High-pier large-cantilever special-shaped structure under condition of difficult and canyon landform and construction method of high-pier large-cantilever special-shaped structure

Abstract

The invention discloses a high-pier large-cantilever special-shaped structure under the condition of the difficult canyon landform and a construction method.The high-pier large-cantilever special-shaped structure under the condition of the difficult canyon landform comprises a rigid framework, the rigid framework is connected with a pier body, an externally-hung formwork is connected to the rigid framework, and a pouring area is formed in the externally-hung formwork; the rigid framework is located in the pouring area. The rigid framework is manufactured by adopting factory segments and is high in machining precision and mounting speed, meanwhile, the rigid framework is combined with the externally-hung formwork, high-altitude professional procedures are reduced, high-altitude operation risks are reduced, multiple working faces can work at the same time, the construction progress is accelerated, in addition, traditional stressed steel bars are replaced with the rigid framework, and the construction cost is reduced. The high-altitude steel bar binding is optimized into overground and land splicing, the construction quality is guaranteed, and through the arrangement of the rigid framework, the investment of a large temporary structure is reduced, and the construction cost is saved.

Description

Technical Field

[0001] This application relates to the field of high-pier large cantilever irregular structure technology, and in particular to a high-pier large cantilever irregular structure and construction method under difficult canyon terrain conditions. Background Technology

[0002] The following construction methods are generally used for constructing super-large cantilever irregular beams in challenging canyon terrain: 1. Ground-supported construction method: Harden the ground construction site and erect high supports to construct large cantilever irregular beams; In the difficult canyon terrain, foundation treatment is difficult, the site conditions are not suitable, and the height of the ground-supported construction is more than 60 meters. The canyon area has a significant gust effect, and the support is risky! 2. The construction of large cantilever irregular beams is carried out using a high pier pre-embedded corbel design. However, the large cantilever corbel has an excessively large cantilever, making high-altitude installation difficult and posing a risk of overall instability. Furthermore, it cannot solve the construction problem of the widened end section of the large cantilever irregular beam.

[0003] 3. Segmental Construction of Large Cantilever Irregular Beams Using Hanging Baskets: Hanging baskets require a large initial investment and necessitate segmental construction. This results in complex prestressing design, a long construction period, and complex end-width sections for large cantilever irregular beams (generally, the width of the cantilever in hanging basket construction is relatively constant, allowing the basket to move freely; however, in this case, the width of the large cantilever structure changes, making conventional hanging baskets unsuitable; see reference...). Figure 1 The design of the hanging basket structure is difficult.

[0004] Traditional methods are difficult to use for constructing irregularly shaped beams with super-large cantilever arms, so a new construction method is urgently needed. Summary of the Invention

[0005] The purpose of this application is to provide a high-pier, large-cantilever irregular structure and construction method under difficult canyon terrain conditions, so as to improve the problem of difficult construction of ultra-large cantilever irregular beams under difficult canyon terrain conditions.

[0006] Firstly, this application provides a high-pier, large-cantilever irregular structure for challenging canyon terrain, employing the following technical solution: A high-pier, large-cantilever irregular structure for rugged canyon terrain includes a rigid frame connected to the pier body, an external template connected to the rigid frame, a casting area formed within the external template, and the rigid frame located within the casting area.

[0007] By adopting the above technical solutions, the rigid frame is manufactured in factory segments, which has high processing precision and fast installation speed. At the same time, the rigid frame combined with the external formwork reduces high-altitude professional procedures, reduces the risks of high-altitude operations, allows multiple work surfaces to be operated simultaneously, and speeds up the construction progress. In addition, by using the rigid frame to replace the traditional load-bearing steel bars, the high-altitude steel bar binding is optimized to ground assembly, which ensures the construction quality. The use of the rigid frame reduces the investment in temporary structures and saves construction costs.

[0008] Optionally, a steel frame is pre-embedded on the side wall of the pier, the rigid frame is welded to the steel frame, the steel frame is provided with connecting steel bars, and the rigid frame is connected to the connecting steel bars by rebar anchoring.

[0009] The above technical solution, through the combination of a steel frame and connecting reinforcing bars, enhances the connection strength between the rigid frame and the pier body. It also improves the connection strength between the large cantilever structure formed after concrete pouring and the pier body.

