Continuous beam torsion pier 0 block combined support structure

Abstract

The utility model discloses a continuous beam twists pier 0 block combination support structure belongs to bridge construction technical field. The support structure includes lower steel pipe column support system, middle part triangle bracket system and upper formwork support system. Steel pipe column consolidates with the bearing platform through the embedded part, and triangle bracket is connected with pier body embedded part, and is connected with the inclined cutting pier cap through the enhanced type bracket structure, and the upper system includes crossbeam, stringer, distribution beam and bottom mould. Construction method includes: preburied installation, steel pipe column welding, bracket installation, fine rolling screw steel tension, flat link installation, unloading block installation, beam system installation, formwork installation, 0 block pouring and removal. The utility model discloses through steel pipe column and bracket combination, converts the partial pressure of inclined surface into axial pressure, solves the pier cap stress concentration problem, adopts the modular design and pier bracket integration structure, improves construction efficiency and system stability, especially suitable for pier body twist, top cap inclined complex bridge 0 block construction.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a combined support structure for the No. 0 block of a continuous beam torsion pier, which is especially suitable for complex bridge structures with spatial torsion design of the pier body and special oblique angle shape of the top cap due to site limitations. Background Technology

[0002] In the cantilever construction of long-span continuous beam bridges and continuous rigid frame bridges, the No. 0 block located at the top of the main pier serves as the foundation and benchmark for subsequent cantilever segment construction. Its construction quality directly affects the alignment, stress state, and overall safety of the entire bridge. Traditionally, the construction of the No. 0 block often employs techniques such as ground-mounted full-span scaffolding, pier-side brackets, or steel pipe column supports.

[0003] With the development of transportation infrastructure, bridges are crossing increasingly complex environments. For example, the No. 72 main pier of the Xiaxue Grand Bridge on the Fujian section of the newly built Zhangshan High-speed Railway is located within the green belt of a national highway reconstruction and expansion project. To meet route avoidance requirements, its pier body and abutment adopted a spatial torsion design (the pier body is twisted counterclockwise by 30°), and the pier top cap is 5.5m high, forming a 55° oblique cut surface. This special geometry results in an inclined and asymmetrical pier top support surface, causing the corbel support points of the traditional triangular brackets to be located on the oblique cut surface, resulting in severe stress concentration and becoming a weak point in the structure. At the same time, the narrow construction site also limited the arrangement of large supports.

[0004] In existing technologies, full-span scaffolding requires a large site and has high requirements for foundation bearing capacity; simple triangular brackets are difficult to withstand the huge shear forces on the inclined surface, posing a risk of concrete crushing; simple steel pipe column supports have limited cantilever capacity and are difficult to adapt to the large cantilever structure of block 0. Therefore, there is an urgent need for a support structure and construction method for block 0 that can adapt to complex spatial geometry, has clear stress distribution, is safe and reliable, and is easy to implement in confined spaces. Utility Model Content

[0005] The purpose of this invention is to provide a combined support structure for the No. 0 block of a continuous beam torsion pier, in order to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides a combined support structure for block 0 of a continuous beam torsion pier, comprising:

[0007] The lower steel pipe column support system includes at least two vertically arranged steel pipe columns, the bottom of which is fixed to the foundation.

[0008] The central triangular bracket system includes an upper bracket and a lower bracket set on the pier body. The lower bracket is located on the inclined surface of the pier cap. Both the upper bracket and the lower bracket are connected to triangular brackets.

[0009] The upper formwork support system includes horizontal beams, longitudinal beams, distribution beams, and bottom formwork erected on the triangular brackets;

[0010] The steel pipe column is rigidly connected to the pier body through connectors, and the steel pipe column and the central triangular bracket system together form a spatial force-bearing system.

[0011] Preferably, the connection node between the lower corbel and the oblique section of the pier cap is a reinforced corbel structure, including a double-I-beam corbel body and shear keys and reinforcing welds set in the connection area.

[0012] Preferably, the lower steel pipe column support system further includes a pre-embedded steel plate and U-shaped steel bars disposed on the top surface of the pier cap, and the steel pipe column is welded to the pre-embedded steel plate.

[0013] Preferably, a spreader beam reinforcement system is provided at the pier cap inclined section corresponding to the lower corbel support area. The spreader beam reinforcement system is a double-limb I40b steel, and the spreader beam reinforcement system is used to transfer local loads to the steel pipe column.

[0014] Preferably, the steel pipe columns are arranged in a single row of two columns, and the two steel pipe columns are connected by multiple channel steel ties to form a spatial truss, wherein the channel steel ties are 10# channel steel.

