Bridge pier rapid construction method

Abstract

This application relates to a rapid construction method for bridge piers, belonging to the field of bridge construction technology. The rapid construction method for bridge piers includes the following steps: Construction preparation; reinforcement installation, using a roll welding machine to weld a reinforcement cage with multiple reinforcing stirrups; installing at least two layers of guy ropes on the reinforcement cage, with a spacing of no less than 6 meters between adjacent layers; then using hoisting equipment to hoist and rotate the reinforcement cage vertically with a dual-point coordinated lifting mechanism. The main lifting point is located at the first reinforcing stirrup of the reinforcement cage, and the secondary lifting point is located at one-third of the distance from the other end of the reinforcement cage. The guy ropes are used for aerial positioning and stabilization. Next, the reinforcement cage is aligned and fixed, with the lower end of the guy ropes providing a counter-tension anchor point through a ground anchor structure. After the reinforcement cage is fixed, the lifting points are removed. This application has the advantages of ensuring the accuracy of reinforcement cage connection and improving construction efficiency to a certain extent.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a rapid construction method for bridge piers. Background Technology

[0002] Bridge piers are key load-bearing components of the bridge substructure, situated between the superstructure and the foundation, playing a crucial role in transferring loads and ensuring the bridge's height and alignment. Pier construction is a critical step in bridge construction, and traditional pier construction mainly includes steps such as construction preparation, reinforcement installation, formwork installation, concrete pouring, and concrete curing.

[0003] Currently, during the installation of reinforcing bars, for reinforcing cages longer than 12m, the large length makes temporary aerial fixation during hoisting difficult and prone to swaying, affecting the accuracy of connection and construction efficiency. Summary of the Invention

[0004] To help solve the problems of difficulty in temporary fixation and easy swaying during the hoisting of long steel cages, and to ensure the accuracy of steel cage docking and construction efficiency to a certain extent, this application provides a rapid construction method for bridge piers.

[0005] This application provides a rapid construction method for bridge piers, which employs the following technical solution: A rapid construction method for bridge piers includes the following steps: Construction preparation; For rebar installation, a rebar cage is welded using a roll welding machine. The rebar cage has multiple reinforcing stirrups and at least two layers of guy ropes are installed on it, with a spacing of no less than 6m between adjacent layers. Then, a hoisting device is used to hoist the rebar cage vertically with a double lifting point. The main lifting point is located at the first reinforcing stirrup of the rebar cage, and the secondary lifting point is located at one-third of the distance from the other end of the rebar cage. The guy ropes are used to position and stabilize the rebar cage in the air. Then, the rebar cage is corrected and fixed. The lower end of the guy ropes is anchored by a ground anchor structure to provide counter-tension. After the rebar cage is fixed, the lifting points are removed. Template installation; Concrete pouring; Concrete curing.

[0006] Preferably, the method of using hoisting equipment to perform dual-point coordinated hoisting and vertical rotation of the reinforcing cage includes using hoisting equipment to simultaneously lift the main hoisting point and the auxiliary hoisting point so that the reinforcing cage is parallel to the ground, and then lifting the main hoisting point to vertically rotate the reinforcing cage until the reinforcing cage is vertical.

[0007] Preferably, the guy ropes are provided in two layers, with the upper guy rope located at the position of the first reinforcing stirrup of the steel cage and the lower guy rope located in the middle of the steel cage.

[0008] Preferably, the ground anchor structure includes a prefabricated ground anchor counterweight block, the prefabricated ground anchor counterweight block is provided with a connector for connecting the guy rope, and the prefabricated ground anchor counterweight block has a pre-reserved counterweight compartment for filling counterweights.

[0009] Preferably, the counterweight chamber includes a bottom cavity and a vertical cavity, the bottom cavity being located below the vertical cavity and communicating with the vertical cavity, and the vertical cavity being arranged in a vertical direction.

