Construction method of large-angle Y-shaped pier simple support

Abstract

This invention relates to the field of Y-shaped bridge pier construction, specifically to a simple support construction method for large-angle Y-shaped piers. The pouring of the large-angle Y-shaped pier is divided into three sections, and the pier formwork and disc-lock scaffolding are reused during construction. This invention employs a simple support system composed of disc-lock scaffolding and steel pipe supports, combined with box-shaped pier formwork with tie-and-anchor devices, which can meet the construction requirements of Y-shaped piers. The support system is simple, and construction is convenient and fast; moreover, the pier formwork and supports can be reused, resulting in lower support and steel pipe pile usage, effectively saving steel consumption during construction and reducing costs.

Description

Technical Field

[0001] This invention relates to the field of Y-shaped bridge pier construction, specifically to a simple support construction method for large-angle Y-shaped piers with reusable pier body formwork. Background Technology

[0002] Y-shaped piers exhibit multiple advantages in bridge engineering, combining mechanical rationality, spatial adaptability, and aesthetic value. In recent years, they have been widely used in long-span bridges, urban bridges, and projects with high structural performance requirements. The Y-shaped pier's exterior is Y-shaped along the bridge direction. Its construction is technically challenging and complex, requiring high standards of quality control and precision. Therefore, it is necessary to explore and research its construction techniques and processes to provide reference and experience for the construction of similar bridges.

[0003] Large-angle Y-shaped piers refer to Y-shaped piers with an angle greater than 45 degrees between the Y-limb and the vertical direction. At present, the common temporary support for the construction of large-angle Y-shaped piers is a combination system of steel pipe piles with rigid steel pipe supports and triangular frames. The steel pipe supports are tightly welded to the steel pipe piles in the vertical and horizontal directions to form a stable frame to resist the horizontal load generated by the side formwork during concrete pouring. This type of system uses a large amount of steel, is expensive, and has many procedures, and has high requirements for rigidity and stability. Summary of the Invention

[0004] The purpose of this invention is to address the technical problems existing in the above-mentioned existing methods by providing a simplified support construction method for large-angle Y-shaped piers. A simplified support mode combining conventional disc-lock scaffolding and steel pipe supports is adopted. Self-balancing of the load pressing on the sidewalls of the formwork during concrete pouring is achieved through tie-anchoring devices on the pier formwork. This method divides the pouring of the Y-shaped pier into three sections, and the pier formwork and disc-lock scaffolding can be reused during the construction period.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A simple scaffolding construction method for large-angle Y-shaped piers divides the pouring of the large-angle Y-shaped pier into three sections. The pier formwork and disc-lock scaffolding are reused during construction. The specific steps include:

[0007] The first step is to erect steel pipe piles and a construction platform at sea. Based on the existing pier cap, erect the vertical steel formwork diagonal bracing of the Y-shaped pier, erect the vertical formwork of the Y-shaped pier and set the tie rods for the vertical steel formwork of the Y-shaped pier. Then, erect the first section of steel pipe support on the pier cap, and at the same time, erect the first section of disc-lock scaffolding on the construction platform. Next, erect the steel formwork required for the first section of the pier's inclined leg on the disc-lock scaffolding and steel pipe support. Set the tie rods for the first section of the pier's inclined leg formwork. Finally, pour the first section of concrete.

[0008] The second step is to wait for the concrete strength of the first segment to increase and meet the requirements, then remove the disc-lock scaffold and pier formwork of the first segment, and retain the two steel pipe supports of the first segment as temporary supports for the inclined legs of the first segment pier.

[0009] The third step is to reuse the first segment of the disc-lock scaffold and erect the second segment of the disc-lock scaffold on the offshore construction platform. At the same time, the second segment of the steel pipe support is erected. Then, reuse the first segment of the pier formwork and erect the second segment of the pier formwork on the second segment of the disc-lock scaffold and the second segment of the steel pipe support. The second segment of the steel formwork tie rod is set on the pier inclined leg formwork. Finally, the second segment of concrete is poured.

[0010] The fourth step is to remove the second segment's disc-lock scaffold and pier formwork once the concrete strength of the second segment's pier meets the requirements, while retaining the two steel pipe supports erected on the second segment as temporary supports for the pier's inclined legs.

[0011] The fifth step involves reusing the first and second segment disc-lock scaffolds to erect the third segment disc-lock scaffold on the offshore construction platform, while simultaneously erecting the third segment steel pipe support. Then, the third segment pier formwork is erected on the disc-lock scaffold and steel pipe piles. Tie rods for the third segment steel formwork are installed on the pier inclined leg formwork. Finally, the third segment concrete is poured.

[0012] Step 6: Once the concrete strength of the third pier segment meets the requirements, remove the disc-lock scaffold and pier formwork of the third segment, and retain the two steel pipe supports erected on the third segment as temporary supports for the inclined legs of the third pier segment.

[0013] The tie rods of the vertical steel formwork of the Y-shaped pier, the tie rods of the first section of the steel formwork, the tie rods of the second section of the steel formwork, and the tie rods of the third section of the steel formwork are all M25 tie rods.

