A construction method for outer concrete wrapping of the arch ring of a rigid skeleton concrete arch bridge

Abstract

The present application discloses a method for constructing an arch ring of a rigid skeleton concrete arch bridge with external concrete, which includes assembling a skeleton unit and a formwork system, constructing the arch ring skeleton, installing the formwork system, and pouring the external concrete: installing a bottom formwork platform at the bottom of the skeleton unit, and setting two side formworks on the surface of the bottom formwork platform, with the two side formworks respectively located on the two outer sides of the skeleton unit, and the gap between the side formworks and the skeleton unit serving as a safety passage; first completing the construction of the arch foot solid section, and then synchronously hoisting the skeleton unit from the two arch foot positions of the arch ring, and completing the closing construction at the arch top position; removing the connection restriction between the side formworks and the bottom formwork platform, and installing the side formworks on the side of the skeleton unit; the present application has the effect of improving the skeleton assembly efficiency and improving the construction safety.

Description

Technical Field

[0001] The present application relates to the technical field of bridge arch ring construction, and in particular to a method for constructing a rigid skeleton concrete arch bridge arch ring with outwrapped concrete. Background Art

[0002] An arch bridge is a bridge that uses an arch ring as its main load-bearing component. Bridges built in areas with relatively large height differences such as mountains and river valleys are mostly steel tube concrete rigid skeleton arch bridges, which are cast in sections using concrete.

[0003] In the related technology, during the construction of steel tube concrete rigid frame arch bridge, the rigid frame units are first erected one by one, and then the arch ring outer formwork installation steps are completed at high altitude, the bottom formwork, side formwork and top formwork are installed, and finally the concrete pouring construction is completed.

[0004] To sum up, after the rigid frame is erected, installing the formwork at high altitude is not only difficult and inefficient, but also has extremely high safety risks. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to improve the efficiency of skeleton assembly and enhance construction safety, the present application provides a method for constructing a rigid skeleton concrete arch bridge arch ring with outwrapped concrete.

[0006] The present application provides a method for constructing a rigid skeleton concrete arch bridge arch ring with external concrete wrapping, which adopts the following technical solution:

[0007] A construction method for outer-wrapping concrete for an arch ring of a rigid skeleton concrete arch bridge comprises the following steps:

[0008] S1: Assemble the skeleton unit and formwork system: Install the bottom formwork platform at the bottom of the skeleton unit, and set two side formworks on the surface of the bottom formwork platform. The two side formworks are located on both sides of the skeleton unit. The gap between the side formworks and the skeleton unit serves as a safe passage.

[0009] S2: Arch ring skeleton construction: First, complete the construction of the arch foot solid section, then simultaneously hoist the skeleton units from the two arch foot positions of the arch ring, and complete the closing construction at the arch crown position;

[0010] S3: Formwork system installation: remove the connection restrictions between the side formwork and the bottom formwork platform, and install the side formwork on the side of the frame unit;

[0011] S4: pouring of exterior concrete.

[0012] By adopting the above technical solution, the side formwork and bottom formwork platform in the formwork system are pre-installed on the skeleton unit. At the same time, a safe passage for construction workers to walk is formed between the side formwork and the skeleton unit. The side formwork serves as a barrier with a large coverage area, which improves the construction safety of construction workers when docking the skeleton unit. At the same time, during the formwork assembly process, the side formwork can be directly installed on the side of the skeleton unit by removing the connection restriction between the bottom formwork platform and the side formwork, thereby completing the installation of the formwork system. This can reduce the side formwork hoisting operation while improving construction safety, which is conducive to improving installation efficiency.

[0013] Preferably, the bottom formwork platform includes a bottom formwork and several transverse distribution beams arranged on the lower end surface of the bottom formwork, the several transverse distribution beams are spaced apart along the bridge direction, the two ends of the transverse distribution beams respectively protrude from both sides of the skeleton unit, and several sliders are provided on the lower side of the side formwork, and the several sliders are respectively slidably connected in the gap between each two adjacent transverse distribution beams.

[0014] By adopting the above technical solution, the transverse distribution beam not only improves the structural strength of the bottom formwork, but also serves as a support platform for the safety passage. At the same time, a slideway is formed between adjacent transverse distribution beams for the side formwork slider to slide, so that the side formwork can slide smoothly without the need for the side formwork to be aligned, further improving the construction efficiency of the arch ring and shortening the construction period.

[0015] Preferably, the bottom formwork platform further includes two support plates, which are respectively located on both sides of the skeleton unit, and the support plates are laid on the upper surfaces of several transverse distribution beams, and the support plates are located between the side formwork and the skeleton unit on the same side.

[0016] By adopting the above technical solution, construction workers can walk on the support plate, which is conducive to improving construction safety.

[0017] Preferably, the transverse distribution beam is an I-beam, and the slider is slidably connected in a groove formed by the flange plate and the web plate in the transverse distribution beam.