[0010] Preferably, there are two vertical cavities, which are located at opposite ends of the bottom cavity, and the connector is located between the two vertical cavities.

[0011] Preferably, the prefabricated ground anchor counterweight block has a counterweight hopper slidably mounted on its side wall. The counterweight hopper is used to hold the counterweight, and an anchor rod is mounted on the counterweight hopper to extend into the soil.

[0012] Preferably, the anchor rod is provided with multiple anchor claws, and the distance from the anchor claws to the anchor rod axis increases sequentially from bottom to top.

[0013] Preferably, the prefabricated ground anchor counterweight block is provided with a guide groove, the guide groove is arranged in a vertical direction, the counterweight hopper is provided with a guide rail that slides with the guide groove, and the guide groove passes through the upper end of the prefabricated ground anchor counterweight block so that the guide rail can move in or out.

[0014] Preferably, the construction preparation includes surveying and setting out, foundation treatment, and construction platform erection.

[0015] In summary, this application includes the following beneficial technical effects: During the hoisting of the reinforcing cage, a dual-point collaborative operation is employed. The main hoisting point is located at the first reinforcing stirrup of the reinforcing cage, while the secondary hoisting point is located at one-third of the distance from the other end of the cage. This facilitates better force balance and attitude control during the dynamic process of the reinforcing cage rotating from a horizontal to a vertical position. Combined with at least two layers of guy ropes, with a spacing of at least 6 meters between adjacent guy ropes, the verticality and planar position of the reinforcing cage can be effectively adjusted and maintained with relatively low guy rope tension, enhancing its resistance to lateral interference. For reinforcing cages longer than 12 meters, this approach helps solve the problems of difficult temporary fixation and swaying in the air, ensuring, to a certain extent, the accuracy of the reinforcing cage docking and construction efficiency, and enabling rapid, safe, and precise placement of the reinforcing cage. Attached Figure Description

[0016] Figure 1 This is a construction flowchart of an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the overall structure of the ground anchor structure in the embodiments of this application.

[0018] Figure 3 This is a partial structural cross-sectional view of the ground anchor structure in the embodiments of this application.

[0019] Figure 4 This is a partial structural schematic diagram of the ground anchor structure in an embodiment of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Precast ground anchor counterweight block; 2. Connector; 3. Counterweight chamber; 31. Bottom cavity; 32. Vertical cavity; 4. Counterweight bucket; 5. Anchor bolt; 6. Anchor claw; 7. Guide groove; 8. Guide rail; 9. Sealing block; 10. Inclined surface. Detailed Implementation

[0021] The following combination Figures 1-4 This application will be described in further detail.

[0022] This application discloses a rapid construction method for bridge piers. (Refer to...) Figure 1 The rapid construction method for bridge piers includes the following steps. Step 1: Construction preparation; Step 2: Reinforcing steel installation. The reinforcing steel cage is welded using a roll welding machine. The reinforcing steel cage has multiple reinforcing hoops. At least two layers of guy ropes are installed on the reinforcing steel cage, with a spacing of not less than 6m between adjacent layers of guy ropes. Then, the reinforcing steel cage is lifted and rotated vertically using a double-lifting-point coordinated method. The main lifting point of the double lifting point is set at the first reinforcing hoop of the reinforcing steel cage, and the secondary lifting point is set at one-third of the distance from the other end of the reinforcing steel cage. The guy ropes are used to position and stabilize the reinforcing steel cage in the air. Then, the reinforcing steel cage is corrected and fixed. The lower end of the guy ropes is anchored by a ground anchor structure to provide counter-tension anchoring. After the reinforcing steel cage is fixed, the lifting points are removed. Step 3: Template installation; Step 4: Concrete pouring; Step 5: Concrete curing.