[0015] Preferably, the triangular bracket is a modular component prefabricated in the factory and connected to the upper bracket and the lower bracket on site by bolts; the triangular brackets are connected by a horizontal brace.

[0016] Preferably, in the upper template support system, a drop block is provided between the crossbeam and the triangular bracket.

[0017] Preferably, the support structure of the bottom mold includes:

[0018] In the region below the web of the beam, a truss is arranged on the crossbeam as a longitudinal distribution beam, and the truss is an I10 I-beam.

[0019] In the area below the flange, I40b I-beams are arranged as the longitudinal beams.

[0020] Preferably, it also includes a fine-rolled threaded steel tensioning system for providing balancing tension, the fine-rolled threaded steel tensioning system including an upper fine-rolled threaded steel disposed at the upper seat plate of the triangular bracket and a lower fine-rolled threaded steel disposed at the lower seat plate of the triangular bracket.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects:

[0022] 1. The continuous beam torsion pier No. 0 block combined support structure provided by this utility model, through the reinforcement design of "steel pipe column + spreader beam", transforms the complex stress (especially shear stress) at the oblique cut pier cap into the axial pressure of the steel pipe column, which significantly reduces the stress concentration and crushing risk of the pier cap concrete and improves the joint safety factor.

[0023] 2. The steel pipe column support system of this utility model can be completely set within the pier cap area, hardly occupying any additional construction site, realizing parallel operation with surrounding projects, and is especially suitable for narrow spaces.

[0024] 3. This utility model forms an integrated spatial truss structure for the pier frame through the rigid connection between the steel pipe column and the pier body, which greatly enhances the lateral stiffness, bending resistance and torsional resistance of the support system, and can effectively resist unbalanced construction loads and wind loads.

[0025] 4. The construction mode of factory prefabrication and on-site modular assembly reduces the amount of high-altitude work and on-site welding work, making installation quick, ensuring accuracy, and effectively controlling construction quality.

[0026] 5. The combined support structure for the No. 0 block of the continuous beam torsion pier provided by this utility model provides a universal solution for the construction of the No. 0 block of bridges with torsion of the pier body and irregular shape of the top cap caused by avoiding existing lines and meeting flood control requirements, and has promotional value. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional schematic diagram of the combined support structure of this utility model.

[0029] Figure 2 This is a longitudinal section schematic diagram of the combined support structure of this utility model.

[0030] Figure 3 This is a schematic diagram of the planar layout of the combined support structure of this utility model.

[0031] Figure 4 This is a schematic diagram of the planar arrangement of the upper bracket in the combined support structure of this utility model.

[0032] Figure 5 This is a schematic diagram of the planar arrangement of the lower bracket in the combined support structure of this utility model.

[0033] Figure 6 This is a schematic diagram of the lower bracket arrangement from another perspective in the combined support structure of this utility model.

[0034] In the diagram: 1. Block 0; 2. Bottom formwork; 3. Distribution beam; 4. Longitudinal beam; 5. Crossbeam; 6. Unloading block; 7. Upper fine-rolled threaded steel bar; 8. Triangular bracket; 9. Horizontal bracing; 10. Lower corbel; 11. I-beam crossbeam; 12. Channel steel lacing strip; 13. Steel pipe column; 14. Pier body; 15. U-shaped steel bar; 16. Pier cap; 17. Truss; 18. Lower fine-rolled threaded steel bar; 19. Leveling block; 20. Connecting parts. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 6 As shown, this utility model provides a combined support structure for block 0 of a continuous beam torsion pier, comprising:

[0037] The lower steel pipe column support system includes at least two vertically arranged steel pipe columns 13, the bottom of which is fixed to the foundation 16;

[0038] The central triangular bracket system includes an upper bracket and a lower bracket 10 set on the pier body 14. The lower bracket 10 is located on the inclined surface of the pier cap. Both the upper bracket and the lower bracket 10 are connected to triangular brackets 8.

[0039] The upper formwork support system includes a horizontal beam 5, a longitudinal beam 4, a distribution beam 3, and a bottom formwork 2, all mounted on a triangular bracket 8.

[0040] Among them, the steel pipe column 13 and the pier body 14 are rigidly connected by the connector 20, and the steel pipe column 13 and the central triangular bracket system together form a spatial force-bearing system.

[0041] The scheme was further optimized so that the connection node between the lower corbel 10 and the pier cap bevel is a reinforced corbel structure, including a double-I-beam corbel body and shear keys and reinforcing welds set in the connection area.

[0042] The scheme has been further optimized. The lower steel pipe column support system also includes a pre-embedded steel plate and U-shaped steel bars 15 set on the top surface of the foundation 16, and the steel pipe column 13 is welded to the pre-embedded steel plate.