[0018] The adoption of the above technical solution is beneficial to improving the sliding stability of the side formwork.

[0019] Preferably, a plurality of limit blocks are provided on the lower end surface of the support plate, and the limit blocks are respectively stuck in the gaps between adjacent transverse distribution beams.

[0020] By adopting the above technical solution, the gap between the limit block and the adjacent distribution beam is engaged, thereby improving the stability of the support plate on the transverse distribution beam, reducing the probability of the support plate sliding, and helping to improve construction safety.

[0021] Preferably, the bottom formwork platform further comprises a plurality of longitudinal distribution beams arranged on the lower end surface of the bottom formwork, the plurality of longitudinal distribution beams are distributed at intervals in the transverse direction, and the sliding range of the side formwork is between the two longitudinal distribution beams on the same side.

[0022] By adopting the above technical solution, the longitudinal distribution beam not only improves the overall strength of the bottom formwork platform, but also limits the sliding distance of the side formwork, which is beneficial to reduce the probability of the side formwork detaching from the bottom formwork platform during the lifting process.

[0023] Preferably, the support plate and the transverse distribution beam are fixed by screws.

[0024] The adoption of the above technical solution is conducive to improving the stability of the support plate and the bottom formwork platform. After all the skeleton units are docked, the side formwork restrictions are released by removing the screws and separating the support plate from the transverse distribution beam to facilitate the installation of the side formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the arch ring of a rigid skeleton concrete arch bridge according to an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of a safety passage formed by the side formwork and the side of the skeleton unit in a construction method for outsourcing concrete to the arch ring of a rigid skeleton concrete arch bridge in an embodiment of the present application.

[0027] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0028] Figure 4 It is a schematic diagram of a safety passage formed by the side formwork and the side of the skeleton unit in the construction method of the arch ring of a rigid skeleton concrete arch bridge wrapped with concrete.

[0029] Explanation of the accompanying reference numerals: 1. Skeleton unit; 2. Side formwork; 3. Bottom formwork platform; 31. Bottom formwork; 32. Longitudinal distribution beam; 33. Transverse distribution beam; 4. Support plate; 41. Limit block; 5. Safety passage. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The present application discloses a method for constructing a rigid skeleton concrete arch bridge arch ring with concrete wrapping. The method comprises the following steps:

[0032] S1: Assemble skeleton unit 1 and template system.

[0033] Reference Figure 1 and Figure 2The formwork system includes a bottom formwork platform 3, a side formwork 2 and a top formwork, wherein the bottom formwork platform 3 includes a bottom formwork 31, a plurality of longitudinal distribution beams 32 and a plurality of transverse distribution beams 33. The transverse distribution beams 33 and the longitudinal distribution beams 32 are both I-beams. The plurality of longitudinal distribution beams 32 are fixed on the upper surfaces of the plurality of transverse distribution beams 33, and the bottom formwork 31 is fixed on the upper surfaces of the plurality of longitudinal distribution beams 32. The transverse distribution beams 33 and the longitudinal distribution beams 32 form a steel frame at the lower end surface of the bottom formwork 31, which is beneficial to improving the strength of the bottom formwork 31.

[0034] The skeleton unit 1 and the longitudinal distribution beam 32 are locked, so that the bottom mold platform 3 is installed at the bottom of the skeleton unit 1.

[0035] The two ends of the transverse distribution beam 33 protrude from both sides of the skeleton unit 1 respectively, and the two side formworks 2 are respectively erected on both sides of the skeleton unit 1. A number of sliders 21 are fixed to the lower side of the side formwork 2. The sliders 21 are respectively slidably connected in the gap between each adjacent two transverse distribution beams 33. The sliders 21 extend to both sides to the grooves formed by the flange plates and the web plates in the transverse distribution beam 33, so that the sliders 21 can slide stably along the length direction of the transverse distribution beam 33. In addition, the sliding range of the side formwork 2 is limited to between the two adjacent longitudinal distribution beams 32 at the far end of the skeleton unit 1, which is beneficial to reduce the probability of the side formwork 2 and the transverse distribution beam 33 being detached.

[0036] Reference Figure 2 and Figure 3 The bottom formwork platform 3 also includes two support plates 4, which are located on both sides of the skeleton unit 1. The support plates 4 are laid on the upper surface of several transverse distribution beams 33 and are fixed to the support plates 4 and the transverse distribution beams 33 by screws to allow construction workers to walk smoothly, thereby facilitating the docking of the skeleton unit 1. The support plates 4 are arranged between the two longitudinal distribution beams 32 at the far end of the skeleton unit 1. At the same time, the side of the support plate 4 away from the skeleton unit 1 presses the side formwork 2 against the inner side of the longitudinal distribution beam 32 at the farthest end of the skeleton unit 1 to stabilize the side formwork 2. At the same time, the gap between the side formwork 2 and the skeleton unit 1 serves as a safe passage 5 for construction workers to walk. In addition, in order to improve the stability of the support plate 4, a number of limit blocks 41 are fixed to the lower end surface of the support plate 4, and the limit blocks 41 are respectively stuck in the gaps between adjacent transverse distribution beams 33.