[0023] During the hoisting of the reinforcing cage, the reinforcing stirrups are the main providers of its lateral stiffness, and the first reinforcing stirrup is one of the parts that is firmly welded to the main reinforcement and has good overall integrity. This application sets the main lifting point at the first reinforcing stirrup of the reinforcing cage, which is equivalent to applying the main lifting force directly to the strong and stiff part of the entire reinforcing cage structure. Then, at the beginning of the vertical rotation, the end where the auxiliary lifting point is located is closest to the ground. Setting the auxiliary lifting point at one-third of the distance from the end helps to control the tail trajectory and prevent ground collision. This allows for better force balance and attitude control during the dynamic process of the reinforcing cage rotating from a horizontal to a vertical state. This ensures the stability and reliability of the hoisting process. Simultaneously, at least two layers of guy ropes are used, with the spacing between adjacent guy ropes designed to be greater than or equal to 6 meters. For steel cages longer than 12m, this helps to evenly distribute the constraint force, reduce the slenderness ratio effect, and facilitates effective and precise adjustment and maintenance of the verticality and planar position of the steel cage with relatively small guy rope tension. This enhances its resistance to lateral interference and effectively suppresses swaying in various parts. For hoisting steel cages longer than 12m, this helps solve the problems of difficult temporary fixation and easy swaying in the air, ensuring the accuracy of steel cage docking and construction efficiency to a certain extent, and enabling the rapid, safe, and precise placement of the steel cage.

[0024] Furthermore, the construction preparation includes surveying and setting out, foundation treatment, and construction platform erection. These processes help lay a solid technical and quality foundation for subsequent construction.

[0025] Specifically, in the steel reinforcement installation step, before setting at least two layers of guy ropes on the steel reinforcement cage, the processed steel reinforcement cage is transported to the construction site by a transport vehicle, and the steel reinforcement cage to be used is stacked and stored at the construction site.

[0026] Specifically, the method of using lifting equipment to lift and rotate the reinforcing cage section by means of simultaneously lifting the main and auxiliary lifting points with the lifting equipment so that the reinforcing cage is parallel to the ground, and then lifting the main lifting point to rotate the reinforcing cage vertically until the reinforcing cage is vertical. By simultaneously and evenly separating the entire bottom edge of the cage from the contact surface, sudden impacts or stress concentrations caused by localized initial lifting are avoided, which helps to ensure the stability of the long reinforcing cage during the lifting process.

[0027] Furthermore, the guy ropes are arranged in two layers. The upper layer of guy ropes is located at the first reinforcing stirrup of the reinforcing cage, and the lower layer of guy ropes is located in the middle of the reinforcing cage. Specifically, the upper layer of guy ropes is located at the first reinforcing stirrup of the main lifting point of the reinforcing cage. Placing the upper layer of guy ropes at the first reinforcing stirrup of the main lifting point is equivalent to applying the force used to adjust the position of the top of the reinforcing cage directly to the solid part that is not prone to deformation, thus forming an integrated force-bearing unit in conjunction with the main lifting point. Meanwhile, the lower layer of guy ropes provides a lateral tension in the middle of the reinforcing cage, which helps to improve the stability of the reinforcing cage in conjunction with the upper layer of guy ropes.

[0028] Specifically, there are four guy ropes on each layer, and the four guy ropes on the same layer are evenly spaced along the circumference of the steel cage so that the steel cage can be stabilized in time after installation.

[0029] Reference Figure 2 To facilitate the provision of anti-tension anchor points for the guy ropes, the ground anchor structure includes a precast ground anchor counterweight block 1, which is a precast concrete block. The precast ground anchor counterweight block 1 is provided with a connector 2 for connecting the guy ropes. Specifically, the connector 2 can be a connecting steel ring embedded in the surface of the precast ground anchor counterweight block 1, or a tensioner integrated on the precast ground anchor counterweight block 1. No limitation is made here.

