Bridge high pier capping beam construction method

Abstract

The invention discloses a bridge high pier capping beam construction method, which belongs to the technical field of bridge construction, and comprises the following steps: step 1, in a pier construction process, pre-burying two groups of anchoring nails on the surfaces of two sides of a pier; secondly, vertical rails are installed on the outer sides of the bridge piers through anchoring nails; thirdly, a left half bent cap formwork and a right half bent cap formwork which are symmetrical relative to the center section in the length direction of the bent cap are prefabricated in a factory; fourthly, the left half bent cap formwork and the right half bent cap formwork are transported to the top of the pier through vertical rails on the two sides of the pier and a lifting system; fifthly, when the bent cap formwork is transported to the top of the pier, the left half bent cap formwork and the right half bent cap formwork are controlled to deflect around a first pin shaft till the bent cap formwork is horizontal through a lifting system, and steel bar binding is conducted; and 6, concrete pouring, maintenance and form removal are conducted. According to the method, the high-altitude operation time and strength can be reduced, the safety in the construction process is improved, and the method is particularly suitable for construction of ultra-large high-pier bridges.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to a construction method for a high pier capping beam of a bridge. Background Art

[0002] With the advancement of the urbanization process, the development of cities is inseparable from highway bridges, which has promoted the improvement of the construction level of highway, municipal and railway bridges. The increase in the number of vehicles has put forward higher requirements for the quality of highway bridges, and to a certain extent, has increased the construction difficulty of high piers of highway bridges. The capping beam is a stress-bearing member that connects the upper and lower parts. It is a fixed beam set at the top of the pier to support, distribute and transfer the load of the upper structure. The existing high pier capping beams require long-term high-altitude operations during the construction process, and there is a lack of a perfect construction operation platform during the initial capping beam construction process, posing a great safety hazard. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a construction method for a high pier capping beam of a bridge, which can reduce the time and intensity of high-altitude operations, improve the safety during the construction process, and is particularly suitable for the construction of super-large high pier bridges.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A construction method for a high pier capping beam of a bridge disclosed by the present invention includes the following steps: Step 1, during the construction of the pier, two groups of anchor nails are embedded on the two side surfaces of the pier. The two groups of anchor nails are symmetrical with respect to the central cross-section in the length direction of the capping beam, and the anchor nails are uniformly arranged at intervals along the vertical direction on the pier surface; Step 2, vertical tracks are installed on the outside of the pier through the anchor nails, and the vertical tracks are arranged in parallel intervals on the outside of the pier; Step 3, the left half capping beam formwork and the right half capping beam formwork that are symmetrical with respect to the central cross-section in the length direction of the capping beam are prefabricated in the factory respectively. The left half capping beam formwork and the right half capping beam formwork both include capping beam formworks, and the left half capping beam formwork and the right half capping beam formwork can be combined to form a steel bar framework integrated formwork system; Step 4, the left half capping beam formwork and the right half capping beam formwork are respectively transported to the top of the pier through the vertical tracks on both sides of the pier and the lifting system. When transporting, the bottom plane of the capping beam formwork is parallel to the pier axis. A first pin shaft is connected to the upper end of the capping beam formwork, and a roller is rotatably connected to the first pin shaft. A second pin shaft is connected to the lower end of the capping beam formwork through a clamping assembly, and a roller is rotatably connected to the second pin shaft. The roller is rotatably installed in the vertical track; Step 5, when the capping beam formwork is transported to the top of the pier, the second pin shaft is loosened through the clamping assembly, and the left half capping beam formwork and the right half capping beam formwork are respectively controlled by the lifting system to deflect around the first pin shaft until they are horizontal, and then the left half capping beam formwork and the right half capping beam formwork are closed and steel bars are tied; Step 6: Concrete pouring, curing, and form removal.

[0005] Furthermore, a fixed frame is fixed to the outer side of the capping beam formwork, and a movable frame is also slidably installed on the outer side of the capping beam formwork. The first pin shaft is rotatably connected to the movable frame, and a second telescopic device is connected between the fixed frame and the movable frame. After the left half capping beam formwork and the right half capping beam formwork are deflected to the horizontal, the left half capping beam formwork and the right half capping beam formwork are connected together by a fixed beam, and by controlling the second telescopic device, the left half capping beam formwork and the right half capping beam formwork are closed.