[0014] The first segment of steel pipe support is Φ630×10mm, with two pipes arranged laterally at each Y-shaped pier support; the second segment of steel pipe support is Φ800×10mm, with two pipes arranged laterally at each Y-shaped pier support; the third segment of steel pipe support adopts a four-limb lattice column structure, with each limb steel pipe being Φ630×10mm, and two pipes arranged laterally at each Y-shaped pier support.

[0015] The large-angle Y-shaped pier refers to a Y-shaped pier where the angle between the Y-limb and the vertical direction is greater than 45 degrees.

[0016] This invention aims to provide a simple support construction method that meets the stress requirements of Y-shaped pier construction. The method adopts a simple support system composed of disc-lock scaffolds and steel pipe supports, combined with box-shaped pier formwork with tie anchor devices, which can meet the construction requirements of Y-shaped piers. The support system is simple and construction is convenient and fast. Moreover, the pier formwork and scaffolds can be recycled, and the amount of scaffolds and steel pipe piles used is low, which effectively saves steel consumption during construction and reduces costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a Y-shaped pier bridge structure.

[0018] Figure 2 Schematic diagram of segment division during Y-shaped pier pouring:

[0019] Figure 3 Schematic diagram of the first segment of the Y-shaped pier's formwork erection stage;

[0020] Figure 4 A schematic diagram of the stage where the scaffolding is removed after the first segment of concrete pouring for the Y-shaped pier is completed;

[0021] Figure 5 Schematic diagram of the formwork erection stage for the second segment of the Y-shaped pier;

[0022] Figure 6 A schematic diagram of the stage where the scaffolding is removed after the concrete pouring of the second segment of the Y-shaped pier is completed;

[0023] Figure 7 Schematic diagram of the scaffolding and formwork erection stage for the third segment of the Y-shaped pier;

[0024] Figure 8 A schematic diagram of the stage where the scaffolding is removed after the concrete pouring of the third segment of the Y-shaped pier is completed;

[0025] In the diagram: 1-First segment, 2-Second segment, 3-Third segment, 4-Pile foundation, 5-Pile cap, 6-Steel pipe pile, 7-Construction platform, 8-Steel formwork bracing for the vertical section of the Y-shaped pier, 9-Tie rods for the vertical section of the Y-shaped pier's steel formwork, 10-First segment disc-lock scaffold, 11-First segment steel pipe support, 12-First segment pier formwork, 13-Tie rods for the steel formwork of the second segment, 14-Second segment disc-lock scaffold, 15-Second segment steel pipe support, 16-Second segment pier formwork, 17-Tie rods for the steel formwork of the second segment, 18-Third segment disc-lock scaffold, 19-Third segment steel pipe support, 20-Third segment pier formwork, 21-Tie rods for the steel formwork of the third segment. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example

[0028] like Figure 1 As shown, the span arrangement of a certain sea-based Y-shaped pier bridge is 70+100+70=240m. The superstructure is a prestressed concrete single-box four-cell integral box girder structure. Y-shaped main piers are set on both sides of the central main span. The angle between the inclined legs of the Y-shaped piers and the vertical direction is a large angle of 65 degrees. The foundations of each pier are pile foundation cap structures.

[0029] like Figure 2 As shown, the pouring of the large-angle Y-shaped pier is divided into 3 sections. The pier formwork and disc-lock scaffolding are reused during construction. The specific steps include:

[0030] First step, such as Figure 3 As shown, steel pipe piles and construction platform 7 are erected at sea. Based on the already constructed pier cap 5, steel formwork diagonal bracing 8 is erected for the vertical part of the Y-shaped pier. The vertical formwork of the Y-shaped pier is erected and tie rods 9 are set for the vertical part of the Y-shaped pier steel formwork. Then, the first section of steel pipe support 11 is erected on the pier cap 5. At the same time, the first section of disc buckle scaffolding 10 is erected on the construction platform 7. Then, the steel formwork required for the first section of the pier's inclined leg is erected on the disc buckle scaffolding and steel pipe support. Tie rods 13 for the first section of the pier's inclined leg formwork are set for the first section of the steel formwork. Finally, the first section of concrete is poured.

[0031] The second step, as Figure 4 As shown, once the concrete strength of the first segment increases and meets the requirements, the first segment disc buckle scaffold 10 and the pier formwork are removed, while the two first segment steel pipe supports 11 erected in the first segment are retained as temporary supports for the inclined legs of the first segment pier.

[0032] The third step, as Figure 5 As shown, the first segment of the disc-lock scaffold is reused, and the second segment of the disc-lock scaffold 14 is erected on the offshore construction platform 7. At the same time, the second segment of the steel pipe support 15 is erected. Then, the first segment of the pier formwork is reused, and the second segment of the pier formwork 16 is erected on the second segment of the disc-lock scaffold 14 and the second segment of the steel pipe support 15. The second segment of the steel formwork tie rod 17 is set on the pier inclined leg formwork. Finally, the second segment of concrete is poured.