[0010] Optionally, the external template includes a bottom formwork, side formwork, and edge formwork. The bottom formwork is connected to the rigid frame via external tie rods. There are two sets of side formwork, which are arranged opposite each other on both sides of the rigid frame and connected by tie rods. The edge formwork is located at the end of the rigid frame away from the pier body and is connected to the rigid frame via connecting bolts.

[0011] The above technical solution facilitates the fixing of the bottom formwork and the rigid frame by using external tie rods. At the same time, the distance between the bottom formwork and the rigid frame can be controlled by the external tie rods, thereby achieving precise construction. When it is necessary to disassemble the bottom formwork, the external tie rods can be removed. The construction is relatively convenient and saves construction costs. The tie rods and connecting rods also facilitate the disassembly of the side formwork and the edge formwork.

[0012] Optionally, a cable-stayed tie rod is connected to the rigid frame, and a steel tower is connected to the pier body. The end of the cable-stayed tie rod away from the rigid frame is connected to the steel tower.

[0013] The above technical solution further increases the connection strength between the rigid frame and the pier body by using inclined cable-stayed cables. At the same time, the inclined cable-stayed cables can adjust the elevation of the rigid frame and improve the construction accuracy.

[0014] Optionally, the rigid frame is connected to a diagonal tie plate, which extends out of the casting area and is connected to the diagonal tie cable.

[0015] The above technical solution facilitates the installation of the inclined tie rods by using the inclined tie rods, and the fact that the inclined tie rods extend out of the casting area also facilitates the subsequent disassembly of the inclined tie rods.

[0016] Optionally, a prestressed cable is also connected to the rigid frame, and the end of the prestressed cable away from the rigid frame is connected to the steel tower.

[0017] By adopting the above technical solution, the prestressed cable can easily apply prestress to the large cantilever in the later stage, thus ensuring the stability of the large cantilever structure.

[0018] Optionally, a construction platform is also connected below the rigid frame, and the construction platform is equipped with two sets of railings, with a construction passage between the railings and the side formwork.

[0019] By adopting the above technical solutions, the construction platform is convenient for workers to operate on, which in turn facilitates the pouring of large cantilever structures and the disassembly of side and edge forms.

[0020] Secondly, this application provides a construction method.

[0021] A construction method for high-pier, large-cantilever, irregularly shaped structures under the aforementioned challenging canyon terrain conditions includes the following steps: S1. Utilize tower cranes to assist in the construction of high pier bodies; S2. Install the rigid frame on the top of the pier and construct the pier cap; S3. Use a tower crane to install the steel tower on the top of the pier as a whole, and use the tower crane to hoist the rigid frame, external formwork and construction platform; S4. Install the inclined tie cables and use them to adjust the elevation of the rigid frame; S5. Repeat steps S3 and S4 until all rigid frames, external formwork and construction platforms are hoisted. S6. Install prestressed cables and stack them as a whole to construct a large cantilever concrete beam structure. After the construction of the large cantilever concrete beam structure and the prestressing are completed, the external formwork, construction platform and cable tie are removed to complete the construction of the irregular high pier.

[0022] Optionally, in step S3, the rigid frame is hoisted first, followed by the bottom formwork and construction platform, and then the side formwork and edge formwork.

[0023] By using the above technical solution, the bottom formwork, construction platform, side formwork, and edge formwork can be hoisted separately, which can reduce the weight of each hoisting, thereby reducing the burden on the tower crane and allowing the use of a smaller tower crane.

[0024] Optionally, in step S3, the rigid frame, external formwork, and construction platform are first assembled into a whole, and then the whole rigid frame, external formwork, and construction platform are hoisted using a tower crane.