[0006] Furthermore, the movable frame includes two side plate beams installed on both sides of the capping beam formwork, and the two side plate beams are connected by a cross beam. The fixed beam is fixedly connected between the two cross beams of the left half capping beam formwork and the right half capping beam formwork.

[0007] Furthermore, the engaging assembly includes an engaging plate and a first telescopic device. The first telescopic device is installed on the capping beam formwork, and the output end of the first telescopic device is connected to the engaging plate. An engaging groove is provided on the engaging plate, and a square block is fixedly provided at the outer end of the second pin shaft, and the square block is engaged in the engaging groove.

[0008] Furthermore, the pier is a hollow pier, and upper through holes and lower through holes are respectively provided on the side walls of the upper and lower parts of the pier. The lifting system includes a pulling rope and a pulley. One end of the pulling rope is detachably connected to the outer end of the capping beam formwork, and the other end of the pulling rope passes through the center of the pier and the lower through hole and is then connected to a winding device. The pulley is rotatably installed inside the pier to support the pulling rope.

[0009] Furthermore, in Step 5, after the capping beam formwork is deflected to the horizontal and closed, the upper end of the pulling rope is detached from the capping beam formwork and connected to the construction platform. The construction platform is slidably matched with the vertical track, and the construction platform is lifted to the bottom of the capping beam formwork through the vertical track and the lifting system. An inclined strut is installed between the construction platform and the capping beam formwork, and the inclined strut is used to support the capping beam formwork before pouring.

[0010] Furthermore, when removing the formwork, the formwork and other components are placed on the construction platform, the inclined strut is removed, and then the formwork is transported to the bottom of the pier through the vertical track and the lifting system.

[0011] Furthermore, the vertical track is composed of multiple track sections detachably connected in series in the vertical direction. The construction method further includes Step 7. After the form removal is completed, the track sections are sequentially detached from the anchor nails one by one from top to bottom for recycling.

[0012] The beneficial effects of the present invention are as follows: A construction method for the pier cap of a bridge disclosed by the present invention divides the integrated steel bar framework formwork system into a left half pier cap formwork and a right half pier cap formwork. The left half pier cap formwork and the right half pier cap formwork can be transported to the top of the pier through the installation of vertical tracks respectively. With the cooperation of the lifting system, the rapid assembly of the integrated steel bar framework formwork system can be realized. Since the left half pier cap formwork and the right half pier cap formwork use the vertical tracks as a medium during lifting, the high-altitude operation time and intensity can be reduced, and the safety during the construction process can be improved, which is especially suitable for the construction of super-large high-pier bridges.

[0013] Adopting the method of the present invention, after the left half pier cap formwork and the right half pier cap formwork are transported, two key steps of lifting + flipping can be completed through the lifting system, which greatly improves the construction convenience. The left half pier cap formwork and the right half pier cap formwork are prefabricated in the factory, and the docking accuracy between the two can be guaranteed through the vertical tracks, thereby improving the construction efficiency.

[0014] Other advantages, objectives and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved through the following specification. Brief Description of the Drawings

[0015] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for description: Figure 1 It is a schematic structural diagram of the integrated steel bar framework formwork system; Figure 2 It is a schematic structural diagram of the left half pier cap formwork; Figure 3 For Figure 2 The enlarged view of part A in Figure 4 It is a schematic structural diagram of the left half pier cap formwork before lifting; Figure 5 It is a schematic diagram of the lifting process of the left half pier cap formwork; Figure 6 It is a schematic diagram of the left half pier cap formwork after lifting; Figure 7 It is a schematic structural diagram of the construction platform; Figure 8 It is a schematic diagram of the pulley; Figure 9 It is a schematic structural diagram of the vertical segmentation.