[0043] To further optimize the design, a spreader beam reinforcement system is installed at the pier cap slope corresponding to the support area of ​​the lower corbel 10. The spreader beam reinforcement system is a double-limb I40b steel, which is used to transfer local loads to the steel pipe column 13.

[0044] The scheme was further optimized so that the steel pipe columns 13 are arranged in a single row of two columns. The two steel pipe columns 13 are connected by multiple channel steel ties 12 to form a spatial truss. The channel steel ties 12 are 10# channel steel.

[0045] The design was further optimized. The triangular bracket 8 is a modular component prefabricated in the factory and connected to the upper bracket and lower bracket 10 on site by bolts; the triangular brackets 8 are connected by a flat brace 9.

[0046] To further optimize the design, a jacking block 6 is installed between the crossbeam 5 and the triangular bracket 8 in the upper formwork support system.

[0047] Further optimization of the design: The support structure for bottom mold 2 includes:

[0048] In the area below the web of the beam, a truss 17 is arranged on the crossbeam 5 as a longitudinal distribution beam. The truss 17 is an I10 I-beam.

[0049] In the area below the flange plate, I40b I-beams are arranged as longitudinal beams 4.

[0050] Further optimization of the scheme also includes a fine-rolled threaded steel tie-down system for providing balancing tension. The fine-rolled threaded steel tie-down system includes an upper fine-rolled threaded steel 7 set at the upper seat plate of the triangular bracket 8 and a lower fine-rolled threaded steel 18 set at the lower seat plate of the triangular bracket 8.

[0051] This utility model provides a construction method for the No. 0 block of a continuous beam torsion pier, which adopts the above-mentioned combined support structure and includes the following steps:

[0052] S1, construct the pier cap 16 and the pier body 14, and pre-embed steel plates and U-shaped steel bars 15 on the top surface of the pier cap 16;

[0053] S2. Weld steel pipe columns 13 onto the pre-embedded steel plate, and install channel steel lacing strips 12 between the steel pipe columns 13 and connectors 20 between the steel pipe columns 13 and the pier body 14.

[0054] S3. Install the lower bracket 10 at the beveled surface of the pier cap, and install the leveling block 19;

[0055] S4. Hoist the triangular bracket 8 and connect it with the upper bracket and lower bracket 10, and tighten the upper fine-rolled threaded steel bar 7 and the lower fine-rolled threaded steel bar 18.

[0056] S5. Install the horizontal bracing 9, unloading block 6, crossbeam 5, longitudinal beam 4, truss 17 and distribution beam 3 in sequence;

[0057] S6. Install bottom mold 2;

[0058] S7. Pour concrete for block 0;

[0059] S8. After the concrete reaches its strength, dismantle the combined support structure from top to bottom.

[0060] Example

[0061] Taking the construction of the No. 0 block of the No. 72 main pier of the Xiaxue Grand Bridge on the newly built Zhangshan High-speed Railway as an example. The pier is tall, the top surface of the pier cap is cut at a 55° angle, the No. 0 block is 12m long, the beam is high and the load is large, and the construction site is a green belt along the national highway, which is narrow and restrictive.

[0062] Step 1: Construction Preparation and Pre-embedding

[0063] Before pouring the concrete for the pier cap 16, thick steel plates and U-shaped steel bars 15 for fixing the steel pipe columns 13 are accurately pre-embedded on the top surface of the pier cap 16 according to the design location. At the same time, connectors 20 for connecting the upper and lower corbels 10 are pre-embedded at the corresponding positions of the pier body 14 and the obliquely cut pier cap.

[0064] Step 2: Install the lower steel pipe column support system

[0065] After the construction of the foundation 16 and pier 14 is completed, the pre-embedded steel plate of the foundation 16 is accurately laid out, and two Φ630×10mm steel pipe columns 13 are welded together. The two steel pipe columns 13 are connected by three No. 10 channel steels as tie bars to form a lattice column. Subsequently, I10 steel is used as shear bracing to reliably connect the steel pipe columns 13 to the completed pier 14 to form an overall stable frame.

[0066] Step 3: Install the central triangular bracket system

[0067] First, the prefabricated double-section 56b I-beam lower bracket 10 is hoisted onto the embedded part on the pier cap's inclined surface and welded in place. A steel leveling block 19 is installed on top of the lower bracket 10 to adjust its height and level. Then, a prefabricated triangular bracket 8, welded from structural steel, is hoisted into place. One end connects to the embedded part of the upper bracket on the pier body, and the other end supports the leveling block 19 on the lower bracket 10, connected with high-strength bolts. Immediately after connection, the upper and lower precision-rolled threaded steel bars 7 and 18 are installed and tensioned to create tension on the triangular bracket 8, enhancing its stability. At the position of the lower bracket 10 on the pier cap's inclined surface, a double-limb I40b steel spreader beam is installed. One end of this spreader beam is supported near the lower bracket 10, and the other end is supported on the crossbeam 5 at the top of the steel pipe column 13, achieving load transfer.

