

6. The construction method for a continuous steel plate girder bridge according to claim 1, characterized in that, Step S4 further includes: S41: Lay beam transport tracks on the completed beams; S42: The next beam is transported to the designated lifting position by the beam transport vehicle via the beam transport track.

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