[0025] The above technical solution allows the rigid frame, external formwork, and construction platform to be assembled on the ground and then hoisted as a whole, which can reduce high-altitude work and improve construction efficiency.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. To address the shortcomings of traditional construction methods for super-large cantilever irregular beams in challenging canyon conditions, such as long construction cycles, high construction risks, and high construction costs, a new structural system is proposed that uses a rigid frame to replace the reinforcing steel. A new method for constructing large cantilever irregular beams is also proposed, which utilizes high-hanging towers, inclined cable ties to suspend the rigid frame, and a formwork system. This construction method has the following main characteristics. The rigid frame is manufactured in factory segments, ensuring high processing precision and rapid installation. Furthermore, the external formwork and construction platform of the rigid frame reduce the number of specialized high-altitude procedures, minimize the risks associated with working at heights, and allow for simultaneous work on multiple work surfaces, thus accelerating the construction progress. In addition, by using a rigid frame instead of traditional reinforcing steel bars, the high-altitude steel bar binding is optimized to ground assembly, which ensures construction quality. By combining the force of the cable and the rigid frame, the investment in temporary structures is reduced, and construction costs are saved. 2. By combining the steel frame with connecting reinforcing bars, the connection strength between the rigid frame and the pier body is improved. It also enhances the connection strength between the large cantilever structure formed after concrete pouring and the pier body. 3. The external tie rods facilitate the fixing of the bottom formwork and the rigid frame, and also allow for the control of the distance between the bottom formwork and the rigid frame, thereby achieving precise construction. When the bottom formwork needs to be disassembled, the external tie rods can be removed, making construction more convenient and saving construction costs. The tie rods and connecting rods also facilitate the disassembly of the side formwork and edge formwork. 4. The connection strength between the rigid frame and the pier body is further increased by the inclined cable tie. At the same time, the inclined cable tie can adjust the elevation of the rigid frame and improve the construction accuracy. 5. The inclined tie plate facilitates the installation of the inclined tie cable, and the fact that the inclined tie plate extends out of the pouring area also facilitates the subsequent disassembly of the inclined tie cable; 6. By hoisting the bottom formwork, construction platform, side formwork, and edge formwork separately, the weight of each hoisting can be reduced, which in turn reduces the burden on the tower crane, allowing for the use of a smaller tower crane; 7. The rigid frame, external formwork, and construction platform are assembled on the ground and then hoisted as a whole, which can reduce high-altitude work and improve construction efficiency. Attached Figure Description

[0027] Figure 1 This is a planar schematic diagram illustrating the widening of a large cantilever structure in the context of this background technology.

[0028] Figure 2 This is a side view schematic diagram illustrating the rigid frame, external formwork, and construction platform in this invention.

[0029] Figure 3 This is a schematic diagram illustrating the adjusting screw and adjusting sleeve in this invention.

[0030] Figure 4 This is a schematic diagram illustrating step S2 in this invention.

[0031] Figure 5 This is a schematic diagram illustrating steps S3 and S4 in this invention.

[0032] Figure 6 This is a schematic diagram illustrating the continuous hoisting of the rigid frame in this invention.

[0033] Figure 7 This is a schematic diagram illustrating the completion of the rigid frame hoisting in this invention.

[0034] In the diagram, 1. Pier body; 11. Steel frame; 12. Pier cap; 2. Rigid frame; 3. External formwork; 31. Bottom formwork; 32. Side formwork; 33. External tie rod; 34. Locking nut; 35. Tie rod; 36. Pouring area; 4. Construction platform; 41. Railing; 42. Construction access; 5. Diagonal tie cable; 51. Diagonal tie plate; 6. Steel tie tower; 61. Adjusting sleeve; 62. Adjusting screw; 7. Large cantilever structure. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Example 1 Firstly, this application discloses a high-pier, large-cantilever irregular structure under challenging canyon terrain conditions.

[0038] A high-pier, large-cantilever irregular structure for challenging canyon terrain, referencing Figure 2 , Figure 3 and Figure 5 The system includes a rigid frame 2, which is connected to the pier body 1. An external formwork 3 is attached to the rigid frame 2, forming a pouring area 36 within the external formwork 3. The rigid frame 2 is located within the pouring area 36. The rigid frame 2 is manufactured in factory segments, ensuring high processing precision and fast installation. Furthermore, the combination of the rigid frame 2 and the external formwork 3 reduces high-altitude professional procedures, lowers the risks of high-altitude operations, allows for simultaneous work on multiple work surfaces, and accelerates the construction progress. In addition, by using the rigid frame 2 instead of traditional reinforcing steel bars, the high-altitude steel bar binding is optimized to ground-based assembly, ensuring construction quality. The rigid frame 2 also reduces the investment in temporary structures, saving construction costs.