[0030] Reference Figure 2 and Figure 3 Furthermore, the prefabricated ground anchor counterweight block 1 has a pre-reserved counterweight compartment 3, which is used to fill counterweights. The setting of the counterweight compartment 3 allows the counterweights such as sand and soil to be filled into the counterweight compartment 3 as needed on site, so that the prefabricated ground anchor counterweight block 1 can achieve a light load during transportation and a heavy load effect during use, which facilitates the transportation of the prefabricated ground anchor counterweight block 1 and saves manufacturing costs.

[0031] Reference Figure 2 and Figure 3 The counterweight chamber 3 includes a bottom cavity 31 and a vertical cavity 32. The bottom cavity 31 is located below and communicates with the vertical cavity 32. The bottom cavity 31 is arranged horizontally, and the vertical cavity 32 is arranged vertically. Both the bottom cavity 31 and the vertical cavity 32 are holes reserved during the casting process of the precast ground anchor counterweight block 1. The end of the bottom cavity 31 is sealed by a sealing block 9. In order to make the force on the precast ground anchor counterweight block 1 uniform, there are two vertical cavities 32. The two vertical cavities 32 are located at opposite ends of the bottom cavity 31, making the counterweight chamber 3 U-shaped. The connecting piece 2 is located between the two vertical cavities 32, so that the connecting piece 2 is located in the middle of the precast ground anchor counterweight block 1.

[0032] Reference Figure 2 and Figure 3Furthermore, the top wall of the bottom cavity 31 is designed with two inclined surfaces 10, which are located between the two vertical cavities 32. The distance between the two inclined surfaces 10 increases in the direction away from the bottom wall of the bottom cavity 31. By setting the two inclined surfaces 10, when the counterweight in the counterweight chamber 3 needs to be poured out, the prefabricated ground anchor counterweight block 1 is flipped over and the opening of the vertical cavity 32 faces downward. The counterweight in the counterweight chamber 3 can be smoothly poured out along the inclined surfaces 10.

[0033] Reference Figure 2 and Figure 4 The precast ground anchor counterweight block 1 has a counterweight hopper 4 slidably installed on its side wall. Specifically, there are two counterweight hoppers 4 symmetrically distributed along the center line of the precast ground anchor counterweight block 1. The counterweight hopper 4 is used to hold the counterweight. Anchor rods 5 are installed on the counterweight hopper 4 and are used to extend into the soil.

[0034] After placing the prefabricated ground anchor counterweight 1 in the required position, the counterweight bucket 4 is slidably installed on both sides of the prefabricated ground anchor counterweight 1. Under the action of the counterweight bucket 4's own weight, the anchor rod 5 comes into contact with the soil surface. Then, the counterweight bucket 4 is filled with sand, gravel, soil and other on-site counterweights. As the load on the counterweight bucket 4 increases, it drives the anchor rod 5 to gradually insert into the soil. The setting of the anchor rod 5 helps to enhance the pull-out resistance of the prefabricated ground anchor counterweight 1, which is effectively suitable for working conditions with low surface bearing capacity.

[0035] Reference Figure 2 and Figure 4 To facilitate the assembly and disassembly of the counterweight hopper 4 and the prefabricated ground anchor counterweight block 1, a guide groove 7 is provided on the prefabricated ground anchor counterweight block 1. The guide groove 7 is set in the vertical direction, and each counterweight hopper 4 corresponds to two guide grooves 7. A guide rail 8 for sliding engagement with the guide groove 7 is welded and fixed to the side wall of the counterweight hopper 4. The guide groove 7 only penetrates the upper end of the prefabricated ground anchor counterweight block 1 so that the guide rail 8 can move in or out. Furthermore, the cross-section of the guide groove 7 and the guide rail 8 is designed to be either T-shaped or dovetail-shaped, without any restriction, so that the guide rail 8 and the guide groove 7 will not separate after being inserted and engaged.