[0016] The markings in the attached drawings are as follows: bridge pier 1, anchor pin 2, vertical track 3, left half cover beam formwork 4, right half cover beam formwork 5, first pin shaft 6, roller 7, second pin shaft 8, fixed frame 9, movable frame 10, second telescopic device 11, side plate beam 12, cross beam 13, fixed beam 14, engaging plate 15, first telescopic device 16, engaging groove 17, square block 18, upper through hole 19, lower through hole 20, pull rope 21, pulley 22, construction platform 23, inclined strut 24, vertical segment 25. Specific implementation mode

[0017] As Figures 1 - 9 shown, a construction method for the high pier cover beam of a bridge disclosed by the present invention includes the following steps: Step 1, during the construction of the bridge pier 1, two groups of anchor pins 2 are embedded on the two side surfaces of the bridge pier 1. The two groups of anchor pins 2 are symmetrical with respect to the central cross-section in the length direction of the cover beam, that is, the two groups of anchor pins 2 are located on the two sides of the bridge pier 1, corresponding to the left half cover beam formwork 4 and the right half cover beam formwork 5 respectively. The anchor pins 2 are arranged at equal intervals along the vertical direction on the surface of the bridge pier 1, which can facilitate the subsequent installation of the vertical track 3; Step 2, the vertical track 3 is installed on the outside of the bridge pier 1 through the anchor pins 2. The lengths of the anchor pins 2 extending outside the bridge pier 1 are the same, which can ensure that the vertical track 3 remains vertical as a whole after installation and prevent the problem of unbalanced force caused by inclination. The vertical tracks 3 are arranged in parallel at intervals on the outside of the bridge pier 1 to prevent interference between the cover beam formwork and the surface of the bridge pier 1 during transportation; Step 3, the left half cover beam formwork 4 and the right half cover beam formwork 5 that are symmetrical with respect to the central cross-section in the length direction of the cover beam are prefabricated in the factory respectively. The structures of the left half cover beam formwork 4 and the right half cover beam formwork 5 are the same. Both the left half cover beam formwork 4 and the right half cover beam formwork 5 include the cover beam formwork, and their structures are completely symmetrical. The subsequent description of the cover beam formwork is the left half cover beam formwork 4, and the structure and connection method of the right half cover beam formwork 5 are symmetrical to it. Those skilled in the art can understand that the left half cover beam formwork 4 and the right half cover beam formwork 5 can be combined to form a steel bar skeleton integrated formwork system, and the complete formwork system can be used for pouring subsequently; Step 4, the left half cover beam formwork 4 and the right half cover beam formwork 5 are respectively transported from the bottom of the bridge pier 1 to the top of the bridge pier 1 through the vertical tracks 3 on both sides of the bridge pier 1 and the lifting system, that is, the left half cover beam formwork 4 corresponds to the left vertical track 3, and the right half cover beam formwork 5 corresponds to the right vertical track 3. The two can be transported simultaneously or separately. During transportation, the stability of the cover beam formwork is ensured to reduce shaking.

[0018] When the formwork for the capping beam is transported, the bottom plane of the formwork for the capping beam is parallel to the axis of the pier 1, that is, the bottom plane of the formwork for the capping beam is parallel to the axis of the pier 1. By transporting the formwork for the capping beam with its bottom plane closely attached to the vertical track 3, the swaying of the formwork for the capping beam during transportation can be reduced, thereby improving the stability. The upper end of the formwork for the capping beam is connected with a first pin shaft 6, the first pin shaft 6 is rotatably connected with a roller 7, the lower end of the formwork for the capping beam is connected with a second pin shaft 8 through a clamping component, the second pin shaft 8 is rotatably connected with a roller 7, and the roller 7 is rotatably installed in the vertical track 3; under the combined action of the first pin shaft 6 and the second pin shaft 8, the stability during transportation can be improved.

[0019] Step Five, when the formwork for the capping beam is transported to the top of the pier 1, the vertical track 3 limits the upward movement of the first pin shaft 6, the second pin shaft 8 is released through the clamping component, and the left half capping beam formwork 4 and the right half capping beam formwork 5 are respectively controlled by the lifting system to deflect around the first pin shaft 6 until horizontal. At this time, the end faces of the left half capping beam formwork 4 and the right half capping beam formwork 5 are opposite to each other, and then the left half capping beam formwork 4 and the right half capping beam formwork 5 are closed to form a complete steel bar framework integrated formwork system. Subsequently, steel bar binding is carried out. The longitudinal bars in the left half capping beam formwork 4 and the right half capping beam formwork 5 are longer than the width of the left half capping beam formwork 4, which is convenient for steel bar binding; Step Six, concrete is poured, cured, and the formwork is removed to complete the construction of the high pier capping beam.