[0039] Specifically, a steel frame 11 is pre-embedded in the side wall of pier body 1, and a rigid frame 2 is welded to the steel frame 11. Connecting reinforcing bars are provided on the steel frame 11, and the rigid frame 2 is connected to the connecting reinforcing bars by rebar anchoring. The cooperation between the steel frame 11 and the connecting reinforcing bars improves the connection strength between the rigid frame 2 and pier body 1. It also improves the connection strength between the large cantilever structure 7 formed after concrete pouring and pier body 1.

[0040] The external formwork 3 includes a bottom formwork 31, side formwork 32, and edge formwork. The bottom formwork 31 is connected to the rigid frame 2 via external tie rods 33. Two sets of side formwork 32 are positioned opposite each other on both sides of the rigid frame 2 and connected by tie rods 35. The edge formwork is located at the end of the rigid frame 2 furthest from the pier body 1 and is connected to the rigid frame 2 via connecting bolts. The external tie rods 33 facilitate the fixing of the bottom formwork 31 and the rigid frame 2, and also allow for control of the distance between them, enabling precise construction. Disassembly of the bottom formwork 31 is achieved simply by removing the external tie rods 33, making construction convenient and saving costs. The tie rods 35 and connecting bolts also facilitate the disassembly of the side formwork 32 and edge formwork.

[0041] It should be noted that a construction platform 4 is also connected below the rigid frame 2. The construction platform 4 is equipped with two sets of railings 41, and a construction passage 42 is provided between the railings 41 and the side formwork 32. The construction platform 4 and the bottom formwork 31 can be connected to the rigid frame 2 together via external tie rods 33. The bottom of the external tie rod passes through the bottom formwork 31 and the construction platform 4 and is threaded with a locking nut 34. Loosening the locking nut 34 allows the bottom formwork 31 and the construction platform 4 to be disassembled. The construction platform 4 facilitates workers' operations, thereby facilitating the pouring of the large cantilever structure 7, as well as the disassembly of the side formwork 32 and the edge formwork.

[0042] In addition, a diagonal cable 5 is connected to the rigid frame 2, and a steel tower 6 is connected to the pier body 1. The end of the diagonal cable 5 away from the rigid frame is connected to the steel tower 6. The diagonal cable 5 further increases the connection strength between the rigid frame 2 and the pier body 1, and at the same time, the diagonal cable 5 can adjust the elevation of the rigid frame 2, improving construction accuracy. The diagonal cable 5 is connected to the steel tower 6 through an adjusting screw 62. An adjusting sleeve 61 is hinged on the steel tower 6, and the adjusting screw 62 is threadedly connected to the adjusting sleeve 61, facilitating the adjustment of the elevation of the rigid frame 2.

[0043] It should be noted that a diagonal tie plate 51 is fixedly connected to the rigid frame 2. The diagonal tie plate 51 extends out of the casting area 36 and is connected to the diagonal tie cable 5. The diagonal tie plate 51 facilitates the installation of the diagonal tie cable 5, and the fact that the diagonal tie plate 51 extends out of the casting area 36 also facilitates the subsequent disassembly of the diagonal tie cable 5.

[0044] In addition, prestressed cables are connected to the rigid frame 2, with the end of the prestressed cable away from the rigid frame 2 connected to the steel buckle tower 6. The prestressed cables facilitate the application of prestress to the large cantilever later, ensuring the stability of the large cantilever structure 7.

[0045] Secondly, this application provides a construction method.

[0046] One construction method, based on the aforementioned challenging canyon terrain conditions, for high-pier, large-cantilever, irregularly shaped structures, refers to... Figures 4 to 7 It includes the following steps: S1. Utilize tower cranes to assist in the construction of the high pier body 1; S2. Install rigid frame 2 on the top of the pier and construct pier cap 12; S3. A steel formwork tower 6 is installed as a whole on the top of pier 1 using a tower crane. The rigid frame 2, external formwork 3, and construction platform 4 are then hoisted using the tower crane. During hoisting, the rigid frame 2 is hoisted first, followed by the bottom formwork 31 and construction platform 4, and then the side formwork 32 and edge formwork. Hoisting the bottom formwork 31, construction platform 4, side formwork 32, and edge formwork separately reduces the weight of each hoisting operation, thus reducing the burden on the tower crane and allowing for the use of a smaller tower crane.