[0068] Step 4: Install the upper formwork support system

[0069] Install the unloading block 6 and the I45b I-beam crossbeam 5 on the triangular bracket 8. On the crossbeam 5, lay longitudinal beams at the designed spacing: below the web projection of block 0, closely spaced I10 I-beams at 25cm intervals serve as longitudinal distribution beams as trusses 17; in the remaining sections, the spacing is widened to 60cm. Below the flange plate, lay I40b I-beams as longitudinal beams 4, with double-layered I40b used for the cantilevered sections to enhance rigidity. Lay distribution beams 3 on the longitudinal beams 4, and finally install the bottom formwork 2. All components are securely connected to ensure overall integrity.

[0070] Step 5: Construction and demolition of block 0

[0071] After pre-stressing the support to eliminate inelastic deformation, the reinforcing bars are tied, the side formwork and prestressed ducts are installed, and the concrete for block 01 is poured. After the concrete has cured to the specified strength, some of the prestressed steel strands are tensioned. The dismantling operation is strictly carried out in the reverse order of installation, that is: first dismantle the bottom formwork 2, distribution beam 3, longitudinal beam 4 and other upper structures, then remove the precision-rolled threaded steel, remove the triangular bracket 8 and the lower corbel 10, and finally cut and dismantle the steel pipe column 13 and its connection with the pier body 14.

[0072] Through the implementation of this embodiment, the construction of block 0 of the torsion pier of a long-span continuous beam was successfully completed safely and efficiently under complex spatial geometry and narrow site conditions, verifying the effectiveness, safety and superiority of the structure and method of this utility model.

[0073] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model.

Claims

1. A combined support structure for block 0 of a continuous beam torsion pier, characterized in that, include: The lower steel pipe column support system includes at least two vertically arranged steel pipe columns (13), the bottom of which is fixed to the foundation (16); The central triangular bracket system includes an upper bracket and a lower bracket (10) set on the pier body (14). The lower bracket (10) is located on the inclined surface of the pier cap. Both the upper bracket and the lower bracket (10) are connected to a triangular bracket (8). The upper formwork support system includes a crossbeam (5), a longitudinal beam (4), a distribution beam (3), and a bottom formwork (2) mounted on the triangular bracket (8). The steel pipe column (13) and the pier body (14) are rigidly connected by a connector (20), and the steel pipe column (13) and the central triangular bracket system together form a spatial force-bearing system.

2. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, The connection node between the lower corbel (10) and the oblique section of the pier cap is an enhanced corbel structure, including a double-I-beam corbel body and shear keys and reinforcing welds set in the connection area.

3. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, The lower steel pipe column support system also includes a pre-embedded steel plate and U-shaped steel bars (15) set on the top surface of the foundation (16), and the steel pipe column (13) is welded to the pre-embedded steel plate.

4. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, A spreader beam reinforcement system is provided at the pier cap inclined section corresponding to the support area of ​​the lower corbel (10). The spreader beam reinforcement system is a double-limb I40b steel. The spreader beam reinforcement system is used to transfer local loads to the steel pipe column (13).

5. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, The steel pipe column (13) is arranged in a single row of two columns. The two steel pipe columns (13) are connected by multiple channel steel ties (12) to form a spatial truss. The channel steel ties (12) are 10# channel steel.

6. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, The triangular bracket (8) is a modular component prefabricated in the factory and is connected to the upper bracket and the lower bracket (10) on site by bolts; the triangular brackets (8) are connected by a flat brace (9).

7. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, In the upper formwork support system, a slack block (6) is provided between the crossbeam (5) and the triangular bracket (8).

8. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, The supporting structure of the bottom mold (2) includes: In the area below the web of the beam, a truss (17) is arranged on the crossbeam (5) as a longitudinal distribution beam, the truss (17) being an I10 I-beam; In the area below the flange, I40b I-beams are arranged as the longitudinal beams (4).

9. The combined support structure for the 0th block of the continuous beam torsion pier according to claim 1, characterized in that, It also includes a threaded steel bar tie system for providing balancing tension, the threaded steel bar tie system including an upper threaded steel bar (7) disposed on the upper seat plate of the triangular bracket (8) and a lower threaded steel bar (18) disposed on the lower seat plate of the triangular bracket (8).

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