[0033] Step four, as Figure 6 As shown, once the concrete strength of the second pier segment meets the requirements, the second pier segment disc-lock scaffold 14 and the pier formwork will be removed, while the two steel pipe supports erected in the second segment will be retained as temporary supports for the inclined legs of the second pier segment.

[0034] Fifth step, as Figure 7As shown, the first and second sections of the disc-lock scaffold are reused to erect the third section of the disc-lock scaffold 18 on the offshore construction platform 7. At the same time, the third section of the steel pipe support 19 is erected. Then, the third section of the pier formwork 20 is erected on the disc-lock scaffold and the steel pipe pile. The third section of the steel formwork tie rod 21 is set on the pier inclined leg formwork. Finally, the third section of concrete is poured.

[0035] Step 6, as follows Figure 8 As shown, once the concrete strength of the third pier segment meets the requirements, the disc-lock scaffold and pier formwork of the third segment will be removed, and the two steel pipe supports erected in the third segment will be retained as temporary supports for the inclined legs of the third pier segment.

[0036] The tie rods 9, 13, 17, and 21 of the vertical steel formwork of the Y-shaped pier are all M25 tie rods.

[0037] The first segment steel pipe support 11 is Φ630×10mm, with two horizontally arranged at each Y-shaped pier support; the second segment steel pipe support 15 is Φ800×10mm, with two horizontally arranged at each Y-shaped pier support; the third segment steel pipe support 19 adopts a four-limb lattice column structure, with each limb steel pipe being Φ630×10mm, and two horizontally arranged at each Y-shaped pier support.

[0038] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A simple support construction method for a large-angle Y-shaped pier, characterized in that, The pouring of the large-angle Y-shaped pier was divided into three sections. The pier formwork and disc-lock scaffolding were reused during construction. The specific steps included: The first step is to erect steel pipe piles and a construction platform at sea. Based on the existing pier cap, erect the vertical steel formwork diagonal bracing of the Y-shaped pier, erect the vertical formwork of the Y-shaped pier and set the tie rods for the vertical steel formwork of the Y-shaped pier. Then, erect the first section of steel pipe support on the pier cap, and at the same time, erect the first section of disc-lock scaffolding on the construction platform. Next, erect the steel formwork required for the first section of the pier's inclined leg on the disc-lock scaffolding and steel pipe support. Set the tie rods for the first section of the pier's inclined leg formwork. Finally, pour the first section of concrete. The second step is to wait for the concrete strength of the first segment to increase and meet the requirements, then remove the disc-lock scaffold and pier formwork of the first segment, and retain the two steel pipe supports of the first segment as temporary supports for the inclined legs of the first segment pier. The third step is to reuse the first segment of the disc-lock scaffold and erect the second segment of the disc-lock scaffold on the offshore construction platform. At the same time, the second segment of the steel pipe support is erected. Then, reuse the first segment of the pier formwork and erect the second segment of the pier formwork on the second segment of the disc-lock scaffold and the second segment of the steel pipe support. The second segment of the steel formwork tie rod is set on the pier inclined leg formwork. Finally, the second segment of concrete is poured. The fourth step is to remove the second segment's disc-lock scaffold and pier formwork once the concrete strength of the second segment's pier meets the requirements, while retaining the two steel pipe supports erected on the second segment as temporary supports for the pier's inclined legs. The fifth step involves reusing the first and second segment disc-lock scaffolds to erect the third segment disc-lock scaffold on the offshore construction platform, while simultaneously erecting the third segment steel pipe support. Then, the third segment pier formwork is erected on the disc-lock scaffold and steel pipe piles. Tie rods for the third segment steel formwork are installed on the pier inclined leg formwork. Finally, the third segment concrete is poured. Step 6: Once the concrete strength of the third pier segment meets the requirements, remove the disc-lock scaffold and pier formwork of the third segment, and retain the two steel pipe supports erected on the third segment as temporary supports for the inclined legs of the third pier segment.

2. The construction method for a simple support structure for a large-angle Y-shaped pier according to claim 1, characterized in that, The tie rods of the vertical steel formwork of the Y-shaped pier, the tie rods of the first section of the steel formwork, the tie rods of the second section of the steel formwork, and the tie rods of the third section of the steel formwork are all M25 tie rods.

3. The construction method for a simple support structure for a large-angle Y-shaped pier according to claim 1, characterized in that, The first segment of steel pipe support is Φ630×10mm, with two pipes arranged laterally at each Y-shaped pier support; the second segment of steel pipe support is Φ800×10mm, with two pipes arranged laterally at each Y-shaped pier support; the third segment of steel pipe support adopts a four-limb lattice column structure, with each limb steel pipe being Φ630×10mm, and two pipes arranged laterally at each Y-shaped pier support.

4. A simple support construction method for a large-angle Y-shaped pier according to any one of claims 1 to 3, characterized in that, The large-angle Y-shaped pier refers to a Y-shaped pier where the angle between the Y-limb and the vertical direction is greater than 45 degrees.

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