[0020] In this embodiment, a fixed frame 9 is fixed on the outer side of the formwork for the capping beam, and a moving frame 10 is also slidably installed on the outer side of the formwork for the capping beam. The moving frame 10 can slide along the length direction of the formwork for the capping beam. The first pin shaft 6 is rotatably connected with the moving frame 10, and a second telescopic device 11 is connected between the fixed frame 9 and the moving frame 10. After the left half capping beam formwork 4 and the right half capping beam formwork 5 are deflected to the horizontal, the left half capping beam formwork 4 and the right half capping beam formwork 5 are connected together through a fixed beam 14. At this time, the fixed beam 14 and the moving frame 10 connected thereto are relatively fixed. The second telescopic device 11 is controlled to extend, and the left half capping beam formwork 4 and the right half capping beam formwork 5 displace toward the opposite sides, thereby realizing closing. In this embodiment, the second telescopic device 11 adopts a jack, and the number of the fixed beams 14 can be selected according to needs, which can ensure the stability of the device during movement.

[0021] In this embodiment, the moving frame 10 includes two side plate beams 12 installed on both sides of the formwork for the capping beam. The two side plate beams 12 are connected by a cross beam 13. The moving frame 10 and the fixed frame 9 are integrally in a rectangular frame structure. The fixed beam 14 is fixedly connected between the two cross beams 13 of the left half capping beam formwork 4 and the right half capping beam formwork 5, which is convenient for construction operations.

[0022] In this embodiment, the clamping assembly includes a clamping plate 15 and a first telescopic device 16. The first telescopic device 16 is installed on the capping beam formwork. The output end of the first telescopic device 16 is connected to the clamping plate 15. A clamping groove 17 is formed in the clamping plate 15. The clamping groove 17 is an open groove and is clamped with a square block 18 through the opening at the outer end. A square block 18 is fixedly arranged at the outer end of the second pin shaft 8, and the square block 18 is clamped in the clamping groove 17. Through the limiting effect of the clamping assembly, it can prevent the capping beam formwork from deflecting around the first pin shaft 6 during transportation, and can ensure the stability during transportation.

[0023] In this embodiment, the bridge pier 1 is a hollow bridge pier 1. Upper through holes 19 and lower through holes 20 are respectively formed in the side walls of the upper and lower parts of the bridge pier 1. The lifting system includes a pulling rope 21 and a pulley 22. One end of the pulling rope 21 is detachably connected to the outer end of the capping beam formwork. The other end of the pulling rope 21 passes through the center of the bridge pier 1 and the lower through hole 20 and is then connected to a winding device. Multiple groups of pulleys 22 can be arranged as needed, mainly for supporting at the turning positions of the pulling rope 21. The pulley 22 is rotatably installed inside the bridge pier 1 to support the pulling rope 21. The pulling rope 21 is made of a stainless steel stranded wire. By being supported by the pulley 22, the damage caused to the pulling rope 21 by friction can be reduced, and the smoothness of lifting can also be improved.

[0024] In this embodiment, in step five, after the capping beam formwork is deflected to the horizontal and closed, the upper end of the pulling rope 21 is detached from the capping beam formwork and connected to the construction platform 23. The construction platform 23 is slidably matched with the vertical track 3. The construction platform 23 is lifted to the bottom of the capping beam formwork through the vertical track 3 and the lifting system. The construction platform 23 can also facilitate the operation of construction workers, making the vertical track 3 fully utilized, reducing construction costs, and further reducing the risk of high-altitude operations. An inclined strut 24 is installed between the construction platform 23 and the capping beam formwork. The inclined strut 24 is used to support the capping beam formwork before pouring, which can facilitate subsequent pouring and ensure the structural strength of the capping beam.

[0025] In this embodiment, when demolishing the formwork, the formwork and other components are placed on the construction platform 23, the inclined strut 24 is removed, and then the formwork is transported to the bottom of the bridge pier 1 through the vertical track 3 and the lifting system, saving costs. The transportation process hardly requires the operation of construction workers, and also improves the safety during construction.

[0026] In this embodiment, the vertical track 3 is detachably connected by multiple track segments along the vertical direction 25. The construction method further includes step seven. After the formwork demolition is completed, the track segments are sequentially detached from the anchor nails 2 from top to bottom for recycling.