[0047] S4. Install the inclined cable 5 and use the inclined cable 5 to adjust the elevation of the rigid frame 2 so that the elevation of the rigid frame 2 reaches the design height.

[0048] S5. Repeat steps S3 and S4 until all rigid frames 2, external formwork 3 and construction platform 4 are hoisted.

[0049] S6. Install prestressed cables and stack them as a whole to construct a large cantilever concrete beam structure.

[0050] S7. After the construction of the large cantilever concrete beam structure and the prestressing are completed, the external formwork 3, construction platform 4 and inclined cable 5 are removed to complete the construction of the irregular high pier.

[0051] Example 2 The difference from Embodiment 1 is that in step S3, during hoisting, the rigid frame 2, the external formwork 3, and the construction platform 4 are first assembled into a whole, and then the entire rigid frame 2, external formwork 3, and construction platform 4 are hoisted using a tower crane. Assembling the rigid frame 2, external formwork 3, and construction platform 4 on the ground before hoisting them as a whole reduces high-altitude work and improves construction efficiency.

[0052] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-pier, large-cantilever irregular structure for rugged canyon terrain, characterized in that: It includes a rigid frame (2), which is connected to the pier body (1). An external template (3) is connected to the rigid frame (2), and a pouring area (36) is formed inside the external template (3). The rigid frame (2) is located in the pouring area (36).

2. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 1, characterized in that: A steel frame (11) is pre-embedded on the side wall of the pier body (1). The rigid frame (2) is welded to the steel frame (11). The steel frame (11) is provided with connecting steel bars. The rigid frame (2) is connected to the connecting steel bars by rebar anchoring.

3. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 2, characterized in that: The external template (3) includes a bottom template (31), a side template (32) and an edge template. The bottom template (31) is connected to the rigid frame (2) by an external tie rod (33). There are two sets of side templates (32), which are arranged opposite each other on both sides of the rigid frame (2). The two sets of side templates (32) are connected by tie rods (35). The edge template is located at the end of the rigid frame (2) away from the pier body (1). The edge template is connected to the rigid frame (2) by a connecting screw.

4. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 3, characterized in that: The rigid frame (2) is connected to a cable tie (5), and the pier body (1) is connected to a steel tower (6). The end of the cable tie (5) away from the rigid frame is connected to the steel tower (6).

5. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 4, characterized in that: The rigid frame (2) is connected to a diagonal tie plate (51), which extends out of the casting area (36) and is connected to the diagonal tie cable (5).

6. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 5, characterized in that: The rigid frame (2) is also connected to a prestressed cable, and the end of the prestressed cable away from the rigid frame (2) is connected to the steel buckle tower (6).

7. The high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 6, characterized in that: The rigid frame (2) is also connected to a construction platform (4), which is provided with two sets of railings (41) and a construction passage (42) between the railings (41) and the side formwork (32).

8. A construction method, based on the high-pier, large-cantilever irregular structure under challenging canyon terrain conditions as described in claim 7, characterized in that: Includes the following steps: S1. Use tower cranes to assist in the construction of high pier bodies (1); S2. Install a rigid frame (2) on the top of the pier and construct the pier cap (12); S3. Use a tower crane to install the steel buckle tower (6) on the top of the pier as a whole, and use the tower crane to hoist the rigid frame (2), the external formwork (3) and the construction platform (4); S4. Install the inclined cable (5) and use the inclined cable (5) to adjust the elevation of the rigid frame (2); S5. Repeat steps S3 and S4 until all rigid frames (2), external formwork (3) and construction platform (4) are hoisted. S6. Install prestressed cables and stack them as a whole to construct a large cantilever concrete beam structure. S7. After the construction of the large cantilever concrete beam structure and the prestressing are completed, the external formwork (3), construction platform (4) and inclined cable (5) are removed to complete the construction of the irregular high pier.

9. A construction method according to claim 8, characterized in that: In step S3, the rigid frame (2) is hoisted first, followed by the bottom formwork (31) and the construction platform (4), and then the side formwork (32) and the edge formwork are hoisted.

10. A construction method according to claim 8, characterized in that: In step S3, the rigid frame (2), the external formwork (3) and the construction platform (4) are first assembled into a whole, and then the whole rigid frame (2), the external formwork (3) and the construction platform (4) are hoisted by the tower crane.

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