[0037] S2: Arch ring skeleton construction; first complete the construction of the arch foot solid section, then carry out the synchronous hoisting construction of the skeleton unit 1 from the two arch foot positions of the arch ring, and complete the closing construction at the arch top position.

[0038] S3: Template system installation.

[0039] Reference Figure 3 and Figure 4After all the skeleton units 1 are assembled, the screws on the support plates 4 are removed one by one, and then the support plates 4 are disassembled from the transverse distribution beams 33. Then, the side formwork 2 is moved toward the skeleton unit 1 by traction equipment such as a jack or a winch. Then, steel bars are tied between the inner side of the side formwork 2 and the skeleton. A steel member is provided at the bottom of the side formwork 2 for welding and fixing with the longitudinal distribution beams 32, so that the side formwork 2 is firmly fixed on the side of the skeleton unit 1 and the surface of the bottom formwork platform 3. Then, the gaps between the side formworks 2 of adjacent skeleton units 1 are filled to finally form a complete arch ring side formwork system.

[0040] S4: pouring of exterior concrete.

[0041] The finished concrete is poured into the formwork through a remote ground pump and vibrated at the same time. As the concrete level rises, the top formwork is installed in time to achieve sealing, and finally the arch ring outer concrete pouring construction steps are completed. Among them, the collapse of the pumped concrete should be as small as possible to avoid segregation and water seepage of the concrete during the vibration process.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction method for outer concrete covering of the arch ring of a rigid skeleton concrete arch bridge, characterized by: The following steps are involved: S1: Assembling the skeleton unit (1) and the template system: installing the bottom template platform (3) at the bottom of the skeleton unit (1), setting two side templates (2) on the surface of the bottom template platform (3), and the two side templates (2) are respectively located on the two outer sides of the skeleton unit (1), and the gap between the side templates (2) and the skeleton unit (1) serves as a safety passage (5); S2: Arch ring skeleton construction: First, complete the construction of the arch foot solid section, then carry out the simultaneous hoisting construction of the skeleton unit (1) from the two arch foot positions of the arch ring, and complete the closing construction at the arch top position; S3: Formwork system installation: remove the connection restriction between the side formwork (2) and the bottom formwork platform (3), and install the side formwork (2) on the side of the frame unit (1); S4: pouring of exterior concrete.

2. The construction method for outer-wrapping concrete for the arch ring of a rigid skeleton concrete arch bridge according to claim 1 is characterized by: The bottom mold platform (3) includes a bottom mold plate (31) and a plurality of transverse distribution beams (33) arranged on the lower end surface of the bottom mold plate (31), wherein the plurality of transverse distribution beams (33) are spaced apart along the bridge direction, and the two ends of the transverse distribution beams (33) respectively protrude from both sides of the skeleton unit (1), and a plurality of sliders (21) are arranged on the lower side of the side mold plate (2), and the plurality of sliders (21) are respectively slidably connected in the gap between two adjacent transverse distribution beams (33).

3. The construction method for outer concrete covering of the arch ring of a rigid skeleton concrete arch bridge according to claim 2 is characterized in that: The bottom formwork platform (3) further comprises two support plates (4), the two support plates (4) being respectively located on both sides of the skeleton unit (1), the support plates (4) being laid on the upper surfaces of a plurality of transverse distribution beams (33), and the support plates (4) being located between the side formwork (2) and the skeleton unit (1) on the same side.

4. The construction method for outer-wrapping concrete for the arch ring of a rigid skeleton concrete arch bridge according to claim 3 is characterized by: The transverse distribution beam (33) is an I-beam, and the slider (21) is slidably connected in a groove formed by a flange plate and a web plate in the transverse distribution beam (33).

5. The construction method for outer concrete covering of the arch ring of a rigid skeleton concrete arch bridge according to claim 4 is characterized in that: The lower end surface of the support plate (4) is provided with a plurality of limit blocks (41), and the plurality of limit blocks (41) are respectively clamped in the gaps between adjacent transverse distribution beams (33).

6. The construction method for outer-wrapping concrete for the arch ring of a rigid skeleton concrete arch bridge according to claim 5, characterized in that: The bottom mold platform (3) also includes a plurality of longitudinal distribution beams (32) arranged on the lower end surface of the bottom mold plate (31), the plurality of longitudinal distribution beams (32) are distributed at intervals in the transverse direction, and the sliding range of the side mold plate (2) is between the two longitudinal distribution beams (32) on the same side.

7. The construction method for outer-wrapping concrete for the arch ring of a rigid skeleton concrete arch bridge according to claim 3 is characterized by: The support plate (4) and the transverse distribution beam (33) are fixed by screws.

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