[0027] Finally, it should be noted that the above preferred 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 through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method for the pier cap of a high pier of a bridge, characterized in that, It includes the following steps: Step 1, during the construction of the pier, embed two groups of anchor nails on the two side surfaces of the pier. The two groups of anchor nails are symmetric with respect to the central cross-section in the length direction of the capping beam, and the anchor nails are evenly spaced along the vertical direction on the pier surface; Step 2, install vertical tracks on the outside of the pier through the anchor nails, and the vertical tracks are arranged in parallel intervals on the outside of the pier; Step 3, prefabricate the left half capping beam formwork and the right half capping beam formwork that are symmetric with respect to the central cross-section in the length direction of the capping beam in the factory. Both the left half capping beam formwork and the right half capping beam formwork include capping beam formworks, and the left half capping beam formwork and the right half capping beam formwork can be combined to form a steel bar framework integral formwork system; Step 4, transport the left half capping beam formwork and the right half capping beam formwork to the top of the pier through the vertical tracks on both sides of the pier and the lifting system respectively. When transporting, the bottom plane of the capping beam formwork is parallel to the pier axis. A first pin shaft is connected to the upper end of the capping beam formwork, and a roller is rotatably connected to the first pin shaft. The lower end of the capping beam formwork is connected to a second pin shaft through a clamping component, and a roller is rotatably connected to the second pin shaft. The roller is rotatably installed in the vertical track; Step 5, when the capping beam formwork is transported to the top of the pier, loosen the second pin shaft through the clamping component, and respectively control the left half capping beam formwork and the right half capping beam formwork to deflect around the first pin shaft until horizontal through the lifting system, and then close the left half capping beam formwork and the right half capping beam formwork and carry out steel bar binding; Step 6, concrete pouring, curing, and formwork removal.

2. A construction method for the pier cap of a high pier of a bridge according to claim 1, characterized in that, A fixed frame is fixed on the outside of the capping beam formwork, and a movable frame is also slidably installed on the outside of the capping beam formwork. The first pin shaft is rotatably connected to the movable frame, and a second telescopic device is connected between the fixed frame and the movable frame. After the left half capping beam formwork and the right half capping beam formwork deflect to the horizontal, connect the left half capping beam formwork and the right half capping beam formwork together through a fixed beam, and control the second telescopic device to realize the closing of the left half capping beam formwork and the right half capping beam formwork.

3. A construction method for a pier cap of a high pier of a bridge according to claim 2, characterized in that, The movable frame includes two side plate beams installed on both sides of the capping beam formwork, and the two side plate beams are connected by a cross beam. The fixed beam is fixedly connected between the two cross beams of the left half capping beam formwork and the right half capping beam formwork.

4. A construction method for the pier cap of a high pier of a bridge according to claim 1, characterized in that, The clamping component includes a clamping plate and a first telescopic device. The first telescopic device is installed on the capping beam formwork, and the output end of the first telescopic device is connected to the clamping plate. A clamping groove is opened on the clamping plate, and a square block is fixedly arranged at the outer end of the second pin shaft, and the square block is clamped in the clamping groove.

5. A construction method for a pier cap of a high pier of a bridge according to any one of claims 1-4, characterized in that, The pier is a hollow pier, and upper through holes and lower through holes are respectively opened on the side walls of the upper and lower parts of the pier. The lifting system includes a pull rope and a pulley. One end of the pull rope is detachably connected to the outer end of the capping beam formwork, and the other end of the pull rope passes through the center of the pier and the lower through hole and is then connected to a winding device. The pulley is rotatably installed inside the pier to support the pull rope.

6. The construction method of the pier cap of a bridge high pier according to claim 5, characterized in that, In Step 5, after deflecting the capping beam formwork to the horizontal and closing it, detach the upper end of the pull rope from the capping beam formwork and connect it to the construction platform. The construction platform is slidably matched with the vertical track, and the construction platform is lifted to the bottom of the capping beam formwork through the vertical track and the lifting system. Install diagonal braces between the construction platform and the capping beam formwork, and the diagonal braces are used to support the capping beam formwork before pouring.

7. A construction method for the pier cap of a high pier of a bridge according to claim 6, characterized in that, When removing the formwork, place the formwork and other components on the construction platform, remove the diagonal braces, and then transport the formwork to the bottom of the pier through the vertical track and the lifting system.

8. A construction method for the pier cap of a high pier of a bridge according to claim 7, characterized in that, The vertical track is composed of multiple track segments that are detachably connected in sections vertically. The construction method further includes Step 7. After the formwork removal is completed, detach the track segments from the anchor nails one by one from top to bottom for recycling.

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