[0036] When it is necessary to assemble the counterweight bucket 4 onto the prefabricated ground anchor counterweight block 1, align the lower end of the guide rail 8 on the counterweight bucket 4 with the upper end of the corresponding guide groove 7 on the prefabricated ground anchor counterweight block 1. Then, the guide rail 8 slides in the corresponding guide groove 7. On the one hand, this makes it difficult for the counterweight bucket 4 to separate from the prefabricated ground anchor counterweight block 1, and on the other hand, it increases the pull-out resistance of the prefabricated ground anchor counterweight block 1.

[0037] Reference Figure 2Furthermore, the anchor rod 5 is provided with multiple anchor claws 6, which are evenly spaced along the axial and circumferential directions of the anchor rod 5. Specifically, each anchor claw 6 is an inclined rod, and the distance from the anchor claw 6 to the axis of the anchor rod 5 increases sequentially from bottom to top. The length, diameter, and inclination angle of each anchor claw 6 are set according to actual needs. The multiple inclined anchor claws 6 provide low resistance when inserted into the soil but high resistance when removed, thereby further enhancing the overall pull-out resistance of the precast ground anchor counterweight block 1.

[0038] Reference Figure 2 and Figure 3 The arrangement of the two vertical cavities 32 is perpendicular to the arrangement of the two counterweight buckets 4, so that the connection position between the counterweight bucket 4 and the prefabricated ground anchor counterweight block 1 avoids the structural weak position where the prefabricated ground anchor counterweight block 1 has reserved holes, thereby helping to ensure the overall structural strength of the prefabricated ground anchor counterweight block 1.

[0039] The template installation includes assembling the cylindrical pier templates into a circular mold according to the pouring height. The height of the circular mold installed at one time is greater than 1 / 2 of the length of the entire steel cage. Then, the circular mold is ground and rust-removed, and a release agent is applied. Then, the circular mold is hoisted by a double lifting point using hoisting equipment. Wind-resistant ropes are set at the bottom of the circular mold. After the circular mold is lifted and rotated vertically, it is slowly lowered to the support surface. Ground workers operate the wind-resistant ropes to position the circular mold. Then, the lower end of the circular mold is fixed. Then, the upper end of the circular mold is connected and fixed to the main reinforcement of the pier column steel cage with hooks or wires. Then, the lifting points are removed, and the guy ropes that stabilize the steel cage are moved to the corresponding position of the upper end of the circular mold for fixing. Then, they are tightened. At this time, the guy ropes are used to stabilize and adjust the circular mold.

[0040] The concrete pouring process includes transporting concrete to the site using a tanker truck, then using a crane to lift the concrete hopper into the formwork, and simultaneously using an immersion vibrator for compaction.

[0041] The concrete curing process includes using hoisting equipment to attach the upper lifting points of the formwork to be dismantled, stopping immediately after the hoisting steel rope is under tension, then loosening the guy ropes on the ground anchor structure, then dismantling the formwork, and then immediately covering the pier column with a membrane for curing.

[0042] The implementation principle of this application embodiment is as follows: During the hoisting of the reinforcing cage, the main hoisting point is set at the first reinforcing stirrup, which has a strong and rigid structure, and the secondary hoisting point is set at one-third of the distance from the other end. This helps control the tail trajectory and prevents ground collision. During the dynamic process of the reinforcing cage flipping from a horizontal to a vertical state, better force balance and attitude control are achieved, ensuring hoisting stability and reliability. At the same time, with the upper and lower layers of guy ropes, the upper guy rope is set at the first reinforcing stirrup of the reinforcing cage, and the lower guy rope is set in the middle of the reinforcing cage. Through a specially designed ground anchor structure, a stable anti-tension anchoring point can be provided for the guy ropes, achieving the effect of light load during transportation and heavy load during use. This helps to effectively and accurately adjust and maintain the verticality and planar position of the reinforcing cage, enhancing its ability to resist lateral interference. For the hoisting of reinforcing cages longer than 12m, it helps to solve the problems of difficult temporary fixation in the air and easy swaying, and to a certain extent ensures the docking accuracy and construction efficiency of the reinforcing cage, achieving rapid, safe and accurate positioning of the reinforcing cage.

[0043] When using a ground anchor structure, the prefabricated ground anchor counterweight block 1 is placed in the required position. Then, the counterweight chamber 3 is filled with on-site counterweights such as sand and soil. Next, the counterweight bucket 4 is slidably installed on both sides of the prefabricated ground anchor counterweight block 1. Under the weight of the counterweight bucket 4 itself, the anchor rod 5 comes into contact with the soil surface. Then, the counterweight bucket 4 is filled with on-site counterweights such as sand and soil. As the load on the counterweight bucket 4 increases, it drives the anchor rod 5 to gradually insert into the soil, thereby helping to enhance the pull-out resistance of the prefabricated ground anchor counterweight block 1, providing stable and reliable tension for the guy rope, and facilitating the connection of the steel cage.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for rapid construction of a bridge pier column, characterized by, Includes the following steps: Construction preparation; For rebar installation, a rebar cage is welded using a roll welding machine. The rebar cage has multiple reinforcing stirrups and at least two layers of guy ropes are installed on it, with a spacing of no less than 6m between adjacent layers. Then, a hoisting device is used to hoist and rotate the rebar cage vertically with a double lifting point. The main lifting point is located at the first reinforcing stirrup of the rebar cage, and the secondary lifting point is located at one-third of the distance from the other end of the rebar cage. The guy ropes are used to position and stabilize the rebar cage in the air. Then, the rebar cage is corrected and fixed. The lower end of the guy ropes is anchored by a ground anchor structure to provide counter-tension. After the rebar cage is fixed, the lifting points are removed. Template installation; Concrete pouring; Concrete curing.

2. The method according to claim 1, wherein: The method of using hoisting equipment to hoist and rotate the steel cage in a coordinated manner with two lifting points includes using hoisting equipment to lift the main lifting point and the auxiliary lifting point simultaneously so that the steel cage is parallel to the ground, and then lifting the main lifting point to rotate the steel cage vertically until the steel cage is vertical.

3. The method of claim 2, wherein: The guy ropes are arranged in two layers. The upper guy rope is located at the first reinforcing stirrup of the steel cage, and the lower guy rope is located in the middle of the steel cage.

4. The method of claim 1, wherein: The ground anchor structure includes a prefabricated ground anchor counterweight block (1), on which a connector (2) for connecting guy ropes is provided, and a counterweight compartment (3) is reserved inside the prefabricated ground anchor counterweight block (1), which is used to fill counterweights.

5. The method of claim 4, wherein: The counterweight compartment (3) includes a bottom cavity (31) and a vertical cavity (32). The bottom cavity (31) is located below the vertical cavity (32) and communicates with the vertical cavity (32). The vertical cavity (32) is arranged in the vertical direction.

6. The method of claim 5, wherein: Two vertical cavities (32) are provided, and the two vertical cavities (32) are located at opposite ends of the bottom cavity (31). The connector (2) is located between the two vertical cavities (32).

7. The method of claim 4, wherein: The prefabricated ground anchor counterweight block (1) has a counterweight bucket (4) slidably mounted on its side wall. The counterweight bucket (4) is used to hold the counterweight. An anchor rod (5) is mounted on the counterweight bucket (4) and is used to extend into the soil.

8. The method of claim 7, wherein: The anchor rod (5) is provided with multiple anchor claws (6), and the distance from the anchor claws (6) to the axis of the anchor rod (5) increases sequentially from bottom to top.

9. The method of claim 7, wherein: The prefabricated ground anchor counterweight block (1) is provided with a guide groove (7), which is arranged in a vertical direction. The counterweight hopper (4) is provided with a guide rail (8) that slides with the guide groove (7). The guide groove (7) passes through the upper end of the prefabricated ground anchor counterweight block (1) so that the guide rail (8) can move in or out.

10. The method according to any one of claims 1-9, wherein: The construction preparation includes surveying and setting out, foundation treatment, and construction platform erection.

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